JP7819841B2 - Roof structure using sheet roofing materials - Google Patents

Description

The present invention relates to a roof structure of plate-shaped roofing materials installed in multiple stages on the roof of a building with a slope, the plate-shaped roofing material consisting of a plate-shaped main body and a joint plate, the plate-shaped roofing material being arranged so that the side ends of the plate-shaped main body abut in the girder direction, and in the flow direction, the head side of the upper plate-shaped main body is overlapped with the tail side of the lower plate-shaped main body, the joint plate being arranged below the abutting part of the side ends of the plate-shaped main body, the joint plate having a joint fixing part on the head side, the joint plate having a working length positioning protrusion protruding from the upper surface side, the plate-shaped main body having a main body fixing part on the tail side, and the plate-shaped main body having a main body working length positioning reference part, the joint fixing part being positioned above the main body fixing part, and the joint fixing part and the main body fixing part being simultaneously fastened to the roof substrate with a fastening material to form the plate-shaped roofing material as a single unit. The design unit dimensions of the building and the horizontal projection dimension of the working width or working length of the plate-like body are in an integer ratio relationship, and the working width dimension and the horizontal projection dimension of the working length are in an integer ratio relationship. The joint fixing portions are provided on the joint plates at positions for each gradient so that the working length dimension of the plate-like body is the set dimension for each gradient. The set dimension for the working length dimension for each gradient is the horizontal projection dimension of the working length multiplied by the gradient elongation rate of the gradient. When laying in steps, the specified working length for each gradient is determined by abutting and fastening the main body working length positioning reference portion of the plate-like body of the upper tier to the working length positioning protrusion of the joint plate fixed to the plate-like body of the lower tier. Standardized shape roofing materials are then placed on all roof edges, including the ridge, corner ridge, eaves, trident, valley, and offset ridge sections.

Prior art includes the roof structure of Japanese Utility Model Publication No. 8-6907, which relates to an arrangement structure of roof panels made of natural stone, a plate-shaped roofing material.
The proposed structure for arranging roof panels made of natural stone, a plate-shaped roofing material, comprises multiple roof panels placed on the roof surface, joint panels with an L-shaped cross section and a drainage groove on their upper surface, nails for securing the roof panels and joint panels to the roof surface, and double-sided adhesive tape. The roof panels are arranged so that their side ends abut horizontally, and the joint panels are arranged so that their L-shaped rising portions engage with the upper ends of the roof panels on the undersides of the abutting parts of the roof panels. The nails are driven into both upper edges of the roof panels to secure the roof panels and joint panels to the roof surface. The double-sided adhesive tape is attached horizontally along the nails, covering the upper surfaces of the nails, to form a horizontal row on the roof. This horizontal row is arranged in multiple rows from the bottom to the top of the roof surface, with the lower ends of the roof panels and joint panels overlapping with the double-sided adhesive tape of the previous row.

Publication No. 8-6907

Patent Document 1 relates to an arrangement structure for roof panels made of plate-shaped natural stone roofing material, and is composed of multiple roof panels placed on the roof surface, joint panels with L-shaped cross sections and drainage grooves on their upper surfaces, nails for fixing these roof panels and joint panels to the roof surface, and double-sided adhesive tape.The roof panels are arranged so that their side ends abut horizontally, and the joint panels are arranged so that their L-shaped raised parts engage with the upper ends of the roof panels on the undersides of the abutting parts of each roof panel, and the nails are driven into both upper edges of the roof panels to fix the roof panels and joint panels to the roof surface.The double-sided adhesive tape is attached horizontally along the nails so as to cover the upper surfaces of each nail, forming a horizontal row on the roof, and this horizontal row is arranged in multiple rows from the bottom to the top of the roof surface so that the lower ends of the roof panels and joint panels overlap with the double-sided adhesive tape part of the front row.
This configuration prevents rainwater seeping in from the contact points between the roof panels from reaching the roof surface, eliminates the need for three layers of roof panels, thereby reducing the number of roof panels, eliminates the uneven thickness at the three-layered sections of roof panels made of conventional natural stone, seals nail joints with double-sided adhesive tape to improve waterproofing, and prevents roof panels from falling off due to cracks in the roof panels, etc.

However, in the arrangement structure of the natural stone roofing sheet material in Patent Document 1, when laying the roofing material, the specified working length dimension is measured on the roof, the intervals between the measurements are marked, and the butt end of the roofing material is aligned with the marked lines and fastened with fastening material, which poses problems such as time-consuming installation and a tendency for the working length dimension to vary when the roofing material is fastened, resulting in unstable waterproofing performance.

The present invention relates to a roof structure of plate-shaped roofing materials installed in multiple stages on the roof of a sloped building, the plate-shaped roofing material consisting of a plate-shaped main body and a joint plate, the plate-shaped roofing material being arranged so that the side ends of the plate-shaped main body abut in the girder direction, and in the flow direction, the head side of the upper plate-shaped main body is overlapped with the tail side of the lower plate-shaped main body, the joint plate being provided below the abutting part of the side ends of the plate-shaped main body, the joint plate having a joint fixing part on the head side, the joint plate having a working length positioning protrusion protruding from the upper surface side, the plate-shaped main body having a main body fixing part on the tail side, the plate-shaped main body having a main body working length positioning reference part, the joint fixing part being positioned above the main body fixing part, and the joint fixing part and the main body fixing part being fastened to the roof substrate simultaneously with a fastening material to form an integrated plate-shaped roofing material, the building The design unit dimensions of the object and the horizontal projection dimension of the working width or working length of the plate-shaped body are in an integer ratio relationship, and the working width dimension and the horizontal projection dimension of the working length are in an integer ratio relationship. The joint fixing portions are provided on the joint plates at positions for each gradient so that the working length dimension of the plate-shaped body is the set dimension for each gradient. The set dimension for the working length dimension for each gradient is the horizontal projection dimension of the working length multiplied by the gradient elongation rate of the gradient. When laying in steps, the specified working length for each gradient is determined by abutting and fastening the main body working length positioning reference portion of the plate-shaped body of the upper tier against the working length positioning protrusion of the joint plate fixed to the plate-shaped body of the lower tier. This provides a roof structure using plate-shaped roofing materials in which standardized-shape roofing materials are placed at all roof edges, including the ridge, corner ridge, eaves, trident, valley, and ridge offset.

The roof structure of the plate roofing material of the present invention described in claim 1 is a roof structure of plate roofing materials installed in multiple stages on a sloped roof of a building, the plate roofing material comprising a plate-shaped main body and a joint plate, the plate roofing materials are arranged so that the side ends of the plate-shaped main body abut in the girder direction, and in the flow direction, the head side of the plate-shaped main body of the upper stage overlaps the tail side of the plate-shaped main body of the lower stage, the joint plate is provided below the abutting part of the side ends of the plate-shaped main body, the joint plate has a joint fixing part on the head side, the joint plate has a working length positioning protrusion protruding from the upper surface side, the plate-shaped main body has a main body fixing part on the tail side, and the plate-shaped main body has a main body working length positioning reference part, the joint fixing part is positioned above the main body fixing part, and the joint fixing part and the main body fixing part are simultaneously fastened to the roof substrate with a fastening material, thereby forming the plate roof structure. The roof is integrated as a base material, and the design unit dimensions of the building and the horizontal projection dimension of the working width or working length of the plate-like body are in an integer ratio relationship, and the working width dimension and the horizontal projection dimension of the working length are in an integer ratio relationship. The joint fixing parts are provided on the joint plates at positions for each gradient so that the working length dimension of the plate-like body is the set dimension for each gradient. The set dimension for the working length dimension for each gradient is the horizontal projection dimension of the working length multiplied by the gradient elongation rate of the gradient. When laying in steps, the specified working length for each gradient is determined by abutting and fastening the main body working length positioning reference part of the plate-like body of the upper tier against the working length positioning protrusion of the joint plate fixed to the plate-like body of the lower tier. Standardized shape roofing materials are placed on all roof edges, including the ridge, corner ridge, eaves, trident, valley, and ridge offset.

The present invention described in claim 2 is a roof structure using the plate-shaped roofing material described in claim 1, characterized in that the joint plates have linear water-stopping protrusions in the head-to-tail direction, and the joint fixing portion is provided on the head side of the outer flat portion provided outside the water-stopping protrusions.

The present invention as set forth in claim 3 is characterized in that in the roof structure using the plate-shaped roofing material as set forth in claim 2 , the joint fixing portions are provided on the head side on both sides of the outer flat surface portion.

The present invention described in claim 4 is characterized in that, in the roof structure using the plate-shaped roofing material described in claim 2 , the joint plate has a slip-prevention hole on the rear side of the outer flat portion, and when laying in stages, the fixing fastener fixed from the main body fixing portion of the upper stage plate-shaped main body passes through the slip-prevention hole of the lower stage joint plate.

The present invention described in claim 5 is characterized in that, in the roof structure using the plate-shaped roofing material described in claim 1 , the working length positioning protrusion is also used as a joint water return portion provided on the rear side of the joint plate, and the main body working length positioning reference portion is the rear end portion of the plate-shaped main body.

The present invention described in claim 6 is characterized in that, in the roof structure using the plate-shaped roofing material described in claim 2 , the working length positioning protrusion is provided at the head end of the outer flat surface of the joint plate, and the main body working length positioning reference portion is provided at the head end of the plate-shaped main body.

The present invention described in claim 7 is characterized in that, in the roof structure using the plate-shaped roofing material described in claim 6, a main body head-side retainer is provided that extends from the upper end of the working length positioning protrusion provided on the head end of the outer flat portion to the upper surface side of the outer flat portion, and when laying in stages, the head side of the upper stage plate-shaped main body is inserted below the main body head-side retainer.

The present invention described in claim 8 is characterized in that, in the roof structure using the plate-shaped roofing material described in claim 2 , a joint portion overlap notch is provided on the underside of the side end of the plate-shaped main body, the working length positioning protrusion is provided on the outer flat surface of the joint plate, the main body working length positioning reference portion is provided protruding from the underside of the joint portion overlap notch of the plate-shaped main body, and the working length positioning protrusion abuts the main body working length positioning reference portion on the head side of the main body working length positioning reference portion.

The present invention as set forth in claim 9 is characterized in that in the roof structure using the plate-shaped roofing material as set forth in claim 1 , the joint plate is provided with a plurality of joint fixing portions at positions corresponding to each of the slopes.

According to the present invention, in a roof structure of plate-shaped roofing materials to be installed in multiple stages on the roof of a building with a slope, the plate-shaped roofing materials are composed of plate-shaped main bodies and joint plates, the plate-shaped roofing materials are arranged so that the side ends of the plate-shaped main bodies abut in the girder direction, and in the flow direction, the head side of the plate-shaped main body of the upper stage is overlapped with the tail side of the plate-shaped main body of the lower stage, the joint plates are provided below the abutting parts of the side ends of the plate-shaped main bodies, the joint plates have joint fixing parts on the head side, the joint plates have working length positioning protrusions that protrude on the upper surface side, the plate-shaped main bodies have main body fixing parts on the tail side, and the plate-shaped main bodies have main body working length positioning reference parts, the joint fixing parts are positioned above the main body fixing parts, and the joint fixing parts and the main body fixing parts are fastened to the roof substrate simultaneously with fastening materials to form the plate-shaped roofing material. The design unit dimensions of the building and the horizontal projection dimension of the working width dimension or working length of the plate-like body are in an integer ratio relationship, and the working width dimension and the horizontal projection dimension of the working length are in an integer ratio relationship, and the joint fixing portion is provided on the joint plate at a position for each gradient so that the working length dimension of the plate-like body becomes the set dimension for each gradient, and the set dimension for each gradient of the working length dimension is the horizontal projection dimension of the working length multiplied by the gradient elongation rate of the gradient, and when roofing in steps, the specified working length for each gradient is determined by abutting and fastening the main body working length positioning reference portion of the plate-like body of the upper tier against the working length positioning protrusion of the joint plate fixed to the plate-like body of the lower tier, and standardized shape roofing materials can be placed on all roof edges such as the ridge ridge, corner ridge, eaves, trident, valley, and ridge offset.
When laying in stages, the plate-shaped roofing material of the present invention can be installed easily and accurately with the specified working length dimension without having to measure the working length dimension on the roof by abutting and securing the main body working length positioning reference portion of the upper plate-shaped main body against the working length positioning protrusion of the joint plate fixed to the lower plate-shaped main body.
The waterproofing in the flow direction of the plate-shaped roofing material is determined by the overlap dimension in the flow direction, so accurate installation using the specified working length dimension will enable the product to exhibit its inherent waterproofing performance.
In order to accurately carry out construction using the specified working length dimensions using conventional technology, it was necessary to carry out a complicated process of measuring the working length dimensions on the roof without error, marking the measured line with ink in the direction of the beam, and then fastening the work with fastening materials such as screws while aligning them with the markings.
However, in the present invention, the position of the joint fixing part, the distance to the working length positioning protrusion, and the distance between the main body fixing part and the main body working length positioning reference part are incorporated into the product specifications, and by aligning the joint fixing part on top of the main body fixing part, construction can be carried out reliably and easily with the specified working length dimensions without having to perform complicated work processes such as measuring the working length dimensions on the roof, drawing lines, marking out, and positioning the plate-shaped main body relative to the markings.
As a result, the sheet roofing material has improved installation workability and can exhibit stable waterproof performance with little variation.
Furthermore, in the present invention, the joint plate and the plate-shaped body can be attached simultaneously using fastening material, which reduces the effort required to fasten them individually and improves the ease of installation.
In conventional technology, the joint plate was fixed at the tail end of the joint plate, but in this invention, the joint fixing part, which is the fixing point of the joint plate, is located at the head end of the joint plate and is fixed to the roof underlayment with a fastening material, so that even in strong winds such as typhoons, the fixing force from the head end is strong and the joint plate can be fixed to the roof underlayment without being blown away.
Furthermore, because it is possible to standardize the shape of the roofing material to be placed on the roof edge, it is possible to place pre-prepared standardized roofing materials on all roof edges, including the ridge, corner ridge, eaves, trifle, valley, and uneven ridge, without having to process the roofing material on site. By eliminating the need to process the roofing material on site, construction is simplified, the skills of experienced craftsmen are no longer required, and productivity at the construction site is greatly improved.
When the standardized roofing material to be applied to the roof edge is produced by pre-cutting the plate-shaped roofing material, the plate body without any joint plates is cut, making it easier to cut and more workable.
By providing the joint fixing portion on the joint plate for each gradient, the working length dimension can be varied for each gradient without changing the product design of the plate-shaped body, simply by preparing a joint plate with a joint fixing portion at a position for each gradient, so that the horizontal projection dimension of the working length is an integer ratio of the working width dimension.

Product drawing of a plate-shaped body according to an embodiment of the present invention Product drawing of a joint plate according to an embodiment of the present invention 1 is a perspective view of a plate-shaped main body and a joint plate according to an embodiment of the present invention; Roof covering diagram of sheet roofing material according to an embodiment of the present invention A cross-sectional view of the roof framing and 3-inch slope of a sheet roofing material according to an embodiment of the present invention A cross-sectional view of the roof framing and 5-inch slope of a sheet roofing material according to an embodiment of the present invention Product drawing of a joint plate according to another embodiment of the present invention Product drawing of a joint plate according to another embodiment of the present invention 1 is a cross-sectional view of a roofing sheet material according to another embodiment of the present invention; 1 is a cross-sectional view of a roofing sheet material according to another embodiment of the present invention; Product drawing of a plate-shaped body according to another embodiment of the present invention Product drawing of a joint plate according to another embodiment of the present invention 1 is a cross-sectional view of a roofing sheet material according to another embodiment of the present invention; Roofing diagram of a gabled hip roof using sheet roofing materials according to an embodiment of the present invention

The roof structure of the plate roofing material in the first embodiment of the present invention is a roof structure of plate roofing materials installed in multiple stages on the roof of a building with a slope, the plate roofing material consists of a plate-shaped main body and a joint plate, the plate-shaped roofing materials are arranged so that the side ends of the plate-shaped main body abut in the girder direction, and in the flow direction, the head side of the plate-shaped main body of the upper stage is overlapped on the tail side of the plate-shaped main body of the lower stage, the joint plate is provided below the abutting part of the side end of the plate-shaped main body, the joint plate has a joint fixing part on the head side, the joint plate has a working length positioning protrusion protruding on the upper surface side, the plate-shaped main body has a main body fixing part on the tail side, and the plate-shaped main body has a main body working length positioning reference part, the joint fixing part is positioned on the main body fixing part, and the joint fixing part and the main body fixing part are fastened to the roof substrate at the same time with a fastening material, and the joint fixing portions are provided on the joint plates at positions for each gradient so that the working length dimension of the plate-like body is the set dimension for each gradient, and the set dimension for the working length dimension for each gradient is the horizontal projection dimension of the working length multiplied by the gradient elongation rate of the gradient, and when laying in steps, the specified working length for each gradient is determined by abutting and fastening the main body working length positioning reference portion of the plate-like body of the upper tier to the working length positioning protrusion of the joint plate fixed to the plate-like body of the lower tier, and standardized shape roofing materials are placed on all roof edges such as the ridge ridge, corner ridge, eaves, trident, valley, and offset ridge portions.
According to this embodiment, when laying in stages, the working length positioning reference portion of the upper plate-shaped body is abutted against the working length positioning protrusion of the joint plate fixed to the lower plate-shaped body, thereby making it possible to easily and accurately carry out construction with the specified working length dimension without having to measure the working length dimension on the roof.
The waterproofing in the flow direction of the plate-shaped roofing material is determined by the overlap dimension in the flow direction, so accurate installation using the specified working length dimension will enable the product to exhibit its inherent waterproofing performance.
In order to accurately carry out construction using the specified working length dimensions using conventional technology, it was necessary to carry out a complicated process of measuring the working length dimensions on the roof without error, marking the measured line with ink in the direction of the beam, and then fastening the work with fastening materials such as screws while aligning them with the markings.
However, in the present invention, the position of the joint fixing part, the distance to the working length positioning protrusion, and the distance between the main body fixing part and the main body working length positioning reference part are incorporated into the product specifications, and by aligning the joint fixing part on top of the main body fixing part, construction can be carried out reliably and easily with the specified working length dimensions without having to perform complicated work processes such as measuring the working length dimensions on the roof, drawing lines, marking out, and positioning the plate-shaped main body relative to the markings.
As a result, the sheet roofing material has improved installation workability and can exhibit stable waterproof performance with little variation.
Furthermore, in the present invention, the joint plate and the plate-shaped body can be attached simultaneously using fastening material, which reduces the effort required to fasten them individually and improves the ease of installation.
In conventional technology, the joint plate was fixed at the tail end of the joint plate, but in this invention, the joint fixing part, which is the fixing point of the joint plate, is located at the head end of the joint plate and is fixed to the roof underlayment with a fastening material, so that even in strong winds such as typhoons, the fixing force from the head end is strong and the joint plate can be fixed to the roof underlayment without being blown away.
Furthermore, because it is possible to standardize the shape of the roofing material to be placed on the roof edge, it is possible to place pre-prepared standardized roofing materials on all roof edges, including the ridge, corner ridge, eaves, trifle, valley, and uneven ridge, without having to process the roofing material on site. By eliminating the need to process the roofing material on site, construction is simplified, the skills of experienced craftsmen are no longer required, and productivity at the construction site is greatly improved.
When the standardized roofing material to be applied to the roof edge is produced by pre-cutting the plate-shaped roofing material, the plate body without any joint plates is cut, making it easier to cut and more workable.
By providing the joint fixing portion on the joint plate for each gradient, the working length dimension can be varied for each gradient without changing the product design of the plate-shaped body, simply by preparing a joint plate with a joint fixing portion at a position for each gradient, so that the horizontal projection dimension of the working length is an integer ratio of the working width dimension.

The second embodiment of the present invention is a roof structure using a plate-shaped roofing material according to the first embodiment, in which the joint plate has a linear water-stopping convex portion in the head-to-tail direction, and the joint fixing portion is provided on the head side of the outer flat portion provided outside the water-stopping convex portion.
According to this embodiment, when a plate-shaped roofing material is installed on a roof, rainwater that enters through the area where the side ends of the plate-shaped body abut is received by a joint plate positioned below the abutting part of the side ends, and rainwater that spreads in the direction of the beam on the joint plate is stopped by a linear water-stopping protrusion in the head-to-tail direction, thereby preventing rainwater from entering the joint fixing part.

A third embodiment of the present invention is a roof structure using a plate-shaped roofing material according to the second embodiment, in which the joint fixing portions are provided on the head side on both sides of the outer flat surface portion.
According to this embodiment, by providing the joint fixing portion on the head side on both sides of the outer flat surface portion, the joint plate can be fixed parallel to the flow direction of the roof and perpendicular to the girder direction of the plate-like body, so that when the body working length positioning reference portion of the upper plate-like body is abutted and fixed against the working length positioning protrusion of the joint plate fixed to the lower plate-like body, deviation in the parallelism between the lower plate-like body and the upper plate-like body can be suppressed.

In the fourth embodiment of the present invention, in a roof structure using plate-shaped roofing materials according to the second embodiment, the joint plate has a slip-prevention hole at the rear end of the outer flat portion, and when roofing in stages, the fixing fastener fixed from the main body fixing portion of the upper stage plate-shaped main body passes through the slip-prevention hole of the lower stage joint plate.
According to this embodiment, the fixing fastening material that fixes the main body fixing part penetrates the slip-prevention holes provided in the joint plate and is fixed to the roof underlayment material, so that the joint plate does not slip after construction, the deviation in parallelism of the joint plate in the flow direction is suppressed, and the deviation in parallelism of the plate-shaped main body in stepped roofing can be suppressed.

In the fifth embodiment of the present invention, in a roof structure using a plate-shaped roofing material according to the first embodiment, the working length positioning protrusion is also used as a joint water return portion provided on the rear side of the joint plate, and the main body working length positioning reference portion is the rear end portion of the plate-shaped main body.
According to this embodiment, by abutting and fixing the tail end portion against the joint water return portion, construction can be carried out with the specified working length dimension without performing work such as measuring or marking.
Furthermore, during installation, the joint water return portion of the working length positioning protrusion and the tail end of the main body working length positioning reference portion are located in the overlapping portion in the flow direction, so they are not exposed on the surface, resulting in excellent design.
Furthermore, by using the working length positioning protrusion as the joint water return part, it is possible to contribute not only to waterproofing performance but also to construction performance.

The sixth embodiment of the present invention is a roof structure using a plate-shaped roofing material according to the second embodiment, in which the working length positioning protrusion is provided at the head end of the outer flat surface of the joint plate, and the main body working length positioning reference portion is provided at the head end of the plate-shaped main body.
According to this embodiment, the gravity acting on the slope causes the working length positioning protrusion provided at the head end to come into contact with the main body working length positioning reference portion provided at the head end of the plate-shaped main body, making positioning work easier.
In addition, when fixing using the fixing fastener, a certain load is applied to the fixing point due to the gravity acting on the plate-shaped body due to the slope, so it is difficult to slip and can be fixed accurately.

The seventh embodiment of the present invention is a roof structure using a plate-shaped roofing material according to the sixth embodiment, in which a main body head side holding portion is provided extending from the upper end of the working length positioning protrusion provided at the head end of the outer flat portion to the upper surface side of the outer flat portion, and when roofing in stages, the head side of the upper stage plate-shaped main body is inserted below the main body head side holding portion.
According to this embodiment, even if negative pressure is generated on the roof surface due to strong winds such as a typhoon, causing the plate-shaped body to lift up from the head side, the head-side holding portion of the body can be used to press down on the top surface of the head end of the plate-shaped body, thereby preventing the plate-shaped body from lifting up.
This improves wind resistance without scattering roofing materials even during strong winds such as typhoons.

The eighth embodiment of the present invention is a roof structure using a plate-shaped roofing material according to the second embodiment, in which a joint portion overlap notch is provided on the underside of the side end of the plate-shaped main body, the working length positioning protrusion is provided on the outer flat surface of the joint plate, and the main body working length positioning reference portion is provided protruding from the underside of the joint portion overlap notch of the plate-shaped main body, and the working length positioning protrusion abuts the main body working length positioning reference portion on the head side of the main body working length positioning reference portion.
According to this embodiment, the gravity acting on the slope causes the main body working length positioning reference portion protruding from the underside of the joint portion overlapping notch of the plate-shaped main body to come into contact with the working length positioning protrusion provided on the outer flat surface portion, making positioning work easier.
Furthermore, the working length positioning projection is hidden on the underside of the plate-like body, providing excellent design.

In the ninth embodiment of the present invention, in the roof structure using the plate-shaped roofing material according to the first embodiment, the joint plate is provided with a plurality of joint fixing portions at positions corresponding to the gradient.
According to this embodiment, by providing a plurality of joint fixing portions at positions corresponding to different gradients on the joint plate, it is possible to accommodate a plurality of gradients with one type of joint plate.

Hereinafter, a plate-shaped roofing material 1 according to an embodiment of the present invention will be described.
FIG. 1 is a product drawing of a plate-shaped body 3 according to an embodiment.
FIG. 1 is a product drawing of the plate-shaped body 3, which is a six-view projection drawing.
Figure 1 shows a plate-shaped main body 3, one of the components that make up a plate-shaped roofing material 1 to be installed in multiple stages on a roof 2 of a building having a slope 27, and the plate-shaped main body 3 has a main body fixing portion 12 at its tail end 7.
In this embodiment, four main body fixing portions 12 are provided between the first buttocks drainer 15 and the second buttocks drainer 16 .
The working length dimension L is set for each slope 27 so that the horizontal projection dimension Lh of the working length remains constant even if the slope 27 of the roof 2 changes.
Figure 1 shows the working length dimension L1 corresponding to a 3-inch gradient and the working length dimension L2 corresponding to a 5-inch gradient.
The product design module of the product in Figure 1 is a shaku module, and the design unit dimension P of the building is also a shaku module, with 1P = 910 mm.
The horizontal projection dimension Lh of the working length is 227.5 mm of 1/4P, and the working width dimension W is 455 mm of 1/2P.
The overall length dimension LA is 305 mm.
The working length dimension L1 corresponding to a 3-inch gradient is calculated by multiplying the horizontal projection dimension Lh of the working length by the gradient elongation rate of the 3-inch gradient, 1.044.
Similarly, the working length dimension L2 corresponding to a 5-inch gradient is calculated by multiplying the horizontal projection dimension Lh of the working length by the gradient elongation rate of 1.118 for a 5-inch gradient.
In this embodiment, the working length dimension L1 for a 3-inch gradient is 237.5 mm, and the working length dimension L2 for a 5-inch gradient is 254.3 mm.
The distance from the body fixing portion 12 that fixes the plate-shaped body 3 to the tail side 7 of the working length dimension L is the body fixing vertical overlap dimension R, and in this embodiment, the body fixing vertical overlap dimension R1 for a 3-inch gradient is 42.2 mm, and the body fixing vertical overlap dimension R2 for a 5-inch gradient is 25.3 mm.
A head side first drainer 17 and a head side second drainer 18 are provided on the underside 10 of the head side 8.
The first drain at the bottom 15, the second drain at the bottom 16, the first drain at the head 17, and the second drain at the head 18 are intended to prevent rainwater from rising due to capillary action at the vertical overlapping parts of the plate-like body 3 when the roof is laid in stages.
A joint part overlapping notch 31 is provided on the underside 10 of the side end 9 so that the water stopping convex part 22 of the joint plate 4 does not interfere with the underside 10 of the plate-like body 3 when the joint plate 4 is laid together.
In this embodiment, the thickness of the plate-like body 3 is 6 mm, and the height of the joint portion overlapping notch 31 is 1.5 mm.

FIG. 2 is a product drawing of the joint plate 4 according to the embodiment, and is a three-view projection drawing.
Figure 2 shows a joint plate 4, one of the components that make up a plate-shaped roofing material 1 that is installed in multiple stages on a roof 2 of a building with a slope 27.The joint plate 4 has a joint fixing portion 19 on the head side 8, and a working length positioning protrusion 20 that protrudes upward on the tail end 13 of the joint plate 4.
This working length positioning protrusion 20 also serves as a joint water return portion 30 .
The thickness of the joint water return portion 30 is 5.5 mm, which is 0.5 mm less than the thickness of the plate-like main body 3.
The joint plate 4 has a linear water-stopping protrusion 22 in the head-to-tail direction, and the joint fixing portion 19 is provided on the head side 8 of an outer flat portion 23 provided on the outside of the water-stopping protrusion 22.
A slip prevention hole 24 is provided on the rear end 7.
A plurality of joint fixing portions 19 are provided on the head side 8 on both sides of the outer flat surface portion 23 .
In this embodiment, the joint fixing portion 19, the water-stopping convex portion 22, the outer flat portion 23, the anti-slip holes 24, etc. are arranged on both sides of the joint plate 4 in line symmetry with respect to the center thereof.
The joint fixing portion 19 has a horizontally elongated hole shape, and when it is joined to the main body fixing portion 12 of the plate-like main body 3, it can be fixed even if the hole position is slightly misaligned in the horizontal direction.
In this embodiment, three joint fixing portions 19 are provided on one side and six on both sides, so that three types of gradients 27 can be accommodated.
The distance from the center of the joint fixing portion 19 to the working length positioning protrusion 20 is the working length dimension L of the joint plate 4 .
The joint fixing portion 19 on the tail side 8 is used when the slope 27 is a 3-inch slope, and the working length dimension LJ1 corresponding to a 3-inch slope is 262.8 mm.
The working length LJ1 of the joint plate 4 is the total length LA of the plate-like body 3, 305 mm, minus the main body fixing vertical overlap R1, 42.2 mm.
The joint fixing portion 19 on the head side 7 is used when the gradient 27 is a 5-inch gradient, and the working length dimension LJ2 corresponding to a 5-inch gradient is 279.7 mm.
The working length LJ2 of the joint plate 4 is the total length LA of the plate-like body 3, 305 mm, minus the body fixing vertical overlap R2, 25.3 mm.
In an embodiment that serves as both the working length positioning protrusion 20 and the joint water return portion 30, the overall length dimension LAJ of the joint plate 4 is 295 mm, which is 10 mm shorter than the overall length dimension LA of the plate-shaped main body 3, and when the roofing is completed, the head end 14 of the joint plate 4 is set back 10 mm from the head end 14 of the plate-shaped main body 3.
The water-stopping protrusions 22 arranged linearly in the head-to-tail direction are, in the embodiment, water-stopping protrusions 22 integrally molded into a convex shape with a height of 1.4 mm by press molding, but they may also be water-stopping protrusions 22 to which a separate rubber or elastomer water-stopping material is attached.
When a water-stop material made of foamed EPDM rubber is used, it is compressed when the roof is laid and adheres closely to the back surface of the plate-like body 3, resulting in excellent water-stopping properties.
The water-stopping protrusions 22 may also be attached with a hot melt adhesive before or after the press molding process.
The dimension of the flat surface between the water-stopping projections 22 is the joint plate working width WJ, which exhibits the ability to drain rainwater that has entered between the side edges 9 of the plate-like body 3. In this embodiment, it is 54 mm.
A line is stamped into the center of the joint plate working width dimension WJ to serve as a guide when joining the plate-shaped main body 3 together.
The overall width WAJ of the joint plate in this embodiment is 86 mm.

3A and 3B are perspective views of the plate-like body 3 and the joint plate 4 according to the embodiment. FIG. 3A is a perspective view of the plate-like body 3, with the head side 8 at the front and the butt side 7 at the back.
The plate-like body 3 in FIG. 3(a) has the same shape as that in the embodiment in FIG.
FIG. 3(b) is a perspective view of the joint plate 4, with the head side 8 at the front and the tail side 7 at the back.
The joint plate 4 in FIG. 3(b) has the same shape as that in the embodiment in FIG.
The material of the joint plate 4 in this embodiment is assumed to be a hot-dip 55% aluminum-zinc alloy plated steel plate having a thickness of 0.4 mm.

FIG. 4 is a roof plan view of the plate-shaped roofing material 1 according to the embodiment.
FIG. 4( a ) shows the joining of the plate-like main body 3 and the joint plate 4 .
In the girder direction 5, the side end portions 9 of the left and right plate-like bodies 3 are arranged so as to abut against each other.
In the flow direction 6, the head side 8 of the upper plate-like body 3 is placed on the tail side 7 of the lower plate-like body 3.
The joint plate 4 is provided below the abutting portion of the side end portion 9 of the plate-shaped main body 3, and rainwater that seeps in from the abutting portion is received by the joint plate 4 and drained onto the plate-shaped main body 3 below.
The joint fixing part 19 of the joint plate 4 is positioned on the main body fixing part 12 of the plate-like main body 3, and the joint fixing part 19 and the main body fixing part 12 are fastened together to the roof underlayment 26 at the same time with a fastening material 25, and the plate-like main body 3 and the joint plate 4 are integrated as a plate-like roof material 1.
In the embodiment, two of the four main body fixing portions 12 provided on the tail side 7 of the plate-shaped main body 3 are overlapped with two central joint fixing portions 19 provided on both sides of the head side 8 of the outer flat surface 23 of the joint plate 4, and are fastened to the roof underlayment 26 with fixing fastening material 25.
By aligning the center line of the joint plate 4 with the side end of the plate-like body 3 to be installed in the upper row, the plate-like body 3 is staggered in the girder direction 5 by half a plate-like body 3 in the upper and lower rows.
Of the four body fixing portions 12 provided on the tail side 7 of the plate-like body 3, two on both sides have fixing fasteners 25 fixed to the body fixing portions 12, and these fixing fasteners 25 pass through anti-slip holes 24 provided on the tail side 7 of the outer flat portion 23 of the joint plate 4.
The fixing fastening material 25 that fixes the main body fixing part 12 passes through the slippage prevention hole 24 of the joint plate 4, thereby correcting the positional deviation of the joint plate 4 relative to the plate-shaped main body 3, and enabling the plate-shaped roofing material 1 to be accurately fixed to the roof 2.
The working length positioning projection 20 of the joint plate 4 is a joint water return part 30 which is formed by raising the rear end 13 of the joint plate 4, and has both a working length positioning function and a water return function.
When laying in stages, the tail end 13 of the upper plate-like body 3 is brought into contact with and fixed to the working length positioning projection 20 of the joint plate 4 fixed to the lower plate-like body 3.
In this embodiment, the rear end portion 13 of the plate-like main body 3 serves as a main body working length positioning reference portion 21 .
The specified working length dimension L can be determined by abutting and fixing the tail end portion 13 against the joint water return portion 30.
The joint plate 4 has three joint fixing portions 19 on one side and six on both sides, and in FIG. 4, the joint fixing portion 19 provided at the rearmost side 7 is used for fixing with a fixing fastener 25 .
By using the joint fixing portion 19 provided at the tail end 7, the working length dimension L can be determined according to the slope 27 and the plate-shaped roofing material 1 can be fixed.

FIG. 4(b) is a horizontal projection diagram showing the layout dimensions when the plate-like main body 3 and the joint plate 4 are joined together.
The joint plate 4 provided below the abutting portion of the side end portion 9 of the plate-like main body 3 is also shown by a dotted line to illustrate the positional relationship between the plate-like main body 3 and the joint plate 4.
The working width dimension W of the plate-like body 3 in this embodiment is 455 mm, which is half the design unit dimension P of the building, and when the plate-like body 3 is arranged in two rows in the girder direction 5, it becomes 910 mm per P.
The horizontal projection dimension Lh of the working length of the plate-like body 3 is 227.5 mm, which is 1/4 of the design unit dimension P of the building, and the plate-like body 3 is 455 mm, which is 0.5P, in two stages in the flow direction 6.
The design unit dimension P of the building and the working width dimension W of the plate-shaped body 3 have an integer ratio of 2:1, the design unit dimension P of the building and the horizontal projection dimension Lh of the working length of the plate-shaped body 3 have an integer ratio of 4:1, and the working width dimension W and the horizontal projection dimension Lh of the working length have an integer ratio of 2:1.
The roof edge 28 at the right end of the roof 2 represents the eaves portion, and on the first row of the figure, a standardized shaped roof material 29 is placed, which has a working width dimension that is half the working width dimension W of the plate-shaped main body 3 and a working width of 227.5 mm, which is the horizontal projection dimension Lh of the working length.
In both the girder direction 5 and the flow direction 6, the design unit dimension P of the building and the working width dimension W and horizontal projection dimension Lh of the working length of the plate-shaped roof material 1 are in an integer ratio relationship, and by shifting the arrangement in the girder direction by the horizontal projection dimension Lh of the working length, standardized shape roof materials 29 can be arranged at all roof ends 28.

FIG. 5 shows a roof plan of the plate-shaped roofing material 1 according to the embodiment and a cross-sectional view of construction with a 3-inch slope.
FIG. 5( a ) is a roof plan of the plate-shaped roofing material 1 .
The roof edge 28 is a ridge portion, and the plate-shaped roofing materials 1 and the standardized shape roofing materials 29 are arranged alternately in each row on the roof edge 28.
The joint plate 4 has three joint fixing parts 19 on one side and six on both sides, and is fixed with fixing fasteners 25 using the joint fixing part 19 provided at the rear end 7.
By using the joint fixing portion 19 provided at the tail end 7, the plate-shaped roofing material 1 can be placed on the roof 2 with a horizontal projection dimension Lh of the working length of 227.5 mm when the slope is 3 sun.
The cross section designation of the AA cross section is written in the figure, and indicates the cross section location of the AA cross section in the flow direction 6 of FIG. 5(b).

FIG. 5(b) is a cross-sectional view of construction in the flow direction 6 when the gradient 27 is 3 sun gradient.
The working length dimension L in the flow direction 6 is 237.5 mm, and the working length dimension L1 of 237.5 mm for a 3-inch gradient can be calculated by multiplying the horizontal projection dimension Lh of the working length of 227.5 mm by the gradient elongation rate of 1.044 for a 3-inch gradient.
The working length positioning projection 20 of the joint plate 4 is a joint water return portion 30 that is formed by raising the rear end portion 13 of the joint plate 4, and serves both the working length positioning function and the water return function.
By abutting and fixing the tail end 13 of the upper plate-like body 3 to the joint water-repellent part 30 of the joint plate 4 fixed to the roof underlayment 26 with a fixing fastening material 25, it is possible to determine the working length dimension L1 of 237.5 mm corresponding to a 3-inch gradient without measuring the working length dimension L on the roof, and fix the plate-like roof material 1 to the roof 2.

Figure 5(c) is a construction cross-sectional view in the flow direction 6 when the gradient 27 is 3 inches, and is an enlarged construction cross-sectional view of Figure 5(b) to make it easier to see the location where the joint plate 4 and the plate-shaped main body 3 are fixed to the roof underlayment 26 by joint fastening material 25, and the location where the main body working length positioning reference part 21 is positioned by abutting and stopping against the working length positioning protrusion 20.
The working length positioning protrusion 20 is the joint water return portion 30 , and the main body working length positioning reference portion 21 is the tail end portion 13 .

FIG. 6 shows a roof plan of the plate-shaped roofing material 1 according to the embodiment and a cross-sectional view of construction with a 5-inch slope.
FIG. 6( a ) is a roof plan of the plate-shaped roofing material 1 .
The roof edge 28 is a ridge portion, and the plate-shaped roofing materials 1 and the standardized shape roofing materials 29 are arranged alternately in each row on the roof edge 28.
The joint plate 4 has three joint fixing parts 19 on one side and six on both sides, and is fixed with fixing fasteners 25 using the joint fixing part 19 provided closest to the head side 6.
By using the joint fixing part 19 provided at the head end 6, the plate-shaped roofing material 1 can be placed on the roof 2 with a horizontal projection dimension Lh of the working length of 227.5 mm when the slope is 5 sun.
The cross section designation of the AA cross section is written in the figure, and indicates the cross section location of the AA cross section in the flow direction 6 of FIG. 6(b).

FIG. 6(b) is a cross-sectional view of construction in the flow direction 6 when the gradient 27 is 5 sun gradient.
The working length dimension L in the flow direction 6 is 254.3 mm, and by multiplying the horizontal projection dimension Lh of the working length of 227.5 mm by the gradient elongation rate of 1.118 for a 5-inch gradient, the working length dimension L1 of 254.3 mm for a 5-inch gradient can be calculated.
The working length positioning projection 20 of the joint plate 4 is a joint water return portion 30 that is formed by raising the rear end portion 13 of the joint plate 4, and serves both the working length positioning function and the water return function.
By abutting and fixing the tail end 13 of the upper plate-like body 3 to the joint water-repellent part 30 of the joint plate 4 fixed to the roof underlayment 26 with a fixing fastening material 25, it is possible to determine the working length dimension L1 of 254.3 mm corresponding to a 5-inch gradient without measuring the working length dimension L on the roof, and to arrange the plate-like roofing material 1 on the roof 2.

FIG. 7 is a product drawing of a joint plate 4 according to another embodiment.
FIG. 7 is a product drawing of the joint plate 4, which is a three-view projection drawing.
The product shown in Figure 7 is a joint plate 4, one of the components that make up the plate-shaped roofing material 1 to be installed in multiple stages on the roof 2 of a building having a slope 27. The joint plate 4 has a joint fixing portion 19 on the head side 8, and a working length positioning protrusion 20 that protrudes upward from the head end portion 14 of the outer flat surface 23 of the joint plate 4.
In this embodiment, the working length positioning projection 20 has a height of 6 mm and projects perpendicularly from the head end 14 of the outer flat surface 23 .
The thickness of the joint water return portion 30 is 5.5 mm, which is 0.5 mm less than the thickness of the plate-like main body 3.
The joint plate 4 has a linear water-stopping protrusion 22 in the head-to-tail direction, and the joint fixing portion 19 is provided on the head side 8 of an outer flat portion 23 provided on the outside of the water-stopping protrusion 22.
A stopper hole 24 is provided on the rear end 7.
A plurality of joint fixing portions 19 are provided on the head side 8 on both sides of the outer flat surface portion 23 .
In this embodiment, the joint fixing portion 19, the water-stopping convex portion 22, the outer flat portion 23, the anti-slip holes 24, etc. are arranged on both sides of the joint plate 4 in line symmetry with respect to the center thereof.
The joint fixing portion 19 has a horizontally elongated hole shape, and when it is joined to the main body fixing portion 12 of the plate-like main body 3, it can be fixed even if the hole position is slightly misaligned in the horizontal direction.
In this embodiment, three joint fixing portions 19 are provided on one side and six on both sides, so that three types of gradients 27 can be accommodated.
The distance from the center of the joint fixing portion 19 to the working length positioning protrusion 20 is the main body fixing vertical overlap dimension.
The joint fixing portion 19 on the tail side 8 is used when the gradient 27 is a 3-inch gradient, and the main body fixing vertical overlap dimension R1 corresponding to a 3-inch gradient is 42.2 mm.
This is the same dimension as the vertical overlap dimension R1 of the plate-shaped main body 3 when the gradient is 3 inches.
The joint fixing portion 19 on the head side 7 is used when the gradient 27 is a 5-inch gradient, and the main body fixing vertical overlap dimension R2 corresponding to a 5-inch gradient is 25.3 mm.
This is the same dimension as the vertical overlap dimension R2 of the plate-shaped body 3 when the gradient is 5 inches.
In an embodiment in which the working length positioning protrusion 20 is provided at the head end 14 of the outer flat portion 23, the overall length dimension LAJ of the joint plate 4 is 315 mm, which is 10 mm longer than the overall length dimension LA of the plate-shaped main body 3, and when the joint plates are laid together, the joint water-repellent portion 30 of the joint plate 4 is positioned 10 mm away from the butt end 13 of the plate-shaped main body 3.
The water-stopping protrusions 22 arranged linearly in the head-to-tail direction are press-molded to form convex water-repellents 1.4 mm high in the embodiment, but rubber or elastomer water-stopping materials may also be attached.
A water-stop material such as foamed EPDM rubber is compressed when the roof is laid and adheres closely to the back surface of the plate-like body 3, so that it has excellent water-stopping properties.

FIG. 8 is a product drawing of a joint plate 4 according to another embodiment.
FIG. 8 is a product drawing of the joint plate 4, which is a three-view projection drawing.
The product in Figure 8 is a joint plate 4, a single component that constitutes a plate-shaped roofing material 1 to be installed in multiple stages on the roof 2 of a building having a slope 27, and the joint plate 4 has a joint fixing portion 19 on the head side 8, a working length positioning protrusion 20 that protrudes upward at the head end portion 14 of the outer flat surface 23 of the joint plate 4, and a main body head holding portion 32 that extends from the upper end of the working length positioning protrusion 20 to the upper surface side of the outer flat surface 23.
In this embodiment, the working length positioning projection 20 has a height of 6.6 mm and projects perpendicularly from the head end 14 of the outer flat surface 23 .
The main body head pressing portion 32 extends from the upper end of the working length positioning protrusion 20 to the upper surface side of the outer flat surface portion 23 at an angle that is approximately parallel to the outer flat surface portion 23.
When laying in stages, the head side 8 of the upper plate-like body 3 is inserted below the body head side holding part 32, so it is easier to insert the plate-like body 3 if the body head holding part 32 is slightly wider, but if it is wider than this, the force holding the head end part 14 of the plate-like body 3 will be weakened.
The thickness of the joint water return portion 30 is 5.5 mm, which is 0.5 mm less than the thickness of the plate-like main body 3.
The joint plate 4 has a linear water-stopping protrusion 22 in the head-to-tail direction, and the joint fixing portion 19 is provided on the head side 8 of an outer flat portion 23 provided on the outside of the water-stopping protrusion 22.
A slip prevention hole 24 is provided on the rear end 7.
A plurality of joint fixing portions 19 are provided on the head side 8 on both sides of the outer flat surface portion 23 .
In this embodiment, the joint fixing portion 19, the water-stopping convex portion 22, the outer flat portion 23, the anti-slip holes 24, etc. are arranged on both sides of the joint plate 4 in line symmetry with respect to the center thereof.
The joint fixing portion 19 has a horizontally elongated hole shape, and when it is joined to the main body fixing portion 12 of the plate-like main body 3, it can be fixed even if the hole position is slightly misaligned in the horizontal direction.
In this embodiment, three joint fixing portions 19 are provided on one side and six on both sides, so that three types of gradients 27 can be accommodated.
The distance from the center of the joint fixing portion 19 to the working length positioning protrusion 20 is the main body fixing vertical overlap dimension.
The joint fixing portion 19 on the tail side 8 is used when the gradient 27 is a 3-inch gradient, and the main body fixing vertical overlap dimension R1 corresponding to a 3-inch gradient is 42.2 mm.
This is the same dimension as the vertical overlap dimension R1 of the plate-shaped main body 3 when the gradient is 3 inches.
The joint fixing portion 19 on the head side 7 is used when the gradient 27 is a 5-inch gradient, and the main body fixing vertical overlap dimension R2 corresponding to a 5-inch gradient is 25.3 mm.
This is the same dimension as the vertical overlap dimension R2 of the plate-shaped body 3 when the gradient is 5 inches.
In an embodiment in which the working length positioning protrusion 20 is provided at the head end 14 of the outer flat portion 23, the overall length dimension LAJ of the joint plate 4 is 315 mm, which is 10 mm longer than the overall length dimension LA of the plate-shaped main body 3, and when the joint plates are laid together, the joint water-repellent portion 30 of the joint plate 4 is positioned 10 mm away from the butt end 13 of the plate-shaped main body 3.
The water-stopping protrusions 22 arranged linearly in the head-to-tail direction are press-molded to form convex water-repellents 1.4 mm high in the embodiment, but rubber or elastomer water-stopping materials may also be attached.
A water-stop material such as foamed EPDM rubber is compressed when the roof is laid and adheres closely to the back surface of the plate-like body 3, so that it has excellent water-stopping properties.

FIG. 9 shows a roof installation diagram and a cross-sectional view of a sheet roofing material according to another embodiment.
FIG. 9( a ) is a roof plan of the plate-shaped roofing material 1 .
The roof edge 28 is a ridge portion, and the plate-shaped roofing materials 1 and the standardized shape roofing materials 29 are arranged alternately in each row on the roof edge 28.
The joint plate 4 has three joint fixing parts 19 on one side and six on both sides, and is fixed with fixing fasteners 25 using the joint fixing part 19 provided at the rear end 7.
By using the joint fixing portion 19 provided at the tail end 7, the plate-shaped roofing material 1 can be arranged with a horizontal projection dimension Lh of the working length of 227.5 mm when the slope is 3 sun.
The working length positioning projections 20 of the joint plate 4 are provided on the head end portions 14 of the outer flat portions 23 on both sides of the joint plate 4 and extend vertically from the head end portions 14 .
The main body working length positioning reference portion 21 is the head end portion 14 of the plate-shaped main body 3.
The joint fixing portions 19 of the joint plate 4 are placed on the two main body fixing portions 12 provided in the center of the plate-like main body 3, and are fixed together to the roof underlayment 26 with fixing fasteners 25.
The working length positioning projections 20 of the joint plate 4 attached to the center of the plate-like body 3 abut and stop both sides of the head end portion 14 of the upper plate-like body 3 to be covered with staggered roofing, thereby accurately positioning the plate-like body 3.
The overall length dimension LAJ of the joint plate is longer than the overall length dimension LA of the plate-like body 3, and when the plate-like body 3 is positioned by abutting and fixing the body working length positioning reference part 21 against the working length positioning protrusion 20, a gap is formed between the tail end part 13 of the plate-like body 3 and the joint water return part 30.
The cross section designation of the AA cross section is written in the figure, and indicates the cross section location of the AA cross section in the flow direction 6 of FIG. 9(b).

FIG. 9(b) is a cross-sectional view of construction in the flow direction 6 when the gradient 27 is 3 sun gradient.
The working length positioning projections 20 of the joint plate 4 are provided on the head end portions 14 of the outer flat portions 23 on both sides of the joint plate 4 and extend vertically from the head end portions 14 .
The main body working length positioning reference portion 21 is the head end portion 14 of the plate-shaped main body 3.
The joint fixing portions 19 of the joint plate 4 are placed on the two main body fixing portions 12 provided in the center of the plate-like main body 3, and are fixed together to the roof underlayment 26 with fixing fasteners 25.
By abutting and fastening the head end 14 of the upper plate-like body 3 against the working length positioning protrusions 20 that are raised vertically to the head end 14 of the outer flat portion 23 on both sides of the joint plate 4 fixed to the roof underlayment 26 with fixing fasteners 25, it is possible to determine the working length dimension L1 corresponding to a 3-inch gradient and fix the plate-like roof material 1 to the roof 2 without measuring the working length dimension L on the roof.
The main body working length positioning reference portion 21 is the head end portion 14 of the plate-shaped main body 3.
When the plate-like body 3 is arranged with the body working length positioning reference part 21 abutting and stopping the working length positioning protrusion 20, a gap is formed between the tail end part 13 of the plate-like body 3 and the joint water return part 30.

FIG. 9(c) is a construction cross-sectional view in the flow direction 6 when the gradient 27 is 3 inches, and is an enlarged construction cross-sectional view of a main part of FIG. 9(b).
The joint fixing portion 19 of the joint plate 4 and the main body fixing portion 12 of the plate-shaped main body 3 are fixed to the roof underlayment 26 by joint fastening material 25, and the head end portion 14, which is the main body working length positioning reference portion 21, is positioned by abutting and stopping against the working length positioning protrusion 20.
The slope 27 causes gravity to act on the plate-shaped main body 3 toward the eaves, which has the advantage of making it easier to abut and secure the head end 14 of the plate-shaped main body 3 against the working length positioning protrusion 20 provided on the head end 14 of the outer flat surface 23 of the joint plate 4.
Furthermore, since a certain load is applied to the plate-shaped main body 3 by gravity during the fixing operation using the fixing binding material 25, there is also the advantage that the plate-shaped main body 3 is less likely to come off.
However, since the working length positioning projection 20 provided on the joint plate 4 is exposed to the outside of the plate-like body 3, there is also a disadvantage in terms of appearance.

FIG. 10 shows a roof installation diagram and a cross-sectional view of a sheet roofing material according to another embodiment.
FIG. 10( a ) is a roof plan of the plate-shaped roofing material 1 .
The roof edge 28 is a ridge portion, and the plate-shaped roofing materials 1 and the standardized shape roofing materials 29 are arranged alternately in each row on the roof edge 28.
The joint plate 4 has three joint fixing parts 19 on one side and six on both sides, and is fixed with fixing fasteners 25 using the joint fixing part 19 provided at the rear end 7.
By using the joint fixing portion 19 provided at the tail end 7, the plate-shaped roofing material 1 can be arranged with a horizontal projection dimension Lh of the working length of 227.5 mm when the slope is 3 sun.
The working length positioning projections 20 of the joint plate 4 are provided on the head end portions 14 of the outer flat portions 23 on both sides of the joint plate 4 and extend vertically from the head end portions 14 of the outer flat portions 23 .
A main body head side pressing portion 32 is provided extending from the upper end of the working length positioning protrusion 20 to the upper surface side of the outer flat surface portion 23 .
When laying in stages, the head side 8 of the upper plate-shaped body 3 is inserted below the head side holding portion 32 of the body, and the working length dimension L is determined by the abutment of the head end portion 14 of the plate-shaped body 3 and the working length positioning protrusion 20 of the joint plate 4.
The main body working length positioning reference portion 21 is the head end portion 14 of the plate-shaped main body 3.
The joint fixing portions 19 of the joint plate 4 are placed on the two main body fixing portions 12 provided in the center of the plate-like main body 3, and are fixed together to the roof underlayment 26 with fixing fasteners 25.
The working length positioning projections 20 of the joint plate 4 attached to the center of the plate-like body 3 abut and stop both sides of the head end portion 14 of the upper plate-like body 3 to be covered with staggered roofing, thereby accurately positioning the plate-like body 3.
The overall length dimension LAJ of the joint plate is longer than the overall length dimension LA of the plate-like body 3, and when the body working length positioning reference part 21 is brought into contact with the working length positioning protrusion 20 and the plate-like body 3 is positioned, a gap is formed between the tail end part 13 of the plate-like body 3 and the joint water return part 30.
The cross section designation of the AA cross section is written in the figure, and indicates the cross section location of the AA cross section in the flow direction 6 of FIG. 10(b).

FIG. 10(b) is a cross-sectional view of construction in the flow direction 6 when the gradient 27 is 3 sun gradient.
The working length positioning projections 20 of the joint plate 4 are provided on the head end portions 14 of the outer flat portions 23 on both sides of the joint plate 4 and extend vertically from the head end portions 14 of the outer flat portions 23 .
A main body head side pressing portion 32 is provided extending from the upper end of the working length positioning protrusion 20 to the upper surface side of the outer flat surface portion 23 .
When laying in stages, the head side 8 of the upper plate-shaped body 3 is inserted below the head side holding portion 32 of the body, and the working length dimension L is determined by the abutment of the head end portion 14 of the plate-shaped body 3 and the working length positioning protrusion 20 of the joint plate 4.
The main body working length positioning reference portion 21 is the head end portion 14 of the plate-shaped main body 3.
The joint fixing portions 19 of the joint plate 4 are placed on the two main body fixing portions 12 provided in the center of the plate-like main body 3, and are fixed together to the roof underlayment 26 with fixing fasteners 25.
By abutting and fastening the head end 14 of the upper plate-like body 3 against the working length positioning protrusions 20 that are raised vertically to the head end 14 of the outer flat portion 23 on both sides of the joint plate 4 fixed to the roof underlayment 26 with fixing fasteners 25, the working length dimension L1 corresponding to a 3-inch gradient can be determined without measuring the working length dimension L on the roof, and the plate-like roof material 1 can be fixed to the roof 2.
When the plate-like body 3 is positioned by abutting and fixing the body working length positioning reference part 21 against the working length positioning protrusion 20, a gap is formed between the tail end part 13 of the plate-like body 3 and the joint water return part 30 of the joint plate 4, since the total length dimension LAJ of the joint plate is longer than the total length dimension LA of the plate-like body 3.

FIG. 10(c) is a construction cross-sectional view in the flow direction 6 when the gradient 27 is 3 inches, and is an enlarged construction cross-sectional view of a main part of FIG. 10(b).
The joint fixing portion 19 of the joint plate 4 and the main body fixing portion 12 of the plate-shaped main body 3 are fixed to the roof underlayment 26 by joint fastening material 25, and the head end portion 14, which is the main body working length positioning reference portion 21, is positioned by abutting and stopping against the working length positioning protrusion 20.
The joint plate 4 has a joint fixing portion 19 on the head side 8, a working length positioning protrusion 20 protruding upward from the head end portion 14 of the outer flat surface 23 of the joint plate 4, and a main body head holding portion 32 extending from the upper end of the working length positioning protrusion 20 to the upper surface side of the outer flat surface 23.
The main body head pressing portion 32 extending from the upper end of the working length positioning protrusion 20 to the upper surface side of the outer flat surface portion 23 extends at an obtuse angle slightly upward from parallel to the outer flat surface portion 23 .
When laying in stages, the head side 8 of the upper plate-like body 3 is inserted below the body head side holding part 32, so it is easier to insert the plate-like body 3 if the body head holding part 32 is slightly upward and widened.
However, if it is spread too much, there is a disadvantage that the force pressing down on the head end 14 of the plate-like body 3 is weakened.
The slope 27 causes gravity to act on the plate-shaped main body 3 toward the eaves, which has the advantage of making it easier to abut and secure the head end 14 of the plate-shaped main body 3 against the working length positioning protrusion 20 provided on the head end 14 of the outer flat surface 23 of the joint plate 4.
Furthermore, since a certain load is applied to the plate-shaped main body 3 by gravity during the fixing operation using the fixing binding material 25, there is also the advantage that the plate-shaped main body 3 is less likely to come off.
However, since the working length positioning projection 20 provided on the joint plate 4 is exposed to the outside of the plate-like body 3, there is also a disadvantage in terms of appearance.

FIG. 11 is a product drawing of a plate-like body 3 according to another embodiment, and is a six-view projection drawing.
The product in FIG. 11 is basically the same as the product in FIG. 1, except that a main body working length positioning reference portion 21 is provided on the underside 10 of the plate-like main body 3.
Therefore, the embodiment of the product shown in FIG. 1 will be omitted, and only the location of the body working length positioning reference portion 21 provided on the lower surface 10 of the plate-like body 3 will be described.
The main body working length positioning reference portion 21 is provided on the underside 10 of the joint portion overlapping notch 31 of the plate-shaped main body 3.
In this embodiment, the lower surface 10 of the joint overlapping notch 31 is at a level cut out 1.5 mm from the lower surface of the plate-like body 3 .
The main body working length positioning reference portion 21 protrudes from the joint portion overlapping notch 31 to the level of the underside of the plate-like main body 3, and the protruding head side 8 serves as the main body working length positioning reference portion 21.
In this embodiment, the main body working length positioning reference portion 21 is provided at a position 210 mm from the center of the main body fixing portion 12.

FIG. 12 is a product drawing of a joint plate 4 according to another embodiment, and is a three-view projection drawing.
The product in Figure 12 is a joint plate 4, a single component that constitutes a plate-shaped roofing material 1 to be installed in multiple stages on the roof 2 of a building having a slope 27. The joint plate 4 has a joint fixing portion 19 on the head side 8, and a working length positioning protrusion 20 that protrudes upward on the outer flat surface 23 of the joint plate 4.
In this embodiment, the working length positioning projection 20 has a height of 1.4 mm and is provided at the side edge of the outer flat surface portion 23 and at a position 210 mm from the center of the anti-slip hole 24 .
The joint plate 4 has a linear water-stopping protrusion 22 in the head-to-tail direction, and the joint fixing portion 19 is provided on the head side 8 of an outer flat portion 23 provided on the outside of the water-stopping protrusion 22.
A plurality of joint fixing portions 19 are provided on the head side 8 on both sides of the outer flat surface portion 23 .
In this embodiment, the joint fixing portion 19, the water-stopping convex portion 22, the outer flat portion 23, the anti-slip holes 24, etc. are arranged on both sides of the joint plate 4 in line symmetry with respect to the center thereof.
The joint fixing portion 19 has a horizontally elongated hole shape, and when it is joined to the main body fixing portion 12 of the plate-like main body 3, it can be fixed even if the hole position is slightly misaligned in the horizontal direction.
In this embodiment, three joint fixing portions 19 are provided on one side and six on both sides, so that three types of gradients 27 can be accommodated.
In this embodiment, the overall length LAJ of the joint plate 4 is 305 mm, which is the same as the overall length LA of the plate-like body 3 .
Since the head end 14 of the joint plate 4 is positioned 10 mm back from the head end 14 of the plate-like body 3 when the roofing is completed, the joint water return part 30 of the joint plate 4 is positioned 10 mm away from the tail end 13 of the plate-like body 3.
The water-stopping protrusions 22 arranged linearly in the head-to-tail direction are press-molded to form convex water-repellents 1.4 mm high in the embodiment, but rubber or elastomer water-stopping materials may also be attached.
A water-stop material such as foamed EPDM rubber is compressed when the roof is laid and adheres closely to the back surface of the plate-like body 3, so that it has excellent water-stopping properties.

FIG. 13 shows a roof installation diagram and a cross-sectional view of a sheet roofing material according to another embodiment.
FIG. 13( a ) is a roof plan of the plate-shaped roofing material 1 .
The roof edge 28 is a ridge portion, and the plate-shaped roofing materials 1 and the standardized shape roofing materials 29 are arranged alternately in each row on the roof edge 28.
The joint plate 4 has three joint fixing parts 19 on one side and six on both sides, and is fixed with fixing fasteners 25 using the joint fixing part 19 provided at the rear end 7.
By using the joint fixing portion 19 provided at the tail end 7, the plate-shaped roofing material 1 can be arranged with a horizontal projection dimension Lh of the working length of 227.5 mm when the slope is 3 sun.
The outer flat surface 23 of the joint plate 4 is provided with a working length positioning protrusion 20 that protrudes upward.
When laying in stages, the working length positioning protrusion 20 of the joint plate 4 is abutted against the main body working length positioning reference portion 21 provided on the underside 10 of the upper plate-shaped main body 3, thereby determining the working length dimension L.
The shape of the plate-like body 3 having the body working length positioning reference portion 21 on the lower surface 10 of the plate-like body 3 is the plate-like body 3 shown in FIG.
The joint fixing portions 19 of the joint plate 4 are placed on the two main body fixing portions 12 provided in the center of the plate-like main body 3, and are fixed together to the roof underlayment 26 with fixing fasteners 25.
Since the head end 14 of the joint plate 4 is positioned 10 mm back from the head end 14 of the plate-like body 3 when the roofing is completed, the joint water return part 30 of the joint plate 4 is positioned 10 mm away from the tail end 13 of the plate-like body 3.
The cross section indication of the AA cross section is written in the figure, and indicates the cross section location of the AA cross section in the flow direction 6 of FIG. 13(b).

FIG. 13(b) is a cross-sectional view of construction in the flow direction 6 when the gradient 27 is 3 sun gradient.
The working length positioning projections 20 of the joint plate 4 are provided at the center end of the outer flat surface portions 23 on both sides of the joint plate 4.
When laying in stages, the working length positioning protrusion 20 of the joint plate 4 abuts the main body working length positioning reference portion 21 provided on the underside 10 of the upper plate-shaped main body 3 at the head side 8, and the working length dimension L is determined.
The shape of the plate-like body 3 having the body working length positioning reference portion 21 on the lower surface 10 of the plate-like body 3 is the plate-like body 3 shown in FIG.
The main body working length positioning reference portion 21 is provided on the underside 10 of the joint portion overlapping notch 31 of the plate-shaped main body 3.
The joint fixing portion 19 of the joint plate 4 is laid on the main body fixing portion 12 of the plate-like main body 3, and they are fixed together to the roof substrate 26 with a fixing fastening material 25.
Since the head end 14 of the joint plate 4 is positioned 10 mm back from the head end 14 of the plate-like body 3 when the roofing is completed, the joint water return part 30 of the joint plate 4 is positioned 10 mm away from the tail end 13 of the plate-like body 3.

FIG. 13(c) is a construction cross-sectional view in the flow direction 6 when the gradient 27 is 3 inches, and is an enlarged construction cross-sectional view of a main part of FIG. 13(b).
When laying in stages, the working length positioning protrusion 20 of the joint plate 4 abuts the main body working length positioning reference portion 21 provided on the underside 10 of the upper plate-shaped main body 3 at the head side 8, and the working length dimension L is determined.
The joint fixing portion 19 of the joint plate 4 is laid on the main body fixing portion 12 of the plate-like main body 3, and they are fixed together to the roof substrate 26 with a fixing fastening material 25.
When the working length positioning protrusion 20 provided on the outer flat surface 23 of the joint plate 4 abuts the main body working length positioning reference portion 21 provided on the underside 10 of the plate-like main body 3 at the head side 8, the slope 27 causes gravity to be applied to the plate-like main body 3 toward the eaves end, which has the advantage of making positioning easier.
Furthermore, since a certain load is applied to the plate-shaped main body 3 by gravity during the fixing operation using the fixing binding material 25, there is also the advantage that the plate-shaped main body 3 is less likely to come off.

FIG. 14 is a roof plan of a gabled hip roof using sheet roofing materials according to the embodiment.
The roof 2 is a staggered roof having five roof surfaces, and has an L-shaped roof shape in horizontal projection.
The design unit dimension P is a shaku module, and 1P is 910 mm.
The eaves projection 33 is 455 mm and the gable projection 34 is also 455 mm, which is 0.5P when expressed in design unit dimension P.
The working width dimension W of the plate-shaped roofing material 1 is 455 mm, and the horizontal projection dimension Lh of the working length is 227.5 mm, which are 0.5P and 0.25P when expressed in terms of the design unit dimension P.
The roof 2 has many roof edges 28, including two ridge portions 35, four corner portions 36, left and right eaves 37, and one valley portion 39.
It also has a trifurcated portion 38 at the roof end 28 where the land ridge portion 35 and two corner ridge portions 36 intersect, and a hipped ridge portion 40 at the roof end 28 where the land ridge portion 35, corner ridge portion 36 and valley portion 39 intersect.
The uneven ridge portion has standardized shape roofing materials 29 of different shapes for gable roofs and hip roofs.
The ridge offset portion in this embodiment is a hip ridge offset portion 40 .
The standardized roofing material 29 arranged in the land ridge portion 35 is a land ridge standardized roofing material 43, and has a shape in which the vertical overlapping portion of the tail end 7 of the plate-like main body 3 is cut off.
All land-ridge portions 35 use land-ridge standardized shape roofing materials 43 of the same shape.
The standardized roofing materials 29 placed at the corner ridge portions 36 are the right corner ridge standardized roofing material 41 and the left corner ridge standardized roofing material 42, and are shaped by cutting the plate-shaped main body 3 to match the angles of the left and right corner ridge portions 36.
A right-corner ridge standardized roofing material 41 of the same shape is used for the right-side corner ridge portion 36, and a left-corner ridge standardized roofing material 42 of the same shape is used for the left-side corner ridge portion 36.
The standardized roofing material 29 arranged on the eaves 37 is a plate-shaped roofing material 1 using a plate-shaped main body 3 and a half roof tile 50 formed by cutting the plate-shaped main body 3 in half.
In this embodiment, the plate-shaped roofing materials 1 are used in a staggered pattern, so that the plate-shaped roofing materials 1 and half roof tiles 50 are used alternately in each row as the standardized shape roofing materials 29 in the eaves portion 37.
Half roof tiles 50 and plate-shaped roofing materials 1 of the same shape are used for all of the eaves portions 37.
The standardized shaped roof materials 29 placed in the three-pronged portion 38 are a three-pronged standardized shaped roof material 44 used for triangular shaped roof surfaces, and a land corner right standardized shaped roof material 48 and a land corner left standardized shaped roof material 49 used for roof surfaces having a land ridge portion 35.
The land corner right standardized shape roof material 48 and the land corner left standardized shape roof material 49 have shapes in which the vertical overlapping portions of the tail end 7 of the corner ridge right standardized shape roof material 41 and the corner ridge left standardized shape roof material 42 are cut off.
The three-pronged standardized roofing material 44 has an isosceles triangular shape formed by combining the diagonally cut portions of the land corner right standardized roofing material 48 and the land corner left standardized roofing material 49 .
All three-pronged sections 38 use the same three-pronged standardized roofing material 44, land corner right standardized roofing material 48, and land corner left standardized roofing material 49.
The standardized shaped roof materials 29 placed in the valley portion 39 are the valley right standardized shaped roof material 45 and the valley left standardized shaped roof material 46, and are shaped by cutting the plate-shaped body 3 on the left and right sides to match the angle of the valley portion 39.
When viewed from the eaves side, a valley-right standardized roofing material 45 is used on the side located to the left of the valley portion 39, and a valley-left standardized roofing material 46 is used on the side located to the right.
The same shaped valley right standardized roofing material 45 and valley left standardized roofing material 46 are used for all the valley portions 39.
The standardized roof material 29 arranged at the hipped ridge staggered portion 40 is a right-side standardized hipped ridge staggered roof material 47 in an embodiment in which the corner ridge is on the right side when viewed from the eaves side.
The shape of the standardized hip roof material 47 is obtained by cutting the plate-like body 3 to match the angle of the corner ridge portion 36, and the portion facing the land ridge portion 35 is formed by cutting the vertical overlap portion of the butt end 7 of the plate-like body 3.
The apparent portion looks similar to the plate-shaped roofing material 1 and the land-ridge standardized shape roofing material 43, but the actual shape is different from the other standardized shape roofing materials 29 in that the part facing the corner ridge portion 36 has a vertical overlapping portion.
As in the embodiment, the same shape of standardized hip roof material 47 is used for all hip roof misalignment sections 40 that have a corner ridge section 36 on the right side.

In the present invention, the design unit dimension P of a building is in shaku modules in the embodiment, but the design unit dimension P of a building can be in meter modules or inch modules.
Furthermore, the material of the plate-shaped main body 3 of the plate-shaped roofing material 1 is not limited to ceramic materials such as tiles, but various materials can be used, such as cement materials, metal materials, resin materials, and wood materials.
The material of the joint plate 4 is not limited to metal, and various other materials can be used.
In the embodiment, the working width dimension W is 455 mm and the horizontal projection dimension Lh of the working length is 227.5 mm, but as long as the design unit dimension P of the building and the working width dimension W or the horizontal projection dimension Lh of the working length of the plate-shaped body 3 are in an integer ratio relationship, and the working width dimension W and the horizontal projection dimension Lh of the working length are in an integer ratio relationship, various dimensions can be used.
The method of arranging the plate-shaped roofing material 1 and the standardized shape roofing material 29 in the embodiment is merely an example, and various arrangement methods can be used within the scope of the configuration of the present invention.

1 Plate-shaped roofing material 2 Roof 3 Plate-shaped body 4 Joint plate 5 Girder direction 6 Flow direction 7 Bottom side 8 Head side 9 Side end 10 Underside 11 Top surface 12 Body fixing portion 13 Bottom end 14 Head end 15 Bottom first flashing 16 Bottom second flashing 17 Head first flashing 18 Head second flashing 19 Joint fixing portion 20 Working length positioning protrusion 21 Body working length positioning reference portion 22 Water-stopping convex portion 23 Outer flat portion 24 Anti-slip hole 25 Fixing fastening material 26 Roof underlay 27 Slope 28 Roof end 29 Standardized shape roofing material 30 Joint water return portion 31 Joint portion overlap notch 32 Body head side upper surface holding portion 33 Eaves overhang 34 Gable overhang 35 Ridge portion 36 Corner ridge portion 37 Eave portion 38 Tri-forked portion 39 Valley portion 40 Hip ridge difference part 41, right corner ridge standardized shape roof material 42, left corner ridge standardized shape roof material 43, land ridge standardized shape roof material 44, triangular standardized shape roof material 45, right valley standardized shape roof material 46, left valley standardized shape roof material 47, right hip ridge difference standardized shape roof material 48, right land corner standardized shape roof material 49, left land corner standardized shape roof material 50, half tile Lh, horizontal projection dimension L of working length, working length dimension L1, working length dimension (compatible with 3-inch slope)
L2 Working length dimension (compatible with 5-inch gradient)
LA Overall length dimension W Working width dimension LJ1 Joint plate working length dimension (compatible with 3-inch gradient)
LJ2 joint plate working length dimension (compatible with 5-inch gradient)
LAJ Joint plate overall length dimension WJ Joint plate working width dimension WAJ Joint plate overall width dimension R1 Main body fixed vertical overlap dimension (compatible with 3-inch gradient)
R2 Main body fixed vertical overlap dimension (compatible with 5-inch gradient)
P Design unit size

Claims (9)

In a roof structure of plate-shaped roofing materials installed in multiple stages on a sloped roof of a building,
The plate-shaped roofing material comprises a plate-shaped main body and a joint plate,
The plate-shaped roofing material is arranged so that the side end of the plate-shaped body abuts in the girder direction,
In the flow direction, the head side of the upper plate-like body is arranged to overlap the tail side of the lower plate-like body,
the joint plate is provided below the abutting portion of the side end portion of the plate-like body,
The joint plate has a joint fixing portion on the head side,
The joint plate has a working length positioning protrusion protruding from the upper surface side,
The plate-like main body has a main body fixing portion on the rear side,
The plate-shaped main body has a main body working length positioning reference portion,
The roofing material is then secured to the roofing base by fastening the joint fixing portion to the roofing base.
The design unit dimensions of the building and the horizontal projection dimensions of the working width dimension or working length of the plate-like body are in an integer ratio relationship, and the horizontal projection dimensions of the working width dimension and the working length are in an integer ratio relationship,
The joint fixing portion is provided on the joint plate at a position corresponding to each gradient so that the working length dimension of the plate-like body becomes a set dimension for each gradient,
The set dimension for each gradient of the working length dimension is a dimension obtained by multiplying the horizontal projection dimension of the working length by the gradient extension rate of the gradient,
When laying in stages, the specified working length for each gradient is determined by abutting and fixing the body working length positioning reference portion of the plate-like body of the upper stage to the working length positioning protrusion of the joint plate fixed to the plate-like body of the lower stage,
A roof structure using sheet roofing materials is characterized by the placement of standardized shaped roofing materials at all roof edges, such as the ridge, corner ridge, eaves, trifle, valley, and ridge offset. A roof structure using plate-shaped roofing materials as described in claim 1, characterized in that the joint plate has a linear water-stopping convex portion in the head-to-tail direction, and the joint fixing portion is located on the head side of the outer flat portion located outside the water-stopping convex portion. 3. The roof structure of plate-shaped roofing material according to claim 2 , wherein the joint fixing portions are provided on the head side of both sides of the outer flat surface portion. The roof structure using plate-shaped roofing materials as described in claim 2, characterized in that the joint plate has a slip- prevention hole on the rear side of the outer flat portion, and the fixing fastener fixed from the main body fixing portion of the upper plate-shaped main body when roofing in stages passes through the slip-prevention hole of the lower joint plate. The roof structure in the plate-shaped roofing material described in claim 1, characterized in that the working length positioning protrusion also serves as a joint water return portion provided on the rear side of the joint plate, and the main body working length positioning reference portion is the rear end portion of the plate-shaped main body. A roof structure in a plate-shaped roofing material as described in claim 2, characterized in that the working length positioning protrusion is provided at the head end of the outer flat surface of the joint plate, and the main body working length positioning reference portion is provided at the head end of the plate-shaped main body. A roof structure using plate-shaped roofing materials as described in claim 6, characterized in that a main body head side retainer is provided extending from the upper end of the working length positioning protrusion provided on the head end of the outer flat surface portion toward the upper surface of the outer flat surface portion, and when laying in stages, the head side of the upper stage plate-shaped main body is inserted below the main body head side retainer. A roof structure in a plate-shaped roofing material as described in claim 2, characterized in that a joint portion overlapping notch is provided on the underside of the side end of the plate-shaped main body, the working length positioning protrusion is provided on the outer flat surface of the joint plate, the main body working length positioning reference portion is provided protruding from the underside of the joint portion overlapping notch of the plate-shaped main body, and the working length positioning protrusion abuts the main body working length positioning reference portion on the head side of the main body working length positioning reference portion. 2. A roof structure using plate-shaped roofing materials according to claim 1 , wherein the joint plate is provided with a plurality of joint fixing portions at positions corresponding to the respective gradients.