JPH0786266B2 - Double roof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a double-roof roof provided with an upper roof material for surface makeup and a lower roof material for waterproofing.

[Conventional technology]

Traditionally in Japan, flat roof tiles made of metal plates, roof tile roofs,
Alternatively, a tiled roof is commonly used. In Europe and America, stone-based roofing materials such as natural slate and simple roofing materials such as western tiles such as tile blocks are also used for roofs. However, in areas with a lot of rain such as Japan, roofs using roofing materials such as stone materials and tile blocks have been considered unsuitable because of their poor rain proofing performance.

However, in recent years, roofing materials have a strong tendency to diversify, and stone materials,
Roofing materials such as tile blocks are required for design reasons.

In order to meet the above-mentioned demands, the inventor has previously disclosed Japanese Patent Laid-Open No. 63-26.
A double-roofed roof shown in Japanese Patent No. 5050 is proposed. As shown in FIG. 12 and FIG. 13, this double-roofed roof is composed of a large number of roofing roof tiles (1) made up of tile blocks and a lower roofing roof (2) made of a waterproof metal plate. ), And the lower roof material (2) is fixed on the roof support member (3) such as a main building material, and the ridges (4) along the eaves direction are formed on the lower roof material (2) in the left-right direction. That is, the engaging holes (4a) formed on the upper surface of these ridges (4) formed at required intervals in the width direction parallel to the purlins.
By engaging the locking claw (5a) of the locking member (5) provided on the upper surface of the ridge (4), the locking member (5) is fixed on the ridge (4). The lower surface of the roofing roofing material (1) is locked to the locking member (5), and the ridge-side edge of the roofing roofing material (1) is attached to the ridge-side edge of the roofing roofing material (1) on the eaves side. The eave side parts are overlapped and laminated from the eave side to the ridge side.

This double-roofed roof does not have sufficient rain warding performance from the overlapping part of the roofing roof material (1) consisting of tile blocks, and even if rainwater or the like enters below these, that is, inside the room, The roof material (2) is guided to the recesses (6) between the ridges (4) and allowed to flow down to these eaves to be discharged from the eaves.

[Problems to be Solved by the Invention]

The conventional double-roofed roof is constructed as described above, and since the engaging hole (4a) is provided on the upper surface of the ridge (4) of the lower roofing material (2), rainwater during storms, etc. There is a case where water travels through the lower surface (rear surface) of the roofing roofing material (1) and enters between the lower surface and the upper portion of the ridge (4), and water may slightly leak from the engaging hole (4) to the indoor side. , Especially in the left-right direction, ie
If both side edges of the lower roofing material (1) adjacent in the width direction parallel to the purlin are connected on the ridge (4), there is a problem that water may leak from the connecting portion to the indoor side. there were. Even if an upper roof material such as a tile block or a natural slate is fastened and fixed on the ridges of the lower roof material with a fixing tool such as a screw, the indoor side from the screw hole where the screw is fitted It is difficult to prevent water leakage.

This invention solves the above-mentioned problems and ensures that even if an upper roofing material such as a tile block or a natural slate that does not have sufficient rain-fighting performance is used, water will leak from the lower roofing material to the interior side. The purpose is to provide a double thatched roof that can be prevented with a relatively simple structure.

[Means for Solving the Problems]

The present invention is a double roof that includes an upper roof material for surface makeup and a waterproof lower roof material that is supported on a roof support member, the left and right side edges of the lower roof material. A rising portion is formed on the portion, and an inner engaging portion and an outer engaging portion that are bent inward and outward from each rising portion are formed, and further,
The inner engaging portion is provided with a concave groove along the eaves direction toward the center in the left-right direction, and among the rising portions that are adjacent in the left-right direction,
While fixing the lower edge outside of the rising portion continuous with the inner engaging portion on the support member, the inner engaging portion and the outer engaging portion are overlapped and engaged, and further, the upper roofing material is Is supported on the outer engaging portion and fixed to the concave groove portion or a portion inside the concave groove by a fixing tool.

[Action]

In the double-roof roof according to the present invention, a roofing material such as a tile block which does not have sufficient rain proof performance is used, and even if rainwater or the like enters under the upper roofing material, that is, inside the roofing material. Most of the water that has entered falls on the recesses between the rising portions provided on both side edges of the lower roofing material as in the conventional ones described above, and flows down to these eaves and is discharged from the eaves.

Also, a small portion of the water that has entered the indoor side is guided between the lower surface of the upper roof material and the upper surface of the outer engaging portion of the lower roof material. Since it extends to the part closer to the center in the left-right direction than the rising part of the lower roofing material, the invading water is guided to the recesses of the adjacent lower roofing materials from both lateral edges of the outer engaging portion. That is, the water is split into one that joins with most of the water described above and is discharged, and one that is guided to the concave groove formed in the inner engaging portion.

Then, since the water guided to the concave groove does not flow over the rising portion of the lower roof material having the concave groove and does not flow out between the rising portions of the both lower roof members, the water is lowered outside the rising portion. Water does not enter the part where the roofing material is fixed.

Therefore, by improving the lower roof material, it is possible to surely prevent water leakage from the lower roof material to the indoor side without taking any special water leakage preventing means.

Moreover, since the present invention does not use the suspension member, the structure is relatively simple.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1, FIG. 2 and FIG. 3 show the first embodiment. First
In FIG. 2 and FIG. 2, (11) is an upper roof material for tiled surfaces made of tile blocks, and (12) is a lower roof material supported on a roof support member (13) described later.

As shown in FIGS. 1 and 2, the lower roof material (12) is made of a bent product of a metal plate such as a coated steel plate, and is in the left-right direction, that is, the width direction parallel to the purlin material (23) described later. Rising edges (14), (15) are formed on both side edges of the, and a recess (16) is formed between them to form an elongated rectangular shape in the eaves direction.

The rising portion (14) of the right edge is bent upward from the recess (16) at a right angle to form an inner engaging portion (17) bent inward in the left-right direction from the upper edge of the rising portion (14). A recessed groove (18) is formed at the center of the joint (17) in the left-right (width) direction along the direction of the eaves. Further, the rising portion (14) and the inner engaging portion (17) are configured by a double stack in which metal plates are in close contact with each other.

Then, as shown in FIG. 3, the upper plate, the lower plate (17a), and (17) of the inner engagement portion (17) closer to the rising portion (14) than the concave groove (18).
A space (19) is formed between b).

Further, the lower edge of the rising portion (14) of the right edge portion is provided with a mounting portion (20) which is bent outward at right angles in the left-right direction.

The rising portion (15) of the left edge portion is bent obliquely outward and upward in the left-right direction from the recess (16), and is bent outward from the upper edge of the rising portion (15) in the left-right direction in parallel with the recess (16). An outer engaging portion (21) is formed, and a cover portion (21a) bent downward at a right angle is continuously provided at an outer edge of the outer engaging portion (21).

In addition, an intermediate support portion (22) for supporting the roofing roof material (11) is projected at one place or a plurality of places having mutual intervals between the rising portions (14) and (15) of both side edge portions. The intermediate support part (22) has a rising part (14) and an engaging part (17) on the right side edge part.
Is configured similarly to.

In order to construct a double thatched roof using the lower roof material (12) configured as described above, the lower roof materials (12), (12) that are adjacent in the left-right direction are replaced by the main roof material (23). And a mounting portion (20) for the left lower thatched roof material (12) supported on the roof support member (13) composed of a base member (24) having a heat insulating function laid on the main building material (23). A fixture consisting of screws (25)
It is fixed on the support member (13) by.

Between the rising part (14) of the left lower roof material (12) and the rising part (15) of the right lower roof material (12), the mounting part (20)
And the fixtures (25) are located, and these are located on the lower right side together with the concave groove (18) which is arranged in the lateral center part from the rising part (14) of the left lower roofing material (12). The outer roof part (12) is covered with an outer engagement part (21), and the outer engagement part (21)
By engaging the inner engaging portion (17) with the inner engaging portion (17), the left and right adjacent lower roofing members (12), (12) are connected to each other in a vertical roof shape.

After that, the roofing roof material (11) made of tile blocks is supported on the outer engaging portion (21) and the intermediate support portion (22), and the fixture (26) of the self-tapping screw is fixed to the roofing roof material (11). ) Through the upper roofing material (11) and the outer engaging portion (21), and tightened and fixed to the bottom of the groove (18) of the inner engaging portion (17).

As shown in Fig. 1, a part of the roofing roof material (11) is piled up in the direction of the eaves and the left-right direction in the same manner as the conventional one, and a large number of thatched roof materials (12) are also used. The ridge-side and eave-side ends of the building are constructed in the same way as the conventional vertical roof.

Since the double-roof roof of the first embodiment is configured as described above, rainwater enters into the lower part of the roofing roof material (11), that is, the interior side, from the overlapping part of the roofing roof material (11) in the event of a storm, but enters. Most of the sewage is the rising part (1) of the underlaying roofing material (12).
It falls on the concave part (16) between 4) and (15), flows down to the eaves side of the concave part (16) due to the roof slope, and is discharged from the eaves tip.

In addition, a small portion of the water that has entered the indoor side is guided between the lower surface of the upper roof material (11) and the upper surface of the outer engaging portion (21) of the lower roof material (12). As for the water guided to, the outer engaging portion (21) provided in the right lower roof material (12) adjacent in the left-right direction from the rising portion (15) to the left lower roof material (12). Since it extends from the rising portion (14) toward the center in the left-right direction thereof, the recesses () of the lower roofing materials (12), (12) adjacent to each other from both lateral edges of the outer engagement portion (21) ( 16) and (16), which joins with most of the water described above and is discharged from the eaves, and a fixture (26) in the groove (18) provided in the inner engagement part (17). And those that flow down along the outer peripheral surface of.

The water flowing down into the groove (18) drops along the outer periphery of the fixture (26) because the fixture (26) is screwed into the bottom of the groove (18) and protrudes downward. Fixtures (26)
Is dripped from the lower end to the recessed part (16) of the lower roofing material (12) on the left and discharged from the eaves.

Even if water collects in the concave groove (18), it will pass over the rising portion (15) of the left lower roofing material (12) to reach the rising portion (15).
This rise on the outside of (15) and the right thatched roofing material (12)
Since it does not flow out between the rising part (14) and the rising part (14), the fitting (25) for fixing the mounting part (20) between the rising parts (14) and (15) to the roof support member (13) is penetrated. Water does not enter the room from the part.

Furthermore, even if water enters between the lower part of the upper roofing material (11) and the upper surface of the outer engaging part (21) from the penetrating portion of the fixture (26) of the upper roofing material (11), Roof material for roofs (11)
Is treated in the same manner as water that has entered from the overlapping portion between the lower surface of the upper roofing material (11) and the upper surface of the outer engaging portion (21).

Further, the rising portion (14) from the concave groove (18) of the inner engaging portion (17)
Since a space (19) is formed between the upper and lower plates (17a) and (17b) on the side, water entering between the upper and lower plates (17a) and (17b) rises due to the capillary phenomenon. (14) It can be surely prevented from being guided to the outside.

Even if the inner engaging portion is entirely in contact with the upper and lower plates without providing the space portion (19), water will hardly leak to the rising portion (14) from between them. Absent.

In the first embodiment, the left and right overlapping parts of one roofing roof material (11) adjacent to each other in the eaves direction are arranged in the center part of the other roofing roof material (11) in the left-right direction to provide a large number of roofs. To make thatched roofing material (11) toward the eaves, use the upper and lower thatched roofing materials (1
Corresponding the left and right dimensions of 1) and (12), as shown in FIG. 4, they are adjacent to the outer eaves portion (21) of the lower roofing roof material (12) adjacent to each other in the horizontal direction in the direction of the eaves. The upper roofing material (11) is only supported alternately, or as shown in FIG. 5, the fixtures (as described above) are attached to the two left and right intermediate supporting portions (22) of the lower roofing material (12). 26) is used to support and fix the upper roofing material (11), and these upper roofing materials (11) are lower roofing materials (1
It is only necessary to support it on the outer engaging portion (21) at the side edge portion of 2).

FIG. 6 shows a first modification of the first embodiment. In this modified example, the rising portion (15) at the left edge of the lower roofing material (12) is bent at a right angle upward from the recess (16). Then, of the lower roofing materials (12), (12) that are adjacent to each other in the left-right direction, the roof support member (13) by the fixture (25) of the mounting portion (20) of the left lower roofing material (12). The fixing part to the right lower roofing material (12) is positioned closer to the center in the left-right direction than the rising portion (15) of the right lowering roofing material (12) and is covered with the recess (16). Outer engagement part (21) Cover part (21
Bend (a) to the side of the diagonally lower rising part (15), and cover (2
1a) so as to hold the protruding edge portion (17a) protruding from the concave groove (18) of the inner engaging portion (17) of the left lower roofing material (12) to the opposite side of the rising portion (14). It is a combination.

FIG. 7 shows a second modification of the first embodiment. In this modified example, an inner engaging portion (17) is formed by bending the right roof edge (12) of the lower roofing material (12) from the rising edge (14) to the lower left in the left-right direction from the upper edge.
Is used to form a groove (18), and the bottom of the groove (18) is located on the same plane as the recess (16) of the lower roofing material (12).

Furthermore, raise the rising wall (17c) of this groove (18),
Further, a projecting edge portion (17b) which is bent at a right angle is projectingly provided on the opposite side (left side in FIG. 7) of the rising portion (14), and further, this is bent downward in an inverted L-shape to make the rising portion. The part (14) and the projecting edge part (17b) are formed in a double layer in which the metal plates are in close contact with each other.

Then, the fixing portion of the attachment portion (20) of the lower roof material (12) on the left side to the roof support member (13) by the fixture (25) is replaced with the concave portion of the lower roof material (12) on the right side ( It is located closer to the center in the left-right direction than the rising part (15) that is bent at a right angle from 16) and is covered with the recessed part (16), and the outer engagement part (21) of the right lower roofing material (12) is A projecting edge portion (17b) of a left lower roofing material (12) is embracingly engaged with a cover portion (21a) continuously provided on an outer edge.

The configurations of the first and second modifications other than those described above are the same as those of the first modification.
This is the same as the embodiment, and the same reference numerals as in FIGS. 1 to 5 in FIGS. 6 and 7 indicate corresponding parts.

FIG. 8 and FIG. 9 show the second embodiment. In the second embodiment, lower roofing materials (12), (12) that are adjacent to each other in the left-right direction are supported and fixed on a roof support member (13), and after connecting in a vertical roof shape,
The upper roofing material (11) is supported and fixed on the outer engaging portions (21) of the lower roofing materials (12) and (12) through a locking member (27).

That is, the locking member (27) includes a ridge-side locking portion (29) that is bent obliquely upward from the ridge-side edge of the support portion (28), and an upward direction from the eave-side edge of the support portion (28). It is a long material made of a bent product such as a painted steel plate that has an eaves side locking part (30) that protrudes the protruding part (30a) and is bent diagonally downward to the side of the eaves. Drain holes (31) are formed at required intervals in the direction.

Left and right sides of the locking member (27) perpendicular to the eaves direction by supporting the support portion (28) on the outer engagement portions (21) and the intermediate support portion (22) of the plurality of lower roofing materials (12). The fixing member (26) such as a self-tapping screw is passed through the support portion (28) and the outer engagement portion (21) from above the support portion (28), and the inner engagement portion (17) is recessed. Tighten and fix it to the bottom of the groove (18). In this state, the drain hole (31) provided in the locking member (27) is separated from the outer engagement portion (21) and the intermediate support portion (22) on the recess (16) of the lower roofing material (12). Place it.

After that, the ridge side and the eaves side projections (32) and (33) protruding from the lower surface of the roofing roof material (11) made of tile blocks are attached to the ridge side of the locking member (27) and the eaves side locking portion (29). ) And (30) are elastically locked to the roofing roof material (11) and the locking member (27).
Fixed to.

The structure of the second embodiment other than that described above is the same as that of the first embodiment, and in FIGS. 8 and 9, the same reference numerals as those in FIGS. 1 to 5 indicate corresponding parts.

Since the double-roof roof of the second embodiment is configured as described above, rainwater enters into the lower part of the roofing roof material (11), that is, the room side, from the overlapping part of the roofing roof material (11) during a storm or the like. Most of the sewage is the rising part (1) of the underlaying roofing material (12).
It falls on the concave part (16) between 4) and (15), flows down to the eaves side of the concave part (16) due to the roof slope, and is discharged from the eaves tip.

Also, of the water that has entered the indoor side, thatched roof material (11)
Most of the water introduced from the bottom surface of the locking member (27) to the support portion (28) of the locking member (27) is discharged from the drainage hole (31) provided at the eave side edge of the locking member (27) to the roofing roof material. It falls into the recess (16) of (12), joins the water that has fallen from the indoor side of the roofing roof material (11) into the recess (16), and is discharged from the eaves.

Then, a small amount of water is introduced from the penetration portion of the fixture (26) of the support portion (28) between the lower surface of the support portion (28) and the upper surface of the outer engagement portion (21) of the lower roof material (12). The water introduced between them is introduced into the recesses (16) of the lower roofing material (12) that are adjacent to each other in the left-right direction, as in the case of the first embodiment described above, and the rising portions (14), ( 15) It is surely prevented from flowing out.

10 and 11 show a modification of the second embodiment. In this modification, the rising portion (14) of the right edge portion of the lower roofing material (12) is an eight-shaped double wall in which the metal plates are not in close contact with each other, and the left edge portion is located slightly above the step. The fact that the rising portion (15) is bent at a substantially right angle upward from the concave portion (16) through the portion (34) and the intermediate support portion (22) is formed into a ridge having a trapezoidal cross section with an open lower surface. 2 Different from the roofing material of the example.

The lower roofing materials (12), (12) that are adjacent to each other in the left-right direction
Of these, the fixing portion of the attachment portion (20) of the left lower roof material (12) to the roof support member (13) by the fixture (25) is the step portion of the right lower roof material (12) ( 34).

Further, the locking member (27) does not have a locking portion on the ridge side, but has an eaves side locking portion (30) that is folded back in a horizontal U-shape upward at the eaves side edge portion, so as to lock the eaves side. Roofing material (11) for the part (30)
The locking groove (35) of is locked from the ridge side, and the locking member (27)
The roofing roof material (11) is supported and fixed on the top.

The structure of this modified example other than that described above is the same as that of the second embodiment, and the same reference numerals as in FIGS. 10 and 11 denote the corresponding parts.

Further, the locking member used in the second embodiment and its modification is not limited to a long member, and the dividing portion is divided into a plurality of portions located on the concave portion of the lower roof material and the intermediate supporting portion. The drainage holes may be eliminated by discharging the rainwater and the like introduced from the divided portion to the support portion.

The double-roofed roof of the present invention is not limited to the configurations of the above-described embodiment and modified example, and the fixture may be arranged inside the groove provided in the engaging portion, or in both the inner and outer engaging portions. A groove is formed, and the groove portions of the lower thatched roof material that are adjacent to each other in the left-right direction are vertically stacked and fitted, or a groove is provided in the outer engagement portion that is a double stack of metal plates. Fix the nuts and bolts, which are fixtures, to the above by welding, welding, etc., and tighten the bolts and nuts from these on the roofing roof material and locking members, or use aluminum extruded products as the lower roofing material. It can be changed appropriately within the scope of the claims, such as using it or using natural slate as the roofing material. Further, the present invention can be used as an outer wall of a building by making the lower roofing material vertical.

〔The invention's effect〕

The present invention is a double roof that includes an upper roof material for surface makeup and a waterproof lower roof material that is supported on a roof support member, the left and right side edges of the lower roof material. A rising portion is formed on the portion, and an inner engaging portion and an outer engaging portion that are bent inward and outward from each rising portion are formed, and further,
The inner engaging portion is provided with a concave groove along the eaves direction toward the center in the left-right direction, and among the rising portions that are adjacent in the left-right direction,
While fixing the lower edge outside of the rising portion continuous with the inner engaging portion on the support member, the inner engaging portion and the outer engaging portion are overlapped and engaged, and further, the upper roofing material is Since it is supported on the outer engaging portion and is fixed to the concave groove portion or a portion inside the concave groove by the fixing tool, the following effects can be obtained.

That is, in the double-roof roof according to the present invention, a roofing material such as a tile block that does not have sufficient rain endurance performance is used, and rainwater at the time of a storm is below the upper roofing material, that is, on the indoor side. Even if it enters, most of the entered water falls on the recesses between the rising parts provided on both side edges of the lower roofing material as in the case of the above-mentioned conventional ones, flows down to these eaves and is discharged from the eaves. It

Also, a small portion of the water that has entered the indoor side is guided between the lower surface of the upper roof material and the upper surface of the outer engaging portion of the lower roof material. Since it extends to the part closer to the center in the left-right direction than the rising part of the lower roofing material, the invading water is guided to the recesses of the adjacent lower roofing materials from both lateral edges of the outer engaging portion. That is, the water is split into one that joins with most of the water described above and is discharged, and one that is guided to the concave groove formed in the inner engaging portion.

Then, since the water guided to the concave groove does not flow over the rising portion of the lower roof material having the concave groove and does not flow out between the rising portions of the both lower roof members, the water is lowered outside the rising portion. Water does not enter the part where the roofing material is fixed.

Therefore, by improving the lower roof material, it is possible to surely prevent water leakage from the lower roof material to the indoor side without taking any special water leakage preventing means. Moreover, since the present invention does not use a suspension member, the structure is relatively simple.

[Brief description of drawings]

FIG. 1 is a partial sectional side view showing a double thatched roof according to a first embodiment of the present invention, FIG. 2 is a partial sectional front view of the same, and FIG. 3 is an enlarged sectional front view of an outer engaging portion thereof. FIG. 5 and FIG. 5 are partial schematic plan views showing a mounting state of different roofing roof materials, and FIGS. 6 and 7 are first and second embodiments of the first embodiment.
FIGS. 8 and 9 are partial cross-sectional explanatory views showing modified examples, respectively, and FIG. 8 and FIG. 9 are partial sectional side views and partial sectional front views showing a double-roof roof according to the second embodiment of the present invention.
The drawing is a partial sectional side view and a partial sectional front view showing a modified example of the second embodiment, and FIGS. 12 and 13 are a partial perspective view and a partial side sectional view showing a conventional double roof. (11) …… Upper roof material (12) …… Lower roof material (13) …… Roof support members (14), (15) …… Rise (16) …… Recess (17) …… Inner Mating part (18) …… Concave groove (19) …… Space part (20) …… Mounting part (21) …… Outer engagement part (22) …… Intermediate support part (23) …… Main building material (24) …… Base material (25) …… Mounting fixture (26) …… Fixing fixture (27) …… Locking member (28) …… Supporting part (29), (30) …… Building side, eaves side locking part (31) …… Drainage holes (32), (33) …… Project side and eaves side projection of roofing roof material (34) …… Step (35) …… Locking groove for roofing roof material

Claims (7)

[Claims] 1. A double thatched roof comprising an upper roof material for surface makeup and a waterproof lower roof material supported on a roof support member, wherein both sides of the lower roof material in the left-right direction. A rising portion is formed at the edge portion, and an inner engaging portion and an outer engaging portion that are bent inward and outward from each rising portion are formed, and further, the inner engaging portion extends along the eaves direction. A groove is provided near the center in the left-right direction, and of the rising parts that are adjacent to each other in the left-right direction, the outer side of the lower edge of the rising part that is continuous with the inner engaging part is fixed on the support member, and the inner engaging part is also formed. Portion and the outer engaging portion are overlapped with each other, and further, the upper roofing material is supported on the outer engaging portion and fixed to the concave groove portion or a portion inside the concave groove by a fixture. A double thatched roof that is characterized by 2. A double thatched roof comprising an upper roof material for surface makeup and a waterproof lower roof material supported on a roof support member, wherein both lateral edges of the lower roof material. A rising portion is formed on the portion, and an inner engaging portion and an outer engaging portion that are bent inward and outward from each rising portion are formed, and the inner engaging portion is formed along the eaves direction. A bottom groove is provided on the roof support member, and the lower edge outside of the rising portion that is continuous with the inner engaging portion is fixed on the roof supporting member among the respective rising portions that are adjacent in the left-right direction, The inner engagement portion and the outer engagement portion are overlapped and engaged with each other, and further, the upper roofing material is supported on the outer engagement portion, and the concave groove of the outer engagement portion is fixed by a fixture. A double-roofed roof characterized in that a roofing roof material is fixed to the upper part of the roof. 3. The double-roof roof according to claim 1, wherein the lower roof material is a bent product of a metal plate in which the inner engaging portions having the concave grooves are closely overlapped with each other. 4. The double-roof roofing material according to claim 3, wherein the lower-roof roofing material has a space between the lower plate and the upper side of the double-layered inner engaging portion on the rising side of the concave groove. . 5. The lower roofing material has a mounting portion bent laterally outside a lower edge of a rising portion connected to the inner engaging portion, and a rising portion connected to the outer engaging portion is slanted upward and outward in the left and right direction. The double-roofed roof according to any one of claims (1) to (4), wherein the mounting portion is supported on and fixed to a roof support portion below an inclined rising portion. 6. The lower roofing material according to claim 1, wherein an intermediate support portion for supporting the upper roofing material is projected between the rising portions of both side edge portions. Thatched roof. 7. The roofing roof material is fixed by being supported on an outer engaging portion of the lower roofing roof material via a locking member arranged between the upper roofing roof material and the lower roofing roof material. The double thatched roof according to any one of items (1) to (6).