JP7623673B2 - Eaves ventilation material - Google Patents

Description

The present invention relates to a soffit ventilation material for ventilating the attic of a building.

Conventionally, eaves ventilators have been installed under the eaves of wooden houses and the like to expel moisture and hot air from the attics. Known examples of such eaves ventilators include an upper panel (upper panel portion) with multiple ventilation openings (ventilation holes), a lower panel (lower panel portion) facing the upper panel and with ventilation slits, and a sloped panel (connecting panel portion) that connects the upper panel and the lower panel and defines a groove-shaped insertion portion between a part of the upper panel and a part of the lower panel into which the end of the eaves ventilator can be inserted (see Patent Document 1).

JP 2019-100052 A

However, in the eaves soffit ventilation material described in Patent Document 1, a portion of the lower panel that defines a portion of the insertion section is formed horizontally and parallel to the upper panel. For this reason, when rain or other water seeps in between the portion of the lower panel and the eaves soffit material inserted into the insertion section due to strong winds or the like, the water can seep in through the small opening at the end of the eaves soffit material or flow around the end to the back side (top side) of the eaves soffit material.

The object of the present invention is to provide an eaves soffit ventilation material that can prevent water that has entered between the eaves soffit material and the lower board from seeping in through the small opening at the end of the eaves soffit material or from going around the end and penetrating to the back side of the eaves soffit material.

The eaves ventilation material of the present invention is an eaves ventilation material comprising an upper plate portion, a lower plate portion opposite the upper plate portion, and a connecting plate portion connecting the upper plate portion and the lower plate portion, wherein a groove-shaped insertion portion into which an end of the eaves material can be inserted is formed between the upper plate portion and the lower plate portion, and a part of the insertion portion is defined by the lower plate portion and the connecting plate portion, and the part defining the insertion portion of the lower plate portion is composed of a horizontal portion extending horizontally from the connection position with the lower end of the connecting plate portion toward the insertion portion side, and an inclined portion that slopes upward from the end of the horizontal portion on the insertion portion side as it approaches the end of the lower plate portion on the insertion portion side, and the horizontal portion is continuous with the portion extending horizontally toward the insertion portion side, and extends horizontally from the connecting position to the opposite side of the insertion portion .

As a result, the part that defines the insertion section of the lower board is composed of a horizontal section and an inclined section, so even if rain or other water seeps in between the eaves soffit material and the inclined section due to strong winds, the water is more likely to flow along the inclined section to the horizontal section. This makes it more difficult for water to flow to the end (edge) of the eaves soffit material. This makes it possible to prevent water from seeping in through the edge of the eaves soffit material or from going around the edge to seep in to the back side of the eaves soffit material.

In the present invention, it is preferable that the connecting plate portion has an inclined surface that slopes upward from the connecting position with the lower plate portion toward the insertion portion. This ensures that a space is formed between the connecting plate portion and the end of the eaves ceiling material when the eaves ceiling material is inserted from the end into the insertion portion, and more reliably prevents water absorption from the edge of the eaves ceiling material.

In the present invention , the upper plate portion has a ventilation portion that extends from the connection position with the upper end of the connecting plate portion to the outside of the end of the horizontal portion opposite the insertion portion in the extending direction of the horizontal portion, and has a ventilation hole formed therethrough in the thickness direction, the ventilation portion faces the horizontal portion across a ventilation space, and further includes a hanging portion that extends downward from the lower surface of the upper plate portion and faces the connecting plate portion across the ventilation space, and it is preferable that a ventilation hole leading to the ventilation space is formed between the lower end of the hanging portion and the end of the horizontal portion opposite the insertion portion. As a result, water such as rain will enter the ventilation space through the ventilation hole and then enter through the ventilation hole. This makes it difficult for water to enter the ventilation hole.

In addition, in the present invention, it is preferable to further include a thermal expansion material disposed in the ventilation space. This makes it possible to prevent flames from entering the attic through the ventilation space and the ventilation hole in the event of a fire.

In addition, in the present invention, it is preferable that the ventilation hole is arranged at a position overlapping the horizontal portion in the vertical direction, and the thermal expansion material is arranged on the horizontal portion so as to face the ventilation hole. This makes it possible to cover the ventilation hole with the thermal expansion material, and it becomes possible to further suppress the flame from entering the attic through the ventilation hole.

In addition, in the present invention, it is preferable that the ventilation section has a sloped portion extending diagonally downward, and the ventilation hole is formed on the sloped portion. As a result, even if water such as rain enters the ventilation hole from the outside due to strong winds, the entered water slides down along the sloped portion. This makes it possible to prevent water from penetrating to the back side of the eaves material. Also, by forming the ventilation hole on the sloped portion, the opening width of the ventilation hole can be increased along the slope, thereby increasing the opening area.

According to the eaves soffit ventilation material of the present invention, the portion defining the insertion portion of the lower board portion is composed of a horizontal portion and an inclined portion, so even if water such as rain enters between the eaves soffit material and the inclined portion due to strong winds, the water is more likely to flow along the inclined portion to the horizontal portion. This makes it difficult for water to flow to the end of the eaves soffit material. This makes it possible to prevent water from seeping in through the edge of the eaves soffit material or going around the edge to the back side of the eaves soffit material (attic).

FIG. 2 is a side view of an eaves ventilation material according to one embodiment of the present invention. FIG. 2 is a top view of the eaves ventilation material shown in FIG. 1 . FIG. 2 is a bottom view of the eaves ventilation material shown in FIG. 1 . FIG. 2 is an explanatory diagram showing the state in which the eaves ventilation material shown in FIG. 1 is installed under the eaves. FIG. 1A is a diagram showing the state in which the eaves ventilation material has been temporarily fixed under the eaves, and FIG. 1B is a diagram showing the state in which the eaves ventilation material has been permanently fixed under the eaves.

Below, we will explain the eaves ventilation material according to one embodiment of the present invention with reference to Figures 1 to 3.

The eaves ventilation material 1 is installed under the eaves to expel moisture and hot air from the attic of a wooden house or the like, and as shown in FIG. 1, includes an upper plate portion 2, a lower plate portion 3 arranged opposite the upper plate portion 2, a connecting plate portion 4 connecting the upper plate portion 2 and the lower plate portion 3, an insertion portion 5, a hanging portion 6, an inclined plate portion 7, and a thermal expansion material 8. These components 2 to 6 define a ventilation space S within the eaves ventilation material 1.

In this embodiment, the eaves ventilation material 1 is made of galvalume steel sheet (hot-dip 55% aluminum-zinc alloy plated steel sheet), but may be made of other metals or synthetic resins, and is not particularly limited. In the following description, the left-right direction shown in Figure 1 is the width direction A (extension direction), the horizontal direction perpendicular to the width direction A is the longitudinal direction B, and the direction perpendicular to the width direction A and the longitudinal direction B is the up-down direction C. Also, Figures 2 to 5 are shown reflecting directions A to C.

In this embodiment, the eaves ventilation material 1 is composed of an upper plate material 1a located on the upper side and a lower plate material 1b located below the upper plate material 1a, as shown in FIG. 1. The upper plate material 1a is composed of a thin plate that is long in the longitudinal direction B and is subjected to bending and punching processing, and the lower plate material 1b is also composed of a thin plate that is long in the longitudinal direction B and is subjected to bending processing. The upper plate material 1a and the lower plate material 1b have the same length in the longitudinal direction B. Then, the upper plate material 1a and the lower plate material 1b are connected at their right ends by attaching a connecting tape 10 from the upper surface of the right end of the upper plate material 1a to the lower surface of the right end of the lower plate material 1b. The tape 10 may be provided over the entire length of the right end of each plate material 1a, 1b, or one or more pieces shorter than the entire length of the right end of each plate material 1a, 1b may be provided in the longitudinal direction B. The length of the tape 10 in the width direction A may be longer than the length that reaches the center of both sides of the fixing part 21 described later. In this way, the eaves ventilation material 1 is formed long in the longitudinal direction B, and the lengths of the components 2 to 7 in the longitudinal direction B are the same. In addition, the upper plate material 1a constitutes most of the upper plate portion 2 (the upper part of the fixing portion 21, the ventilation portion 22), the hanging portion 6, and the inclined plate portion 7, while the lower plate material 1b constitutes part of the upper plate portion 2 (the lower part of the fixing portion 21), the connecting plate portion 4, and the lower plate portion 3.

As shown in Figs. 1 and 2, the upper plate portion 2 has a long plate shape along the longitudinal direction B. The upper plate portion 2 has a fixing portion 21 for fixing the eaves ventilation material 1 under the eaves and a ventilation portion 22. As shown in Fig. 1, the fixing portion 21 is located to the right of the center of the upper plate portion 2 in the width direction A and extends in the width direction A. The fixing portion 21 is also configured by stacking a horizontal portion on the right end side of the upper plate material 1a and a horizontal portion on the right end side of the lower plate material 1b one above the other. The upper end of the connecting plate portion 4 is connected to the left end of the fixing portion 21 (the portion formed by the lower plate material 1b). In other words, the fixing portion 21 extends horizontally from the upper end of the connecting plate portion 4 to the insertion portion 5 side (right side). The fixing portion 21 also has a curved portion 21a that is curved so as to be convex upward. The curved portion 21a is where screws or nails are screwed or hammered in when fixing the eaves ventilation material 1. In addition, the portion of the upper plate material 1a that corresponds to the curved portion 21a and the portion of the lower plate material 1b that corresponds to the curved portion 21a are configured to be able to fit together, and can also be used to align the upper plate material 1a and the lower plate material 1b.

As shown in FIG. 1, the ventilation section 22 has a sloped section 23, a rising section 24, and an upper horizontal section 25. The sloped section 23 extends diagonally downward to the left perpendicular to the longitudinal direction B from the upper surface (left end) of the fixed section 21. As shown in FIG. 2, the sloped section 23 has a plurality of ventilation holes 23a penetrating in the thickness direction. The plurality of ventilation holes 23a are arranged at predetermined intervals along the longitudinal direction B. The ventilation holes 23a have a rectangular planar shape elongated in the width direction A, and are formed by punching the upper plate material 1a. Since the ventilation holes 23a are thus through holes punched out of the slope of the sloped section 23, rainwater can be prevented from accumulating in the ventilation holes 23a more than when the ventilation holes 23a are bridge holes.

As shown in FIG. 1, the multiple ventilation holes 23a are formed in the middle of the sloped portion 23, i.e., in the center, in the width direction A, and are arranged at a position that overlaps with the lower horizontal portion 31 (described later) of the lower plate portion 2 along the vertical direction C. As shown in FIG. 2, the sloped portion 23 is formed with multiple drainage holes 23b penetrating in the thickness direction. These drainage holes 23a have a smaller opening area than the ventilation holes 23a and have a circular planar shape. As shown in FIG. 1, the drainage holes 23b are arranged in the lower part of the sloped portion 23, and are arranged at a position that overlaps with the lower part of the ventilation holes 23a in the width direction A. The number of drainage holes 23b is smaller than the ventilation holes 23a, and they are arranged at a pitch greater than the arrangement pitch of the ventilation holes 23a in the longitudinal direction B. In this embodiment, the arrangement pitch of the drainage holes 23b is set so that, for example, when the siding is arranged at a pitch of 455 mm in the longitudinal direction B, the drainage holes 23b can be arranged to face the siding in the vertical direction C. This makes it possible to arrange the drainage holes 23b to face the siding in the vertical direction C.

As shown in FIG. 1, the rising portion 24 is formed by extending vertically upward from the left end, which is the lower end of the inclined portion 23. The rising portion 24 may be formed by extending obliquely upward from the inclined portion 23. In this way, the ventilation portion 22 has a recess 26 that is defined by the inclined portion 23 and the rising portion 24 and opens upward. The upper horizontal portion 25 is formed by extending horizontally to the left from the upper end of the rising portion 24. In addition, the left end of the upper horizontal portion 25 is disposed outside (to the left) the left end of the lower plate portion 3 in the width direction A. In other words, the upper plate portion 2 has a ventilation portion 22 that extends from the end of the fixed portion 21 (the connection position connected to the upper end of the connecting plate portion 4 of the upper plate portion 2) outside the left end of the lower plate portion 3 in the width direction A. The upper surface of the fixed portion 21 and the upper surface of the upper horizontal portion 25 are disposed at the same height level in the vertical direction C. The upper horizontal portion 25 is the portion into which screws or nails are screwed or hammered when temporarily fixing the upper plate material 1a of the eaves ventilating material 1.

As shown in FIG. 1, the upper end of the connecting plate 4 is connected to the upper plate 2, and the lower end is connected to the lower plate 3, and extends diagonally downward to the left from the left end of the fixing part 21 (the part formed by the lower plate 1b). In other words, the connecting plate 4 is composed of an inclined part that extends in a direction perpendicular to the longitudinal direction B and inclined to the width direction A. Since the connecting plate 4 has an inclined surface that inclines upward from the connection position with the lower plate 3 toward the insertion part 5, a space can be reliably formed between the connecting plate 4 and the end of the eaves soffit material 106 when the eaves soffit material 106 described below is inserted from the end into the insertion part 5, and water absorption from the small edge of the eaves soffit material 106 can be more reliably prevented.

The connecting plate portion 4 extends along the longitudinal direction B, and has the same length in the longitudinal direction B as the upper plate portion 2. The connecting plate portion 4 is disposed below the inclined surface portion 23, facing the inclined surface portion 23 in the vertical direction C. The connecting plate portion 4 is inclined so that the angle θ1 between the connecting plate portion 4 and the fixed portion 21 is smaller than the angle θ2 between the fixed portion 21 and the inclined surface portion 23. As shown in FIG. 1, a space S1 having an acute angle in cross section is defined between the connecting plate portion 4 and the inclined surface portion 23, which is the right side portion of the ventilation space S.

As shown in Figs. 1 and 3, the lower plate portion 3 has a long plate shape along the longitudinal direction B. As shown in Fig. 1, the lower plate portion 3 faces the recessed portion 26 in the vertical direction C with the ventilation space S sandwiched therebetween. The lower plate portion 3 also has a horizontal lower horizontal portion 31 that faces the inclined portion 23 with the ventilation space S sandwiched therebetween, and a gripping portion 32. The lower horizontal portion 31 extends horizontally in the width direction A, and the lower end of the connecting plate portion 4 is connected to the center portion in the width direction A. The left side portion of the lower horizontal portion 31 from the connecting position where the connecting plate portion 4 is connected is composed of the portion of the lower plate material 1b that is folded back and overlapped in a U-shape. On the other hand, the right side portion of the lower horizontal portion 31 from the connecting position where the connecting plate portion 4 is connected is composed of the portion of the lower plate material 1b that extends horizontally. Thus, the lower horizontal section 31 has a portion that extends horizontally to the right from the connection position where it is connected to the lower end of the connecting plate section 4, and a portion that extends horizontally to the left.

As shown in FIG. 1, the holding portion 32 is an inclined portion that inclines upward from the right end of the lower horizontal portion 31 toward the right end of the lower plate portion 3 (the end on the side of the insertion portion 5). The right end of the holding portion 32 has a portion where the lower plate material 1b constituting the holding portion 32 is folded back in a U-shape and overlapped. The insertion portion 5 is defined by the holding portion 32 of the lower plate portion 3 and a part of the lower horizontal portion 31 (the right side portion from the connecting position where the connecting plate portion 4 of the lower horizontal portion 31 is connected), the connecting plate portion 4, and a part of the upper plate portion 2 (fixing portion 21). The insertion portion 5 is formed long along the longitudinal direction B, and is formed in a groove shape into which the end of the eaves material 50 described later can be inserted. In other words, an open insertion port 5a for inserting the end of the eaves material 50 is formed at one end of the width direction A of the insertion portion 5.

As shown in FIG. 1, the hanging portion 6 has a plate shape extending downward from the underside of the left end of the upper horizontal portion 25. The lower end of the hanging portion 6 is disposed at the same height level as the left end of the lower horizontal portion 31. The hanging portion 6 extends along the longitudinal direction B, and has the same length in the longitudinal direction B as the upper plate portion 2. The hanging portion 6 faces the connecting plate portion 4 and the rising portion 24 across the ventilation space S. As shown in FIG. 1 and FIG. 3, a ventilation hole 9 that leads to the ventilation space S is formed between the lower end of the hanging portion 6 and the left end of the lower horizontal portion 31.

As shown in FIG. 1, the inclined plate portion 7 is formed by extending diagonally upward to the left from the lower end of the hanging portion 6 (opposite the vent 9) perpendicular to the longitudinal direction B. When the eaves soffit ventilation material 1 is installed under the eaves, the tip of this inclined plate portion 7 abuts against the back side of the fascia board 104 described below. By inclining the inclined plate portion 7 in this way and abutting the tip against the fascia board 104, even if the eaves soffit ventilation material 1 itself is heated by a fire or the like and becomes somewhat soft, the tip of the inclined plate portion 7 is braced by abutting against the fascia board 104, and the inclined plate portion 7 is less likely to deform so as to hang downward. In addition, the inclined plate portion 7 has a portion at its left end where the upper plate material 1a of the part that constitutes the inclined plate portion 7 is folded back in a U-shape and overlapped.

As shown in FIG. 1, the thermal expansion material 8 is disposed on the lower horizontal portion 31 of the lower plate portion 3 in the ventilation space S. More specifically, the thermal expansion material 8 is disposed on the left side of the connecting position of the lower horizontal portion 31 connected to the connecting plate portion 4. The left side of the lower horizontal portion 31 is disposed between the connecting plate portion 4 and the ventilation hole 9 in the width direction A, and the portion near the connecting plate portion 4 is disposed so as to overlap the ventilation hole 23a along the vertical direction C. The right side of the thermal expansion material 8 is disposed so as to overlap the ventilation hole 23a along the vertical direction C. In other words, the thermal expansion material 8 is disposed on the lower horizontal portion 31 so as to face the ventilation hole 23a.

In this embodiment, the thermal expansion material 8 expands in volume by several tens of times during a fire to block the ventilation space S and the ventilation holes 23a. There are no particular limitations on the material used, and a wide range of known materials can be used.

As shown in FIG. 1, the thermal expansion material 8 has a long, approximately rectangular parallelepiped shape along the longitudinal direction B before heating. The shape of the thermal expansion material 8 is not particularly limited, and may be a shape other than a rectangular parallelepiped shape. The thermal expansion material 8 may be configured by arranging a plurality of short expansion bodies along the longitudinal direction B before heating. These plurality of expansion bodies may be continuously connected to each other along the longitudinal direction B, or may be discontinuous without being connected. When the thermal expansion material 8 is heated by a fire or the like, it expands as a whole and abuts against the lower end of the inclined portion 23, so that the expansion is partially restricted, and the left and right portions of the thermal expansion material 8 that are not restricted expand as they are, resulting in a state shown by the two-dot chain line in FIG. 1. By expanding in this way, the thermal expansion material 8 can occupy the entire space (the space S1 having an acute angle in cross section) to the right of the ventilation opening 9 of the ventilation space S and the right portion of the portion facing the ventilation opening 9 in the vertical direction C of the ventilation space S. In this way, the thermal expansion material 8 is configured so that it can cover and block the ventilation hole 23a when heated by a fire or the like. The thermal expansion material 8 is also arranged in a position facing the lower end of the sloped portion 23 along the vertical direction C. Therefore, when the thermal expansion material 8 expands, it expands so that the lower end of the sloped portion 23 bites into it. Therefore, even if the thermal expansion material 8 shrinks over time after expanding, gaps are less likely to occur in the part where the lower end of the sloped portion 23 of the thermal expansion material 8 bites into it, making it possible to prevent air leakage.

To manufacture such an eaves soffit ventilation material 1, first, the upper plate material 1a and the lower plate material 1b are manufactured separately by bending and punching the thin plate as described above. After that, the thermal expansion material 8 is attached to a predetermined location of the lower horizontal part 31 of the lower plate material 1b. Since the eaves soffit ventilation material 1 is made by combining two plate materials 1a and 1b, it is easy to attach the thermal expansion material 8. After that, the right end of the upper plate material 1a and the right end of the lower plate material 1b are connected with tape 10 to manufacture the eaves soffit ventilation material 1. It is possible to change the vertical width of the insertion part 5 according to the thickness of the eaves soffit material by replacing it with the lower plate material 1b in which the inclination angle of the gripping part 32 relative to the lower horizontal part 31 is changed.

Next, the building structure in which the eaves ventilation material 1 is installed under the eaves will be described below with reference to Figures 4 and 5. As shown in Figure 4, the building structure 100 is composed of a roof structure of a wooden house composed of roof members 101, rafters 102, base material 103, fascia board 104, and rafters 105, etc., the eaves ventilation material 1 attached from below to the base material 103 and rafters 105, and the eaves soffit material 106. The building structure 100 in this embodiment is a structure when the eaves ventilation material 1 is installed at the nose, and is configured by fastening the upper horizontal part 25 to the base material 103 with a screw 110, fastening the fixing part 21 to the rafters 105 with a screw 111 so that the vent 9 is arranged on the nose side, and then inserting the end of the eaves soffit material 106 into the insertion part 5 and arranging it. At this time, the eaves soffit ventilation material 1 is attached to the rafter 105 so that the drainage holes 23b of the eaves soffit ventilation material 1 and the rafter 105 face each other in the vertical direction C. This allows water such as rain to seep in through the drainage holes 23b due to strong winds, etc., and the water that seeps in will adhere to the underside of the rafter 105. This makes it possible to prevent water from flowing to the back side (upper surface side) of the eaves soffit material 106.

In addition, the eaves soffit ventilation material 1 has a sloped portion 23, and since the ventilation hole 23a is formed in the sloped portion 23, even if the ventilation hole 23a faces the soffit 105, the ventilation hole 23a is not sealed by the soffit 105. In other words, a space is formed between the ventilation hole 23a and the soffit 105 by the formation of the sloped portion 23. Therefore, it is possible to suppress the decrease in ventilation capacity caused by the ventilation hole 23a being sealed by the soffit 105. In addition, the sloped portion 23 is inclined downward in the width direction A as it approaches the ventilation hole 9, and since the ventilation hole 23a is formed in the sloped portion 23, when the user looks at the installed eaves soffit ventilation material 1 from below, the ventilation hole 23a is almost invisible through the ventilation hole 9. Therefore, it has excellent aesthetics.

In addition, in the building structure 100, the eaves ventilation material 1 is fixed to the base material 103 and the rafters 105 in the width direction A on both sides of the sloped portion 23 with screws 110, 111. Therefore, even if the eaves ventilation material 1 is heated by a fire or the like, it is less likely to deform than if it is fixed on only one side. Therefore, air leakage is less likely to occur near the eaves ventilation material 1.

To attach the eaves soffit ventilation material 1 to the base material 103 and the rafters 105, as shown in FIG. 5(a), the upper plate material 1a and the lower plate material 1b that constitute the eaves soffit ventilation material 1 are opened around the right end of the upper plate portion 2. Then, with the tip (left end) of the inclined plate portion 7 of the eaves soffit ventilation material 1 abutting against the back surface of the fascia board 104, the upper horizontal portion 25 of the upper plate material 1a is fastened to the base material 103 with a screw 110. At this time, since the lower plate material 1b is arranged to hang from the upper plate material 1a via the tape 10, when the upper plate material 1a is temporarily fixed to the base material 103, it is difficult for a tool to come into contact with the lower plate material 1b, and damage to the lower plate portion 3 of the eaves soffit ventilation material 1 can be suppressed.

Next, as shown in FIG. 5(b), the portion of the lower plate 1b corresponding to the curved portion 21a is fitted into the portion of the upper plate 1a corresponding to the curved portion 21a, and the lower plate 1b and the upper plate 1a are aligned. Then, the curved portion 21a is fastened to the rafters 105 from below with screws 111. In this way, the eaves soffit ventilation material 1 is permanently fixed to the base material 103 and the rafters 105 and installed. After this, as shown in FIG. 4, the end of the eaves soffit material 106 is inserted into the insertion portion 5 and positioned to complete the building structure 100.

In the above embodiment, the eaves soffit ventilation material 1 is installed at the eaves tip, but the eaves soffit ventilation material 1 may be installed at the base of the wall by flipping the left and right sides in FIG. 4, or the eaves soffit ventilation material 1 may be installed in the middle of the joist 105. In other words, the installation position of the eaves soffit ventilation material 1 is not particularly limited as long as it is installed under the eaves.

As described above, in the eaves ventilating material 1 of this embodiment, the portion defining the insertion portion 5 of the lower plate portion 3 is composed of the right portion of the lower horizontal portion 31 (the portion extending horizontally from the connection position with the lower end of the connecting plate portion 4 toward the insertion portion 5) and the mouth portion 32. As a result, even if water such as rain enters between the eaves soffit material 106 and the mouth portion 32 due to strong winds, the water is more likely to flow along the upper surface of the mouth portion 32 toward the lower horizontal portion 31. In other words, as shown in FIG. 4, water W3 (shown by a two-dot chain line in the figure) that has entered between the eaves soffit material 106 and the mouth portion 32 flows toward the lower horizontal portion 31 while moving away from the end of the eaves soffit material 106. As a result, water is less likely to flow to the end of the eaves soffit material 106. Therefore, it is possible to prevent water from seeping in through the small opening at the end of the eaves material 106 or from going around the end to the back side (upper surface side: attic side) of the eaves material 106. In addition, the lower plate portion 3 has a lower horizontal portion 31 and a gripping portion 32 that slopes upward as it approaches the end of the lower plate portion 3 on the insertion portion 5 side. This allows water adhering to the underside of the gripping portion 32 to flow along the underside and easily drop near the end of the lower horizontal portion 31, making it difficult for the water to flow toward the ventilation opening 9. This makes it difficult for water flowing from the gripping portion 32 to enter the ventilation space S from the ventilation opening 9.

The ventilation section 22 faces the lower horizontal section 31 in the vertical direction C with the ventilation space S in between, and the hanging portion 6 hanging from the underside of the upper horizontal section 25 faces the connecting plate section 4 in the width direction A with the ventilation space S in between, and a ventilation hole 9 leading to the ventilation space S is formed between the lower end of the hanging portion 6 and the left end of the lower horizontal section 31. As a result, water such as rain will enter the ventilation space S through the ventilation hole 9 and then enter through the ventilation hole 23a. This makes it difficult for water to enter the ventilation hole 23a.

In addition, a thermal expansion material 8 is placed in the ventilation space S. This makes it possible to prevent flames from entering the attic through the ventilation space S and the ventilation hole 23a in the event of a fire.

The thermal expansion material 8 is also placed on the lower horizontal portion 31 so as to face the ventilation hole 23a. This makes it possible to cover the ventilation hole 23a with the thermal expansion material 8 in the event of a fire, further preventing flames from entering the attic through the ventilation hole 23a.

In addition, according to the eaves ventilation material 1 and the building structure 100 in this embodiment, since the ventilation hole 23a is formed in the slope portion 23 that slopes diagonally downward, even if water such as rain enters the ventilation hole 23a from the outside due to strong winds, the entered water slides down along the upper surface of the slope portion 23. That is, as shown in FIG. 2, multiple water droplets W1 (shown by a two-dot chain line in FIG. 2) that entered from the ventilation hole 23a slide down to the left along the upper surface of the slope portion 23. Then, at the bottom of the recess 26, the multiple water droplets W1 that have flowed down gather together to form water droplets W2 (shown by a two-dot chain line in FIG. 2), which grow to extend in the longitudinal direction B, and the end of the water droplets W2 reaches the water drainage hole 23b, causing the water droplets W2 to drip downward from the water drainage hole 23b. In this way, the water that entered from the ventilation hole 23a is discharged from the eaves ventilation material 1 to the outside. As a result, it is possible to prevent water from penetrating the back side (upper surface side: attic side) of the eaves material 106. In addition, by forming the ventilation hole 23a on the sloped portion 23, the opening width of the ventilation hole 23a can be increased along the slope, and the opening area can be increased.

In addition, because a drain hole 23b is formed in the lower part of the sloped portion 23, even if water enters through the ventilation hole 23a, it can slide down along the sloped portion 23 and then be discharged to the outside through the drain hole 23b.

In addition, multiple drainage holes 23b are formed along the longitudinal direction B, making it possible to effectively drain water that accumulates in the lower part of the sloped portion 23.

As shown in Figure 1, the connecting plate portion 4 and the slope portion 23 are formed so that a space S1 with an acute angle in cross section is defined between them. Because the space S1 between the slope portion 23 and the connecting plate portion 4 has an acute angle in cross section, rain or other water that flows from the vent 9 toward the ventilation hole 23a due to strong winds or the like tends to collect at the upper corner of the space S1 (upper right corner in Figure 1). As a result, the collected water tends to flow downward along the connecting plate portion 4 and is less likely to enter through the ventilation hole 23a.

The hanging portion 6 is disposed opposite the connecting plate portion 4 and the rising portion 24 across the ventilation space S, and a ventilation hole 9 is formed between the lower end of the hanging portion 6 and the lower plate portion 3. This makes it easier for rainwater or other water that has entered the ventilation space S from the ventilation hole 9 due to strong winds to enter the space between the rising portion 24 and the hanging portion 6 in the ventilation space S. This is because when a strong wind blows in through the ventilation hole 9, a U-turn airflow is generated in the ventilation space S, moving from the ventilation hole 9 to the upper horizontal portion 25, then to the rising portion 24, and then downward. This makes it easier for water to adhere to the surface of the rising portion 24 that faces the hanging portion 6, and the adhered water gathers together and falls downward. As a result, water is less likely to enter through the ventilation hole 23a.

In addition, the inclined plate portion 7 extends diagonally upward from the lower end of the hanging portion 6. This allows water adhering to the inclined plate portion 7 to flow along the inclined plate portion 7 and easily drop downward from the lower end of the hanging portion 6. In addition, by abutting the tip of the inclined plate portion 7 against the back side of the fascia board 104 and attaching the eaves roof ventilation material 1, it is possible to prevent the inclined plate portion 7 from sagging even if it is deformed.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment, and various modifications are possible within the scope of the claims. For example, the connecting plate portion 4 in the above-mentioned embodiment is inclined so that the lower end approaches the ventilation hole 9 as it approaches the bottom, but it may be formed vertically along the vertical direction C, or may be formed so that the lower end is inclined so as to move away from the ventilation hole 9 as it approaches the bottom. The connecting plate portion 4 is inclined as a whole, but may have an inclined portion that is inclined in part. For example, the upper and lower ends of the connecting plate portion may extend vertically, and an inclined portion inclined with respect to the vertical and horizontal may be disposed in the center between these two ends.

The ventilation holes 23a may be formed at any position on the sloped surface 23. Although the ventilation holes 23a are formed by punching the sloped surface 23, the ventilation holes may be formed by creating a recess in the sloped surface 23 and opening into the side surface of the recess.

The thermal expansion material 8 only needs to be placed in the ventilation space, and does not need to be placed opposite the ventilation hole 23a. The thermal expansion material 8 does not need to be provided. The inclined surface portion 23 only needs to have at least one drainage hole 23b formed therein. The drainage hole 23b does not need to be formed. The hanging portion 6 and the inclined plate portion 7 do not need to be formed.

In addition, in the present embodiment, the upper plate 1a and the lower plate 1b of the eaves ventilation material 1 are connected at their right ends by tape 10, but instead of the tape 10, a hinge connection may be used so that the lower plate 1b can be opened and closed around the hinge at the right end relative to the upper plate 1a. Alternatively, the upper plate 1a and the lower plate 1b may be made of a single steel plate with their right ends connected together.

As shown in FIG. 1, the upper plate 2 is formed with a groove-shaped ventilation section 22 whose entire bottom surface is inclined by the fixed section 21, the sloped section 23, the rising section 24, and the upper horizontal section 25, but a part of the bottom surface may be inclined, or inclined surfaces with different inclination angles may be combined, the ventilation section may be a groove-shaped ventilation section with a horizontal bottom surface, or a groove-shaped ventilation section with an inclined bottom surface and rising sections formed on both ends.

REFERENCE SIGNS LIST 1 Eaves ventilation material 2 Upper plate portion 3 Lower plate portion 4 Connecting plate portion 5 Insertion portion 6 Hanging portion 7 Inclined plate portion 8 Thermal expansion material 9 Vent 23 Inclined portion 23a Ventilation hole 23b Water drainage hole 24 Rising portion 26 Recess 31 Lower horizontal portion (horizontal portion)
32 Bit part (slanted part)
105 Rafter 106 Eaves material S Ventilation space S1 Space

Claims (6)

An eaves ventilation material having an upper plate portion, a lower plate portion facing the upper plate portion, and a connecting plate portion connecting the upper plate portion and the lower plate portion,
A groove-shaped insertion portion into which an end of the eaves material can be inserted is formed between the upper plate portion and the lower plate portion,
A portion of the insertion portion is defined by the lower plate portion and the connecting plate portion,
a portion of the lower plate portion defining the insertion portion is configured by a horizontal portion extending horizontally from a connection position with the lower end of the connecting plate portion toward the insertion portion side, and an inclined portion inclining upward from the end of the horizontal portion on the insertion portion side toward the end of the lower plate portion on the insertion portion side ,
The horizontal portion is continuous with the portion extending horizontally toward the insertion portion, and extends horizontally from the connection position to the opposite side from the insertion portion . The eaves ventilation material according to claim 1, characterized in that the connecting plate portion has an inclined surface that slopes upward from the connecting position with the lower plate portion toward the insertion portion. the upper plate portion has a ventilation portion that extends from a connection position with the upper end of the connecting plate portion to an outer side of an end of the horizontal portion opposite to the insertion portion in an extending direction of the horizontal portion, and has a ventilation hole penetrating therethrough in a thickness direction;
The ventilation section faces the horizontal section across a ventilation space,
The air passage further includes a hanging portion extending downward from a lower surface of the upper plate portion and facing the connecting plate portion across the ventilation space,
The eaves ventilation material according to claim 1 or 2, characterized in that an air vent leading to the ventilation space is formed between the lower end of the hanging portion and the end of the horizontal portion opposite the insertion portion. The eaves ventilation material according to claim 3, further comprising a thermal expansion material disposed in the ventilation space. The ventilation hole is disposed at a position overlapping with the horizontal portion along the up-down direction,
The eaves ventilation material according to claim 4, characterized in that the thermal expansion material is arranged on the horizontal portion so as to face the ventilation hole. The ventilation section has a slope portion extending diagonally downward,
The eaves ventilation material according to any one of claims 3 to 5, characterized in that the ventilation holes are formed in the sloped portion.

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