Eaves ventilation material

Abstract

To provide an eaves ventilation material capable of suppressing water having entered between the eaves material and the lower plate from infiltrating from the edge of the eaves material, or going around the edges and infiltrating the back of the eaves material.SOLUTION: An eaves ventilation material 1 includes an upper plate part 2, a lower plate part 3, a connecting plate part 4, and an insertion part 5. A part of the insertion part 5 is defined by the lower plate part 2 and the connecting plate part 4. The part defining the insertion part 5 of the lower plate part 3 is constituted of a lower horizontal portion 31, which extends horizontally from the connection position with the lower end of the connecting plate part 4 to the insertion part 5 side and a claw part 32 that inclines upward as it approaches the end of the lower horizontal portion 31 at the insertion part 5 side to the end of the lower plate part 3 at the insertion part 5 side.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an eaves ventilation material for ventilating the attic of a building. [Background technology]

[0002] Conventionally, eaves ventilators have been installed under the eaves to exhaust moisture and hot air from the attic of a wooden house, etc. Known examples of such eaves ventilators include an upper plate (upper plate portion) in which multiple ventilation openings (ventilation holes) are formed, a lower plate (lower plate portion) disposed opposite the upper plate and in which ventilation slits are formed, and a sloped plate (connecting plate portion) that connects the upper plate and the lower plate and defines a groove-shaped insertion portion between a part of the upper plate and a part of the lower plate into which an end of the eaves ventilator can be inserted (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-100052 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the eaves soffit ventilation material described in the above Patent Document 1, a part of the lower panel that defines a part of the insertion part is formed horizontally parallel to the upper panel. Therefore, when water such as rain enters between the part of the lower panel and the eaves soffit material inserted into the insertion part due to a strong wind, the water may seep in through the small opening at the end of the eaves soffit material or flow around the end to the back side (upper side) of the eaves soffit material.

[0005] Therefore, 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. [Means for solving the problem]

[0006] The eaves soffit ventilation material of the present invention is an eaves soffit ventilation material comprising an upper plate portion, a lower plate portion opposed to 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 portion of the eaves soffit material can be inserted is formed between the upper plate portion and the lower plate portion, a part of the insertion portion is defined by the lower plate portion and the connecting plate portion, and the portion of the lower plate portion defining the insertion portion is constituted by 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 inclining upward as it approaches the end portion of the horizontal portion on the insertion portion side toward the end portion of the lower plate portion on the insertion portion side. The horizontal portion extends horizontally from the connecting position to the opposite side to the insertion portion, continuously with the portion extending horizontally toward the insertion portion. is.

[0007] According to this, since the portion that defines the insertion portion of the lower board is composed of a horizontal portion and an inclined portion, even if water such as rain gets in between the eaves soffit material and the inclined portion due to strong winds, the water is likely to flow along the inclined portion to the horizontal portion. This makes it difficult for water to flow to the end (edge) of the eaves soffit material. Therefore, it is possible to prevent water from seeping in through the edge of the eaves soffit material or from going around the edge to the back side of the eaves soffit material.

[0008] 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 side. This makes it possible to reliably form a space between the connecting plate portion and the end of the eaves ceiling material when the eaves ceiling material is inserted into the insertion portion from the end, and more reliably prevents water absorption from the small edge of the eaves ceiling material.

[0009] In the present invention ,beforeThe upper plate has a ventilation section that extends from the connection position with the upper end of the connecting plate section to the outside of the end of the horizontal section opposite the insertion section in the extending direction of the horizontal section, and has a ventilation hole formed therethrough in the thickness direction, and the ventilation section faces the horizontal section across a ventilation space, and further includes a hanging section that extends downward from the lower surface of the upper plate section and faces the connecting plate section 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 section and the end of the horizontal section opposite the insertion section. 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.

[0010] In the present invention, it is preferable that a thermal expansion material is further provided in the ventilation space, which makes it possible to prevent flames from entering the attic through the ventilation space and the ventilation hole in the event of a fire.

[0011] In the present invention, it is preferable that the ventilation hole is arranged at a position overlapping the horizontal portion along 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.

[0012] In the present invention, it is preferable that the ventilation section has a slope extending diagonally downward, and the ventilation hole is formed on the slope. As a result, even if water such as rain enters the ventilation hole from the outside due to strong winds, the water slides down along the slope. This makes it possible to prevent water from entering the back side of the eaves material. Also, by forming the ventilation hole on the slope, the opening width of the ventilation hole can be increased along the slope, thereby increasing the opening area. Effect of the Invention

[0013] According to the eaves soffit ventilation material of the present invention, the portion that defines the insertion portion of the lower board is composed of a horizontal portion and an inclined portion, so even if water such as rain gets in 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 from going around the edge and entering the back side of the eaves soffit material (attic). [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a side view of an eaves ventilation material according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a top view of the eaves ventilation material shown in FIG. 1. [Diagram 3] FIG. 2 is a bottom view of the eaves ventilation material shown in FIG. 1. [Figure 4] FIG. 2 is an explanatory diagram showing the state in which the eaves ventilation material shown in FIG. 1 is installed under the eaves. [Diagram 5] FIG. 1(a) is a diagram showing the state in which the eaves soffit ventilation material has been temporarily fixed under the eaves, and FIG. 1(b) is a diagram showing the state in which the eaves soffit ventilation material has been permanently fixed under the eaves. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, a soffit ventilation material according to one embodiment of the present invention will be described with reference to Figs. 1 to 3.

[0016] The eaves ventilating material 1 is installed under the eaves to exhaust 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 disposed 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. A ventilation space S is defined within the eaves ventilating material 1 by these component parts 2-6.

[0017] The eaves ventilating material 1 in this embodiment 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 Fig. 1 is defined as width direction A (extension direction), the horizontal direction perpendicular to width direction A is defined as longitudinal direction B, and the direction perpendicular to width direction A and longitudinal direction B is defined as up-down direction C. Figs. 2 to 5 are also shown reflecting directions A to C.

[0018] As shown in FIG. 1, the eaves ventilating material 1 in this embodiment is configured by combining an upper plate material 1a located on the upper side and a lower plate material 1b located on the lower side of the upper plate material 1a. The upper plate material 1a is configured by bending or punching a long thin plate in the longitudinal direction B, and the lower plate material 1b is also configured by bending a long thin plate in the longitudinal direction B. The upper plate material 1a and the lower plate material 1b have the same length in the longitudinal direction B. Then, a connecting tape 10 is attached 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, so that both are connected at the right end. 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 soffit ventilation material 1 is formed long in the longitudinal direction B, and the component parts 2 to 7 have the same length in the longitudinal direction B. Furthermore, the upper plate material 1a constitutes most of the upper plate portion 2 (the upper part of the fixing portion 21, and 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.

[0019] 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 ventilating material 1 under the eaves and a ventilation portion 22. As shown in Fig. 1, the fixing portion 21 is disposed 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 formed 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 portion (portion formed by the lower plate material 1b) of the fixing portion 21. 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 a portion into which a screw or a nail is screwed or driven when fixing the eaves ventilating material 1. Furthermore, the portion of the upper plate material 1a corresponding to the curved portion 21a and the portion of the lower plate material 1b corresponding to the curved portion 21a are configured to be able to fit into each other, and can also be used to align the upper plate material 1a and the lower plate material 1b.

[0020] 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 from the upper surface (left end) of the fixed section 21, perpendicular to the longitudinal direction B. 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.

[0021] As shown in FIG. 1, the plurality of ventilation holes 23a are formed in the middle of the inclined surface portion 23, i.e., in the center, in the width direction A, and are arranged at a position overlapping with the lower horizontal portion 31 (described later) of the lower plate portion 2 along the up-down direction C. As shown in FIG. 2, the inclined surface portion 23 is formed with a plurality of 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 portion of the inclined surface portion 23, and are arranged at a position overlapping with the lower portion of the ventilation holes 23a in the width direction A. The number of the drainage holes 23b is smaller than that of the ventilation holes 23a, and the drainage holes 23b are arranged at a pitch larger than the arrangement pitch of the ventilation holes 23a in the longitudinal direction B. The arrangement pitch of the drainage holes 23b in this embodiment is set to an arrangement pitch that allows the drainage holes 23b to be arranged facing the rafters in the up-down direction C when the rafters are arranged at a pitch of 455 mm in the longitudinal direction B. This makes it possible to arrange the drainage holes 23b facing the rafters in the up-down direction C.

[0022] 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 (leftward) 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 where the upper end of the connecting plate portion 4 of the upper plate portion 2 is 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 a portion into which screws, nails, etc. are screwed or driven when the upper plate material 1a of the eaves ventilating material 1 is temporarily fixed.

[0023] As shown in Fig. 1, the connecting plate part 4 has an upper end connected to the upper plate part 2 and a lower end connected to the lower plate part 3, and extends diagonally downward to the left from the left end part of the fixing part 21 (part formed by the lower plate material 1b). In other words, the connecting plate part 4 is composed of an inclined part extending in a direction perpendicular to the longitudinal direction B and inclined to the width direction A. Since the connecting plate part 4 has an inclined surface that inclines upward from the connection position with the lower plate part 3 toward the insertion part 5 side, a space can be reliably formed between the connecting plate part 4 and the end part of the eaves soffit material 106 when the eaves soffit material 106 described below is inserted from its end into the insertion part 5, and water absorption from the small edge of the eaves soffit material 106 can be more reliably prevented.

[0024] 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 and faces the inclined surface portion 23 in the up-down direction C. The connecting plate portion 4 is inclined such that the angle θ1 formed by the connecting plate portion 4 with the fixed portion 21 is smaller than the angle θ2 formed by the fixed portion 21 with 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.

[0025] 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 therebetween. The lower plate portion 3 also has a horizontal lower horizontal portion 31 that faces the inclined surface portion 23 with the ventilation space S 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. In this manner, lower horizontal portion 31 has a portion extending horizontally to the right from the connecting position where it is connected to the lower end of connecting plate portion 4, and a portion extending horizontally to the left.

[0026] As shown in FIG. 1, the mouthpiece 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 mouthpiece 32 has a portion at its right end where the lower plate material 1b constituting the mouthpiece 32 is folded back in a U-shape and overlapped. The mouthpiece 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 (the fixing portion 21) define the insertion portion 5. 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 ceiling material 50 described later can be inserted. That is, an open insertion port 5a for inserting the end of the eaves ceiling material 50 is formed at one end of the width direction A of the insertion portion 5.

[0027] As shown in Fig. 1, hanging portion 6 has a plate shape extending downward from the underside of the left end portion of upper horizontal portion 25. The lower end of hanging portion 6 is disposed at the same height level as the left end portion of lower horizontal portion 31. Hanging portion 6 extends along longitudinal direction B, and has the same length in longitudinal direction B as upper plate portion 2. Hanging portion 6 faces connecting plate portion 4 and rising portion 24 with ventilation space S in between. As shown in Figs. 1 and 3, ventilation hole 9 leading to ventilation space S is formed between the lower end of hanging portion 6 and the left end portion of lower horizontal portion 31.

[0028] As shown in FIG. 1, the inclined plate portion 7 is formed to extend 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 later. 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 and somewhat softened due to a fire or the like, the tip of the inclined plate portion 7 is braced by abutting against the fascia board 104, and the inclined plate portion 7 is unlikely to deform so as to hang downward. In addition, the inclined plate portion 7 has a part at its left end where the upper plate material 1a of the part constituting the inclined plate portion 7 is folded back in a U-shape and overlapped.

[0029] As shown in FIG. 1, the thermal expansion material 8 is disposed in the ventilation space S on the lower horizontal portion 31 of the lower plate portion 3. 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 thermal expansion material 8 is disposed so that its right side overlaps 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.

[0030] In this embodiment, the thermal expansion material 8 expands in volume by several tens of times in the event of a fire, blocking the ventilation space S and the ventilation holes 23a. There is no particular limitation on the material used, and a wide range of known materials can be used.

[0031] As shown in FIG. 1, the thermal expansion material 8 has a substantially rectangular parallelepiped shape that is long 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 surface portion 23, so that the expansion is partially restricted, and the left and right parts of the thermal expansion material 8 that are not restricted expand as they are, and the state shown by the two-dot chain line in FIG. 1 is reached. By expanding in this way, the thermal expansion material 8 can occupy the entire space (space S1 having an acute angle in cross section) on the right side of the ventilation space S from the ventilation port 9 and the right part of the ventilation space S facing the ventilation port 9 in the vertical direction C. In this way, the thermal expansion material 8 is configured to be able to cover and close the ventilation hole 23a when heated by fire or the like. The thermal expansion material 8 is also arranged at a position facing the lower end of the sloped portion 23 along the vertical direction C. Therefore, the thermal expansion material 8 expands so that the lower end of the sloped portion 23 bites into it when it expands. Therefore, even if the thermal expansion material 8 shrinks over time after expansion, a gap is unlikely to occur in the portion of the thermal expansion material 8 where the lower end of the sloped portion 23 bites into it, making it possible to prevent air leakage.

[0032] 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 the eaves soffit ventilation material 1 with the lower plate material 1b in which the inclination angle of the mouth part 32 with respect to the lower horizontal part 31 is changed.

[0033] Next, a building structure in which the eaves soffit 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 includes 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 soffit ventilation material 1 attached to the base material 103 and rafters 105 from below, and the eaves soffit material 106. The building structure 100 in this embodiment is a structure when the eaves soffit 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. As a result, even if water such as rain enters through the drainage holes 23b due to strong winds, the entered water adheres to the underside of the rafter 105. This makes it possible to prevent water from flowing onto the back side (upper surface side) of the eaves soffit material 106.

[0034] In addition, the eaves ventilating material 1 has a sloped surface 23, and the ventilation hole 23a is formed in the sloped surface 23, so that even if the ventilation hole 23a faces the rafter 105, the ventilation hole 23a is not sealed by the rafter 105. In other words, a space is formed between the ventilation hole 23a and the rafter 105 by the formation of the sloped surface 23. Therefore, it is possible to suppress the decrease in ventilation capacity caused by the ventilation hole 23a being sealed by the rafter 105. In addition, the sloped surface 23 is inclined downward in the width direction A as it approaches the vent 9, and the ventilation hole 23a is formed in the sloped surface 23, so that when a user looks at the installed eaves ventilating material 1 from below, the ventilation hole 23a is almost invisible through the vent 9. Therefore, it has excellent aesthetics.

[0035] In addition, in the building structure 100, the soffit ventilation material 1 is fixed to the base material 103 and the rafters 105 with screws 110, 111 on both sides of the sloped surface 23 in the width direction A. Therefore, even if the soffit ventilation material 1 is heated by a fire or the like, it is less likely to deform than if it was fixed only on one side. Therefore, air leakage is less likely to occur near the soffit ventilation material 1.

[0036] To attach the eaves soffit ventilation material 1 to the base material 103 and the joist 105, as shown in FIG. 5(a), the upper plate material 1a and the lower plate material 1b constituting 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 therefore it is possible to prevent the lower plate portion 3 of the eaves soffit ventilation material 1 from being scratched.

[0037] Next, as shown in Fig. 5(b), the portion of lower plate material 1b corresponding to curved portion 21a is fitted into the portion of upper plate material 1a corresponding to curved portion 21a, and lower plate material 1b and upper plate material 1a are aligned. Then, curved portion 21a is fastened to rafters 105 from below with screws 111. In this way, soffit ventilation material 1 is permanently fixed to base material 103 and rafters 105 and installed. Thereafter, as shown in Fig. 4, the end of soffit material 106 is inserted into insertion portion 5 and positioned, thereby completing building structure 100.

[0038] 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 it over 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.

[0039] As described above, according to 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 side) 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 likely to flow along the upper surface of the mouth portion 32 toward the lower horizontal portion 31 side. 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. For this reason, 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 ceiling material 106, or from going around the end to the back side (upper surface side: attic side) of the eaves ceiling material 106. In addition, the lower plate portion 3 has a lower horizontal portion 31 and a mouth portion 32 that slopes upward as it approaches the end of the lower plate portion 3 on the side of the insertion portion 5. This allows water adhering to the lower surface of the mouth portion 32 to flow along the lower surface and to 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 mouth portion 32 to enter the ventilation space S from the ventilation opening 9.

[0040] In addition, ventilation section 22 faces lower horizontal section 31 in the up-down direction C with ventilation space S in between, and hanging section 6 hanging from the lower surface of upper horizontal section 25 faces connecting plate section 4 in the width direction A with ventilation space S in between, and ventilation hole 9 leading to ventilation space S is formed between the lower end of hanging section 6 and the left end of lower horizontal section 31. As a result, water such as rain will enter ventilation space S from ventilation hole 9 and then enter from ventilation hole 23a. This makes it difficult for water to enter ventilation hole 23a.

[0041] In addition, the thermal expansion material 8 is disposed 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.

[0042] Moreover, the thermal expansion material 8 is disposed 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, and makes it possible to further prevent flames from entering the attic through the ventilation hole 23a.

[0043] In addition, according to the eaves ventilating material 1 and the building structure 100 of 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, a plurality of water droplets W1 (shown by a two-dot chain line in FIG. 2) that entered from the ventilation hole 23a slides down to the left along the upper surface of the slope portion 23. Then, at the bottom of the recess 26, a water droplet W2 (shown by a two-dot chain line in FIG. 2) that is a collection of the plurality of water droplets W1 that have flowed down grows to extend in the longitudinal direction B, and the end of the water droplet W2 reaches the water drainage hole 23b, so that the water droplet W2 drips downward from the water drainage hole 23b. In this way, the water that entered from the ventilation hole 23a is discharged from the eaves ventilating material 1 to the outside. As a result, it is possible to prevent water from penetrating to the back side (upper surface side: attic side) of the eaves material 106. In addition, by forming the ventilation holes 23a in the sloped portion 23, the opening width of the ventilation holes 23a can be made larger along the slope, and the opening area can be increased.

[0044] In addition, since a water drainage 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 water drainage hole 23b.

[0045] In addition, since a plurality of water drainage holes 23b are formed along the longitudinal direction B, water that accumulates in the lower portion of the inclined surface portion 23 can be effectively drained.

[0046] As shown in Fig. 1, the connecting plate portion 4 and the slope portion 23 are formed so as to define a space S1 having an acute angle in cross section between them. Since the space S1 between the slope portion 23 and the connecting plate portion 4 has an acute angle in cross section, water such as rain 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 (the upper right corner in Fig. 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.

[0047] In addition, the hanging portion 6 is disposed opposite the connecting plate portion 4 and the rising portion 24 with the ventilation space S interposed therebetween, and the 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 water such as rain that has entered the ventilation space S from the ventilation hole 9 due to strong winds or the like 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 from the ventilation hole 9, a U-turn air current is generated in the ventilation space S, which flows from the ventilation hole 9 to the upper horizontal portion 25, then to the rising portion 24, and then downward. For this reason, water is more likely to adhere to the surface of the rising portion 24 facing 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.

[0048] In addition, the inclined plate portion 7 extends obliquely upward from the lower end of the hanging portion 6. This makes it easier for water adhering to the inclined plate portion 7 to flow along the inclined plate portion 7 and drop downward from the lower end of the hanging portion 6. In addition, by attaching the main eaves ventilating material 1 with the tip of the inclined plate portion 7 abutting against the back side of the fascia board 104, it is possible to prevent the inclined plate portion 7 from sagging even if it is deformed.

[0049] Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible as long as they are within the scope of the claims. For example, the connecting plate portion 4 in the above embodiment is inclined so that the lower end approaches the ventilation opening 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 opening 9 as it approaches the bottom. The connecting plate portion 4 is inclined as a whole, but may have an inclined portion that is partially inclined. For example, the upper end and the lower end 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.

[0050] Also, ventilation hole 23a may be formed at any position as long as it is formed in inclined surface portion 23. Also, ventilation hole 23a is formed by punching inclined surface portion 23, but the ventilation hole may be formed by providing a recess in inclined surface portion 23 and opening into the side surface of the recess.

[0051] Furthermore, it is sufficient that the thermal expansion material 8 is disposed in the ventilation space, and it is not necessary that it is disposed opposite the ventilation hole 23a. Furthermore, the thermal expansion material 8 does not have to be provided. Furthermore, it is sufficient that at least one water drainage hole 23b is formed in the inclined surface portion 23. Furthermore, the water drainage hole 23b does not have to be formed. Furthermore, the hanging portion 6 and the inclined plate portion 7 do not have to be formed.

[0052] In addition, in the eaves ventilating material 1 in this embodiment, the upper plate material 1a and the lower plate material 1b are connected at their right ends by tape 10, but the lower plate material 1b may be opened and closed around a hinge at the right end relative to the upper plate material 1a by a hinge connection instead of the tape 10. Alternatively, the upper plate material 1a and the lower plate material 1b may be formed from a single steel plate with their right ends connected to each other.

[0053] In addition, as shown in Figure 1, the upper plate portion 2 has a groove-shaped ventilation portion 22 whose entire bottom surface is inclined by the fixed portion 21, the inclined portion 23, the rising portion 24 and the upper horizontal portion 25, but the bottom surface may be partially inclined, or inclined surfaces with different inclination angles may be combined, the ventilation portion may be a groove-shaped ventilation portion with a horizontal bottom surface, or the ventilation portion may be a groove-shaped ventilation portion with a sloped bottom surface and rising portions formed on both ends. [Explanation of symbols]

[0054] 1. Eaves ventilation material 2 Upper plate 3 Lower plate part 4 Connecting plate part 5 Insertion section 6 Drooping part 7 Inclined plate part 8 Thermal expansion material 9. Ventilation 23 Slope 23a Ventilation hole 23b Drain hole 24 Rising part 26 Recess 31 Lower horizontal part (horizontal part) 32 Bit part (slope part) 105 Rough edge 106 Eave ceiling material S Ventilation space S1 space

Claims

1. An eaves ventilation material including 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.

2. 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.

3. The upper plate portion has a ventilation portion which extends outward from a connection position with the upper end of the connecting plate portion in the extending direction of the horizontal portion beyond the end of the horizontal portion opposite the insertion portion, and has a ventilation hole formed therein penetrating in the thickness direction, The ventilation section faces the horizontal section across a ventilation space, The lower plate portion further includes a hanging portion that extends downward from a lower surface of the upper plate portion and faces 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.

4. The eaves ventilation material according to claim 3, further comprising a thermal expansion material disposed in the ventilation space.

5. 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.

6. The ventilation section has a slope section extending obliquely 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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