Ventilation structure and building in corners

Abstract

To provide a ventilation structure for an inside corner and a building that can share a trim material. [Solution] A trimming material (20) is arranged at an inside corner (C) where the outdoor surface (10a) of an exterior wall (10) and the underside (11a) of an overhang (11) intersect. The trimming material (20) has a first member (21) and a second member (22). The second member (22) is arranged on the indoor side of the first member (21) with a gap between them. A lower surface member (13) that constitutes the underside (11a) of the overhang (11) is sandwiched between the first member (21) and the second member (22). An inside corner ventilation passage (R20) is defined by the first member (21) and the second member (22). The first member (21) is provided with a first communication hole (24a) that connects the outdoors with the inside corner ventilation passage (R20), and a restricting portion (28) that restricts water from entering the inside corner ventilation passage (R20) from the outdoors through the first communication hole (24a).

Description

[Technical Field]

[0001] The present disclosure relates to a ventilation structure and a building for an inside corner. [Background technology]

[0002] The building described in Patent Document 1 has an inside corner where an exterior wall and a soffit board intersect. The upper surface of the exterior wall material of the exterior wall is located below the underside of the soffit board. In other words, the inside corner is fitted so that the soffit board dominates and the exterior wall material does not. An attic ventilation fitting is placed in the inside corner. The attic ventilation fitting has an upper plate located above the soffit board, a lower plate located below the soffit board, and a connection part connecting the upper and lower plates. The attic ventilation fitting is placed so that the soffit board is sandwiched between the upper and lower plates. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-146570 Summary of the Invention [Problem to be solved by the invention]

[0004] There are several thicknesses of soffit boards depending on the soffit specifications, so it is necessary to prepare several types of attic ventilation fittings to match the thickness of the soffit boards. [Means for solving the problem]

[0005] (1) A ventilation structure for an inside corner that solves the above-mentioned problem is a ventilation structure for an inside corner where the outdoor surface of an exterior wall intersects with the underside of a protrusion that is located above the exterior wall and protrudes outdoors beyond the exterior wall, wherein at the inside corner, the upper surface of the exterior wall material of the exterior wall is located below the underside of the underside member of the protrusion, and a trim material is arranged at the inside corner, the trim material having a first member and a second member that is spaced apart from the first member and is arranged on the indoor side of the first member, and the underside member is sandwiched between the first member and the second member, and an inside corner ventilation passage is defined by the first member and the second member, and the first member is provided with a first communication hole that connects the outdoors with the inside corner ventilation passage, and a regulating part that regulates water from entering the inside corner ventilation passage from the outdoors through the first communication hole.

[0006] According to this configuration, the trim is divided into two parts, a first member and a second member, and by setting the distance between the first member and the second member according to the thickness of the lower surface member, the trim can be made standardized for multiple types of lower surface members with different thicknesses. Furthermore, since the first member is provided with the restricting portion, water is less likely to enter the inside corner ventilation passage from the outdoors through the first communication hole.

[0007] (2) In the ventilation structure for an inside corner of the above (1), the second member is provided with a second communication hole that connects the inside corner ventilation passage with the attic. With this configuration, the attic is connected to the outdoors via the inside corner ventilation passage, ensuring ventilation in the attic.

[0008] (3) In the ventilation structure of the inside corner of (1) or (2) above, an inside-wall ventilation layer is provided on the indoor side of the exterior wall material, and the first member has a first horizontal plate portion arranged on the underside of the bottom member and a first vertical plate portion extending downward from the indoor-side end of the first horizontal plate portion, and the second member has a second horizontal plate portion arranged on the upper surface of the bottom member and a second vertical plate portion extending downward from the indoor-side end of the second horizontal plate portion and located on the indoor side of the first vertical plate portion, and the inside-corner ventilation passage has a horizontal passage defined by the first horizontal plate portion and the second horizontal plate portion, and a vertical passage defined by the first vertical plate portion and the second vertical plate portion, and the vertical passage is connected to the inside-wall ventilation layer. According to this configuration, the ventilation layer inside the exterior wall is connected to the outdoors via the inside corner ventilation passage, so ventilation of the ventilation layer inside the exterior wall can be ensured.

[0009] (4) In the ventilation structure of the inside corner portion of (3) above, the first communication hole is provided in the first horizontal plate portion, and the first member is provided with a dam portion protruding upward from a portion of the first horizontal plate portion that is located on the indoor side of the first communication hole.

[0010] With this configuration, even if water seeps into the horizontal passage of the inside corner ventilation passage from the first communication hole, the intruding water is blocked by the weir portion, making it difficult for the water to seep into the vertical passage. Therefore, water is difficult to seep into the ventilation layer inside the exterior wall that is connected to the vertical passage.

[0011] (5) In the ventilation structure of the inside corner of (3) or (4) above, when the horizontal direction in which the protruding portion protrudes relative to the exterior wall is defined as a first direction and the direction perpendicular to the first direction is defined as a second direction, multiple base materials are arranged at intervals in the second direction, and the trim material has a spacer arranged between the first vertical plate portion and the second vertical plate portion, and the spacer is arranged at the position in the second direction where the base material is provided.

[0012] With this configuration, the size of the vertical passage in the first direction can be set to a desired size simply by placing a spacer between the first vertical plate portion and the second vertical plate portion. In addition, because the vertical passage is not blocked by the spacer, ventilation of the ventilation layer inside the outer wall can be ensured.

[0013] (6) In the ventilation structure of the inside corner portion of (5) above, the trim material is fixed to the base material by a fixing member that penetrates the first vertical plate portion, the spacer, and the second vertical plate portion, and the first vertical plate portion has an insertion hole through which the fixing member is inserted, and the insertion hole is a long hole extending in the vertical direction.

[0014] As described above, the distance between the first member and the second member is set according to the thickness of the lower surface member, so the vertical position of the fixing member that penetrates the first vertical plate portion varies for each parting material. According to the above configuration, since the insertion hole is an elongated hole that extends in the vertical direction, the fixing member can be inserted into the insertion hole even if the vertical position of the fixing member varies for each parting material.

[0015] (7) In the ventilation structure for a corner portion of any one of (3) to (6) above, the first communication hole is provided in the first horizontal plate portion, and the regulating portion is constituted by a valve body that operates to close the first communication hole by wind pressure. According to this configuration, in the event of a rainstorm, the first communication hole is closed by the valve body, thereby more effectively preventing rainwater from entering the inside corner ventilation passage through the first communication hole.

[0016] (8) In the ventilation structure for an inside corner of (7) above, the valve body is rotatably attached to a portion of the first horizontal plate portion that is located outside of the first communication hole. According to this configuration, the valve element rotates due to the wind pressure of the wind flowing from the outdoor side toward the indoor side, thereby closing the first communication hole.

[0017] (9) In the ventilation structure for an inside corner of (7) above, the valve body is rotatably attached to a portion of the first horizontal plate portion that is located closer to the indoor side than the first communication hole.

[0018] The wind flowing from the outdoor side toward the indoor side hits the outdoor surface of the first vertical plate portion and turns back. With the above configuration, the valve body rotates due to the wind pressure of the turned back wind, thereby closing the first communication hole.

[0019] (10) In the ventilation structure for an inside corner of (9) above, a guide portion that guides air toward the valve body is provided on the outdoor surface of the first vertical plate portion. With this configuration, when wind strikes the outdoor surface of the first vertical plate portion and turns back, it is guided by the guide portion toward the valve body, thereby allowing the valve body to rotate efficiently.

[0020] (11) A building that solves the above problem has a ventilation structure for an inside corner of any one of (1) to (10) above. According to this configuration, the trim is divided into two parts, a first member and a second member, and by setting the distance between the first member and the second member according to the thickness of the lower surface member, the trim can be made standardized for multiple types of lower surface members with different thicknesses.

[0021] Furthermore, since the first member is provided with the restricting portion, water is less likely to enter the inside corner ventilation passage from the outdoors through the first communication hole. [Effects of the Invention]

[0022] According to the ventilation structure and building of the inside corner of the present disclosure, trim materials can be standardized. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a schematic diagram of a building. [Figure 2] FIG. 1 is a cross-sectional view of an inside corner of a building. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] 5 is a cross-sectional view of the outer wall taken along line 5-5 in FIG. 2. [Figure 6] FIG. 10 is a cross-sectional view of a trim material in a modified example. [Figure 7] FIG. 10 is a cross-sectional view of a trim material in a modified example. [Figure 8] FIG. 10 is a bottom view of the first member in the modified example. [Figure 9] FIG. 10 is a cross-sectional view of a trim material in a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0024] 1 to 5, the ventilation structure for an inside corner C and a building 100 of this embodiment will be described. The building 100 of this embodiment is a two-story house. As shown in FIG. 1, the building 100 includes an exterior wall 10 and a protruding portion 11 that is located above the exterior wall 10 and protrudes further outdoors than the exterior wall 10. In this embodiment, the exterior wall 10 is an exterior wall on the first floor of the building 100. The protruding portion 11 is part of the second floor of the building 100. Among the horizontal directions, the direction in which the protruding portion 11 protrudes from the exterior wall 10 is defined as a first direction D1, and the direction perpendicular to the first direction D1 is defined as a second direction D2.

[0025] As shown in Fig. 2, the overhanging portion 11 has a truss 12 and a bottom surface member 13. A plurality of trusses 12 are arranged at intervals in the second direction D2. The bottom surface member 13 is located below the truss 12. A bottom surface 13a of the bottom surface member 13 forms the bottom surface 11a of the overhanging portion 11.

[0026] The exterior wall 10 has an exterior wall material 14, a base panel 15, and a base post 16. The base panel 15 is provided on the indoor side of the exterior wall material 14. An exterior wall internal ventilation layer R11 is provided between the exterior wall material 14 and the base panel 15. Therefore, the exterior wall internal ventilation layer R11 is provided on the indoor side of the exterior wall material 14. The base post 16 is provided on the indoor side of the base panel 15. A plurality of base posts 16 are arranged at intervals in the second direction D2 (see FIG. 5).

[0027] The building 100 has an inside corner C where the outdoor surface 10a of the exterior wall 10 intersects with the underside 11a of the overhang 11. The outdoor surface 10a of the exterior wall 10 is formed by the outdoor surface 14a of the exterior wall material 14. At the inside corner C, the upper surface 14c of the exterior wall material 14 is located lower than the underside 11a of the overhang 11. In other words, the inside corner C is fitted so that the lower surface member 13 is higher than the exterior wall material 14. Note that "the upper surface 14c of the exterior wall material 14 is located lower than the underside 11a of the overhang 11" refers not only to the case where the upper surface 14c of the exterior wall material 14 is located directly below the underside 11a of the overhang 11, but also to the case where the upper surface 14c of the exterior wall material 14 is located lower than the underside 11a of the overhang 11 when viewed from the first direction D1, as in this embodiment.

[0028] <Cutting material> A parting material 20 is arranged at the inside corner C. The parting material 20 has a first member 21, a second member 22, and a spacer 23. The first member 21 has a flat first horizontal plate portion 24 and a flat first vertical plate portion 25. The first vertical plate portion 25 is perpendicular to the first horizontal plate portion 24. The second member 22 has a flat second horizontal plate portion 26 and a flat second vertical plate portion 27. The second vertical plate portion 27 is perpendicular to the second horizontal plate portion 26.

[0029] The trim 20 is arranged so that the lower surface member 13 is sandwiched between the first horizontal plate portion 24 and the second horizontal plate portion 26, and the first vertical plate portion 25 and the second vertical plate portion 27 are located in the exterior wall internal ventilation layer R11. The second member 22 is arranged on the indoor side of the first member 21 with a gap therebetween.

[0030] Specifically, the first horizontal plate portion 24 is disposed on the lower surface 13a of the lower surface member 13. The first horizontal plate portion 24 extends horizontally. A portion of the upper surface of the first horizontal plate portion 24, which is located at the outdoor end of the first horizontal plate portion 24, contacts a portion of the lower surface 13a of the lower surface member 13, which is located at the indoor end of the lower surface member 13. In this embodiment, a gap G exists between the portion of the lower surface of the first horizontal plate portion 24, which is located on the indoor side of the first horizontal plate portion 24, and the upper surface 14c of the exterior building material 14. The first vertical plate portion 25 extends downward from the indoor end of the first horizontal plate portion 24. The first vertical plate portion 25 is disposed in the exterior-wall ventilation layer R11. The outdoor surface of the first vertical plate portion 25 contacts the indoor surface 14b of the exterior building material 14.

[0031] The second horizontal plate portion 26 is disposed on the upper surface 13b of the lower surface member 13. The second horizontal plate portion 26 extends horizontally. A portion of the lower surface of the second horizontal plate portion 26 that is located at the outdoor end of the second horizontal plate portion 26 contacts a portion of the upper surface 13b of the lower surface member 13 that is located at the indoor end of the lower surface member 13. The second vertical plate portion 27 extends downward from the indoor end of the second horizontal plate portion 26. The second vertical plate portion 27 is disposed in the exterior wall internal ventilation layer R11. The second vertical plate portion 27 is disposed closer to the indoor side than the first vertical plate portion 25. The indoor surface of the second vertical plate portion 27 contacts the base panel 15.

[0032] The first member 21 and the second member 22 define an inside corner ventilation passage R20. The inside corner ventilation passage R20 includes a horizontal passage R20a defined by the first horizontal plate portion 24 and the second horizontal plate portion 26, and a vertical passage R20b defined by the first vertical plate portion 25 and the second vertical plate portion 27. As described above, the indoor end of the bottom member 13 is sandwiched between the outdoor end of the first horizontal plate portion 24 and the outdoor end of the second horizontal plate portion 26. Therefore, the first end of the inside corner ventilation passage R20 is closed by the bottom member 13. The second end of the inside corner ventilation passage R20, which is the end opposite to the first end, is connected to the exterior-wall ventilation layer R11.

[0033] As shown in Figures 2 and 3, a first communication hole 24a is provided in the first horizontal plate portion 24 of the first member 21. The first communication hole 24a penetrates the first horizontal plate portion 24 in the thickness direction. In this embodiment, the first communication hole 24a is rectangular in plan view. In this embodiment, two first communication holes 24a are provided spaced apart in the second direction D2. The outside and the inside corner ventilation passage R20 are connected via the first communication hole 24a.

[0034] The first horizontal plate portion 24 of the first member 21 is provided with a restricting portion 28 that restricts water from entering the inside corner ventilation passage R20 from the outdoors through the first communication hole 24a. In this embodiment, the restricting portion 28 is configured as a rectangular plate. The restricting portion 28 covers the first communication hole 24a from below so as not to completely block the first communication hole 24a. Specifically, the restricting portion 28 is attached to a portion of the first horizontal plate portion 24 that is located closer to the outdoors than the first communication hole 24a. The restricting portion 28 is inclined so as to move away from the first communication hole 24a as it approaches the indoor side. The inclination angle of the restricting portion 28 relative to the first horizontal plate portion 24 shown in FIG. 2 is an example. The inclination angle of the restricting portion 28 relative to the first horizontal plate portion 24 may be changed as appropriate.

[0035] The first member 21 is provided with a dam portion 29 that protrudes upward from a portion of the first horizontal plate portion 24 that is located closer to the indoor side than the first communication hole 24a. In this embodiment, the dam portion 29 protrudes upward from the indoor-side end of the first horizontal plate portion 24.

[0036] As shown in Figures 2 and 4, a second communication hole 26a is provided in the second horizontal plate portion 26 of the second member 22. The second communication hole 26a penetrates the second horizontal plate portion 26 in the thickness direction. In this embodiment, the second communication hole 26a is rectangular in plan view. In this embodiment, two second communication holes 26a are provided spaced apart in the second direction D2. The inside corner ventilation passage R20 and the attic R12 are in communication with each other via the second communication hole 26a.

[0037] 2 and 5, the spacer 23 is disposed between the first vertical plate portion 25 and the second vertical plate portion 27. The spacer 23 is disposed at an interval in the second direction D2. More specifically, the spacer 23 is disposed at a position in the second direction D2 where the base post 16 is provided. That is, the spacer 23 is disposed so as to be aligned with the base post 16 in the first direction D1 via the base panel 15.

[0038] The trim 20 is fixed to the base post 16 by fixing members 17 such as screws or nails. The fixing members 17 penetrate the first vertical plate portion 25, the spacer 23, the second vertical plate portion 27, and the base panel 15.

[0039] 2 and 3, the first vertical plate portion 25 of the first member 21 has an insertion hole 25a through which the fixing member 17 is inserted. The insertion hole 25a is an elongated hole extending in the vertical direction. The insertion hole 25a is disposed at a position in the second direction D2 where the spacer 23 is provided. In this embodiment, two insertion holes 25a are provided spaced apart in the second direction D2.

[0040] The first member 21, the second member 22, and the spacer 23 are integrated into a parting material 20 before being fixed to the base column 16 by the fixing member 17. Specifically, the first member 21 and the second member 22 are temporarily fixed to the spacer 23 with the bottom member 13 sandwiched between the first horizontal plate portion 24 and the second horizontal plate portion 26 and the spacer 23 sandwiched between the first vertical plate portion 25 and the second vertical plate portion 27. The distance between the first horizontal plate portion 24 and the second horizontal plate portion 26, i.e., the dimension of the horizontal passage R20a in the up-down direction, is determined by the thickness of the bottom member 13. The distance between the first vertical plate portion 25 and the second vertical plate portion 27, i.e., the dimension of the vertical passage R20b in the first direction D1, is determined by the thickness of the spacer 23.

[0041] [Operation of this embodiment] The operation of this embodiment will be described. A trimming material 20 is arranged at the inside corner C. The trimming material 20 has a first member 21 and a second member 22. The second member 22 is arranged on the indoor side of the first member 21 with a gap therebetween. The lower member 13 is sandwiched between the first member 21 and the second member 22.

[0042] According to this configuration, the trim material 20 is divided into two parts, the first member 21 and the second member 22, and by setting the distance between the first member 21 and the second member 22 according to the thickness of the lower surface member 13, the trim material 20 can be made common to multiple types of lower surface members 13 with different thicknesses.

[0043] The first member 21 and the second member 22 define an inside corner ventilation passage R20. The first member 21 has a first communication hole 24a that connects the inside corner ventilation passage R20 to the outdoors. The second member 22 has a second communication hole 26a that connects the inside corner ventilation passage R20 to the attic R12. As a result, as shown by the solid arrow in FIG. 2, the attic R12 is connected to the outdoors via the inside corner ventilation passage R20, ensuring ventilation for the attic R12. Furthermore, the inside corner ventilation passage R20 is connected to the exterior wall ventilation layer R11. As shown by the solid arrow in FIG. 2, the exterior wall ventilation layer R11 is connected to the outdoors via the inside corner ventilation passage R20, ensuring ventilation for the exterior wall ventilation layer R11.

[0044] The first member 21 is provided with a restricting portion 28 that restricts water from entering the inside corner ventilation passage R20 from the outdoors through the first communication hole 24a. In this embodiment, the restricting portion 28 covers the first communication hole 24a from below so as not to completely block the first communication hole 24a. Specifically, the restricting portion 28 is attached to a portion of the first horizontal plate portion 24 that is positioned closer to the outdoors than the first communication hole 24a. The restricting portion 28 is inclined so as to move away from the first communication hole 24a as it moves toward the indoor side.

[0045] This configuration ensures ventilation of the inside corner ventilation passage R20 even with the restriction portion 28. Furthermore, as shown by the dashed-dotted arrow in Figure 2, in the event of a rainstorm, rainwater collides with the restriction portion 28, preventing water from entering the inside corner ventilation passage R20 from the outdoors via the first communication hole 24a.

[0046] [Effects of this embodiment] The effects of this embodiment will be described. (1) Since the trim material 20 is divided into two parts, the first member 21 and the second member 22, by setting the distance between the first member 21 and the second member 22 according to the thickness of the lower surface member 13, the trim material 20 can be made common to multiple types of lower surface members 13 with different thicknesses.

[0047] Furthermore, since the first member 21 is provided with the restricting portion 28, water is less likely to enter the inside corner ventilation passage R20 from the outdoors through the first communication hole 24a. (2) The second member 22 is provided with a second communication hole 26a that connects the inside corner ventilation passage R20 and the attic R12. According to this configuration, the attic R12 is connected to the outdoors via the inside corner ventilation passage R20, ensuring ventilation of the attic R12.

[0048] (3) An exterior-wall internal ventilation layer R11 is provided on the indoor side of the exterior wall material 14. The first member 21 has a first horizontal plate portion 24 and a first vertical plate portion 25. The first horizontal plate portion 24 is disposed on the lower surface 13a of the lower surface member 13. The first vertical plate portion 25 extends downward from the indoor-side end of the first horizontal plate portion 24. The second member 22 has a second horizontal plate portion 26 and a second vertical plate portion 27. The second horizontal plate portion 26 is disposed on the upper surface 13b of the lower surface member 13. The second vertical plate portion 27 extends downward from the indoor-side end of the second horizontal plate portion 26. The second vertical plate portion 27 is located indoors of the first vertical plate portion 25.

[0049] The inside corner ventilation passage R20 has a horizontal passage R20a and a vertical passage R20b. The horizontal passage R20a is defined by a first horizontal plate portion 24 and a second horizontal plate portion 26. The vertical passage R20b is defined by a first vertical plate portion 25 and a second vertical plate portion 27. The vertical passage R20b is connected to the external wall ventilation layer R11.

[0050] According to this configuration, the ventilation layer R11 in the exterior wall is connected to the outdoors via the inside corner ventilation passage R20, so ventilation of the ventilation layer R11 in the exterior wall can be ensured. (4) The first communication hole 24a is provided in the first horizontal plate portion 24. The first member 21 is provided with a dam portion 29 that protrudes upward from a portion of the first horizontal plate portion 24 that is located closer to the indoor side than the first communication hole 24a.

[0051] According to this configuration, even if water infiltrates the horizontal passage R20a of the inside corner ventilation passage R20 from the first communication hole 24a, the infiltrating water is less likely to infiltrate the vertical passage R20b because it is blocked by the dam portion 29. Therefore, water is less likely to infiltrate the outer-wall ventilation layer R11 connected to the vertical passage R20b.

[0052] (5) The parting material 20 has a spacer 23 arranged between the first vertical plate portion 25 and the second vertical plate portion 27. The spacer 23 is arranged at a position where the base post 16 is provided in the second direction D2.

[0053] According to this configuration, the dimension of the vertical passage R20b in the first direction D1 can be set to a desired dimension simply by disposing the spacer 23 between the first vertical plate portion 25 and the second vertical plate portion 27. Furthermore, since the vertical passage R20b is not blocked by the spacer 23, ventilation of the outer-wall interior ventilation layer R11 can be ensured.

[0054] (6) The trim 20 is fixed to the base post 16 by a fixing member 17 that penetrates the first vertical plate portion 25, the spacer 23, and the second vertical plate portion 27. The first vertical plate portion 25 has an insertion hole 25a through which the fixing member 17 is inserted. The insertion hole 25a is a long hole that extends in the vertical direction.

[0055] As described above, the distance between the first member 21 and the second member 22 is set depending on the thickness of the lower surface member 13, and therefore the vertical position of the fixing member 17 that penetrates the first vertical plate portion 25 also differs for each parting material 20. Because the insertion hole 25a is an elongated hole that extends in the vertical direction, even if the position of the fixing member 17 in the vertical direction differs for each parting material 20, the fixing member 17 can be inserted into the insertion hole 25a.

[0056] (7) In order to ensure the durability of the building frame 100, it is necessary to ensure ventilation in the attic R12 and the ventilation layer R11 in the exterior wall. On the other hand, if water infiltrates the attic R12 and the ventilation layer R11 in the exterior wall together with air, it will cause the building frame 100 to rot, so it is necessary to prevent water from infiltrating the attic R12 and the ventilation layer R11 in the exterior wall.

[0057] In this embodiment, ventilation is ensured between the attic space R12 and the external wall ventilation layer R11 through the inside corner ventilation passage R20. Furthermore, since the restricting portion 28 restricts water from entering the inside corner ventilation passage R20, water is less likely to enter the attic space R12 and the external wall ventilation layer R11 connected to the inside corner ventilation passage R20. Therefore, ventilation between the attic space R12 and the external wall ventilation layer R11 can be ensured while restricting water from entering the attic space R12 and the external wall ventilation layer R11.

[0058] (8) The following example is considered as a reference technique for the ventilation structure of the inside corner C. The trim has an upper plate located above the bottom member 13, a lower plate located below the bottom member 13, and a connecting portion that vertically connects the indoor end of the upper plate to the indoor end of the lower plate. In this case, if there is a gap between the lower plate of the trim and the upper surface 14c of the exterior building material 14, there is a risk of water entering the interior through the gap. For this reason, it is possible to consider, for example, sealing the gap between the lower plate of the trim and the upper surface 14c of the exterior building material 14, or butting the lower surface of the lower plate against the upper surface 14c of the exterior building material 14.

[0059] However, when sealing between the lower plate and the exterior wall material 14, the ventilation layer R11 inside the exterior wall may be blocked by the sealing material or the backup material for sealing, which may impair ventilation of the ventilation layer R11 inside the exterior wall. Also, if the exterior wall material 14 is thin, sealing itself is difficult.

[0060] Installation is difficult when the lower plate and the exterior wall material 14 are butted together. Furthermore, when the fit of the inside corner C is such that the bottom member 13 wins and the exterior wall material 14 loses, the exterior wall material 14 is installed after the installation of the bottom member 13 and the trim. The exterior wall material 14 is installed, for example, by being inserted into an exterior wall material support member (not shown) from above so that it rests on the support member. In this case, if the lower plate and the exterior wall material 14 are butted together, the upper end of the exterior wall material 14 interferes with the trim that has already been installed, making it impossible to install the exterior wall material 14.

[0061] In contrast, in this embodiment, the first vertical plate portion 25 of the first member 21 is positioned so as to contact the indoor surface 14b of the exterior building material 14. This makes it possible to omit sealing between the first horizontal plate portion 24 of the first member 21 and the upper surface 14c of the exterior building material 14. Furthermore, because it is not necessary to butt the first horizontal plate portion 24 and the upper surface 14c of the exterior building material 14, i.e., because a gap G may exist between the first horizontal plate portion 24 and the exterior building material 14, installation of the exterior building material 14 is easier and the exterior building material 14 can be installed by inserting it into the exterior building material support member from above.

[0062] <Example of change> The above-described embodiment is an example of the possible forms of the ventilation structure for the inside corner C and the building 100, and is not intended to limit the forms. The ventilation structure for the inside corner C and the building 100 may take forms different from those illustrated in the above-described embodiment. Examples of such forms include forms in which part of the configuration of the embodiment is replaced, modified, or omitted, or forms in which a new configuration is added to the embodiment. Modified examples of the embodiment are shown below.

[0063] The inside corner ventilation passage R20 may be connected to only one of the attic space R12 and the external wall ventilation layer R11. If ventilation of the attic space R12 is not required, the second communication hole 26a may not be provided in the second horizontal plate portion 26 of the second member 22. If ventilation of the external wall ventilation layer R11 is not required, the inside corner ventilation passage R20 may not be connected to the external wall ventilation layer R11. Even in this case, at least the effect (1) of the above embodiment can be obtained.

[0064] The number of first communication holes 24a provided in the first horizontal plate portion 24 of the first member 21 is not limited to two and may be changed as appropriate. The number of second communication holes 26a provided in the second horizontal plate portion 26 of the second member 22 is not limited to two and may be changed as appropriate.

[0065] The dam portion 29 of the first member 21 may be omitted. Even in this case, at least the effect (1) of the above embodiment can be obtained. The dam portion 29 does not have to be located at the indoor end of the first horizontal plate portion 24, as long as it protrudes upward from a portion of the first horizontal plate portion 24 that is located closer to the indoor side than the first communication hole 24a.

[0066] The insertion hole 25a of the first member 21 does not have to be an elongated hole extending in the vertical direction. Even in this case, at least the effect (1) of the above embodiment can be obtained. As in a first modified example shown in Fig. 6 and a second modified example shown in Figs. 7 to 9, the restricting portion 28 may be configured with a valve body 30 that operates to close the first communication hole 24a due to wind pressure. With this configuration, in the event of a rainstorm, the first communication hole 24a is closed by the valve body 30, thereby more effectively restricting rainwater from entering the inside corner ventilation passage R20 through the first communication hole 24a. The first and second modified examples will be described in detail below.

[0067] [First change example] As shown in FIG. 6, the valve body 30 of the first modified example is rotatably attached via a hinge 33 to a portion of the first horizontal plate portion 24 that is located closer to the exterior than the first communication hole 24a.

[0068] When there is no wind, as shown by the solid line in Figure 6, the valve body 30 covers the first communication hole 24a from below so as not to completely block the first communication hole 24a. Specifically, the valve body 30 is inclined so as to move away from the first communication hole 24a as it moves toward the indoor side. This ensures ventilation of the inside corner ventilation passage R20 while preventing water from entering the inside corner ventilation passage R20 from the outdoors via the first communication hole 24a.

[0069] When wind flows from the outdoors toward the indoors, the underside of the valve element 30 is subjected to wind pressure. This causes a force to act on the valve element 30, rotating it toward the first communication hole 24a, i.e., in a direction that closes the first communication hole 24a. In the case of a rainstorm, the wind pressure is strong, so the valve element 30 completely closes the first communication hole 24a, as shown by the two-dot chain line in Figure 6. This effectively prevents rainwater from entering the inside corner ventilation passage R20 through the first communication hole 24a during a rainstorm.

[0070] [Second modification example] 7, the valve body 30 of the second modified example has a first plate 31 and a second plate 32 that is perpendicular to the first plate 31. A through hole 31a is provided in the first plate 31. The intersection of the first plate 31 and the second plate 32 is rotatably attached via a hinge 33 to a portion of the first horizontal plate portion 24 that is located on the indoor side of the first communication hole 24a.

[0071] As shown in Fig. 8, a guide portion 40 that guides airflow toward the valve body 30 is provided on the outdoor surface 25b of the first vertical plate portion 25. The guide portion 40 is located in the gap G between the lower surface of the first horizontal plate portion 24 and the upper surface 14c of the exterior building material 14 (see Fig. 7).

[0072] The guide portion 40 has, for example, a first wall portion 41 and two second wall portions 42. The first wall portion 41 is disposed at a position in the second direction D2 where the valve body 30 is provided. The first wall portion 41 is aligned with the valve body 30 in the first direction D1. The first wall portion 41 has two curved plates 41a. The two curved plates 41a are aligned in the second direction D2. The two curved plates 41a are curved so as to move away from the outdoor surface 25b of the first vertical plate portion 25 as they approach each other. The two second wall portions 42 are located on both sides of the first wall portion 41 in the second direction D2. Each second wall portion 42 is curved so as to move closer to the outdoor surface 25b of the first vertical plate portion 25 as it moves toward the first wall portion 41. The curved surface 40a recessed toward the indoor side is formed by the curved plate 41a, the first vertical plate portion 25, and the second wall portion .

[0073] Gravity acting on the valve element 30 causes a force to act on the valve element 30, causing the valve element 30 to rotate in a direction in which the second plate 32 moves away from the first communication hole 24a. As shown in Figure 7, when there is no wind, the first plate 31 of the valve body 30 is located within the first communication hole 24a of the first horizontal plate portion 24. The first plate 31 is supported by a support portion (not shown) so that it is not located below the first horizontal plate portion 24. At this time, the second plate 32 of the valve body 30 is located below the first horizontal plate portion 24 and is perpendicular to the first horizontal plate portion 24. In this state, the through hole 31a of the first plate 31 ensures ventilation of the inside corner ventilation passage R20.

[0074] As shown in Figure 8, when wind flows from the outdoor side toward the indoor side, the wind flowing from the outdoor side toward the indoor side on both sides of the first communication hole 24a collides with the outdoor-side surface 25b of the first vertical plate portion 25 and turns back. The indoor-side surface of the second plate 32 receives wind pressure from the turned-back wind. As a result, a force acts on the valve element 30 to rotate the second plate 32 in a direction toward the first communication hole 24a, i.e., in a direction that closes the first communication hole 24a. When the force rotating the valve element 30 due to the wind pressure exceeds the force rotating the valve element 30 due to gravity, the valve element 30 rotates in the direction toward the second plate 32 toward the first communication hole 24a.

[0075] 9, in the event of a rainstorm, the wind pressure is so great that the second plate 32 completely closes the first communication hole 24a of the first horizontal plate portion 24. This further prevents rainwater from entering the inside corner ventilation passage R20 through the first communication hole 24a in the event of a rainstorm.

[0076] As described above, the guide portion 40 is provided on the outdoor surface 25b of the first vertical plate portion 25. Therefore, when wind strikes the outdoor surface 25b of the first vertical plate portion 25 and turns back, it is guided by the guide portion 40 toward the valve body 30. More specifically, as shown by the arrows in FIG. 8, wind flowing from the outdoor side toward the indoor side on both sides of the first communication hole 24a flows along the curved surface 40a and is guided toward the valve body 30. This allows the valve body 30 to rotate efficiently.

[0077] In the second modified example, the guide portion 40 may be omitted. In the above embodiment, the building 100 is a residential building, but it does not have to be a residential building. In the above embodiment, the exterior wall 10 is an exterior wall of the first floor, and the protruding portion 11 is part of the second floor, but this is not limiting. For example, if the building 100 is three stories tall, the exterior wall 10 may be an exterior wall of the second floor, and the protruding portion 11 may be part of the third floor.

[0078] The overhanging portion 11 may be an eave, and the lower surface member 13 may be an under-eaves member. <Additional Notes> This specification discloses the following techniques:

[0079] [Appendix 1] A ventilation structure for an inside corner where the outdoor surface of an exterior wall intersects with the underside of a protrusion that is located above the exterior wall and protrudes outdoors beyond the exterior wall, wherein at the inside corner, the upper surface of the exterior wall material of the exterior wall is located below the underside of the underside member of the protrusion, and a trim material is provided that is arranged at the inside corner, the trim material having a first member and a second member that is spaced apart from the first member and is arranged on the indoor side of the first member, an inside corner ventilation passage is defined by the first member and the second member, and the first member is provided with a first communication hole that connects the outdoors with the inside corner ventilation passage, and a restriction part that restricts water from entering the inside corner ventilation passage from the outdoors through the first communication hole.

[0080] [Appendix 2] In the ventilation structure for an inside corner described in Supplementary Note 1, the second member is provided with a second communication hole that connects the inside corner ventilation passage with the attic.

[0081] [Appendix 3] In the ventilation structure for an inside corner described in Appendix 1, an exterior wall ventilation layer is provided on the indoor side of the exterior wall material, the first member has a first horizontal plate portion arranged on the underside of the bottom member and a first vertical plate portion extending downward from the indoor side end of the first horizontal plate portion, the second member has a second horizontal plate portion arranged on the upper surface of the bottom member and a second vertical plate portion extending downward from the indoor side end of the second horizontal plate portion and located on the indoor side of the first vertical plate portion, and the inside corner ventilation passage has a horizontal passage defined by the first horizontal plate portion and the second horizontal plate portion, and a vertical passage defined by the first vertical plate portion and the second vertical plate portion, and the vertical passage is connected to the exterior wall ventilation layer.

[0082] [Appendix 4] In the ventilation structure for a corner described in Appendix 3, the first communication hole is provided in the first horizontal plate portion, and the first member is provided with a dam portion that protrudes upward from a portion of the first horizontal plate portion that is located on the indoor side of the first communication hole.

[0083] [Appendix 5] In the ventilation structure of the inside corner described in Appendix 3, when the horizontal direction in which the protruding portion protrudes relative to the exterior wall is defined as a first direction and the direction perpendicular to the first direction is defined as a second direction, multiple base materials are arranged at intervals in the second direction, and the trim material has a spacer arranged between the first vertical plate portion and the second vertical plate portion, and the spacer is arranged at the position in the second direction where the base material is provided.

[0084] [Appendix 6] In the ventilation structure of the inside corner described in Appendix 5, the trim material is fixed to the base material by a fixing member that penetrates the first vertical plate portion, the spacer, and the second vertical plate portion, and the first vertical plate portion has an insertion hole through which the fixing member is inserted, and the insertion hole is a long hole that extends in the vertical direction.

[0085] [Appendix 7] In the ventilation structure for a corner described in Appendix 3, the first communication hole is provided in the first horizontal plate portion, and the regulating portion is constituted by a valve body that operates to close the first communication hole by wind pressure.

[0086] [Appendix 8] In the ventilation structure for an inside corner described in Supplementary Note 7, the valve body is rotatably attached to a portion of the first horizontal plate portion that is located on the outdoor side of the first communication hole.

[0087] [Appendix 9] In the ventilation structure for an inside corner described in Supplementary Note 7, the valve body is rotatably attached to a portion of the first horizontal plate portion that is located closer to the indoor side than the first communication hole.

[0088] [Appendix 10] In the ventilation structure for an inside corner described in Supplementary Note 9, a guide portion that guides airflow toward the valve body is provided on an outdoor surface of the first vertical plate portion.

[0089] [Appendix 11] A building having a ventilation structure for an inside corner described in any one of appendices 1 to 10. [Explanation of symbols]

[0090] 10...exterior wall, 10a...exterior surface of exterior wall, 11...extension portion, 11a...underside of extension portion, 13...bottom surface member, 13a...bottom surface of bottom surface member, 13b...top surface of bottom surface member, 14...exterior wall material, 14c...top surface of exterior wall material, 16...base post as base material, 17...fixing member, 20...partition member, 21...first member, 22...second member, 23...spacer, 24...first horizontal plate portion, 24a...first communicating hole, 25 ...First vertical plate portion, 25a...insertion hole, 25b...outdoor surface of first vertical plate portion, 26...second horizontal plate portion, 26a...second communication hole, 27...second vertical plate portion, 28...regulating portion, 29...dam portion, 30...valve body, 40...guide portion, 100...building, C...inner corner portion, R11...ventilation layer inside exterior wall, R12...attic, R20...inner corner ventilation passage, R20a...horizontal passage, R20b...vertical passage, D1...first direction, D2...second direction.

Claims

1. A ventilation structure for an inside corner where an outdoor surface of an exterior wall intersects with a lower surface of a protruding portion located above the exterior wall and protruding outdoors beyond the exterior wall, At the inside corner portion, an upper surface of the exterior wall material of the exterior wall is located lower than a lower surface of a lower surface member of the protruding portion, A parting material is provided to be placed at the inside corner portion, The parting material has a first member and a second member arranged on the indoor side of the first member with a gap therebetween, the lower surface member is sandwiched between the first member and the second member, an inside corner ventilation passage is defined by the first member and the second member, The first member is provided with a first communication hole that connects the outside to the inside corner ventilation passage, and a regulating portion that regulates water from entering the inside corner ventilation passage from the outside through the first communication hole.

2. The ventilation structure for an inside corner according to claim 1, wherein the second member is provided with a second communication hole that connects the inside corner ventilation passage with the attic.

3. An exterior wall ventilation layer is provided on the indoor side of the exterior wall material, The first member has a first horizontal plate portion arranged on the lower surface of the lower surface member and a first vertical plate portion extending downward from an indoor-side end of the first horizontal plate portion, the second member has a second horizontal plate portion disposed on the upper surface of the lower surface member, and a second vertical plate portion extending downward from an indoor end of the second horizontal plate portion and positioned closer to the indoor side than the first vertical plate portion, The inside corner ventilation passage has a horizontal passage defined by the first horizontal plate portion and the second horizontal plate portion, and a vertical passage defined by the first vertical plate portion and the second vertical plate portion, The ventilation structure for an inside corner according to claim 1 , wherein the vertical passage is connected to the ventilation layer inside the exterior wall.

4. the first communication hole is provided in the first horizontal plate portion, The ventilation structure for an inside corner according to claim 3 , wherein the first member is provided with a dam portion that protrudes upward from a portion of the first horizontal plate portion that is located on the indoor side of the first communication hole.

5. When the direction in which the protruding portion protrudes relative to the outer wall in the horizontal direction is defined as a first direction, and the direction perpendicular to the first direction is defined as a second direction, A plurality of base materials are arranged at intervals in the second direction, The parting material has a spacer disposed between the first vertical plate portion and the second vertical plate portion, The ventilation structure for an inside corner according to claim 3 , wherein the spacer is disposed at a position where the base material is provided in the second direction.

6. the parting material is fixed to the base material by a fixing member that penetrates the first vertical plate portion, the spacer, and the second vertical plate portion, The first vertical plate portion is provided with an insertion hole through which the fixing member is inserted, The ventilation structure for an inside corner according to claim 5, wherein the insertion hole is a long hole extending in the vertical direction.

7. the first communication hole is provided in the first horizontal plate portion, The ventilation structure for an inside corner according to claim 3 , wherein the restricting portion is configured by a valve body that operates to close the first communication hole by wind pressure.

8. The ventilation structure for an inside corner according to claim 7 , wherein the valve body is rotatably attached to a portion of the first horizontal plate portion that is located outside of the first communication hole.

9. The ventilation structure for a recessed corner according to claim 7 , wherein the valve body is rotatably attached to a portion of the first horizontal plate portion that is located indoors relative to the first communication hole.

10. The ventilation structure for a recessed corner according to claim 9, wherein a guide portion for guiding air toward the valve body is provided on an outdoor surface of the first vertical plate portion.

11. A building having the ventilation structure for the inside corner according to any one of claims 1 to 10.

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