WO2024157512A1

WO2024157512A1 - Building

Info

Publication number: WO2024157512A1
Application number: PCT/JP2023/030607
Authority: WO
Inventors: 忠雄東; 一聡高橋; 祐輔出端
Original assignee: 積水ハウス株式会社
Priority date: 2023-01-27
Filing date: 2023-08-24
Publication date: 2024-08-02
Also published as: JP2024106724A

Abstract

A building (1) includes: a roofing board (30); an exterior wall panel (46); a roof air passage (3A) disposed along the roofing board (30); an upper wall air passage (4A) on an inside of the exterior wall panel (46); and a restricting part (R). The restricting part (R) is provided so as to connect from an upper surface of the roofing board (30) to a waterproofing sheet (48), and restricts the entering of water to an exterior wall base (G) and the upper surface of the roofing board (30). A panel lower end portion (46S) of the exterior wall panel (46) forms an air intake port. A connection passage (Q) that connects the roof air passage (3A) and the upper wall air passage (4A) is formed on an inside of the restricting part (R).

Description

Building

The present invention relates to a building with a roof structure.

　Conventionally, buildings with a eaves structure are known. The eaves are positioned lower than the roof of the main building and are positioned so as to protrude from the main building.

Patent Document 1 discloses a building with a shed structure as described above. In this building, an air layer is formed that runs from the shed along the exterior wall of the second floor of the main building. The air layer on the shed side is arranged at an angle below the waterproof sheet and sheathing boards. Meanwhile, the air layer on the exterior wall side is arranged further inside the moisture-permeable waterproof sheet, which is further inside the exterior wall. The two air layers thus formed on the inside of the roof and exterior wall are connected to each other at the upper end of the shed. With this structure, air exhausted from the attic of the first floor and shed can be exhausted to the outdoors from the upper end of the exterior wall on the second floor.

JP 2005-83142 A

In the technology described in Patent Document 1, in winter, humid air that flows from the first floor and attic into the ventilation layer on the lower roof side flows into the ventilation layer on the exterior wall side of the second floor. Since humid air also flows into the ventilation layer on the exterior wall side of the second floor from the inside of the room on the second floor, the humidity in the ventilation layer increases and the air flow stagnates, which creates the problem that condensation is more likely to occur in the ventilation layer and in the insulation material adjacent to it.

The object of the present invention is to prevent condensation from occurring in ventilation passages and their surroundings in buildings with a shed structure, while maintaining the waterproof performance around the joints between the shed and the exterior wall.

The present invention provides a building. The building includes a roof having a roof foundation and a roof ventilation passage provided along the roof foundation below the roof foundation, and an exterior wall erected on the end of the roof, the exterior wall having the exterior wall foundation, an exterior wall panel arranged on the outside of the exterior wall foundation, a waterproofing member arranged to extend vertically on the outer surface of the exterior wall foundation and restrict water from entering the exterior wall foundation, and an exterior wall ventilation passage provided along the exterior wall panel toward the upper end of the exterior wall panel between the exterior wall panel and the waterproofing member, and a restricting portion provided so as to connect the upper surface of the roof foundation to the waterproofing member and restricting water from entering the upper surface of the roof foundation and the exterior wall foundation, the exterior wall panel is arranged above the restricting portion at a distance, and has a panel lower end forming an air intake port between the restricting portion and the restricting portion that communicates with the exterior wall ventilation passage, and a connecting passage connecting the roof ventilation passage and the exterior wall ventilation passage is formed inside the restricting portion.

FIG. 1 is a schematic cross-sectional side view of a building according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the upper end portion and surrounding area of a roof of a building according to one embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view of a portion of FIG. FIG. 4A is a horizontal cross-sectional view of the vicinity of a connecting passage of a building according to one embodiment of the present invention. FIG. 4B is a front view of the vicinity of a connecting passage of a building according to one embodiment of the present invention. FIG. 4C is a side cross-sectional view of the vicinity of a connecting passage of a building according to one embodiment of the present invention. FIG. 5A is a front view of an architectural flashing according to one embodiment of the present invention. FIG. 5B is a side view of an architectural flashing according to one embodiment of the present invention. FIG. 6A is a horizontal cross-sectional view of the vicinity of a connecting passage of a building according to a first modified embodiment of the present invention. FIG. 6B is a front view of the vicinity of a connecting passage of a building according to a first modified embodiment of the present invention. FIG. 6C is a side cross-sectional view of the vicinity of a connecting passage of a building according to a first modified embodiment of the present invention. A cross-sectional view of the upper end portion of a building roof according to a second modified embodiment of the present invention.

The building 1 according to each embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional side view of the building 1 according to one embodiment of the present invention. Note that in FIG. 1 and the subsequent figures, the front-back, left-right, and up-down directions are shown as necessary to facilitate explanation, but these directions do not limit the present invention.

As shown in FIG. 1, the building 1 has a lower wall 2, a roof 3, and an upper wall 4. The lower wall 2 is a wall that extends vertically at the front of the building 1. The roof 3 extends upward from the upper end of the lower wall 2 and covers the interior of the building 1. The upper wall 4 is erected so as to extend upward from the upper end (tip) of the roof 3. The roof 3 and the upper wall 4 are connected to each other at a connection part 5. As an example, the interior of the lower wall 2 constitutes the first floor of the building 1. Also, the interior of the upper wall 4 constitutes the second floor of the building 1. In other words, in this embodiment, the roof 3 is positioned lower than the roof of the main house (not shown) and corresponds to a lower house that protrudes from the main house.

As shown in FIG. 1, a lower wall air passage 2A is formed on the inside of the lower wall 2, and an upper wall air passage 4A (exterior wall ventilation passage) is formed on the inside of the upper wall 4. In addition, a roof air passage 3A (roof ventilation passage) is formed on the inside of the roof 3. In this embodiment, air in the lower wall air passage 2A flows into the roof air passage 3A and heads toward the connection portion 5. At the connection portion 5, the air flows into the upper wall air passage 4A. In addition, air flows into the upper wall air passage 4A from the second floor of the building 1. The air in the upper wall air passage 4A is exhausted to the outdoors at the upper end of the upper wall 4. The structure for air flowing from the roof air passage 3A to the upper wall air passage 4A will be described in detail below.

FIG. 2 is a cross-sectional view of the periphery of the connection portion 5 of the building 1, and FIG. 3 is an enlarged cross-sectional view of a portion of FIG. 2. The building 1 includes a sheathing board 30, a heat insulating layer 31, a number of roof tiles 32, and roofing 33.

The sheathing board 30 corresponds to the roof underlayment in this embodiment. The sheathing board 30 is arranged so that it slopes upward toward the upper wall portion 4 (exterior wall). The sheathing board 30 is made of, for example, a wooden board. The roof ventilation channel 3A described above is provided below and along the sheathing board 30.

The insulating layer 31 is arranged at a distance below the sheathing board 30. Although not shown in FIG. 2, the sheathing board 30 is supported by a number of rafter members arranged at a distance in a direction perpendicular to the plane of the paper in FIG. 2. Each rafter member is arranged so that it extends upward along the sheathing board 30. The insulating layer 31 is arranged between adjacent rafter members or up to the lower side of the rafter members. The roof ventilation channel 3A mentioned above is formed between the sheathing board 30 and the insulating layer 31.

Multiple roof tiles 32 are placed on the sheathing board 30. Although two roof tiles 32 are shown in FIG. 2, multiple roof tiles 32 are arranged in a line in the front, back, left and right directions along the roof 3 in FIG. 1. The roof tiles 32 are engaged with battens 32H (FIG. 3) arranged on the sheathing board 30.

The roofing 33 prevents water from entering the inside of the sheathing board 30 and the upper wall portion 4. In this embodiment, a roofing support plate 33S (Figure 3) made of a metal plate is placed on the sheathing board 30 in advance, and the roofing 33 is arranged along the roofing support plate 33S. The roofing 33 and the roofing support plate 33S are arranged so that they bend from the upper end of the sheathing board 30 to the furring strip 54 described below.

An airtight sheet (not shown) is installed below the insulation layer 31, etc., to prevent moisture from moving between the inside and outside of the room through the roof 3.

Furthermore, the building 1 includes pillars 40, insulation material 41, gypsum boards 43, exterior wall panels 46, base material 47, waterproof sheet 48 (waterproof member), insulation material 49, insulation material 50, base boards 51 (Figure 3), base wood 52, cross bars 53, furring strips 54 (support material), base furring strips 55, water drains 56, water drains 57, and waterproof material 58.

The pillars 40 form part of the upper wall portion 4. The pillars 40 are arranged to extend in the vertical direction. Although not shown in Figures 2 and 3, multiple pillars 40 are arranged at intervals in the left-right direction (the direction perpendicular to the paper surface of Figure 2).

The insulating material 41 is placed in the space between multiple columns 40 adjacent in the left-right direction. The insulating material 41 may be a soft insulating material or a hard insulating material, or both hard and soft insulating materials may be used. The insulating material 41 may also be a foam insulating material or a fiber-based insulating material. The same applies to the insulating materials described below.

In addition, an airtight sheet (not shown) is arranged on the inner surface of the pillar 40 so as to extend in the vertical direction.

The gypsum board 43 (Figure 2) is placed inside the column 40. The gypsum board 43 defines the interior space inside the upper wall portion 4.

The exterior wall panel 46 constitutes the outer surface of the upper wall portion 4. As an example, the exterior wall panel 46 is a ceramic siding. The exterior wall panel 46 has a panel lower end portion 46S that corresponds to the lower end portion of the exterior wall panel 46 (Figure 3).

The base material 47 is made of wood and is placed on the inside of the exterior wall panel 46. The base material 47 is a member for supporting the exterior wall panel 46, and the thickness of the base material 47 forms a space for the upper wall air passage 4A.

The waterproof sheet 48 is arranged on the inside of the exterior wall panel 46, extending vertically on the outer surface of the

insulation materials

49, 50. The waterproof sheet 48 restricts and prevents water from entering the inside of the upper wall portion 4, particularly the

insulation materials

49, 50 and the base board 51. The

insulation materials

49, 50 are arranged on the inside of the exterior wall panel 46, and function as so-called external insulation. The insulation material 50 extends along the base board 51 to the upper end of the upper wall portion 4.

The base plate 51 (Fig. 3) is arranged to extend vertically along the outer surface of the column 40 and the outer surface of the cross beam 53. The base plate 51 functions as a base for the

insulation materials

49, 50.

The base boards 52 (support materials) are arranged continuously in the left-right direction. The base boards 52 have the function of supporting the exterior wall panels 46 via the base materials 47.

The horizontal beams 53 are disposed between adjacent columns 40 in the left-right direction and extend along the left-right direction. The horizontal beams 53 function to support the above-mentioned base boards 51 and base wood 52.

The furring strips 54 are positioned so as to extend vertically below the base board 52. The furring strips 54 are fixed to the pillars 40 with nails (not shown) and support the base furring strips 55.

The base furring strips 55 (Fig. 3) are positioned below the exterior wall panel 46. Although not shown in Figs. 2 and 3, the base furring strips 55 are fixed to the furring strips 54 by nails (not shown). The base furring strips 55 function to support the

flashings

56, 57.

The water cutter 56 prevents water from entering the roof 3 and the upper wall 4 through the upper surface of the uppermost tile 32 among the tiles 32. The upper end of the water cutter 56 is connected to the lower end of the waterproof sheet 48, and the two form a waterproof line. This waterproof line includes the water cutter 57 and the roofing 33 (Figures 2 and 3). The structure of the water cutter 56 will be described in detail later. The water cutter 57 is arranged inside the water cutter 56 and prevents water from entering the roof 3 and the upper wall 4 through the upper surface of the uppermost tile 32. A watertight material 58 is fixed to the tip of the water cutter 57, and the watertight material 58 is arranged so as to be in close contact with the upper surface of the tile 32. The

water cutters

56, 57 are fixed to the base furring strip 55 by screws or fixing means not shown, as shown in Figure 3.

In this embodiment, the upper wall ventilation passage 4A is provided along the exterior wall panel 46 toward the upper end of the exterior wall panel 46 between the exterior wall panel 46 and the waterproof sheet 48. The above-mentioned

heat insulating materials

49, 50, base board 51 and furring strips 54 constitute the exterior wall base G in this embodiment. The above-mentioned exterior wall panel 46 is arranged at intervals on the outside of this exterior wall base G. Furthermore, the roofing 33, base furring strips 55, and water drains 56, 57 function as a restricting portion R. The restricting portion R is provided so as to connect the upper surface of the sheathing board 30 to the waterproof sheet 48, and restricts the intrusion of water into the upper surface of the sheathing board 30 and the exterior wall base G. Also, as shown in FIG. 3, the panel lower end 46S of the exterior wall panel 46 is arranged at an interval above the water drain 56, and forms an air intake P communicating with the upper wall ventilation passage 4A between the water drain 56 and the water drain 56. In this configuration, a connection passage Q is formed inside the restricting portion R, connecting the roof ventilation passage 3A and the upper wall ventilation passage 4A.

The connecting passage Q has a main passage Q1 and a sub-passage Q2 (Figure 3). The main passage Q1 has a lower end that communicates with the roof ventilation passage 3A and extends vertically inside the restricting portion R. Meanwhile, the sub-passage Q2 communicates the main passage Q1 with the upper wall ventilation passage 4A in the front-rear direction (inside-outside direction) above the panel lower end 46S of the exterior wall panel 46.

FIG. 4A is a horizontal cross-sectional view of the vicinity of the connecting passage Q of the building 1 according to this embodiment, FIG. 4B is a front view of the same, and FIG. 4C is a side cross-sectional view of the same. In this embodiment, the main passage Q1 of the connecting passage Q is formed by the insulation material 49, the base board 52, and the furring strips 54. Specifically, as described above, the furring strips 54 are arranged at intervals in the left-right direction. Note that insulation material 54X is arranged between adjacent furring strips 54. Each furring strip 54 extending in the vertical direction has a ventilation slit 54H (support material groove) formed in it so as to face the restricting portion R (FIG. 3). The ventilation slit 54H is a groove formed in the furring strip 54 so as to extend in the vertical direction, as shown in FIG. 4A.

Similarly, a base wood slit 52H (support material groove) is formed in the base wood 52 that is placed above the furring strip 54. The base wood slit 52H is a groove formed in the base wood 52 that extends in the vertical direction, as shown in Figures 4B and 4C. Furthermore, an insulation material slit 49H (insulation material groove) is formed in the insulation material 49 that is placed above the base wood 52. The insulation material slit 49H is a groove formed in the insulation material 49 that extends in the vertical direction, as shown in Figures 4B and 4C.

The lower end of the ventilation slit 54H is connected to the roof ventilation passage 3A. The upper end of the ventilation slit 54H is connected to the lower end of the base wood slit 52H. The upper end of the base wood slit 52H is connected to the lower end of the insulation material slit 49H.

5A is a front view of the drain 56 (covering member) of the building according to this embodiment, and FIG. 5B is a side view of the same. The drain 56 is arranged so as to cover the exterior wall base G inside the exterior wall panel 46. The drain 56 is formed by bending a plate-shaped metal member, and has a first vertical portion 56A (vertical portion), a first inclined portion 56B (inclined portion), a second inclined portion 56C (inclined portion), and a second vertical portion 56D. The first vertical portion 56A constitutes the upper part of the drain 56. The first vertical portion 56A has a plurality of ventilation slits 56H (through holes) formed at intervals in the left-right direction. Each ventilation slit 56H extends in the vertical direction in the shape of an elongated hole. Note that the ventilation slit 56H is not limited to an elongated hole shape, and may be another shape such as a cross shape. The first inclined portion 56B is arranged so as to extend downward from the lower end of the first vertical portion 56A toward the outside. The second inclined portion 56C is connected to the lower end of the first inclined portion 56B via a slight step, and is arranged to extend downward toward the outside, similar to the first inclined portion 56B. The second vertical portion 56D extends downward from the lower end of the second inclined portion 56C. When the gutter 56 is supported by the base furring strip 55, the first vertical portion 56A is arranged opposite the upper part of the insulation material 49 and the base wood 52. Meanwhile, the lower part of the crosspiece 53 and the furring strip 54 are arranged opposite the roofing splice board 33S described above. As a result, the insulation material slit 49H, base wood slit 52H, and ventilation slit 54H described above are blocked from the outside, forming an air passage.

The drain 56 further has a first upper folded portion 561 (protruding portion), a second upper folded portion 562 (protruding portion), and a lower folded portion 563. The first upper folded portion 561 protrudes downward from the upper portion of the plurality of ventilation slits 56H toward the outside. Similarly, the second upper folded portion 562 protrudes downward from the lower portion of the plurality of ventilation slits 56H toward the outside. The first upper folded portion 561 and the second upper folded portion 562 have the function of suppressing the intrusion of water into the plurality of ventilation slits 56H. The lower folded portion 563 protrudes inward from the lower end of the second vertical portion 56D. The protruding direction of each folded portion may be limited to the embodiment shown in FIG. 5.

When the first vertical portion 56A of the drain 56 is positioned so as to extend vertically along the outer surfaces of the insulation 49 and insulation 50 inside the exterior wall panel 46, the ventilation slit 56H formed in the first vertical portion 56A is positioned opposite the insulation slit 49H in FIG. 4B. As a result, the ventilation slit 56H forms a sub-passage Q2, connecting the main passage Q1 and the upper wall ventilation passage 4A in the inward and outward directions. Meanwhile, the first inclined portion 56B of the drain 56 forms an intake port P between the panel lower end 46S of the exterior wall panel 46 as shown in FIG. 3. Furthermore, the portion of the drain 56 that extends above the first upper fold 561 receives the waterproof sheet 48.

As described above, in this embodiment, the waterproof sheet 48 and the restricting portion R can maintain high waterproof performance around the connection portion 5 from the roof 3 to the upper wall portion 4, and the air in the roof air passage 3A can be made to flow into the upper wall air passage 4A through the connecting passage Q. This allows the air in the roof 3 and the upper floor to be exhausted to the outdoors through the same ventilation passage, and prevents condensation from forming in the roof air passage 3A and the upper wall air passage 4A. At this time, outside air flows into the upper wall air passage 4A from the intake port P between the panel lower end portion 46S of the exterior wall panel 46 and the restricting portion R, so that the rising air current can quickly guide the air flowing in from the roof air passage 3A and the air flowing in from the inside of the exterior wall base G upward. Furthermore, even in winter, when humid air flows from the roof air passage 3A through the connecting passage Q into the upper wall air passage 4A, the relative humidity can be reduced by the outside air taken in from the intake port P, so condensation caused by the moisture of the air flowing in from the roof air passage 3A and the moisture of the air flowing in from the inside of the upper wall 4 can be reliably prevented from occurring around the upper wall air passage 4A.

In addition, in this embodiment, the connecting passage Q has a main passage Q1 and a sub-passage Q2, so that the air flowing in from the roof ventilation passage 3A can be guided to a position above the lower end portion 46S of the panel by the main passage Q1, and then the air can be directed into the upper wall ventilation passage 4A by the sub-passage Q2.

Furthermore, in this embodiment, the main passage Q1 includes an insulation slit 49H formed in the insulation 49 along the vertical direction so as to face the restricting portion R. With this configuration, the insulation slit 49H formed in the insulation 49 can be used to guide the air flowing in from the roof ventilation passage 3A upward.

The main passage Q1 also includes base board slits 52H and ventilation slits 54H formed in the base board 52 and furring strips 54 along the vertical direction so as to face the restricting portion R. With this configuration, the slits formed in the base board 52 and furring strips 54 can be used to guide the air flowing in from the roof ventilation passage 3A upward.

Furthermore, in this embodiment, the ventilation slits 56H formed in the drain 56 can be used to allow air in the main passage Q1 to flow inward and outward into the upper wall ventilation passage 4A.

In particular, because the drain 56 has a first vertical section 56A and a first inclined section 56B, it can provide waterproofing to the exterior wall base G, allow air to flow from the main passage Q1 into the upper wall air passage 4A, and take in outside air into the upper wall air passage 4A.

In addition, in this embodiment, the drip edge 56 has a first upper fold portion 561 and a second upper fold portion 562, so even if water infiltrates around the drip edge 56 from the exterior wall panel 46 side, the water can be prevented from infiltrating into the ventilation slit 56H. Note that the drip edge 56 may have either the first upper fold portion 561 or the second upper fold portion 562.

　The above describes the building 1 according to one embodiment of the present invention, but the present invention is not limited to this, and for example, the following modified embodiments can be adopted.

(1) Figure 6A is a horizontal cross-sectional view of the area around the connecting passage of a building according to a first modified embodiment of the present invention, Figure 6B is a front view of the same, and Figure 6C is a side cross-sectional view of the same. In the above embodiment, as shown in Figure 4, the slits are formed in the furring strips 54, the base board 52, and the insulation material 49 from below, but the present invention is not limited to this. As shown in Figure 6, a main passage Q1 may be formed between adjacent furring strips 54 in the left-right direction. In this case, a ventilation slit 54H is formed in the insulation material 54X, which in turn communicates with the base board slit 52H and the insulation material slit 49H, as in the embodiment described above. Even in this case, the air flowing in from the roof ventilation passage 3A can be guided upward.

(2) Figure 7 is a cross-sectional view of the upper end portion of the roof of a building according to a second modified embodiment of the present invention. In the previous embodiment, the building 1 has been described as having a so-called external insulation structure, but the building 1 may not have this structure. In Figure 7, a plywood board 73 is arranged on the outer surface of the insulation material 41 similar to that of Figure 3. A waterproof sheet 48 is arranged on the outer surface of the plywood board 73. The main passage Q1 of the connection passage Q is formed by the cross beam 53, as well as the ventilation spacer 71 and the ventilation spacer 72 provided on the outer surface side of the insulation material 41 so as to sandwich the cross beam 53 from above and below. The cross beam 53 has a ventilation slit 53H (not shown) formed in the vertical direction. On the other hand, the ventilation spacer 71 and the ventilation spacer 72 are made of an elastic member having a cell structure that allows air to pass through. In this modified embodiment, the ventilation slit 56H of the drain 56 is arranged so as to face the ventilation spacer 71. If the plywood 73 and the ventilation spacer 71 are arranged so that they overlap, a ventilation slit may also be formed in the plywood 73. Even in this configuration, air that flows from the roof ventilation passage 3A into the main passage Q1 of the connection passage Q can flow into the upper wall ventilation passage 4A through the main passage Q1 and the sub-passage Q2.

In addition, the specific embodiments of the present invention described above mainly include inventions having the following configurations. That is, the building according to the first aspect of the present invention comprises a roof having a roof foundation and a roof ventilation passage provided along the roof foundation below the roof foundation, and an exterior wall erected on the end of the roof, the exterior wall having the exterior wall foundation, an exterior wall panel arranged on the outside of the exterior wall foundation, a waterproofing member arranged to extend vertically on the outer surface of the exterior wall foundation and restrict the intrusion of water into the exterior wall foundation, and an exterior wall ventilation passage provided along the exterior wall panel toward the upper end of the exterior wall panel between the exterior wall panel and the waterproofing member, and a restricting portion provided so as to connect the upper surface of the roof foundation to the waterproofing member and restrict the intrusion of water into the upper surface of the roof foundation and the exterior wall foundation, the exterior wall panel is arranged above the restricting portion at a distance, and has a panel lower end forming an air intake port communicating with the exterior wall ventilation passage between the restricting portion and the exterior wall ventilation passage, and a connecting passage is formed inside the restricting portion to connect the roof ventilation passage and the exterior wall ventilation passage.

With this configuration, the waterproofing performance from the roof to the exterior wall can be maintained at a high level by the waterproofing member and the restricting section, and the air in the roof ventilation passage can be made to flow into the exterior wall ventilation passage through the connecting passage. As a result, the air from the roof and the upper floor can be discharged to the outdoors through the same ventilation passage, and the occurrence of condensation in the roof ventilation passage and the exterior wall ventilation passage can be suppressed. At this time, since outside air flows into the exterior wall ventilation passage from the intake port between the lower end of the exterior wall panel and the restricting section, the air flowing in from the roof ventilation passage and the air flowing in from the inside of the exterior wall substrate can be quickly guided upward by the rising air current. Furthermore, even if humid air flows into the exterior wall ventilation passage from the roof ventilation passage through the connecting passage in winter, the relative humidity can be reduced by the outside air taken in from the intake port, so that the occurrence of condensation around the exterior wall ventilation passage due to the moisture of the air flowing in from the roof ventilation passage and the moisture of the air flowing in from the inside of the exterior wall can be stably suppressed.

In a building according to a second aspect of the present invention, in the building according to the first aspect described above, it is preferable that the connecting passage has a lower end communicating with the roof ventilation passage, a main passage extending in the vertical direction inside the restricting portion, and a sub-passage communicating inwardly and outwardly between the main passage and the exterior wall ventilation passage above the lower end of the panel.

With this configuration, the air flowing in from the roof ventilation passage can be guided by the main passage to a position above the lower end of the panel, and then the air can be directed into the exterior wall ventilation passage by the sub-passage.

The building according to the third aspect of the present invention is the building according to the second aspect described above, wherein the exterior wall base has a heat insulating material arranged inside the restricting portion, and the main passage preferably includes a heat insulating material groove portion formed in the heat insulating material along the vertical direction so as to face the restricting portion.

With this configuration, the insulation grooves formed in the insulation can be used to guide the air flowing in from the roof ventilation passage upward.

The building according to the fourth aspect of the present invention is the building according to the second or third aspect above, in which the exterior wall base has a support material that supports the exterior wall panel, and the main passage preferably includes a support material groove portion formed in the support material along the vertical direction so as to face the restricting portion.

With this configuration, the support groove formed in the support can be used to guide the air flowing in from the roof ventilation passage upward.

The building according to the fifth aspect of the present invention is a building according to any one of the second to fourth aspects above, in which the regulating portion has a covering member arranged so as to cover the exterior wall base inside the exterior wall panel, and the sub-passage is preferably formed by a through hole formed so as to penetrate the covering member in an inward and outward direction.

With this configuration, the through holes formed in the covering member can be used to allow air in the main passage to flow into the outer wall ventilation passage.

The building according to the sixth aspect of the present invention is the building according to the fifth aspect described above, in which the covering member is arranged so as to extend vertically inside the exterior wall panel along the outer surface of the exterior wall base, and has a vertical section in which the through hole is formed, and an inclined section which is arranged so as to extend downward from the lower end of the vertical section toward the outside, and which forms the intake between the lower end of the panel and the vertical section.

With this configuration, the covering member can provide waterproofing to the exterior wall base, allow air to flow from the main passage into the exterior wall ventilation passage, and take in outside air into the exterior wall ventilation passage.

The seventh aspect of the present invention relates to a building according to the sixth aspect described above, and it is preferable that the covering member further has a protrusion that protrudes outward from at least one of the upper and lower parts of the through hole so as to prevent water from entering the through hole.

With this configuration, even if water infiltrates from the exterior wall panel into the area around the covering member, the water can be prevented from entering the through hole.

The present invention makes it possible to prevent condensation from occurring in ventilation passages and their surroundings in buildings with eaves structures while maintaining waterproofing performance around the joints between the eaves and exterior walls.

Claims

A roof having a roof substrate and a roof ventilation passage provided below and along the roof substrate;
an exterior wall erected on an end of the roof, the exterior wall having an exterior wall base, an exterior wall panel arranged on the outside of the exterior wall base, a waterproofing member arranged to extend in the vertical direction on the outer surface of the exterior wall base and to restrict the intrusion of water into the exterior wall base, and an exterior wall ventilation passage provided along the exterior wall panel toward the upper end of the exterior wall panel between the exterior wall panel and the waterproofing member;
a restricting portion provided so as to connect the upper surface of the roof foundation to the waterproofing member and restricting the intrusion of water into the upper surface of the roof foundation and the exterior wall foundation;
The exterior wall panel is disposed above the restricting portion at a distance, and has a panel lower end portion that forms an air intake port communicating with the exterior wall ventilation passage between the restricting portion and the panel lower end portion,
A connecting passage that connects the roof ventilation passage and the exterior wall ventilation passage is formed inside the regulating portion.
The building according to claim 1,
The connecting passage is
A main passage having a lower end communicating with the roof ventilation passage and extending in a vertical direction inside the restricting portion;
a sub-passage communicating the main passage and the exterior wall ventilation passage in an inward/outward direction above a lower end of the panel;
A building having:
The building according to claim 2,
The exterior wall base has a heat insulating material disposed inside the restricting portion,
The main passage of the building includes an insulation groove portion formed in the insulation material along the vertical direction so as to face the regulating portion.
The building according to claim 2 or 3,
The exterior wall base has a support material that supports the exterior wall panel,
The main passage of the building includes a support groove portion formed in the support material along the vertical direction so as to face the regulating portion.
A building according to any one of claims 2 to 4,
The restricting portion has a covering member arranged to cover the exterior wall base on the inside of the exterior wall panel,
A building, wherein the sub-passage is formed by a through hole formed so as to penetrate the covering member in an inward and outward direction.
The building according to claim 5,
The covering member is
A vertical portion is disposed inside the exterior wall panel so as to extend in the vertical direction along the outer surface of the exterior wall base, and the through hole is formed in the vertical portion;
an inclined portion that is disposed so as to extend downward from a lower end of the vertical portion toward an outside and forms the intake port between the vertical portion and the lower end of the panel;
A building having:
The building according to claim 6,
The covering member further has a protrusion that protrudes outward from at least one of the upper and lower parts of the through hole so as to prevent water from entering the through hole, the building.