JP7747087B2 - Airtight structure of buildings - Google Patents

Description

The present invention relates to an airtight structure installed in a building having a lower floor, an upper floor installed above the lower floor, and a roof extending outward from the beams between the lower and upper floors.

A residential building described in Patent Document 1 is a known example of such a building. This residential building comprises a girth between the first and second floors, a wall above the girth, and a balcony extending outward from the girth.

The wall has a panel frame attached to the top surface of the girder, a surface material for the exterior wall panel, and insulation attached to the inside of the surface material.

The balcony has a cantilever beam extending outward from the girder, a lightweight concrete slab installed on the cantilever beam, and a floor surface installed on the lightweight concrete slab.

The residential building also has a waterproof sheet that extends from the balcony floor along the exterior wall panels.

The wall insulation is intended to provide insulation between the interior and exterior of the second floor, located inside the wall.

Japanese Patent Application Laid-Open No. 2003-253833

In the above-mentioned residential building, if there is a room on the first floor below the balcony, insulation material is installed on the balcony to provide thermal insulation between the first floor room and the outside (the space above the balcony).

In this case, an airtight layer must be installed on the wall and balcony to prevent condensation inside the insulation in the wall and on the balcony. Specifically, an airtight layer must be installed on the interior side of the wall's surface that holds the facing material of the exterior wall panel (the outer surface of the panel frame), and on the balcony's surface that holds the lightweight concrete slab (the top surface of the cantilever beam).

However, Patent Document 1 does not mention providing an airtight layer on the walls and balconies.

The object of the present invention is to provide an airtight structure for a building that can effectively prevent condensation from occurring in components, including insulation, installed on the exterior walls of the upper floors supported by beams and on the roofs of the lower floors that extend from the beams to the outside.

In order to solve the above problem, the first invention is an airtight structure for a building having a lower floor and an upper floor located above the lower floor, comprising an exterior wall of the upper floor, beams supporting the exterior wall, and a roof extending outward from the beams to cover the room on the lower floor from above, the exterior wall comprising an exterior wall surface material, a wall retaining member that holds the exterior wall surface material and is erected on the beam, wall insulation material located inside the exterior wall surface material, and a wall airtight member that covers the room on the upper floor from the outside at a position inside the outer surface of the wall retaining member. The roof comprises a roof surface material, roof retention members that hold the roof surface material and extend outward from the beams, roof insulation provided below the roof surface material, and roof airtight members that cover the rooms on the lower floor from above at a position below the roof surface material, and the wall airtight members and the roof airtight members are connected to each other through the area on the side of the wall retention members where the beams are located and the area on the side of the roof retention members where the beams are located, thereby providing an airtight structure for a building.

According to the first invention, since the exterior walls and roof are provided with insulation and airtight members, respectively, it is possible to suppress condensation on components containing insulation. Specifically, if an airtight member is provided on the indoor side of the insulation, it is possible to prevent humid indoor air from entering the insulation in winter, thereby suppressing condensation caused by cold outdoor air on components containing insulation provided on the outdoor side of the airtight member. On the other hand, if an airtight member is provided on the outdoor side of the insulation, it is possible to prevent humid outdoor air from entering the insulation in summer, thereby suppressing condensation caused by cold indoor air on components containing insulation provided on the indoor side of the airtight member.

Furthermore, the wall airtight member and the roof airtight member are connected to each other through the area of the wall retaining member on the side where the beam is located, and the area of the roof retaining member on the side where the beam is located. This makes it possible to continuously suppress condensation in the components containing the above-mentioned insulation from the exterior wall to the roof.

Therefore, according to the first invention, it is possible to effectively prevent condensation from occurring in components including insulation installed on the exterior walls of the upper floor supported by beams and on the roof of the lower floor extending from the beams to the outside.

In the first invention, the exterior wall preferably has a second wall retaining member that holds the exterior wall surface material and is erected on the beam at a position away from the wall retaining member in the longitudinal direction of the beam, and the wall airtight member and the roof airtight member are connected to each other through the space between the wall retaining member and the second wall retaining member (second invention).

One possible configuration for connecting the wall airtight member and the roof airtight member to each other through the area on the side of the wall retaining member where the beam is located and the area on the side of the roof retaining member where the beam is located is to connect them through the area on the interior side of the beam. However, in this case, because multiple components are connected to the beam, the wall airtight member and the roof airtight member must be positioned to avoid interference with these components, making the configuration for connecting the two airtight members complex.

In contrast, according to the second invention, the wall airtight member and roof airtight member can be connected to each other by utilizing the space above the beam, i.e., the space between the wall retaining member and the second wall retaining member, thereby simplifying the structure for connecting the two airtight members.

In the second invention, the airtight structure of the building further includes a flooring material for the upper floor placed on the upper surface of the beam between the wall retaining member and the second wall retaining member, with the roof-side area of the upper surface of the beam closest to the roof open, and an intermediate airtight member that has a shape extending from the roof-side area via the end surface of the flooring material to the upper surface of the flooring material and is arranged along the roof-side area and the end surface and upper surface of the flooring material, and it is preferable that the wall airtight member and the roof airtight member are connected to each other via the intermediate airtight member (third invention).

One possible configuration for connecting the two airtight members is to use sheet-like airtight members, which are relatively easily deformable, as the two airtight members and use these to connect the wall retaining member and the second wall retaining member. However, in this case, due to the degree of freedom in deformation of the airtight members, it is difficult to position the two airtight members along the top surfaces of the beams and floor material. If the airtight members are positioned away from the beams or floor material, they may be damaged by the influence of the surrounding structure of the beams and floor material, resulting in a decrease in airtightness.

In contrast, in the third invention, the two airtight members are connected to each other via an intermediate airtight member that has a pre-defined shape that extends from the roof side area, via the edge face of the flooring material, to the top surface of the flooring material, thereby reducing the influence of the surrounding structure of the beams and flooring material. This allows airtight performance to be maintained.

In the third invention, it is preferable that the airtight structure of the building further includes a roof-side clamping member that clamps the overlapping portions of the roof airtight member and the intermediate airtight member between the roof-side region of the beam, and that the roof surface material is placed on the roof-side clamping member (fourth invention).

According to the fourth invention, the overlapping portion of the roof airtight member and the intermediate airtight member are clamped between the beam and the roof-side clamping member, thereby maintaining a stable connection between the two airtight members. Furthermore, because the roof-side clamping member, which contributes to stabilizing the connection between the two airtight members as described above, also serves as a member supporting the roof surface material, it is possible to achieve both a stable connection and a reduced number of parts.

In the third or fourth invention, the airtight structure of the building preferably further includes a floor-side clamping member having a clamping surface that clamps the overlapping portions of the wall airtight member and the intermediate airtight member between the floor surface material and the floor, and a rising surface that rises from the clamping surface and faces away from the exterior wall surface material, and the wall airtight member is preferably clamped between the floor-side clamping member and the floor surface material while being arranged along the clamping surface and the rising surface (fifth invention).

According to the fifth invention, the overlapping portion of the wall airtight member and the intermediate airtight member are clamped between the floor surface material and the floor-side clamping member, thereby maintaining a stable connection between the two airtight members. Furthermore, the floor-side clamping member, which contributes to stabilizing the connection between the two airtight members as described above, also serves as a member for positioning the wall airtight member in the correct position and redirecting it toward the intermediate airtight member, thereby achieving both a stable connection and a reduced number of parts.

In any one of the third to fifth inventions, the airtight structure of the building further comprises a connecting airtight member having a beam-side portion that has a shape extending from the roof-side area via the edge of the flooring material to the upper surface of the flooring material, and a retaining-side portion that rises from an edge of the beam-side portion close to the wall retaining member along the side of the wall retaining member, and it is preferable that the connecting airtight member is connected to the intermediate airtight member with a portion of the intermediate airtight member overlapping the beam-side portion (sixth invention).

According to the sixth aspect of the invention, the beam-side portion and the retaining-side portion can form a continuous airtight line from the top surface of the beam and floor material to the side surface of the wall retaining member. Furthermore, by overlapping a portion of the intermediate airtight member with the beam-side portion, an airtight line can be formed along the complex surface shape formed by the beam, floor material, and wall retaining member.

In addition, the beam-side portion is pre-shaped to extend from the roof-side area through the edge of the flooring material to the top surface of the flooring material. This allows the connecting airtight member to be positioned along the beam and flooring material, preventing damage to the airtight member due to influence from surrounding members, as would occur when using sheet-shaped airtight members.

In the first invention, it is preferable that the wall airtight member and the roof airtight member are connected to each other through the interior-side region of the beam (seventh invention).

In the seventh invention, the wall airtight member and the roof airtight member are connected to each other through the area on the interior side of the beam, i.e., the area on the opposite side of the beam from the wall retaining member, and the area on the opposite side of the beam from the roof retaining member. Therefore, even if the wall retaining member is erected on the beam, the wall airtight member and the roof airtight member can be connected while avoiding the wall retaining member.

This invention effectively prevents condensation from occurring in components, including insulation, installed on the exterior walls of the upper floor supported by beams and on the roof of the lower floor extending from the beams to the outside.

1 is a side cross-sectional view of an airtight structure for a building according to a first embodiment of the present invention. FIG. 2 is an enlarged side cross-sectional view showing a connection portion between a beam, a roof, and an exterior wall in FIG. 1 . FIG. 3 is an exploded perspective view of a part of the configuration shown in FIG. 2 . FIG. 6 is a side cross-sectional view of an airtight structure for a building according to a second embodiment of the present invention. FIG. 10 is a side cross-sectional view of an airtight structure for a building according to a third embodiment of the present invention. FIG. 10 is a side cross-sectional view of an airtight structure for a building according to a fourth embodiment of the present invention. FIG. 7 is an exploded perspective view of a portion of the configuration shown in FIG. 6. FIG. 8 is an enlarged perspective view of a first airtight connection member shown in FIG. 7 .

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that the following embodiments are examples of specific embodiments of the present invention and are not intended to limit the technical scope of the present invention.

Figure 1 is a side cross-sectional view of an airtight structure 1 for a building according to a first embodiment of the present invention.

Referring to Figure 1, the airtight structure 1 comprises a lower floor DF having a lower room DR, and an upper floor UF located above the lower floor DF and having an upper room UR. Specifically, the airtight structure 1 comprises an exterior wall 2 of the upper floor UF, beams 3 supporting the exterior wall 2, a roof 4 extending outward from the beams 3 to cover the lower room DR from above, a floor surface material 5 and an interior wall surface material 6 supported by the beams 3, and a ceiling surface material 7 suspended by the beams 3.

The floor material 5 and the interior wall material 6 are used to partition the upper room UR. Specifically, the floor material 5 is placed on the beams 3 and fixed to them so that it faces the upper room UR. The interior wall material 6 is erected on the floor material 5 so that it faces the upper room UR.

The ceiling surface material 7 forms the ceiling of the lower room DR. Specifically, the ceiling surface material 7 is suspended from the beams 3 via a suspension member (not shown) while facing the lower room DR.

The exterior wall 2 comprises an exterior wall surface material 2a, multiple wall retaining members 2b (see Figure 3) that hold the exterior wall surface material 2a and are erected on the beams 3, multiple wall insulation materials 2c provided on the inside of the exterior wall surface material 2a, and wall airtight members 2d that cover the upper room UR from the outside at positions inside the outer surfaces 2b1 of the wall retaining members 2b.

The exterior wall surface material 2a is attached to the multiple wall retaining members 2b so that a space for accommodating a portion of the wall insulation material 2c is formed between the multiple wall retaining members 2b. Specifically, the exterior wall surface material 2a is attached to the multiple wall retaining members 2b via a base material (not shown) that is fixed to the outer surfaces 2b1 of the multiple wall retaining members 2b.

The multiple wall retaining members 2b are erected on the beam 3 at positions spaced apart in the longitudinal direction of the beam 3 (a direction perpendicular to the plane of the paper in FIG. 1) (see FIG. 3). Specifically, the multiple wall retaining members 2b include a column 2bA, a half column 2bB, and a stud 2bC. The column 2bA is connected to the beam 3 in a so-called column-first state, while the half column 2bB and the stud 2bC are connected to the beam 3 in a so-called beam-first state. In other words, the two beams 3 extend horizontally from both sides of the beam 3, and the half column 2bB and the stud 2bC are erected on the beam 3. Note that one of the multiple wall retaining members 2b is an example of a wall retaining member, and the other is an example of a second wall retaining member.

The multiple wall insulation materials 2c include multiple external insulation materials 2c1 provided on the outside of the wall retaining members 2b and multiple internal insulation materials 2c2 provided inside the external insulation materials 2c1. The multiple external insulation materials 2c1 include those provided on top of the above-mentioned base material (not shown) and those provided below. The multiple external insulation materials 2c1 are rigid insulation materials made of, for example, urethane foam. The multiple internal insulation materials 2c2 are provided between two adjacent wall retaining members 2b (see Figure 3) in the longitudinal direction of the beam 3. The multiple internal insulation materials 2c2 are flexible insulation materials made of, for example, glass wool.

The wall airtight member 2d is provided inside the multiple wall insulation materials 2c. Specifically, as shown in FIG. 2, the wall airtight member 2d has a portion arranged along the inner surface 2b2 of the wall retaining member 2b, and a portion arranged along the rising surface 2j2 and clamping surface 2j1 of the floor-side clamping member 2j (described below). The wall airtight member 2d is an airtight sheet (for example, a sheet made of polyethylene, polypropylene, polyethylene terephthalate, etc.).

The roof 4 comprises a roof surface material 4a, multiple roof support members 4b that support the roof surface material 4a and extend outward from the beams 3, multiple intervening members (purlins) 4c that are interposed between the roof surface material 4a and the multiple roof support members 4b or the beams 3, multiple roof insulation members 4d that are provided below the roof surface material 4a, and a roof airtight member 4e that covers the lower room DR from above at a position below the roof surface material 4a. The roof 4 further comprises a roof finishing material 4f laid on the roof surface material 4a, a cover 4g that is provided from the end of the roof finishing material 4f closest to the exterior wall 2 to the outer surface of the exterior wall 2, and a water-repellent member 4h that covers the upper end of the cover 4g from above and from the outside. The cover 4g prevents rainwater and other contaminants from infiltrating the boundary between the roof finishing material 4f and the exterior wall 2. The water-repellent member 4h also prevents rainwater and other contaminants from infiltrating between the cover 4g and the exterior wall 2.

Multiple roof retention members 4b (only one is shown in the figure) are spaced apart along the length of the beam 3 and extend horizontally outward from the exterior wall 2. Specifically, the inner end of each roof retention member 4b is fixed to the beam 3, while the outer end of each roof retention member 4b is supported by a pillar (not shown). The height of each roof retention member 4b is set equal to the height of the beam 3, and the upper and lower surfaces of each roof retention member 4b are positioned on the same plane as the upper and lower surfaces of the beam 3.

The multiple intervening members 4c (only one is shown in the figure) are used to form a space between the roof surface material 4a and the roof holding member 4b for placing a portion of the roof insulation material 4d. Specifically, the multiple intervening members 4c extend perpendicular to the roof holding member 4b and are placed on the roof holding member 4b, with the roof surface material 4a being placed on the multiple intervening members 4c. To support the end of the roof surface material 4a, which is located above and spaced apart from the roof holding member 4b and is closer to the exterior wall 2, the airtight structure 1 further includes a roof-side clamping member 4i interposed between the roof surface material 4a and the beam 3. The roof-side clamping member 4i extends parallel to the multiple intervening members 4c below the end of the roof holding member 4b closest to the exterior wall 2. Furthermore, as described above, because the top surfaces of the roof holding member 4b and the beam 3 are flush with each other, the height of the roof-side clamping member 4i is equal to the height of the multiple intervening members 4c.

The multiple roof insulation materials 4d include multiple upper insulation materials 4d1 arranged between two adjacent intervening members 4c and between adjacent intervening members 4c and the roof-side clamping member 4i, and multiple lower insulation materials 4d2 (only one is shown in the figure) arranged between two adjacent roof support members 4b below the multiple upper insulation materials 4d1. The upper insulation material 4d1 is arranged below the upper surface of the roof support member 4b so that a ventilation passage is formed between the upper insulation material 4d1 and the roof surface material 4a. The lower surface of the upper insulation material 4d1 is arranged flush with the lower surfaces of the intervening member 4c and the roof-side clamping member 4i. The lower insulation material 4d2 is attached to the roof support member 4b with its upper surface arranged flush with the upper surface of the roof support member 4b. The upper insulation materials 4d1 and 4d2 are made of rigid insulation materials such as urethane foam.

The roof airtight member 4e is arranged along the upper surface of the roof retaining member 4b and the upper surface of the beam 3. Specifically, as shown in Figures 1 and 2, the roof airtight member 4e has a portion sandwiched between the roof retaining member 4b and the interposition member 4c, a portion sandwiched between the roof retaining member 4b and the upper insulation 4d1, a portion sandwiched between the lower insulation 4d2 and the interposition member 4c, a portion sandwiched between the lower insulation 4d2 and the upper insulation 4d1, and a portion sandwiched between the beam 3 and the roof-side clamping member 4i. The roof airtight member 4e is an airtight sheet (e.g., a sheet made of polyethylene, polypropylene, polyethylene terephthalate, etc.).

The wall airtight member 2d and the roof airtight member 4e are connected to each other through the area of the wall retaining member 2b on the side where the beam 3 is located (the area below the wall retaining member 2b in Figure 1) and the area of the roof retaining member 4b on the side where the beam is located (the area to the right of the roof retaining member 4b in Figure 1). Specifically, the wall airtight member 2d and the roof airtight member 4e are connected to each other through the space between adjacent wall retaining members 2b in the longitudinal direction of the beam 3.

Furthermore, whether the wall retaining member 2b is made of wood or metal, the wall retaining member 2b can be treated as an airtight member. Therefore, the wall airtight member 2d and roof airtight member 4e must be connected to the wall retaining member 2b.

The above-described connection between the wall airtight member 2d, roof airtight member 4e, and wall retaining member 2b can also be achieved by expanding at least one of the wall airtight member 2d and roof airtight member 4e and using the wall airtight member 2d and roof airtight member 4e. However, in the first embodiment, the above-described connection is achieved via an airtight member other than the wall airtight member 2d and roof airtight member 4e.

Figure 2 is an enlarged side cross-sectional view of the connection between the beam, roof, and exterior wall in Figure 1. Figure 3 is an exploded perspective view of a portion of the structure shown in Figure 2.

Referring to Figures 2 and 3, the airtight structure 1 further includes an intermediate airtight member 8 arranged along the outer and upper surfaces of the beam 3 and the outer end and upper surfaces of the floor material 5, and a plurality of first connecting airtight members 9A-9C (sometimes collectively referred to as first connecting airtight members 9) and a plurality of second connecting airtight members 10A-10C (sometimes collectively referred to as second connecting airtight members 10) arranged across the intermediate airtight member 8 and the wall retaining member 2b. These intermediate airtight members 8, first connecting airtight members 9, and second connecting airtight members 10 are made of an airtight material (e.g., polyethylene, polypropylene, polyethylene terephthalate, etc.).

Before describing the intermediate airtight member 8, the relationship between the floor material 5 and the wall retaining member 2b will be explained. The floor material 5 is placed on the top surface of the beam 3 between two wall retaining members 2b adjacent to each other in the longitudinal direction of the beam 3, with the roof-side region RR on the top surface of the beam 3, which is closest to the roof 4, open. Specifically, the floor material 5 has an opening area corresponding to the cross-sectional shape of the column 2bA and has a groove 5a that opens outward (see Figure 7). Meanwhile, the half column 2bB and the partition stud 2bC have grooves 2bBa and 2bCa that open inward to receive the floor material 5 (see Figure 7). The floor material 5 is placed on the top surface of the beam 3 with the column 2bA inserted into the groove 5a of the floor material 5 and the floor material 5 inserted into the grooves 2bBa and 2bCa.

The intermediate airtight member 8 has a predetermined shape that extends from the outer surface of the wall retaining member 2b through the roof-side region RR and the outer edge surface of the flooring material 5 to the upper surface of the flooring material 5. Specifically, the intermediate airtight member 8 has a first vertical portion 8a extending in the vertical direction, a first horizontal portion 8b extending inward from the upper edge of the first vertical portion 8a, a second vertical portion 8c extending upward from the inner edge of the first horizontal portion 8b, and a second horizontal portion 8d extending inward from the upper edge of the second vertical portion 8c. The vertical dimension of the first vertical portion 8a is set so that the lower end of the first vertical portion 8a is exposed below the lower insulation material 4d2. To improve the airtightness between the intermediate airtight member 8 and the lower insulation material 4d2, an airtight sealant can be filled in the boundary between the exposed portion of the first vertical portion 8a below the lower insulation material 4d2 and the lower insulation material 4d2. Additionally, the length of the second horizontal portion 8d from the second vertical portion 8c is set so that it terminates outside the inner surface 2b2 of the wall retaining member 2b. The lower end of the wall airtight member 2d overlaps the second horizontal portion 8d. To improve the airtightness between the wall airtight member 2d and the floor surface material 5, an airtight sealant can be filled into the boundary between the wall airtight member 2d and the floor surface material 5.

The first airtight connection member 9 includes a first airtight connection member 9A attached to the column 2bA, a first airtight connection member 9B attached to the half column 2bB, and a first airtight connection member 9C attached to the partition 2bC. The only difference between the first airtight connection members 9A to 9C is the longitudinal dimension of the beam 3 at the connecting portion 9b (described below). The remaining configurations are the same, so only the configuration of the first airtight connection member 9C will be described below.

The first connecting airtight member 9C has a pair of side portions 9a provided on both sides of the wall retaining member 2b in the longitudinal direction of the beam 3, and a connecting portion 9b connecting the pair of side portions 9a to each other. Each side portion 9a has a beam-side portion 9a1 that has a predetermined shape extending from the outer surface of the beam 3 via the roof-side region RR and the outer end surface of the flooring material 5 to the upper surface of the flooring material 5, and a retaining-side portion 9a2 that rises from the edge of the beam-side portion 9a1 close to the wall retaining member 2b along the side surface 2b3 of the wall retaining member 2b. The beam-side portion 9a1 has a first vertical portion 9a1a extending in the vertical direction, a first horizontal portion 9a1b extending inward from the upper end of the first vertical portion 9a1a, a second vertical portion 9a1c extending upward from the inner edge of the first horizontal portion 9a1b, and a second horizontal portion 9a1d extending inward from the upper end of the second vertical portion 9a1c. The connecting portion 9b extends in the longitudinal direction of the beam 3 so as to connect the outer edges of the first vertical portion 9a1a and the holding side portion 9a2 of the pair of side portions 9a.

The second airtight connection member 10 includes a second airtight connection member 10A attached to the column 2bA, a second airtight connection member 10B attached to the half column 2bB, and a second airtight connection member 10C attached to the stud 2bC. The only difference between the second airtight connection members 10A to 10C is the dimensions of the base 10a and inner surface 10b2 (described below) in the longitudinal direction of the beam 3. The rest of the configuration is the same, so only the configuration of the second airtight connection member 10C will be described below.

The second connecting airtight member 10C is pre-shaped to extend from the upper surface of the floor material 5 to both side surfaces 2b3 and the inner surface 2b2 of the wall retaining member 2b. Specifically, the second connecting airtight member 10C has a base 10a that is placed on the floor material 5 and has a groove 10a1 that opens outward for inserting the wall retaining member 2b, and an upright portion 10b that stands on the edge of the groove 10a1 in the base 10a. The upright portion 10b has a pair of side surfaces 10b1 that face each other in the longitudinal direction of the beam 3, and an inner surface 10b2 that extends in the longitudinal direction of the beam 3 to connect the inner edges of the pair of side surfaces 10b1. When the first and second airtight connection members 9 and 10 are attached to the wall retaining member 2b, the base 10a and the pair of side portions 10b1 are sized to overlap the second horizontal portion 9a1d and retaining side portion 9a2 of the first airtight connection member 9.

The intermediate airtight member 8, first connecting airtight member 9, and second connecting airtight member 10 are assembled to the beam 3, wall retaining member 2b, and floor material 5 as follows:

First, the first connecting airtight member 9 is attached to the beam 3 and wall retaining member 2b from the outside and connected to the beam 3 and wall retaining member 2b with airtight tape or the like. In addition, in the area where the planned installation position of the first connecting airtight member 9 overlaps with the installation position of the roof retaining member 4b, a portion of the first connecting airtight member 9 (the connecting portion 9b or a portion of the first horizontal portion 9a1b) is removed to avoid the roof retaining member 4b. Next, the intermediate airtight member 8 is attached to the beam 3 from above so as to overlap the side portion 9a of the first connecting airtight member 9, and connected to the beam 3 and first connecting airtight member 9 with airtight tape or the like. The second connecting airtight member 10 is attached to the wall retaining member 2b and floor material 5 from the inside so as to overlap the retaining side portion 9a2 of the first connecting airtight member 9 and the second horizontal portion 8d of the intermediate airtight member 8, and is connected to the wall retaining member 2b, floor material 5, intermediate airtight member 8, and first connecting airtight member 9 with airtight tape or the like.

The wall airtight member 2d and roof airtight member 4e are connected to the intermediate airtight member 8, first connecting airtight member 9, and second connecting airtight member 10 assembled as described above.

Specifically, the wall airtight member 2d is positioned along the inner surface 2b2 of the wall retaining member 2b before the interior wall surface material 6 is attached, and is connected to the wall retaining member 2b with airtight tape or the like. Between two adjacent wall retaining members 2b in the longitudinal direction of the beam 3, the lower end of the wall airtight member 2d is overlapped on the second horizontal portion 8d of the intermediate airtight member 8 and the second horizontal portion 9a1d of the first connecting airtight member 9, and is connected to the intermediate airtight member 8 and the first connecting airtight member 9 with airtight tape or the like. To improve the airtightness of the boundaries between the wall airtight member 2d and the intermediate airtight member 8 and the first connecting airtight member 9, an airtight sealant can be filled between the wall airtight member 2d and the intermediate airtight member 8 and the first connecting airtight member 9. In addition, the portion of the wall airtight member 2d that overlaps with the wall retaining member 2b in the longitudinal direction of the beam 3 is fixed to at least one of the second connecting airtight member 10 and the wall retaining member 2b using airtight tape or the like.

The roof airtight member 4e is installed on the roof 4 along the upper surfaces of the roof retaining member 4b and the lower insulating member 4d2 before the roof facing member 4a, interposition member 4c, roof-side clamping member 4i, upper insulating member 4d1, roof finishing member 4f, cover 4g, and water-repellent member 4h are installed. Specifically, the portion of the inner end of the roof airtight member 4e between two adjacent wall retaining members 2b in the longitudinal direction of the beam 3 is positioned so as to overlap the first horizontal portion 8b of the intermediate airtight member 8 and is connected to the intermediate airtight member 8 with airtight tape or the like. The portion of the inner end of the roof airtight member 4e that overlaps with the wall retaining member 2b is connected to at least one of the first connecting airtight member 9 and the wall retaining member 2b with airtight tape or the like.

Furthermore, the airtight structure 1 is equipped with floor-side clamping members 2j and roof-side clamping members 4i for clamping the overlapping portions between the wall airtight member 2d and the roof airtight member 4e and the intermediate airtight member 8 and the beams 3 to improve airtightness at the overlapping portions.

The floor-side clamping member 2j bends the lower end of the wall airtight member 2d from the portion along the inner surface 2b2 of the wall retaining member 2b to the portion overlapping the intermediate airtight member 8, and clamps the overlapping portion of the wall airtight member 2d and the intermediate airtight member 8 between the floor surface material 5. Specifically, the floor-side clamping member 2j has a clamping surface 2j1 that clamps the overlapping portions of the wall airtight member 2d and the intermediate airtight member 8 between the floor surface material 5, and a rising surface 2j2 that rises from the clamping surface 2j1 and faces away from the exterior wall surface material 2a. The wall airtight member 2d is clamped between the floor-side clamping member 2j and the floor surface material 5 while being arranged along the clamping surface 2j1 and the rising surface 2j2. The floor-side clamping member 2j is fixed to at least one of the beam 3 and the wall retaining member 2b.

While this embodiment describes a configuration in which the wall airtight member 2d and relay airtight member 8 are connected between the floor-side clamping member 2j and the floor surface material 5, the manner in which the wall airtight member 2d and relay airtight member 8 are connected is not limited to this. For example, a separate relay member having a horizontal portion along the clamping surface 2j1 of the floor-side clamping member 2j and a vertical portion along the rising surface 2j2 of the floor-side clamping member 2j can be prepared, and the horizontal portion can be clamped between the clamping surface 2j1 and the floor surface material 5, with the wall airtight member 2d connected to the vertical portion using airtight tape or the like. This eliminates the need to fold the wall airtight member 2d under the floor-side clamping member 2j, improving workability. Alternatively, another intermediate airtight member may be prepared in which the second horizontal portion 8d extends to the corner between the clamping surface 2j1 and the rising surface 2j2 of the floor-side clamping member 2j and has a third horizontal portion extending upward from the second horizontal portion 8d along the rising surface 2j2, and the wall airtight member 2d is connected to the third horizontal portion using airtight tape or the like. Furthermore, the second horizontal portion 8d may be extended to the indoor side beyond the corner between the clamping surface 2j1 and the rising surface 2j2, and the wall airtight member 2d may be connected from above to the second horizontal portion 8d, and the second horizontal portion 8d and the wall airtight member 2d may be connected using a sealant.

As described above, the roof-side clamping member 4i is used to support the inner end of the roof panel 4a. The roof-side clamping member 4i also clamps the overlapping portions of the roof airtight member 4e and the intermediate airtight member 8 between the roof-side region RR of the beam 3. The roof-side clamping member 4i is fixed to at least one of the beam 3 and the wall retaining member 2b.

The floor-side clamping member 2j and roof-side clamping member 4i are attached from above to the intermediate airtight member 8 on the roof 4 before the roof surface material 4a, interposition member 4c, roof-side clamping member 4i, upper insulation material 4d1, roof finishing material 4f, cover 4g, and water-shedding member 4h are installed. While Figure 3 shows the floor-side clamping member 2j and roof-side clamping member 4i joined together, the floor-side clamping member 2j and roof-side clamping member 4i may be separate members.

As explained above, the exterior wall 2 and roof 4 are provided with insulating materials 2c and 4d and airtight members 2d and 4e, respectively, which prevents condensation from occurring in components including the insulating materials 2c and 4d. Specifically, the airtight members 2d and 4e are provided on the indoor side of the insulating materials 2c and 4d1, which prevents humid indoor air from entering the insulating materials 2c and 4d1 in winter, thereby preventing condensation from occurring in components including the insulating materials 2c and 4d1 on the outdoor side of the airtight members 2d and 4e due to cold outdoor air. On the other hand, the airtight member 4e is provided on the outdoor side of the insulating material 4d2, which prevents humid outdoor air from entering the insulating material 4d2 in summer, thereby preventing condensation from occurring in components including the insulating materials 4d2 on the indoor side of the airtight members 2d and 4e due to cold indoor air.

Furthermore, the wall airtight member 2d and the roof airtight member 4e are connected to each other through the area of the wall retaining member 2b on the side where the beam 3 is located, and through the area of the roof retaining member 4b on the side where the beam 3 is located. This makes it possible to continuously suppress condensation in components including the above-mentioned insulation materials 2c and 4d from the exterior wall 2 to the roof 4.

As a result, condensation can be effectively prevented from occurring in components including the insulation materials 2c and 4d installed on the exterior wall 2 of the upper floor UF supported by the beams 3 and the roof 4 of the lower floor DF extending from the beams 3 to the outside.

As shown in Figure 6, one possible configuration for connecting the wall airtight member 2d and the roof airtight member 4e to each other through the area of the wall retaining member 2b on the side where the beam 3 is located and the area of the roof retaining member 4b on the side where the beam 3 is located is a connection through the area on the interior side of the beam 3. However, in this case, because multiple components (floor materials in the example of Figure 6) are connected to the beam 3, the wall airtight member 2d and the roof airtight member 4e must be positioned to avoid interference with these components, making the configuration for connecting the two airtight members 2d and 4e complex.

In contrast, according to the first embodiment, the wall airtight member 2d and the roof airtight member 4e can be connected to each other by utilizing the space above the beam 3, i.e., the space between two wall retaining members 2b adjacent to each other in the longitudinal direction of the beam 3, thereby simplifying the configuration for connecting the two airtight members 2d and 4e.

One possible configuration for connecting the two airtight members 2d, 4e is to use sheet-like airtight members that can be relatively freely deformed as the two airtight members 2d, 4e, and use these to connect two adjacent wall retaining members 2b along the longitudinal direction of the beam 3. However, in this case, due to the degree of freedom in deformation of the airtight members 2d, 4e, it is difficult to position the airtight members 2d, 4e along the top surfaces of the beam 3 and floor material 5. If the airtight members 2d, 4e are positioned away from the beam 3 or floor material 5, they may be damaged by the influence of the surrounding structure of the beam 3 and floor material 5, resulting in a decrease in airtightness.

In contrast, in the first embodiment, the two airtight members 2d, 4e are connected to each other via an intermediate airtight member 8 that has a pre-defined shape that extends from the roof side region RR through the outer edge surface of the floor material 5 to the upper surface of the floor material 5. This reduces the influence of the surrounding structure of the beam 3 and floor material 5. As a result, airtightness can be maintained.

According to the first embodiment, the roof-side clamping member 4i clamps the overlapping portion of the roof airtight member 4e and the intermediate airtight member 8 between the beam 3, thereby maintaining a stable connection between the two airtight members 4e, 8. Furthermore, as described above, the roof-side clamping member 4i, which contributes to stabilizing the connection between the two airtight members 4e, 8, also serves as a member supporting the roof surface material 4a, making it possible to achieve both a stable connection and a reduced number of parts.

According to the first embodiment, the overlapping portion of the wall airtight member 2d and the intermediate airtight member 8 is clamped between the floor surface material 5 by the floor-side clamping member 2j, thereby maintaining a stable connection between the two airtight members 2d, 8. Furthermore, as described above, the floor-side clamping member 2j, which contributes to stabilizing the connection between the two airtight members 2d, 8, also serves as a member for positioning the wall airtight member 2d in the correct position and for redirecting and guiding it toward the intermediate airtight member 8, thereby achieving both a stable connection and a reduced number of parts.

According to the first embodiment, the beam side portion 9a1 and the retaining side portion 9a2 can form a continuous airtight line from the top surface of the beam 3 and floor material 5 to the side surface 2b3 of the wall retaining member 2b. Furthermore, by overlapping a portion of the intermediate airtight member 8 with the beam side portion 9a1, an airtight line can be formed along the complex surface shape formed by the beam 3, floor material 5, and wall retaining member 2b.

Furthermore, the beam-side portion 9a1 is pre-shaped to extend from the roof-side region RR through the outer end surface of the floor material 5 to the upper surface of the floor material 5. This allows the first connecting airtight member 9 to be positioned along the beam 3 and floor material 5, preventing damage to the airtight member due to influence from surrounding members, as would occur when using a sheet-shaped airtight member.

Figure 4 is a side cross-sectional view of an airtight structure for a building according to a second embodiment of the present invention. Referring to Figure 4, an airtight structure 1A according to the second embodiment of the present invention will be described. Note that in the airtight structure 1A, components similar to those in the previous embodiment will be assigned the same reference numerals, and their description will be omitted.

Unlike the first embodiment, the airtight structure 1A has the upper surface of the roof retaining member 4Ab set lower than the upper surface of the beam 3. Accordingly, the height dimension of the roof-side clamping member 4Ai is set smaller than the height dimension of the interposition member 4c.

In the airtight structure 1A, the wall airtight member 2d and the roof airtight member 4e are also connected to each other through the area of the wall retaining member 2b on the side where the beam 3 is located and the area of the roof retaining member 4Ab on the side where the beam 3 is located. The wall airtight member 2d and the roof airtight member 4e may be connected to each other directly or through at least one of the intermediate airtight member 8, the first connecting airtight member 9, and the second connecting airtight member 10. When the intermediate airtight member 8 is used, the roof airtight member 4e is positioned from the top surface of the roof retaining member 4Ab to the top surface of the beam 3 via the outer surface of the beam 3, thereby sandwiching the overlapping portion of the intermediate airtight member 8 and the roof airtight member 4e between the roof-side clamping member 4Ai and the beam 3. Alternatively, by positioning the roof airtight member 4e from the top surface of the roof retaining member 4Ab to the outer surface of the beam 3, the overlapping portion of the roof airtight member 4e and the first vertical portion 8a of the intermediate airtight member 8 can be connected using airtight tape or the like. In this case, the end of the roof airtight member 4e may be sandwiched between the upper insulation material 4d1 and the beam 3.

Figure 5 is a side cross-sectional view of an airtight structure for a building according to a third embodiment of the present invention. The airtight structure 1B according to the third embodiment will be described with reference to Figure 5. Note that in the airtight structure 1B, components similar to those in the previous embodiment are designated by the same reference numerals, and their description will be omitted.

In the airtight structure 1B, the roof surface material 4Ba is positioned below the upper surface of the beam 3. Accordingly, the airtight structure 1B has an interposition member 4Bc adjacent to the beam 3 that supports the inner end of the roof surface material 4Ba. The roof airtight member 4e is located between the upper surface of the roof support member 4b and the lower surfaces of the interposition members 4c and 4Bc.

In addition, since the roof surface material 4Ba is positioned below the upper surface of the beams 3, the airtight structure 1B further includes an adjustment member 12 for adjusting the floor level of the roof 4 to the floor level of the upper room UR.

In the airtight structure 1B, the wall airtight member 2d and the roof airtight member 4e are also connected to each other through the area of the wall retaining member 2b on the side where the beam 3 is located and the area of the roof retaining member 4b on the side where the beam 3 is located. The wall airtight member 2d and the roof airtight member 4e may be connected to each other directly or via at least one of the intermediate airtight member 8, the first connecting airtight member 9, and the second connecting airtight member 10. When the intermediate airtight member 8 is used, the first vertical portion 8a preferably has a length extending from the first horizontal portion 8b to the upper surface of the roof retaining member 4b, and the intermediate airtight member 8 preferably has an extension extending from the lower end of the first horizontal portion 8b between the intervening member 4Bc and the roof retaining member 4b. This allows the overlapping portion of the roof airtight member 4e and the intermediate airtight member 8 to be sandwiched between the intervening member 4Bc and the roof retaining member 4b.

Figure 6 is a side cross-sectional view of an airtight structure for a building according to a fourth embodiment of the present invention. Figure 7 is an exploded perspective view of a portion of the configuration shown in Figure 6. Figure 8 is an enlarged perspective view of the first connecting airtight member shown in Figure 7. An airtight structure 1C according to the fourth embodiment will be described with reference to Figures 6 to 8. Note that the airtight structure 1C has the same configuration as the airtight structure 1B shown in Figure 5, except for the wall airtight member 2d, roof airtight member 4e, intermediate airtight member 8, first connecting airtight member 9, and second connecting airtight member 10. Therefore, the same components as those in the airtight structure 1B are designated by the same reference numerals and their description will be omitted.

In airtight structure 1C, the wall airtight member and roof airtight member are connected to each other through the interior-side area of the beam 3, i.e., the area of the beam 3 opposite the wall retaining member, and the area of the beam 3 opposite the roof retaining member. Specifically, the wall airtight member and roof airtight member are connected to each other via the outer surface of the beam 3, the underside of the beam 3, and the inner surface of the beam 3. While at least one of the wall airtight member and the roof airtight member may be extended to directly connect the wall airtight member and the roof airtight member, in airtight structure 1C the wall airtight member and the roof airtight member are connected to each other via a member separate from the wall airtight member and the roof airtight member.

Specifically, the airtight structure 1C comprises a wall airtight member 2Cd, a roof airtight member 4Ce, an intermediate airtight member 8C that connects the wall airtight member 2Cd and the roof airtight member 4Ce, a first connecting airtight member 9C for connecting the wall airtight member 2Cd to the column 2bA, and a pair of second connecting airtight members 10C for connecting the roof airtight member 4Ce to the column 2bA. The column 2bA is connected to the beam 3 in a so-called column-first state. In other words, the beams 3 extend horizontally from both side surfaces 2b3 at the midpoint of the column 2bA in the vertical direction.

The intermediate airtight member 8C has a covering portion 8C1 that covers the outer edge of the floor material 5 from the outside, a wall-side connecting portion 8C2 that connects to the wall airtight member 2d, and a roof-side connecting portion 8C3 that connects to the roof airtight member 4e. The covering portion 8C1 has a predetermined shape that extends from the upper surface of the floor material 5, via the outer edge of the floor material 5, to the underside of the floor material 5. Specifically, the covering portion 8C1 has a first horizontal portion 8C1a that extends horizontally, a vertical portion 8C1b that extends downward from the outer edge of the first horizontal portion 8C1a, and a second horizontal portion 8C1c that extends inward from the lower edge of the vertical portion 8C1b. The wall-side connecting portion 8C2 extends upward from the inner edge of the first horizontal portion 8C1a. The roof-side connecting portion 8C3 extends downward from the inner edge of the second horizontal portion 8C1c.

The first connecting airtight member 9C has a pair of side portions 9C1 provided on both sides of the column 2bA in the longitudinal direction of the beam 3, and a connecting portion 9C2 that connects the pair of side portions 9C1 to each other in the longitudinal direction of the beam 3. The pair of side portions 9C1 have a shape that is symmetrical in the longitudinal direction of the beam 3 with the column 2bA as the reference. Each side portion 9C1 also has a covering portion 9C1a that covers the side edge of the groove 5a in the floor material 5 (and the covering portion 8C1 of the intermediate airtight member 8 that covers it), a wall-side connecting portion 9C1b that connects to the wall airtight member 2d, and a roof-side connecting portion 9C1c that connects to the intermediate airtight member 8C. The covering portion 9C1a has a predetermined shape that extends from the top surface of the floor material 5, via the end face of the floor material 5, to the underside of the floor material 5. Specifically, the covering portion 9C1a has a first horizontal portion 9C1a1 extending horizontally, a vertical portion 9C1a2 extending downward from the outer edge of the first horizontal portion 9C1a1, a second horizontal portion 9C1a3 extending inward from the lower edge of the vertical portion 9C1a2, and a connecting portion 9C1a4 connecting the first horizontal portion 9C1a1, the vertical portion 9C1a2, and the edge of the second horizontal portion 9C1a3 close to the column 2bA. The wall-side connecting portion 9C1b extends upward from the inner edge of the first horizontal portion 9C1a1. The roof-side connecting portion 9C1c extends downward from the inner edge of the second horizontal portion 9C1a3. As shown in FIG. 8, adhesive portions AD are provided at the connection portions 9C1a4 of the pair of side portions 9C1 and at both longitudinal edges of the beam 3 at the connecting portion 9C2, and the first connection airtight member 9C is connected to the column 2bA by the adhesive portions AD.

Because the pair of second connecting airtight members 10C have the same configuration, only one second connecting airtight member 10C will be described. The second connecting airtight member 10C has a pair of side portions 10C1 provided on both sides of the column 2bA in the longitudinal direction of the beam 3, and a connecting portion 10C2 that connects the pair of side portions 10C1 to each other in the longitudinal direction of the beam 3. The pair of side portions 10C1 have shapes that are symmetrical in the longitudinal direction of the beam 3 with respect to the column 2bA. Furthermore, each side portion 10C1 is intended to connect the underside of the beam 3, the side surface 2b3 of the column 2bA, and the intermediate airtight member 8. Specifically, each side portion 10C1 has a lower portion 10C1a that is pre-shaped to extend from the underside of the beam 3 to the side surface 2b3 of the column 2bA, and an extension portion 10C1b that extends upward from the inner edge of the portion of the lower portion 10C1a that follows the underside of the beam 3. The connecting portion 10C2 connects the inner edges of the portions of the lower portion 10C1a of the pair of side portions 10C1 that extend along the side surface 2b3 of the pillar 2bA, and also connects the extension portions 10C1b.

The intermediate airtight member 8C, the first connecting airtight member 9C, and the second connecting airtight member 10C are attached to the beam 3 and the column 2bA as follows:

First, the first connecting airtight member 9C is attached to the beam 3 and column 2bA from the inside. Next, the intermediate airtight member 8C is attached to the beam 3 and wall retaining member 2b so that the covering portion 8C1 is inserted into the covering portion 9C1a of the first connecting airtight member 9C, the groove 2bBa of the half column 2bB, and the groove 2bCa of the partition 2bC. In this state, the wall-side connecting portion 8C2 of the intermediate airtight member 8C is connected to the wall-side connecting portion 9C1b of the first connecting airtight member 9C using airtight tape or the like, and the roof-side connecting portion 8C3 of the intermediate airtight member 8C is connected to the roof-side connecting portion 9C1c of the first connecting airtight member 9C. Furthermore, a pair of second connecting airtight members 10C are attached to the beam 3 and column 2bA from both the inside and outside so that the lower portions 10C1a of both second connecting airtight members 10C overlap each other. In this state, both second connecting airtight members are connected to the beam 3 and column 2bA using airtight tape or the like.

The wall airtight member 2Cd and the roof airtight member 4Ce are then connected to each other using the intermediate airtight member 8C, the first connecting airtight member 9C, and the second connecting airtight member 10C. Specifically, the wall airtight member 2Cd is positioned along the inner surface of the wall retaining member 2b, and the lower end of the wall airtight member 2Cd is connected to the wall-side connecting portion 8C2 of the intermediate airtight member 8C and the wall-side connecting portion 9C1b of the first connecting airtight member 9C with airtight tape or the like. Meanwhile, the roof airtight member 4Ce is positioned from the intervening member 4Bc along the outer surface, underside, and inner surface of the beam 3, and is connected to the roof-side connecting portion 8C3 of the intermediate airtight member 8C and the roof-side connecting portion 9C1c of the first connecting airtight member 9C with airtight tape or the like. In addition, the area between the intervening member 4Bc of the roof airtight member 4Ce and the intermediate airtight member 8C and first connecting airtight member 9C is connected to the extension portion 10C1b and connecting portion 10C2 of the second connecting airtight member 10C using airtight tape or the like.

In the fourth embodiment, the wall airtight member 2Cd and the roof airtight member 4Ce are connected to each other through the area on the interior side of the beam 3, i.e., the area on the opposite side of the beam 3 from the wall retaining member 2b, and also through the area on the opposite side of the beam 3 from the roof retaining member 4b. Therefore, even if the wall retaining member 2b is erected on the beam 3, the wall airtight member 2Cd and the roof airtight member 4Ce can be connected while avoiding the wall retaining member 2b.

The present invention is not limited to the above-described embodiment, and the following aspects may also be adopted, for example:

In the above embodiment, a horizontal roof (a so-called flat roof) was used as an example, but the configuration of the above embodiment can also be applied to a sloped roof.

In the above embodiment, a configuration was described in which the wall airtight member 2d was provided inside the wall insulation material 2c, but the location of the wall airtight member 2d is not limited to this. For example, the wall airtight member 2d may be provided outside the wall insulation material 2c.

In the above embodiment, a configuration was described in which the roof airtight members 4e, 4Ce were provided between the upper insulation 4d1 and the lower insulation 4d2, but the position of the roof airtight members 4e, 4Ce is not limited to this. For example, the roof airtight members 4e, 4Ce may be disposed above or below the roof insulation 4d.

Although an intermediate airtight member 8 having a first vertical portion 8a has been illustrated, the first vertical portion 8a may also be omitted from the intermediate airtight member 8.

1, 1A, 1B, 1C Airtight structure 2 Exterior wall 2a Exterior wall surface material 2b Wall retaining member 2b1 Outer surface 2c Wall insulation material 2d, 2Cd Wall airtight member 2j Floor side clamping member 2j1 Clamping surface 2j2 Rising surface 3 Beam 4 Roof 4a, 4Ba Roof surface material 4b, 4Ab Roof retaining member 4d Roof insulation material 4e, 4Ce Roof airtight member 4i, 4Ai Roof side clamping member 5 Floor surface material 8, 8C Intermediate airtight member 9, 9A, 9B, 9C First connecting airtight member 9a1 Beam side portion 9a2 Retaining side portion DF Lower floor DR Lower room RR Roof side region UF Upper floor UR Upper room

Claims (5)

An airtight structure of a building having a lower floor and an upper floor provided above the lower floor,
The exterior wall of the upper floor;
a beam supporting the exterior wall;
a roof extending outward from the beams so as to cover the lower floor room from above;
The exterior wall includes an exterior wall surface material, a wall holding member that holds the exterior wall surface material and is erected on the beam, a wall insulation material provided inside the exterior wall surface material, and a wall airtight member that covers the room on the upper floor from the outside at a position inside the outer surface of the wall holding member,
The roof includes a roof surface material, a roof holding member that holds the roof surface material and extends outward from the beam, a roof insulation material provided below the roof surface material, and a roof airtight member that covers the room on the lower floor from above at a position below the roof surface material,
The wall airtight member and the roof airtight member are connected to each other through an area on the side of the wall holding member where the beam is located and an area on the side of the roof holding member where the beam is located ,
the exterior wall has a second wall retaining member that holds the exterior wall surface material and is erected on the beam at a position spaced apart from the wall retaining member in the longitudinal direction of the beam,
An airtight structure for a building, wherein the wall airtight member and the roof airtight member are connected to each other through the space between the wall retaining member and the second wall retaining member. The airtight structure of the building is
A floor surface material of an upper floor placed on the upper surface of the beam between the wall retaining member and the second wall retaining member with a roof side region of the upper surface of the beam close to the roof open;
The roof side area has a shape extending from the roof side area through the end surface of the floor surface material to the upper surface of the floor surface material, and the intermediate airtight member is arranged along the roof side area, the end surface and the upper surface of the floor surface material,
The airtight structure for a building according to claim 1 , wherein the wall airtight member and the roof airtight member are connected to each other via the intermediate airtight member. The airtight structure of the building further includes a roof-side clamping member that clamps the overlapping portions of the roof airtight member and the intermediate airtight member between the roof-side region of the beam and the roof-side clamping member,
The airtight structure for a building according to claim 2 , wherein the roof surface material is placed on the roof-side clamping member. The airtight structure of the building further includes a floor-side clamping member having a clamping surface that clamps the overlapping portions of the wall airtight member and the intermediate airtight member between the floor surface material and the clamping surface, and a rising surface that rises from the clamping surface so as to face away from the exterior wall surface material,
4. The airtight structure of a building as described in claim 2 or 3 , wherein the wall airtight member is clamped between the floor-side clamping member and the floor surface material while being arranged along the clamping surface and the rising surface. The airtight structure of the building further includes a connecting airtight member having a beam side portion having a shape extending from the roof side area through the end face of the floor surface material to the upper surface of the floor surface material, and a retaining side portion rising from an edge of the beam side portion close to the wall retaining member along the side of the wall retaining member,
The airtight structure for a building according to claim 2 or 3 , wherein the connecting airtight member is connected to the intermediate airtight member in a state where a part of the intermediate airtight member overlaps the beam side portion.