Airtight structure of building

Abstract

An outer wall (2) has an outer wall surface material (2a), a wall holding member (2b) that holds the outer wall surface material (2a) and is erected on a beam (3), a wall heat insulating material (2c) that is provided inside the outer wall surface material (2a), and a wall airtight member (2d) that covers a room of an upper floor (UF) from the outside at a position inside an outer surface (2b1) of the wall holding member (2b). A roof (4) has a roof surface material (4a), a roof holding member (4b) that holds the roof surface material (4a) and extends outward from the outer wall (2), a roof heat insulating material (4c) provided below the roof surface material (4a), and a roof airtight member (4d) that covers a room of a lower floor (DF) from above at a position below the roof surface material. The wall airtight member (2d) and the roof airtight member (4d) are connected to each other through a region on the indoor side with reference to the roof surface material (4a) and the outer surface (2b1) of the wall holding member (2b).

Description

Title of Invention AIRTIGHT STRUCTURE OF BUILDING Technical Field 10001] The present invention relates to an airtight structure provided in a building having a lower floor, an upper floor provided above the lower floor, and a roof extending from an outer wall of the upper floor to an outdoor side. Background Art

[0002] Conventionally, for example, a house described in Patent Literature 1 is known as a building having a lower floor and an upper floor. The house includes a beam material on an upper floor, an outer wall on the upper floor supported by the beam material, and an attached roof of a house overhang portion such as a lean-to roof protruding from the outer wall. |0003] The outer wall includes a frame having a plurality of vertical frame materials, bar materials, and the like, an exterior material attached to an outer surface of the frame, and a waterproof sheet that waterproofs a lower portion of an outer surface of the frame.

[0004] The attached roof includes a frame, a sheathing roof board attached to an upper surface of the frame, a roofing material provided on the sheathing roof board, and a roof waterproofing sheet covering the sheathing roof board between the roofing material and the sheathing roof board.

[0005] In the building described above, a heat insulating material may be provided on each of the outer wall and the roof in order to achieve heat insulation between the interior of the upper floor located inside the outer wall and the interior of the house overhang portion located below the house overhang roof and the exterior.

[0006] In this case, the outer wall needs to be provided with an airtight layer on the indoor side with respect to the outer surface of the frame in order to prevent dew condensation inside the heat insulating material. Similarly, in the house overhang portion, it is necessary to provide an airtight layer on the indoor side with respect to the upper surface of the frame in order to prevent dew condensation inside the heat insulating material.

[0007] However, Patent Literature 1 does not describe providing a heat insulating material and an airtight layer on an outer wall and a house overhang portion. Citation List Patent Literature

[0008] Patent Literature 1: JP 2000-45461 A Summary of Invention

[0009] An object of the present invention is to provide an airtight structure of a building capable of effectively suppressing generation of dew condensation on a member including a heat insulating material provided on an outer wall of an upper floor and a roof of a lower floor extending from the outer wall of the upper floor to an outdoor side.

[0010] In order to solve the above problems, the present invention provides an airtight structure 1 of a building having a lower floor and an upper floor provided on the lower floor, the airtight structure including an outer wall of the upper floor, a beam that supports the outer wall, and a roof extending outward from the outer wall so as to cover a room on the lower floor from above. The outer wall includes an outer wall surface material, a wall holding member that holds the outer wall surface material and is erected on the beam, a wall heat insulating material provided inside the outer wall surface material, and a wall airtight member that covers a room on the upper floor from outside at a position inside an 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 outer wall, a roof heat insulating material provided below the roof surface material, and a roof airtight member that covers a 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 a region on an indoor side with reference to outer surfaces of the roof surface material and the wall holding member.

[0011] According to the present invention, it is possible to effectively suppress dew condensation from occurring on a member including a heat insulating material provided on the outer wall of the upper floor and the roof of the lower floor extending from the outer wall of the upper floor to the outdoor side. Brief Description of Drawings

[0012] FIG. 1 is a side sectional view illustrating an airtight structure of a building according to a first embodiment of the present invention. FIG. 2 is a front view of a wall support member and an extension member in the airtight structure of FIG. 1 when viewed from the outside. FIG. 3 is an enlarged side sectional view illustrating a part of FIG. 1. FIG. 4 is a perspective view illustrating a connection state of the airtight member in FIG. 3. FIG. 5 is an enlarged perspective view illustrating a connection airtight member in FIG. 4. FIG. 6 is a side sectional view illustrating the airtight structure of the building according to the first embodiment of the present invention. Description of Embodiments

[0013] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that the following embodiments are examples embodying the present invention, and are not intended to limit the technical scope of the present invention.

[0014] FIG. 1 is a side sectional view illustrating an airtight structure of a building according to a first embodiment of the present invention. FIG. 2 is a front view of a wall support member and an extension member in the airtight structure of FIG. 1 when viewed from the outside.

[0015] Referring to FIGS. 1 and 2, an airtight structure 1 according to the first embodiment is provided in a building having a lower floor DF and an upper floor UF provided on the lower floor DF. Specifically, the airtight structure 1 includes an outer wall 2 of the upper floor UF, a 2 beam 3 supporting the outer wall 2, a roof 4 extending outward from the outer wall 2 so as to cover a lower room DR of the lower floor DF from above, a floor surface material 5 and an inner wall surface material 6 supported by the beam 3, and a ceiling surface material 7 suspended by the beam 3.

[0016] The floor surface material 5 and the inner wall surface material 6 are for partitioning an upper room UR of the upper floor UF. Specifically, the floor surface material 5 is fixed to the beam 3 in a state of being placed on the beam 3 so as to face the upper room UR. The inner wall surface material 6 is erected on the floor surface material 5 so as to face the upper room UR.

[0017] The ceiling surface material 7 constitutes the ceiling of the lower room DR. Specifically, the ceiling surface material 7 is hung on the beam 3 via a hanging member (not shown) in a state of facing the lower room DR.

[0018] The outer wall 2 includes an outer wall surface material 2a, a plurality of wall holding members 2b (see FIG. 2) that hold the outer wall surface material 2a and are erected on the beam 3, a plurality of wall heat insulating materials 2c provided inside the outer wall surface material 2a, and a wall airtight member 2d that covers the upper room UR from the outside at a position inside an outer surface 2b 1 of the wall holding member 2b.

[0019] The outer wall surface material 2a is attached to the plurality of wall holding members 2b such that a space for accommodating a part of the wall heat insulating material 2c is formed between the outer wall surface material 2a and the plurality of wall holding members 2b. Specifically, the outer wall surface material 2a is attached to the plurality of wall holding members 2b via a base material 2e fixed to the outer surfaces of the plurality of wall holding members 2b.

[0020] The plurality of wall holding members 2b are erected on the beam 3 at positions separated in the longitudinal direction (left-right direction in FIG. 2) of the beam 3. The plurality of wall holding members 2b are formed of, for example, columns, studs, and halfcolumns. Note that one of the plurality of wall holding members 2b is an example of the wall holding member, and the other is an example of a second wall holding member.

[0021] The plurality of wall heat insulating materials 2c include a plurality of outer heat insulating materials 2c 1 provided outside the wall holding member 2b and a plurality of inner heat insulating materials 2c2 provided inside the outer heat insulating material 2c 1. The plurality of outer heat insulating materials 2c 1 include those provided in a region above the base material 2e and those provided in a region below the base material 2e. The plurality of outer heat insulating materials 2c 1 are hard heat insulating materials formed of urethane foam or the like, for example. The plurality of inner heat insulating materials 2c2 are provided between two wall holding members 2b adjacent to each other in the longitudinal direction of the beam 3. Specifically, the outer wall 2 further includes an extension member 2f extending between two wall holding members 2b adjacent to each other in the longitudinal direction of the beam 3 and over the two wall holding members 2b. Each outer heat insulating material 2c 1 is provided in a region above the extension member 2f between two wall holding members 2b adjacent to each other. The plurality of inner heat insulating materials 2c2 are soft heat insulating materials formed of glass wool or the like, for example.

[0022] The wall airtight member 2d is provided inside the plurality of wall heat insulating materials 2c. Specifically, as illustrated in FIG. 3, the wall airtight member 2d has a portion disposed along an inner surface 2b2 of the wall holding member 2b and a portion disposed along the inner surface of the base material 2e. The wall airtight member 2d is a sheet (for example, a sheet made of polyethylene, polypropylene, polyethylene terephthalate, or the like) having airtightness.

[0023] Further, as illustrated in FIGS. 1 and 2, the outer wall 2 includes a placement member 2g that extends along the longitudinal direction of the beam 3 so as to cross the plurality of wall holding members 2b on the extension member 2f and is fixed to the outer surfaces 2b 1 of the plurality of wall holding members 2b. The placement member 2g has an upper surface 2g 1 inclined downward with increasing distance from the outer wall 2, and the roof 4 is placed on the upper surface 2g 1.

[0024] The roof 4 includes a roof surface material 4a, a plurality of roof holding members 4b (only one is illustrated in FIG. 1) that hold the roof surface material 4a and extend outward from the outer wall 2, a plurality of roof heat insulating materials 4c provided below the roof surface material 4a, and a roof airtight member 4d that covers the lower room DR from above at a position below the roof surface material 4a. Furthermore, the roof 4 includes a waterproof sheet 4e provided on the roof surface material 4a, a plurality of tile materials 4f provided on the waterproof sheet 4e, and a water drainage member 4g that protects a boundary portion between the tile material 4f and the outer wall 2 from rainwater or the like. The waterproof sheet 4e includes a laid portion laid on the roof surface material 4a, and a rising portion rising from the laid portion along an outer surface of the wall heat insulating material 2c (outer heat insulating material 2c 1). The water drainage member 4g includes a covering portion that covers the upper end portion of the uppermost tile material 4f, and a rising portion that rises from the covering portion so as to enter between the outer wall surface material 2a and the wall heat insulating material 2c (outer heat insulating material 2c 1).

[0025] The plurality of roof holding members 4b (only one member is shown in the drawing) are disposed apart from each other in the longitudinal direction of the beam 3, and are inclined downward from the outer wall 2 toward the outside. Specifically, the plurality of roof holding members 4b are attached to the outer wall 2 in a state of being placed on the upper surface 2gl of the placement member 2g provided on the outer wall 2. The outer heat insulating material 2c 1 of the outer wall 2 disposed below the base material 2e is provided between the lower surface of the base material 2e and the upper surface of the roof holding member 4b.

[0026] The roof surface material 4a extends over the plurality of roof holding members 4b and is fixed to the plurality of roof holding members 4b in a state of being placed on the plurality of roof holding members 4b.

[0027] The plurality of roof heat insulating materials 4c includes a plurality of upper heat 4 insulating materials 4c 1 provided between two roof holding members 4b adjacent to each other and a plurality of lower heat insulating materials 4c2 provided under the upper heat insulating materials 4cl (one each is illustrated in FIG. 1). The upper heat insulating material 4cl is provided at a position below the upper surface of the roof holding member 4b so that a ventilation passage is formed between the upper heat insulating material 4c 1 and the roof surface material 4a. The lower surface of the upper heat insulating material 4c 1 is disposed on the same plane as the lower surface of the roof holding member 4b, and the tip portion of the upper heat insulating material 4c 1 is placed on the upper surface 2g 1 of the placement member 2g of the outer wall 2. Further, the upper heat insulating material 4c 1 is connected to the outer surface of the wall heat insulating material 2c (outer heat insulating material 2c 1). The plurality of lower heat insulating materials 4c2 sandwich a part of the roof airtight member 4d between the plurality of lower heat insulating materials 4c2 and the plurality of upper heat insulating materials 4c 1. That is, the upper heat insulating material 4c 1 is provided on the roof airtight member 4d. Further, the plurality of lower heat insulating materials 4c2 sandwich a part of the roof airtight member 4d between the plurality of lower heat insulating materials 4c2 and an outer surface 2g2 of the placement member 2g. The upper heat insulating material 4c 1 and the lower heat insulating material 4c2 are attached to the roof holding member 4b via an attachment member (not illustrated) in a state of being arranged as described above. The upper heat insulating material 4c 1 and the lower heat insulating material 4c2 are made of, for example, a hard heat insulating material made of urethane foam or the like.

[0028] The roof airtight member 4d is provided under the upper heat insulating material 4c 1. Specifically, as illustrated in FIG. 3, the roof airtight member 4d has a portion sandwiched between the upper heat insulating material 4c 1 and the lower heat insulating material 4c2, and a portion disposed along the outer surface of the placement member 2g (a portion sandwiched between the lower heat insulating material 4c2 and the outer surface 2g2 of the placement member 2g). The roof airtight member 4d is a sheet (for example, a sheet made of polyethylene, polypropylene, polyethylene terephthalate, or the like) having airtightness.

[0029] The wall airtight member 2d and the roof airtight member 4d are connected to each other through the region on the indoor side with reference to the roof surface material 4a and the outer surface 2b 1 of the wall holding member 2b. That is, the wall airtight member 2d and the roof airtight member 4d are connected to each other through a region below the roof surface material 4a and inside a plane including the outer surface 2b 1 of the wall holding member 2b. Specifically, the wall airtight member 2d and the roof airtight member 4d are connected to each other through a portion between the wall holding members 2b adjacent to each other in the longitudinal direction of the beam 3. More specifically, the wall airtight member 2d and the roof airtight member 4d are connected to each other through a portion below the extension member 2f.

[0030] Even in a case where the wall holding member 2b is made of wood or metal, the wall holding member 2b can be handled as a member having airtightness. Therefore, the wall 5 airtight member 2d and the roof airtight member 4d need to be connected to the wall holding member 2b.

[0031] The connection of the wall airtight member 2d, the roof airtight member 4d, and the wall holding member 2b as described above can also be realized by expanding at least one of the wall airtight member 2d and the roof airtight member 4d and using the wall airtight member 2d and the roof airtight member 4d. However, in the first embodiment, the above connection is realized via an airtight member other than the wall airtight member 2d and the roof airtight member 4d.

[0032] FIG. 4 is a perspective view illustrating a connection state of the airtight member in FIG. 3. FIG. 5 is an enlarged perspective view of the connection airtight member in FIG. 4.

[0033] Referring to FIGS. 3 to 5, the airtight structure 1 further includes a relay airtight member 8 disposed along an outer surface 2fl, a lower surface 2f2, and an inner surface 2f3 of the extension member 2f, a connection airtight member 9 disposed across the extension member 2f and the wall holding member 2b, and an interpolation airtight member 10 disposed across the placement member 2g, the wall holding member 2b, and the extension member 2f. The relay airtight member 8, the connection airtight member 9, and the interpolation airtight member 10 are made of an airtight material (for example, polyethylene, polypropylene, polyethylene terephthalate, or the like).

[0034] The relay airtight member 8 has in advance a shape extending from the outer surface 2fl of the extension member 2f to the inner surface 2f3 of the extension member 2f via the lower surface 212 of the extension member 2f. That is, the relay airtight member 8 is a molded article having an outer portion 8a disposed along the outer surface 2fl, a lower portion 8b disposed along the lower surface 2f2, and an inner portion 8c disposed along the inner surface 213. In addition, the relay airtight member 8 has a longitudinal dimension that can overlap the connection airtight member 9 provided at each end portion of the extension member 2f in the longitudinal direction of the beam 3. Specifically, as illustrated in FIG. 3, both end portions of the relay airtight member 8 are disposed so as to overlap a portion of the connection airtight member 9, which will be described later, disposed along the extension member 2f, and a central portion of the relay airtight member 8 is disposed along the extension member 2f.

[0035] The connection airtight member 9 has in advance a shape extending from the outer surface 2fl of the extension member 2f and the outer surface 2b 1 of the wall holding member 2b to the inner surface 2f3 of the extension member 2f and the inner surface 2b2 of the wall holding member 2b via the lower surface 212 of the extension member 2f and a side surface 2b3 of the wall holding member 2b. That is, the connection airtight member 9 is a molded article having an outer portion 9a disposed along the outer surfaces 2fl and 2b 1, an inner portion 9c disposed along the inner surfaces 2f3 and 2b2, and an intermediate portion 9b provided between the outer portion 9a and the inner portion 9c and disposed along the lower surface 2:12 and the side surface 2b3. In addition, the connection airtight member 9 is bonded to the extension member 2f and the wall holding member 2b in bonding regions 9al and 9c 1 along the boundary portion with the 6 intermediate portion 9b in the outer portion 9a and the inner portion 9c, and a pair of bonding regions 9b 1 corresponding to both edge portions in the intermediate portion 9b. |0036] The interpolation airtight member 10 has a shape extending from the outer surface 2g2 of the placement member 2g to the outer surfaces 2b 1 and 2fl of the wall holding member 2b and the extension member 2f via a lower surface 2g3 of the placement member 2g in advance. That is, the interpolation airtight member 10 includes a first outer portion 10a arranged along the outer surface 2g2 of the placement member 2g, a lower portion 10b arranged along the lower surface 2g3 of the placement member 2g, and a second outer portion 10c arranged along the outer surfaces 2b 1 and 2fl of the wall holding member 2b and the extension member 2f.

[0037] As illustrated in FIG. 3, a portion of the roof airtight member 4d disposed along the outer surface 2g2 of the placement member 2g is connected to the first outer portion 10a by an airtight tape or the like while overlapping the first outer portion 10a of the interpolation airtight member 10 from the outside. The second outer portion 10c of the interpolation airtight member 10 is connected to the outer portions 8a and 9a by an airtight tape or the like in a state of overlapping the outer portion 8a of the relay airtight member 8 and the outer portion 9a of the connection airtight member 9 from the outside. A portion of the wall airtight member 2d disposed along the inner surface 2f3 of the extension member 2f is connected to the inner portions 8c and 9c by an airtight tape or the like in a state of overlapping the inner portion 8c of the relay airtight member 8 and the inner portion 9c of the connection airtight member 9 from the inside. In addition, the portion of the wall airtight member 2d disposed along the wall holding member 2b is connected to the connection airtight member 9 or the wall holding member 2b by an airtight tape or the like in a state of overlapping the inner portion 9c of the connection airtight member 9 or the inner surface 2b2 of the wall holding member 2b from the inside.

[0038] As illustrated in FIGS. 3 and 4, the outer portion 8a of the relay airtight member 8 is connected to the outer portion 9a by an airtight tape or the like in a state of overlapping a part of the outer portion 9a of the connection airtight member 9 from the outside. The lower portion 8b of the relay airtight member 8 is connected to the intermediate portion 9b by an airtight tape or the like in a state of overlapping a part of the intermediate portion 9b of the connection airtight member 9 from below. The inner portion 8c of the relay airtight member 8 is connected to the inner portion 9c by an airtight tape or the like in a state of overlapping a part of the inner portion 9c of the connection airtight member 9 from the inside.

[0039] As illustrated in FIG. 5, the connection airtight member 9 is connected to the wall holding member 2b and the extension member 2f via the bonding regions 9a 1, 9b 1, and 9c 1. As illustrated in FIG. 2, when the wall holding member 2b has a different thickness, the outer portion 9a and the inner portion 9c of the two connection airtight members 9 adjacent to each other can be disposed to overlap each other.

[0040] As described above, the wall airtight member 2d, the roof airtight member 4d, and the wall holding member 2b are airtightly connected via the airtight members 8 to 10.

[0041] As described above, according to the first embodiment, the wall heat insulating material 7 2c, the roof heat insulating material 4c (hereinafter, collectively referred to as heat insulating materials 2c and 4c), the wall airtight member 2d, and the roof airtight member 4d (hereinafter, collectively referred to as airtight members 2d and 4d) are provided on the outer wall 2 and the roof 4, respectively. Therefore, it is possible to suppress the occurrence of dew condensation on the members including the heat insulating materials 2c and 4c. Specifically, the wall airtight member 2d is provided on the indoor side of the wall heat insulating material 2c, and the roof airtight member 4d is provided on the indoor side of the upper heat insulating material 4c 1. Therefore, by suppressing high-humidity indoor air from entering the heat insulating materials 2c and 4c 1 in the winter season, it is possible to suppress generation of dew condensation on the members including the heat insulating materials 2c and 4c 1 provided on the outdoor side of the airtight members 2d and 4d by the outdoor cool air. Further, the roof airtight member 4d is provided on the outdoor side of the upper heat insulating material 4c 1. Therefore, by suppressing high-humidity outdoor air from entering the upper heat insulating material 4c 1 in the summer season, it is possible to suppress generation of dew condensation on the member including the upper heat insulating material 4c 1 provided on the indoor side of the roof airtight member 4d by the indoor cool air.

[0042] Furthermore, the wall airtight member 2d and the roof airtight member 4d are connected to each other through a region on the indoor side with reference to the roof surface material 4a and the outer surface 2b 1 of the wall holding member 2b, that is, a region below the roof surface material 4a and inside a plane including the outer surface 2b 1 of the wall holding member 2b. As a result, it is possible to suppress the occurrence of dew condensation on the member including the heat insulating materials 2c and 4c described above continuously from the outer wall 2 to the roof 4.

[0043] Therefore, it is possible to effectively suppress dew condensation from occurring on the members including the heat insulating materials 2c and 4c provided on the outer wall 2 of the upper floor UF and the roof 4 of the lower floor DF extending from the outer wall 2 of the upper floor UF to the outdoor side.

[0044] As a configuration for connecting the wall airtight member 2d and the roof airtight member 4d to each other through the region on the indoor side with reference to the roof surface material 4a and the outer surface 2b 1 of the wall holding member 2b, connection through the region on the indoor side of the beam (connection along a path DL indicated by a two-dot chain line in FIG. 1) is assumed. However, in this case, since a plurality of members (for example, the floor surface material 5 in FIG. 1 or a beam (not shown) may be used) are connected to the beam 3, it is necessary to arrange the wall airtight member 2d and the roof airtight member 4d so as to avoid interference with these members, and the configuration for connecting both the airtight members 2d and 4d becomes Complicated.

[0045] On the other hand, according to the first embodiment, since the wall airtight member 2d and the roof airtight member 4d can be connected to each other using the space on the beam 3, that is, the space between the two wall holding members 2b adjacent to each other, the configuration for connecting both the airtight members 2d and 4d can be simplified.

[0046] Furthermore, in the first embodiment, since the extension member 2f extending over the two wall holding members 2b adjacent to each other is provided, it is possible to form a region for installing the wall heat insulating member (inner heat insulating material 2c2) on the extension member 2f in the space between the wall holding members 2b. Furthermore, since the wall airtight member 2d is provided inside the wall heat insulating material 2c and is connected to the roof airtight member 4d through a portion below the extension member 2f, it is possible to connect both the airtight members 2d and 4d through a portion below the wall heat insulating material 2c (extension member 2f) while suppressing the dew condensation on the wall heat insulating material 2c in the winter described above.

[0047] In the first embodiment, the roof heat insulating material (upper heat insulating material 4c 1) is provided on the roof airtight member 4d and connected to the wall heat insulating material (inner heat insulating material 2c2), so that both the heat insulating members 2c2 and 4c 1 can be continued in the region on the outdoor side of both the airtight members 2d and 4d. Therefore, continuous heat insulation performance can be secured from the roof 4 to the outer wall 2, and dew condensation on the member including the heat insulating materials 2c2 and 4c 1 can be suppressed in winter.

[0048] As a configuration for connecting both the airtight members 2d and 4d, for example, it is conceivable to adopt a sheet-like airtight member whose shape can be relatively freely changed as both the airtight members 2d and 4d and to connect them to each other under the extension member 2f using these members. However, in this case, due to the degree of freedom of deformation of the airtight members 2d and 4d, it is difficult to arrange both the airtight members 2d and 4d along the inner surface, the lower surface, and the outer surface of the extension member 2f. When the airtight members 2d and 4d are disposed away from the extension member 2f, the airtight members 2d and 4d are damaged by the influence of the configuration around the extension member 2f, and the airtight performance may be deteriorated.

[0049] On the other hand, in the first embodiment, both the airtight members 2d and 4d are connected to each other via the relay airtight member 8 having a shape extending from the outer surface 2f 1 of the extension member 2f to the inner surface 213 via the lower surface 2f2 in advance. Therefore, it is possible to reduce the influence of the configuration around the extension member 2f and maintain the airtight performance.

[0050] Regardless of whether the wall holding member 2b and the extension member 2f are made of wood or metal, the wall holding member 2b and the extension member 2f can be handled as having airtightness. Therefore, when both the airtight members 2d and 4d are connected between two wall holding members 2b adjacent to each other through a portion below the extension member 2f, both the airtight members 2d and 4d need to be connected to the wall holding member 2b and the extension member 2f. However, since the wall holding member 2b and the extension member 2f are members extending in directions intersecting each other, when a sheet-like airtight member having a relatively high degree of freedom of deformation is adopted as both the airtight members 2d and 4d, it is difficult to arrange the airtight members 2d and 4d along the wall holding member 2b and the extension member 2f. When the airtight members 2d and 4d are disposed away from at least one of the wall holding member 2b and the extension member 2f, the airtight members 2d and 4d may be damaged by the influence of the configuration around the wall holding member 2b and the extension member 2f, and the airtight performance may be deteriorated.

[0051] On the other hand, in the first embodiment, both the airtight members 2d and 4d are connected to the wall holding member 2b and the extension member 2f via the connection airtight member 9 having a shape in advance from the outer surfaces 2b 1 and 2fl of the wall holding member 2b and the extension member 2f to the inner surfaces 2b2 and 213 of the wall holding member 2b and the extension member 2f via the lower surface 212 of the extension member 2f and the side surface 2b3 of the wall holding member 2b. Therefore, it is possible to reduce the influence of the configuration around the wall holding member 2b and the extension member 2f, and it is possible to maintain the airtight performance. 10052] In the first embodiment, the roof airtight member 4d held by the roof holding member 4b has been described, but the arrangement of the roof airtight member 4d is not limited thereto. The roof airtight member 4d need only cover the lower room DR from above at a position below the upper surface 4b 1 of the roof holding member 4b.

[0053] For example, as in an airtight structure 1A of a second embodiment illustrated in FIG. 6, a roof airtight member 4Ad may be disposed so as to cover the lower room DR from above below the roof holding member 4b. In this case, an upper heat insulating material 4Acl and a lower heat insulating material 4Ac2 may be disposed below the roof holding member 4b so as to sandwich the roof airtight member 4Ad.

[0054] Also in the second embodiment, the roof airtight member 4Ad and the wall airtight member 2d are connected to each other through the region on the indoor side with reference to the roof surface material 4a and the outer surface 2b 1 of the wall holding member 2b.

[0055] Note that the present invention is not limited to the above embodiments, and for example, the following aspects can also be adopted.

[0056] In the above embodiment, the inclined roof has been described as an example, but the configuration of the above embodiment can also be applied to a flat roof.

[0057] In the above embodiment, the configuration in which the wall airtight member 2d is provided inside the wall heat insulating material 2c has been described, but the position of the wall airtight member 2d is not limited thereto. For example, the wall airtight member 2d may be provided outside the wall heat insulating material 2c.

[0058] In the above embodiment, the description has been given of the configuration in which the roof airtight members 4d and 4Ad are provided between the upper heat insulating material 4c 1 and the lower heat insulating material 4c2, but the positions of the roof airtight members 4d and 4Ad are not limited thereto. For example, the roof airtight members 4d and 4Ad may be disposed above or below the roof heat insulating material 4c. 10

[0059] Note that the above-described specific embodiments mainly include inventions having the following configurations.

[0060] In order to solve the above problems, the present invention provides an airtight structure of a building having a lower floor and an upper floor provided on the lower floor, the airtight structure including an outer wall of the upper floor, a beam that supports the outer wall, and a roof extending outward from the outer wall to cover a room on the lower floor from above. The outer wall includes an outer wall surface material, a wall holding member that holds the outer wall surface material and is erected on the beam, a wall heat insulating material provided inside the outer wall surface material, and a wall airtight member that covers a room on the upper floor from outside at a position inside an 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 outer wall, a roof heat insulating material provided below the roof surface material, and a roof airtight member that covers a 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 a region on an indoor side with reference to outer surfaces of the roof surface material and the wall holding member.

[0061] According to the present invention, since the heat insulating material and the airtight member are provided on either the outer wall and the roof, it is possible to suppress the occurrence of dew condensation on the member including the heat insulating material. Specifically, when the airtight member is provided on the indoor side of the heat insulating material, it is possible to suppress the generation of dew condensation on the member including the heat insulating material provided on the outdoor side of the airtight member by the outdoor cool air by suppressing the air with high humidity in the room from entering the heat insulating material in the winter season. On the other hand, when the airtight member is provided on the outdoor side of the heat insulating material, it is possible to suppress generation of dew condensation on the member including the heat insulating material provided on the indoor side of the airtight member due to indoor cool air by suppressing entry of air with high humidity outside the room into the heat insulating material in the summer season.

[0062] Further, the wall airtight member and the roof airtight member are connected to each other through a region on the indoor side with reference to the outer surfaces of the roof holding surface material and the wall holding member, that is, a region below the roof surface material and inside a plane including the outer surface of the wall holding member. As a result, it is possible to suppress the occurrence of dew condensation on the member including the heat insulating materials described above continuously from the outer wall to the roof.

[0063] Therefore, according to the present invention, it is possible to effectively suppress dew condensation from occurring on a member including a heat insulating material provided on the outer wall of the upper floor and the roof of the lower floor extending from the outer wall of the upper floor to the outdoor side.

[0064] In the airtight structure of the building, preferably, the outer wall includes a second wall 11 holding member that holds the outer wall surface material and is erected on the beam at a position away from the wall holding member in a longitudinal direction of the beam, and the wall airtight member and the roof airtight member are connected to each other through a portion between the wall holding member and the second wall holding member.

[0065] As a configuration for connecting the wall airtight member and the roof airtight member to each other through the region on the indoor side with reference to the outer surfaces of the roof surface material and the wall holding member, connection through the region on the indoor side of the beam is assumed. However, in this case, since a plurality of members are connected to the beam, it is necessary to arrange the wall airtight member and the roof airtight member so as to avoid interference with these members, and the configuration for connecting both the airtight members becomes complicated.

[0066] On the other hand, according to the above configuration, since the wall airtight member and the roof airtight member can be connected to each other using the space on the beam, that is, the space between the wall holding member and the second wall holding member, the configuration for connecting both the airtight members can be simplified.

[0067] In the airtight structure of the building, preferably, the outer wall includes an extension member extending between the wall holding member and the second wall holding member and across the wall holding member and the second wall holding member, the wall heat insulating material is provided in a region above the extension member between the wall holding member and the second wall holding member and outside the wall airtight member, and the wall airtight member and the roof airtight member are connected to each other through a portion under the extension member.

[0068] According to the above configuration, since the extension member extending over both the wall holding members is provided, it is possible to form a region for installing the wall heat insulating member on the extension member which is a space between both the wall holding members. Furthermore, since the wall airtight member is provided inside the wall heat insulating material and is connected to the roof airtight member through a portion below the extension member, it is possible to connect both the airtight members through a portion below the wall heat insulating material (extension member) while suppressing the dew condensation on the wall heat insulating material in the winter described above.

[0069] In the airtight structure of the building, the roof heat insulating material is preferably provided on the roof airtight member and connected to an outer surface of the wall heat insulating material.

[0070] According to the above configuration, since the roof heat insulating material is provided on the roof airtight member and connected to the wall heat insulating material, both the heat insulating materials can be continued in the region on the outdoor side of both the airtight members. Therefore, continuous heat insulation performance can be secured from the roof to the outer wall, and dew condensation on the member including the heat insulating materials can be suppressed in winter.

[0071] Preferably, the airtight structure of a building further includes a relay airtight member that has in advance a shape extending from an outer surface of the extension member to an inner surface of the extension member via a lower surface of the extension member, and is disposed along the outer surface, the lower surface, and the inner surface of the extension member, in which the wall airtight member and the roof airtight member are connected to each other via the relay airtight member.

[0072] As a configuration for connecting both the airtight members, for example, it is conceivable to adopt a sheet-like airtight member whose shape can be relatively freely changed as both the airtight members and to connect them to each other under the extension member using these members. However, in this case, due to the degree of freedom of deformation of the airtight members, it is difficult to arrange both the airtight members along the inner surface, the lower surface, and the outer surface of the extension member. When the airtight members are disposed away from the extension member, the airtight members are damaged by the influence of the configuration around the extension member, and the airtight performance may be deteriorated.

[0073] On the other hand, in the above configuration, both the airtight members are connected to each other via the relay airtight member having in advance a shape extending from the outer surface to the inner surface via the lower surface of the extension member, and thus, it is possible to reduce the influence of the configuration around the extension member. Therefore, airtight performance can be maintained.

[0074] Preferably, the airtight structure of the building further includes a connection airtight member that has a shape extending in advance from outer surfaces of the extension member and the wall holding member to an inner surface of the extension member and the wall holding member via a lower surface of the extension member and a side surface of the wall holding member, and is disposed across the extension member and the wall holding member, and the wall airtight member and the roof airtight member are connected to the wall holding member via the connection airtight member.

[0075] Regardless of whether the wall holding member and the extension member are made of wood or metal, the wall holding member and the extension member can be handled as having airtightness. Therefore, when both the airtight members are connected between the wall holding member and the second wall holding member through a portion below the extension member, both the airtight members need to be connected to the wall holding member and the extension member. However, since the wall holding member and the extension member are members extending in directions intersecting each other, when a sheet-like airtight member having a relatively high degree of freedom of deformation is adopted as both the airtight members, it is difficult to arrange the airtight members along the wall holding member and the extension member. When the airtight members are disposed away from at least one of the wall holding member and the extension member, the airtight members are damaged by the influence of the configuration around the wall holding member and the extension member, and the airtight 13 performance may be deteriorated.

[0076] On the other hand, in the above configuration, both the airtight members are connected to the wall holding member and the extension member via a connection airtight member having a shape in advance from the outer surfaces of the extension member and the wall holding member to the inner surfaces of the extension member and the wall holding member via the lower surface of the extension member and the side surface of the wall holding member. Therefore, it is possible to reduce the influence of the configuration around the wall holding member and the extension member, and it is possible to maintain the airtight performance.

Claims

1. An airtight structure of a building having a lower floor and an upper floor provided on the lower floor, the airtight structure comprising:an outer wall of the upper floor;a beam that supports the outer wall; anda roof extending outward from the outer wall to cover a room on the lower floor from above,wherein the outer wall includes an outer wall surface material, a wall holding member that holds the outer wall surface material and is erected on the beam, a wall heat insulating material provided inside the outer wall surface material, and a wall airtight member that covers a room on the upper floor from outside at a position inside an 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 outer wall, a roof heat insulating material provided below the roof surface material, and a roof airtight member that covers a room on the lower floor from above at a position below the roof surface material, andthe wall airtight member and the roof airtight member are connected to each other through a region on an indoor side with reference to outer surfaces of the roof surface material and the wall holding member.

2. The airtight structure of a building according to claim 1, whereinthe outer wall includes a second wall holding member that holds the outer wall surface material and is erected on the beam at a position away from the wall holding member in a longitudinal direction of the beam, andthe wall airtight member and the roof airtight member are connected to each other through a portion between the wall holding member and the second wall holding member.

3. The airtight structure of a building according to claim 2, whereinthe outer wall includes an extension member extending between the wall holding member and the second wall holding member and across the wall holding member and the second wall holding member,the wall heat insulating material is provided in a region above the extension member between the wall holding member and the second wall holding member and outside the wall airtight member, andthe wall airtight member and the roof airtight member are connected to each other through a portion under the extension member.

4. The airtight structure of a building according to claim 3, wherein the roof heat insulating material is provided on the roof airtight member and is connected to an outer surfaceof the wall heat insulating material.

5. The airtight structure of a building according to claim 3 or 4, further comprising a relay airtight member that has in advance a shape extending from an outer surface of the extension member to an inner surface of the extension member via a lower surface of the extension member, and is disposed along the outer surface, the lower surface, and the inner surface of the extension member,wherein the wall airtight member and the roof airtight member are connected to each other via the relay airtight member.

6. The airtight structure of a building according to any one of claims 3 to 5, further comprising a connection airtight member that has in advance a shape extending from outer surfaces of the extension member and the wall holding member to inner surfaces of the extension member and the wall holding member via a lower surface of the extension member and a side surface of the wall holding member, and is disposed across the extension member and the wall holding member,wherein the wall airtight member and the roof airtight member are connected to the wall holding member and the extension member via the connection airtight member.

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