JP7220045B2 - Airtight structures and buildings - Google Patents

Description

TECHNICAL FIELD The present invention relates to an airtight structure provided with an airtight layer along an outer peripheral wall of a building, and a building provided with the airtight structure.

2. Description of the Related Art Conventionally, in order to improve the airtightness of a building such as a house, an airtight layer is formed so as to cover the indoor space from the outside using a heat insulating material or the like placed on the indoor side of the outer peripheral wall (outer wall).

For example, in Patent Document 1, an exterior wall material that constitutes the outer wall of a building, a pillar as a skeleton that supports the exterior wall material, an airtight heat insulating material that is arranged between the exterior wall material and the pillar, , and an airtight structure is disclosed in which the indoor side surface of a heat insulating material and the indoor side surface of a structural member such as a pillar are airtightly connected via an airtight backing material. With such a configuration, the airtight layer can be formed along the indoor side surface of the heat insulating material arranged along the outer peripheral wall of the building.

JP-A-2004-76316

However, in Patent Document 1, the airtight layer is formed inside the heat insulating layer, and for example, there are cases where it is difficult to ensure the continuity of the airtight layer due to wiring and piping drilling work that is performed after the heat insulating and airtight work. There was room for improvement in terms of the airtightness of the building.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an airtight structure and a building that can improve the airtightness of the building.

The present invention relates to an airtight structure of a building in which a ventilation layer communicating with the outside of the building is not provided between an exterior wall material constituting an outer peripheral wall and a frame supporting the exterior wall material,
The outer peripheral wall is composed of an outer wall material and has an opening in which the outer wall material is partially discontinuous,
At the opening, a moisture-permeable waterproof sheet arranged so as to cover the gap communicating with the indoor space is directly or indirectly connected to the outer wall material in an airtight manner, thereby forming the outer wall. An airtight layer including the material and the moisture-permeable waterproof sheet is formed.

In addition, in the airtight structure of the present invention, it is preferable that the airtight layer is formed on the outdoor side of a heat insulating layer arranged along the indoor side surface of the outer peripheral wall.

Further, in the airtight structure of the present invention, it is preferable that another airtight layer is formed along the indoor side surface of the heat insulating layer.

Further, in the airtight structure of the present invention, it is preferable that at least part of the moisture-permeable waterproof sheet is connected to the frame, and the frame forms part of the airtight layer.

Moreover, in the airtight structure of the present invention, it is preferable that the moisture-permeable waterproof sheet is connected to the surface of an airtight base material arranged so as to cover the uneven portions of the frame.

Moreover, in the airtight structure of the present invention, it is preferable that the moisture-permeable waterproof sheet is adhered to another member with an airtight tape.

Moreover, in the airtight structure of the present invention, it is preferable that at least one side of the moisture-permeable waterproof sheet is adhered to the surface of the steel material forming the frame.

Further, in the airtight structure of the present invention, the outer wall material is preferably made of any one of lightweight cellular concrete, PC concrete, and extruded cement board.

Moreover, the building of this invention is equipped with one of said airtight structures, It is characterized by the above-mentioned.

ADVANTAGE OF THE INVENTION According to this invention, the airtight structure which can raise the airtightness of a building more, and a building can be provided.

1 is a vertical sectional view showing an airtight structure as an embodiment of the present invention; FIG. FIG. 4 is a perspective view showing an example of a method of connecting moisture-permeable waterproof sheets at joints of beams. 3 is a perspective view showing a state in which the moisture-permeable waterproof sheet and the airtight base material in FIG. 2 are connected using an airtight tape. FIG.

Hereinafter, an airtight structure of a building according to one embodiment of the present invention will be described with reference to the drawings. In addition, the same code|symbol is attached|subjected to the structure which is common in each figure.

FIG. 1 is a diagram showing an airtight structure 1 of a building 100 according to the present embodiment, and shows a vertical cross-sectional view (longitudinal cross-sectional view) of eaves such as a veranda partially protruding from an outer peripheral wall 2 of the building 100. FIG. ing. The airtight structure 1 of the present invention can be applied to areas other than the eaves as long as the outer wall material 3 forming the outer peripheral wall 2 is an opening 4 that is partially discontinuous.

Here, the overall configuration of the building 100 as an example of the present invention will be described. Building 100 can be, for example, a two-story house with a steel frame. Also, the building 100 is composed of, for example, a foundation structure fixed to the ground and an upper structure fixed on the foundation structure.

The foundation structure is positioned below the upper structure and supports the framework thereof. The upper structure includes a framework (framework) composed of a plurality of pillars and a plurality of beams 5 installed between the pillars, an outer peripheral wall 2 arranged on the outer peripheral side of the framework, and on the beams of the framework. and a floor and a roof of each floor to be arranged.

The airtight structure 1 of the present invention uses the outer peripheral wall 2 of the building 100 to form an airtight layer. Therefore, the building 100 to which the present invention can be applied has a ventilation system that communicates with the outside of the building 100 between the outer wall material 3 that constitutes the outer wall 2 and the framework such as the beams 5 and columns that support the outer wall material 3. It is assumed that no layers are provided. That is, it is assumed that the building does not adopt the so-called "ventilation layer construction method," in which, for example, a ventilation layer is provided between the exterior wall material and the heat insulating material, and the moisture that has entered the wall is released to the outside through the ventilation layer.

As shown in FIG. 1 , a building 100 includes exterior wall materials 3 that form an outer peripheral wall 2 and beams 5 as structural members that form a framework that supports the exterior wall materials 3 . In this example, a plurality of panel-shaped outer wall materials 3 are arranged in a continuous manner to form the outer peripheral wall 2 .

Specific examples of the exterior wall material 3 include panels of lightweight cellular concrete (hereinafter referred to as "ALC", "ALC" being an abbreviation for "autoclaved light weight concrete"), PC concrete panels, and extruded concrete. A molded cement board or the like can be used, but the specific configuration such as the material and shape of the outer wall material 3 is not particularly limited as long as it is airtight (impermeable to air). By connecting this outer wall material 3 to the outer peripheral side of beams 5, columns, etc., which are structural members constituting the building frame, the outer peripheral wall 2 can be formed as an outer skin layer. The joints between the adjacent exterior wall materials 3 are sealed if necessary. Thus, the surface of the outer peripheral wall 2 formed by the outer wall material 3 having airtightness constitutes a part of the airtight layer.

The beams 5 are arranged along the outer peripheral wall of the building 100, extend horizontally, and are supported by a plurality of pillars. The beam 5 of this example is made of H-section steel having a web 5a, and an upper flange 5b and a lower flange 5c respectively connected to the upper and lower ends of the web 5a. Note that the shape and material of the beam 5 can be changed as appropriate.

The upper flange 5b and the lower flange 5c of the beam 5 are formed with a plurality of through holes for passing the bolts 7 and the like. A connection member 6 made of a steel material having an inverted T-shaped cross section is fixed to the upper flange 5b by fastening members such as bolts 7 and nuts 8. A steel material having an L-shaped cross section is attached to the lower flange 5c. A connection member 9 is fixed by a fastening member such as a bolt 7 and a nut 8 . The connection member 9 is applied to the surface of the exterior wall material 3b on the indoor side, and is fastened and fixed using fastening members such as bolts.

In FIG. 1, the outer wall material 3a positioned above the opening 4 is supported by connecting members 6 fixed to the beams 5. As shown in FIG. Further, the outer wall material 3b located on the lower side of the opening 4 is supported by a connection member 9 fixed to the lower flange 5c of the beam 5. As shown in FIG. That is, in this example, the exterior wall materials 3a and 3b are each indirectly supported by the building frame such as the beam 5, but it is not limited to this, and may be directly supported by the building frame such as the beam 5. A supporting member 10 made of steel having a substantially Z-shaped cross section is fixed to the connecting member 9 . The supporting member 10 sandwiches the upper end portion of the outer wall material 3b together with the connecting member 9, thereby restricting the movement of the outer wall material 3b in the front-rear direction.

An upper floor member is arranged on the upper surface of the upper flange 5b of the beam 5. As shown in FIG. The floor member may be, for example, a floor panel 11 made of an ALC panel (lightweight cellular concrete panel), but is not limited to this and can be changed as appropriate. In this example, a filling member 12 such as mortar is provided to fill the gap between the floor panel 11 and the exterior wall material 3a. By filling the gap between the floor panel 11 and the outer wall material 3a with the filling member 12 in this way, the airtightness from the outer wall material 3a to the upper flange 5b of the beam 5 is ensured more reliably.

A heat insulating layer is formed on the indoor side of the exterior wall material 3 . The illustrated heat insulating layer includes a panel-shaped heat insulating material 20 arranged along the indoor side surface of the exterior wall material 3a and a panel-shaped heat insulating material 21 arranged along the indoor side surface of the external wall material 3b. , panel-shaped heat insulating materials 22 , 23 , 24 arranged on the indoor side of the beam 5 . The heat insulating material 22 is arranged along the lower surface of the lower flange 5c of the beam 5, and the heat insulating material 23 is arranged on the opposite side of the beam 5 from the exterior wall material 3 and parallel to the web 5a. 24 is arranged along the lower surface of the floor panel 11 of the upper floor. Moreover, the heat insulators 21, 22, 23, and 24 are continuously connected. In addition, the heat insulating materials 20, 21, 22, 23, and 24 of this example have airtightness, and other airtight layers ( airtight layer on the indoor side). In this example, the heat insulation layer is arranged so as to pass through the indoor side of the beam 5 , but it is not limited to this, and the heat insulation layer may be arranged so as to pass through the outdoor side of the beam 5 .

As the heat insulating materials 20 to 24, for example, in addition to panel-shaped heat insulating materials made of foamed resin materials such as phenol foam, polystyrene foam, and urethane foam, fiber-based heat insulating materials such as rock wool have airtightness. It can also be used with films.

An interior material is arranged on the indoor side of the heat insulating layer. As the interior material, for example, a gypsum board or the like can be used. In addition, in FIGS. 1 to 3, the interior materials are omitted for convenience of explanation.

As shown in FIG. 1, the building 100 has eaves formed by veranda floor panels 30 or the like arranged to project from the outer peripheral wall 2 at a height between the first and second floors, for example. . In this example, an opening 4 is formed inside the root portion of the eaves so that the outer wall material 3 is discontinuous. More specifically, the opening 4 is formed between the outer wall material 3a and the outer wall material 3b. there is

In such an opening 4 of the outer peripheral wall 2, a moisture-permeable waterproof sheet 13 is arranged so as to cover the gap communicating with the indoor space from the outdoor side. Also, the moisture-permeable waterproof sheet 13 is connected to the outer peripheral wall 2 (outer wall material 3) directly or indirectly via another member while ensuring airtightness. Incidentally, when the moisture-permeable waterproof sheet 13 is airtightly connected to the outer peripheral wall 2 (outer wall material 3), each member from the moisture-permeable waterproof sheet 13 to the outer wall material 3 is continuously connected without gaps. It means that they are connected, thereby ensuring the airtightness of the connection between each member. As a result, an airtight layer is formed so as to be continuous with the outer wall material 3 also at the opening 4 of the outer peripheral wall 2 . In other words, an airtight layer including the outer peripheral wall 2 and the moisture-permeable waterproof sheet 13 is formed in the building 100 . In this example, an airtight layer including the outer peripheral wall 2 and the moisture permeable waterproof sheet 13 is formed on the outdoor side of the heat insulating layer.

Here, the "gap communicating with the indoor space" in the opening 4 means a gap formed between various members such as structural members, connecting members, and heat insulating materials and communicating with the indoor space, and various members such as structural members themselves. It is a hole or the like that is formed in the interior space and continues to the indoor space. As shown in FIG. 2, in this example, holes 16 that can be used for wiring, piping, etc. formed in the beam 5, holes 17 for fastening members such as bolts, etc. Equivalent to. The holes 16 and 17 are covered with the moisture-permeable waterproof sheet 13 from the outdoor side, and by connecting directly or indirectly to the outer wall material 3 while ensuring airtightness, an airtight layer continuous to the outer peripheral wall 2 is formed. there is Further, for example, even if gaps communicating with the indoor space are formed between the beam 5 and the connection member 9 or between the connection member 9 and the support member 10, these gaps can be filled with the moisture permeable waterproof sheet. Airtightness is ensured by covering with 13 .

Here, the moisture-permeable waterproof sheet 13 has predetermined moisture-permeability and waterproofness in addition to airtightness. The moisture-permeable waterproof sheet 13 can satisfy the standard described in JIS-A6111, for example. Specifically, the moisture permeable waterproof sheet 13 preferably has a moisture permeation resistance of 0.19 (m ² ·s·Pa)/μg or less as measured by JIS A1324 (cup method). With such a configuration, sufficient moisture permeability is provided while ensuring airtightness, so moisture from the indoor side of the airtight layer can be appropriately discharged to the outside. In addition, the moisture-permeable waterproof sheet 13 preferably has a waterproofness (water pressure) of 10 kPa or more as measured by the hydrostatic pressure method specified in JIS L1092. According to such a configuration, it is possible to more reliably prevent moisture from entering the indoor side of the airtight layer. As the moisture-permeable waterproof sheet 13 that satisfies the above performance, for example, a high-density polyethylene nonwoven fabric such as Tyvek (registered trademark) manufactured by DuPont can be used.

The moisture-permeable waterproof sheet 13 of this example is formed in a strip shape. As shown in FIGS. 1 to 3, the upper end portion 13a of the moisture-permeable waterproof sheet 13 is connected to the upper portion of the outdoor-side surface of the web 5a of the beam 5. As shown in FIGS. The moisture-permeable waterproof sheet 13 can be airtightly connected to other members such as the beams 5 by, for example, an airtight tape. The airtight tape may be a single-sided adhesive type having an adhesive layer on only one side or a double-sided adhesive type having an adhesive layer on both sides. Specifically, the airtight tape includes butyl tape or the like, and when connecting the moisture-permeable waterproof sheet 13 to another member, only one type of airtight tape or a combination of multiple types of airtight tapes can be used. .

In this example, a double-sided adhesive type airtight tape is placed between one surface of the upper end portion 13a of the moisture-permeable waterproof sheet 13 and the outdoor surface of the web 5a, and the airtight tape is affixed to each other. The moisture proof sheet 13 and the beams 5 are connected while ensuring airtightness. Incidentally, it is also possible to connect the moisture-permeable waterproof sheet 13 and the beams 5 in an airtight state by using a single-sided adhesive type airtight tape.

Here, in this example, as also shown in FIGS. 2 and 3, an airtight base material 14 is arranged on the upper end surface of the outer wall material 3b. The airtight base material 14 has airtightness and flexibility to be elastically deformable. As a specific example of the airtight base material 14, for example, a member made of band-shaped independent foam EPDM having a predetermined thickness can be used. The airtight base material 14 is adhered to the upper end face of the outer wall material 3b with a double-sided adhesive type airtight tape, whereby the airtight base material 14 is connected to the outer wall material 3b in an airtight state. Further, the upper surface 14a of the airtight base material 14 is located on the same plane as the upper surface 10a of the support member 10. As shown in FIG. In this example, the upper surface 14a of the airtight base material 14 and the upper surface 10a of the support member 10 constitute a flat surface that is continuously arranged.

As shown in FIG. 2, the lower end portion 13b of the moisture-permeable waterproof sheet 13 is adhered to the upper surface 14a of the airtight base material 14 and the upper surface 10a of the support member 10 with double-sided adhesive airtight tape. In addition, in the portion where the support member 10 is provided, the gap between the upper end surface of the outer wall material 3b and the lower surface of the support member 10 is closed by the airtight base material 14 to ensure airtightness. Thus, in this example, the lower end portion 13b of the moisture-permeable waterproof sheet 13 is connected to the outer wall material 3b through the airtight base material 14 and the support member 10 in an airtight state.

In this example, the airtight base material 14 closes the gap between the support member 10 and the upper end surface of the outer wall material 3b to ensure airtightness. 10a can be eliminated, the lower end portion 13b of the moisture-permeable waterproof sheet 13 can be easily connected to the outer wall material 3b.

FIGS. 2 and 3 schematically show a connecting portion between the beam 5 shown in FIG. 1 and another beam 15 orthogonal to the beam 5. FIG. The side ends 13c of the moisture-permeable waterproof sheet 13 can be connected to an airtight backing material 18 arranged so as to be fitted in the connecting portion between the beams 5 and 15, as shown in FIG. 2, for example. Note that the airtight base material 14 and the airtight base material 18 are not essential components. That is, the lower end portion 13b of the moisture permeable waterproof sheet 13 may be directly connected to the exterior wall material 3b, or the lateral end portion 13c of the moisture permeable waterproof sheet 13 may be directly connected to the beams 5 or 15. When the airtight base material 14 and the airtight base material 18 are not used, for example, gaps (gaps communicating with the indoor space) that cannot be covered by the moisture-permeable waterproof sheet 13 are filled with an airtight material such as an airtight gap filler or an airtight tape. can be blocked with Also, gaps that may occur between the airtight base material 18 and the beams 5 can be closed with an airtight material such as an airtight gap filler or an airtight tape.

The airtight base material 18 can be made of an airtight plastic-based foam such as foamed polyethylene. At the connecting portion of the two orthogonal beams 5 and 15, there are uneven portions caused by fastening members such as bolts 7 and gaps between the members (gaps communicating with the indoor space). Such uneven portions and gaps are covered with a rectangular parallelepiped or a block-shaped airtight base material 18 having an L-shaped plan view, and the moisture permeable waterproof sheet 13 is placed on the flat surface (side surface) of the airtight base material 18. By connecting the side ends 13c, the airtightness of the connecting portion of the beams 5 and 15 can be ensured. In addition, by configuring the side surface of the airtight base material 18 with a flat surface as shown in the illustrated example, the lateral ends 13c of the moisture-permeable waterproof sheet 13 can be easily connected. In addition, by using the airtight base material 18, it is possible to easily connect the moisture-permeable waterproof sheet 13 in a simple shape such as a rectangle without processing it into a complicated shape.

As shown in FIG. 3, by sticking a single-sided adhesive type airtight tape 19 so as to cover the connecting portion between the side end portion 13c of the moisture-permeable waterproof sheet 13 and the airtight backing material 18, the permeation can be easily performed. The moisture proof sheet 13 can be connected to the airtight backing material 18 while ensuring airtightness. As shown in FIG. 3, the moisture-permeable waterproof sheet 13 can be similarly connected to the side of the beam 15 perpendicular to the beam 5, and the airtightness can be improved more effectively.

As described above, in the airtight structure 1 of the present embodiment, the continuity of the airtight layer using the surface of the outer peripheral wall 2 is ensured even in the opening 4 where the outer wall material 3 is partially discontinuous. be able to. That is, according to the airtight structure 1 of this embodiment, a continuous airtight layer can be formed along the surface of the outer peripheral wall 2 of the building 100 . In addition, by increasing the airtightness of the building 100, it is possible to prevent the deterioration of the insulation due to air leakage, so that the insulation of the building 100 can be improved.

Here, in the case where the airtight layer is formed only inside the heat insulating layer as in the past, there is a risk that the continuity of the airtight layer will be lost due to the drilling work for wiring and piping that is performed after the heat insulating and airtight work. By forming a continuous airtight layer along the surface of the outer peripheral wall 2 as in the airtight structure 1 of the embodiment, such a problem can be solved and the continuous airtight layer can be ensured. Furthermore, by reliably providing an airtight layer, it is possible to suppress warm air from escaping through gaps, reduce heat loss, and facilitate planned ventilation.

In addition, since the moisture-permeable waterproof sheet 13, which constitutes a part of the airtight layer, is flexible and has excellent conformability, it can easily conform to members with complicated shapes such as steel materials having fine unevenness. can be connected. Therefore, it is difficult for a gap to be formed in the connecting portion between the moisture-permeable waterproof sheet 13 and other members, so that high airtightness can be secured, and construction is easy.

In addition, by using the moisture-permeable waterproof sheet 13, it is possible to prevent dew condensation on the indoor side of the exterior wall material 3 by releasing moisture from the indoor space side to the outside while suppressing rainwater and the like from entering from the outside. can.

In this example, an airtight layer including the outer peripheral wall 2 and the moisture permeable waterproof sheet 13 is formed on the outdoor side of the heat insulating layer. By adopting such a structure, the airtight layer interferes less with structural members such as steel materials compared to the case where the airtight layer is formed on the indoor side of the heat insulating layer. Construction is also easy. Therefore, the airtightness of the building 100 can be efficiently improved. In addition, by forming an airtight layer including the outer peripheral wall 2 and the moisture-permeable waterproof sheet 13 on the outdoor side of the heat insulating layer, another airtight layer formed along the indoor side surface of the heat insulating layer is formed as in this example. It can be combined with layers (other hermetic layers). As a result, the airtightness of the building 100 can be improved more effectively, and the heat insulation is also improved.

In this example, the upper end portion 13a of the moisture-permeable waterproof sheet 13 is connected to the surface of the web 5a of the beam 5. As shown in FIG. Such a configuration makes it difficult for the moisture-permeable waterproof sheet 13 to come off. That is, the surface of the beam 5 is a smooth flat surface with few minute irregularities, and compared to the surfaces of the airtight base materials 14 and 18, for example, the adhesive force of the airtight tape is more likely to be exerted strongly, so that peeling does not occur. it gets harder. From this point of view, it is preferable that at least part of the moisture-permeable waterproof sheet 13 is connected (attached) to the frame such as the beams 5 or the like. Moreover, in order to support the own weight of the moisture-permeable waterproof sheet 13, it is particularly preferable that the upper end portion 13a of the moisture-permeable waterproof sheet 13 is adhered to the frame such as the beam 5 or the like.

In addition, by connecting the upper end portion 13a of the moisture-permeable waterproof sheet 13 to the surface of the web 5a extending in the vertical direction, for example, compared to the case of connecting to the surface extending in the horizontal direction such as the lower surface of the upper flange 5b As a result, the moisture-permeable waterproof sheet 13 has high durability when its own weight acts on the connecting portion (attached portion) in the vertical direction, and the moisture-permeable waterproof sheet 13 is more difficult to peel off. Therefore, it is preferable that the upper end portion 13a of the moisture-permeable waterproof sheet 13 is adhered to the surface extending in the vertical direction.

The airtight structure and building according to the present invention are not limited to the configurations of the above-described embodiments, and can be realized by various configurations without departing from the scope of the claims. be. For example, in the present embodiment, the opening 4 of the outer peripheral wall 2 is covered with a moisture-permeable waterproof sheet 13 and other airtight members (beams 5, connection members 6 and 9, support member 10, filling member 12, airtight base material). 14) is used to secure the airtightness, but the present invention is not limited to this, and the opening 4 may be arranged so as to be closed only with the moisture permeable waterproof sheet 13 .

Further, in the present embodiment, only one side (upper end 13a) of the moisture-permeable waterproof sheet 13 is connected to the beam 5, and the other three sides (lower end 13b and side end 13c) are connected to other members. , but not limited to this, the connecting points of the sides of the moisture-permeable waterproof sheet 13 can be changed as appropriate. In addition, the shape of the moisture-permeable waterproof sheet 13 can also be changed as appropriate. For example, in the opening 4 of the outer peripheral wall 2, the shape may correspond to the shape of the holes 16, 17, etc. that constitute the gap communicating with the indoor space. .

In addition, in the opening 4 of the outer peripheral wall 2, it is not necessary to cover all the gaps communicating with the indoor space with the moisture permeable waterproof sheet 13, and only part of the gap communicating with the indoor space is covered with the moisture permeable waterproof sheet 13. The airtightness of the airtight layer may be ensured by covering the remaining portion with another airtight member such as an airtight tape.

1: airtight structure 2: outer wall 3, 3a, 3b: outer wall material 4: opening 5: beam (framework)
5a: web 5b: upper flange 5c: lower flange 6: connecting member 7: bolt (fastening member)
8: Nut (fastening member)
9: Connection member 10: Support member 11: Floor panel 12: Filling member 13: Moisture-permeable waterproof sheet 13a: Upper end of moisture-permeable waterproof sheet 13b: Lower end of moisture-permeable waterproof sheet 13c: Side edge of moisture-permeable waterproof sheet Part 14: Airtight base material 15: Beam 16, 17: Hole (gap communicating with indoor space)
18: Airtight base material 19: Airtight tape 20, 21, 22, 23, 24: Heat insulating material 30: Veranda floor 100: Building

Claims (8)

An airtight structure of a building comprising an outer peripheral wall composed of an outer wall material and a frame supporting the outer wall material,
A heat insulating layer arranged along the indoor side surface of the outer peripheral wall,
The outer peripheral wall has an opening in which the outer wall material is partially discontinuous,
Between the outer peripheral wall and the heat insulating layer, no ventilation layer communicating with the outside of the building through the opening is provided,
At the opening, a moisture-permeable waterproof sheet that satisfies the standards described in JIS A6111 , which is arranged so as to cover the gap communicating with the indoor space, is directly or indirectly secured to the outer wall material to ensure airtightness. By connecting with, an airtight layer having a predetermined airtightness including the outer wall material and the moisture permeable waterproof sheet is formed on the outdoor side of the heat insulating layer,
An airtight structure, wherein an airtight layer is formed along an indoor side surface of the heat insulating layer. 2. The airtight structure according to claim 1 , wherein at least part of said moisture-permeable waterproof sheet is connected to said frame, and said frame constitutes a part of said airtight layer. 3. The airtight structure according to claim 1 , wherein said moisture-permeable waterproof sheet is connected to the surface of an airtight base material arranged so as to cover uneven portions of said frame. The airtight structure according to any one of claims 1 to 3 , wherein the moisture-permeable waterproof sheet is attached to another member with an airtight tape. 5. The airtight structure according to claim 4 , wherein at least one side of said moisture-permeable waterproof sheet is adhered to a surface of a steel material forming said frame. The airtight structure according to any one of claims 1 to 5 , wherein the outer wall material is composed of one of lightweight cellular concrete, PC concrete, and extruded cement board. An airtight structure of a building comprising an outer peripheral wall composed of an outer wall material and a frame supporting the outer wall material,
A heat insulating layer arranged along the indoor side surface of the outer peripheral wall,
The outer peripheral wall has an opening in which the outer wall material is partially discontinuous,
Between the outer peripheral wall and the heat insulating layer, no ventilation layer communicating with the outside of the building through the opening is provided,
At the opening, a moisture-permeable waterproof sheet that satisfies the standards described in JIS A6111 , which is arranged so as to cover the gap communicating with the indoor space, is directly or indirectly secured to the outer wall material to ensure airtightness. By connecting with, an airtight layer having a predetermined airtightness including the outer wall material and the moisture permeable waterproof sheet is formed on the outdoor side of the heat insulating layer,
An airtight structure, wherein the moisture-permeable waterproof sheet is connected to a surface of an airtight base material arranged to cover the irregularities of the frame. A building comprising the airtight structure according to any one of claims 1 to 7 .

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