JP2020056174A - Airtight structure and building - Google Patents

Abstract

To provide an airtight structure capable of further enhancing airtightness of a building, and the building.SOLUTION: In an airtight structure 1 of a building 100 in which a ventilation layer communicating with the outside is not provided between an outer wall material 3 constituting an outer peripheral wall 2 and a skeleton 5, the outer peripheral wall 2 is composed of the outer wall material 3 and has an opening part 4 in which the outer wall material 3 is partially discontinuous. In the opening part 4, a moisture-permeable waterproof sheet 13 arranged so as to cover a gap communicating with an indoor space is connected to the outer wall material 3 directly or indirectly via another member in a state of securing airtightness, thereby forming an airtight layer including the outer wall material 3 and the moisture-permeable waterproof sheet 13.SELECTED DRAWING: Figure 1

Description

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

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

  For example, Patent Literature 1 discloses an outer wall material constituting an outer peripheral wall of a building, a pillar as a skeleton supporting the outer wall material, a heat-insulating material having airtightness and disposed between the outer wall material and the pillar, An airtight structure is disclosed in which an indoor surface of a heat insulating material and an indoor surface of a structural member such as a pillar are connected while maintaining airtightness via an airtight base material. With this configuration, the airtight layer can be formed along the indoor surface of the heat insulating material disposed along the outer peripheral wall of the building.

JP 2004-76316 A

  However, in Patent Document 1 described above, an airtight layer is formed inside the heat insulating layer. For example, there are cases where continuity of the airtight layer is difficult to be ensured due to wiring performed after the heat insulating airtight work, drilling work of piping, or the like. There was room for improvement in the airtightness of the building.

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

The present invention is an airtight structure of a building in which a ventilation layer communicating with the outside of the building is not provided between an outer wall material constituting an outer peripheral wall and a skeleton supporting the outer wall material,
The outer peripheral wall is formed of an outer wall material, and has an opening in which the outer wall material is partially discontinuous,
In the opening, a moisture-permeable waterproof sheet disposed so as to cover a gap communicating with the indoor space is directly or indirectly connected to the outer wall material in a state of ensuring airtightness, whereby the outer wall is An airtight layer including a material and the moisture-permeable waterproof sheet is formed.

  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 surface of the outer peripheral wall.

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

  In the airtight structure according to the present invention, it is preferable that at least a part of the moisture-permeable waterproof sheet is connected to the skeleton, and the skeleton forms a part of the airtight layer.

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

  In the airtight structure according to the present invention, it is preferable that the moisture-permeable waterproof sheet is attached to another member with an airtight airtight tape.

  Further, in the airtight structure according to the present invention, it is preferable that at least one side of the moisture-permeable waterproof sheet is attached to a surface of a steel material constituting the skeleton.

  Further, in the airtight structure of the present invention, it is preferable that the outer wall material is made of any of lightweight cellular concrete, PC concrete, and an extruded cement plate.

  Further, a building according to the present invention includes any one of the above-described airtight structures.

  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 according to an embodiment of the present invention. It is a perspective view which shows an example of the connection method of a moisture-permeable waterproof sheet in the connection part of a beam. FIG. 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.

  Hereinafter, an airtight structure of a building according to an embodiment of the present invention will be described with reference to the drawings. Note that the same components are denoted by the same reference numerals in each drawing.

  FIG. 1 is a diagram showing an airtight structure 1 of a building 100 of the present embodiment, and shows a vertical sectional view (longitudinal sectional view) of an eave portion such as a veranda that partially projects from an outer peripheral wall 2 of the building 100. ing. In addition, the airtight structure 1 of the present invention is applicable to other than the eaves as long as the outer wall material 3 constituting the outer peripheral wall 2 is an opening 4 where the outer wall material 3 is partially discontinuous.

  Here, an overall configuration of a building 100 as an example of the present invention will be described. The building 100 can be, for example, a two-story house having a steel frame. The building 100 includes, for example, a foundation structure fixed to the ground and an upper structure fixed to the foundation structure.

  The foundation structure is located below the upper structure and supports the skeleton, and may be, for example, a reinforced concrete cloth foundation having a T-shaped cross section. The upper structure includes a frame (frame) composed of a plurality of columns and a plurality of beams 5 erected between the columns, an outer peripheral wall 2 arranged on the outer peripheral side of the frame, and a beam on the frame. A floor and a roof of each floor to be arranged.

  Note that the hermetic structure 1 of the present invention uses an outer peripheral wall 2 of the building 100 to form an hermetic layer. Therefore, in the building 100 to which the present invention can be applied, the ventilation communicating with the outside of the building 100 is provided between the outer wall member 3 constituting the outer peripheral wall 2 and the frame such as the beam 5 and the column supporting the outer wall member 3. It is assumed that no layers are provided. That is, for example, it is assumed that the building does not employ a so-called "venting layer method" in which a ventilation layer is provided between the outer 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, the building 100 includes an outer wall member 3 forming the outer peripheral wall 2 and a beam 5 as a structural member forming a skeleton supporting the outer wall member 3. In the present example, a plurality of panel-shaped outer wall members 3 are arranged in series to form the outer peripheral wall 2.

  Specific examples of the outer wall material 3 include, for example, a panel of lightweight cellular concrete (hereinafter referred to as “ALC”; “ALC” is an abbreviation of “autoclaved light weight concrete”), a PC concrete panel, and an extrusion. A molded cement plate 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 has airtightness (impermeable to air). By connecting the outer wall material 3 to the outer peripheral side of a beam 5, a column, or the like as a structural member constituting the skeleton, the outer peripheral wall 2 as a skin layer can be formed. In addition, sealing is performed to the joint part between the adjacent outer wall materials 3 as needed. In this way, 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 beam 5 is arranged along the outer peripheral wall of the building 100, extends in the horizontal direction, and is supported by a plurality of columns. The beam 5 of this example is made of an H-section steel having a web 5a, and an upper flange 5b and a lower flange 5c connected to upper and lower ends of the web 5a, respectively. In addition, the shape and material of the beam 5 can be appropriately changed.

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

  In FIG. 1, an outer wall material 3 a located above the opening 4 is supported by a connecting member 6 fixed to the beam 5. The outer wall member 3b located below the opening 4 is supported by a connecting member 9 fixed to a lower flange 5c of the beam 5. In other words, in this example, the outer wall members 3a and 3b are indirectly supported by the skeleton such as the beam 5, respectively. However, the configuration is not limited thereto, and the outer wall members 3a and 3b may be directly supported by the skeleton such as the beam 5. Note that a support member 10 made of a steel material having a substantially Z-shaped cross section is fixed to the connection member 9. The support member 10 regulates the movement of the outer wall member 3b in the front-rear direction by sandwiching the upper end of the outer wall member 3b together with the connection member 9.

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

  A heat insulating layer is formed on the indoor side of the outer wall material 3. The heat insulating layer in the illustrated example includes a panel-shaped heat insulating material 20 arranged along the indoor surface of the outer wall material 3a, and a panel heat insulating material 21 arranged along the indoor surface of the outer 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 5 c of the beam 5, and the heat insulating material 23 is arranged on the opposite side of the outer wall material 3 with respect to the beam 5 and is arranged in parallel with the web 5 a. Reference numeral 24 is arranged along the lower surface of the floor panel 11 on the upper floor. Further, the heat insulating materials 21, 22, 23, 24 are continuously connected. Further, the heat insulating materials 20, 21, 22, 23, and 24 of the present example have airtightness, and together with the floor panel 11 and the like connected in a state where airtightness is secured, another airtight layer surrounding the indoor space ( (Airtight layer on the indoor side). In this example, the heat insulating layer is disposed so as to pass through the indoor side of the beam 5. However, the present invention is not limited to this, and the heat insulating layer may be disposed 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 a panel-shaped heat insulating material made of a foamed resin material such as phenol foam, polystyrene foam, and urethane foam, a fiber heat insulating material such as rock wool was airtight. It can also be used with a film.

  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 FIGS. 1 to 3, the interior materials are omitted for convenience of explanation.

  As shown in FIG. 1, the building 100 includes an eave portion including a veranda floor panel 30 arranged to protrude from the outer peripheral wall 2 at a height between the first floor and the second floor, for example. . In this example, an opening 4 where the outer wall material 3 is discontinuous is formed inside the eaves root portion, and more specifically, the opening 4 is formed between the outer wall material 3a and the outer wall material 3b. I have.

  In such an opening 4 of the outer peripheral wall 2, a moisture-permeable waterproof sheet 13 is arranged so as to cover a gap communicating with the indoor space from the outdoor side. The moisture-permeable waterproof sheet 13 is connected to the outer peripheral wall 2 (outer wall material 3) directly or indirectly via another member in a state where airtightness is ensured. In addition, that the moisture-permeable waterproof sheet 13 is connected to the outer peripheral wall 2 (outer wall material 3) in a state where airtightness is secured means that each member from the moisture-permeable waterproof sheet 13 to the outer wall material 3 is continuously provided with no gap. This means that they are connected, whereby the airtightness of the connection between the members is ensured. Thereby, an airtight layer is formed in the opening 4 of the outer peripheral wall 2 so as to be continuous with the outer wall material 3. That is, 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 refers to a gap formed between various members such as a structural member, a connecting member, a heat insulating material and connected to the indoor space, and various members themselves such as a structural member. And a hole connected to the indoor space. As shown in FIG. 2, in this example, the holes 16 formed in the beam 5 that can be used for wiring, piping, and the like, and the holes 17 for fastening members such as bolts and the like are located in the “gap communicating with the indoor space”. Equivalent to. The holes 16 and 17 are covered with the moisture-permeable waterproof sheet 13 from the outdoor side, and connected directly or indirectly to the outer wall material 3 in a state of ensuring airtightness, thereby forming an airtight layer continuous with the outer peripheral wall 2. I have. Further, for example, even when 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 are formed through the moisture-permeable waterproof sheet. By covering with airtightness 13, airtightness is ensured.

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, for example, the standards described in JIS A6111. Specifically, the moisture-permeable waterproof sheet 13 preferably has a moisture-permeation resistance of 0.19 (m ² · s · Pa) / μg or less measured according to JIS A1324 (cup method). According to such a configuration, since it has sufficient moisture permeability while ensuring airtightness, it is possible to appropriately discharge moisture from the indoor side of the airtight layer to the outside. Further, the moisture-permeable waterproof sheet 13 preferably has a waterproofness (water pressure) of 10 kPa or more measured by a hydrostatic 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 belt shape. As shown in FIGS. 1 to 3, the upper end 13 a of the moisture-permeable waterproof sheet 13 is connected to the upper part of the outdoor surface of the web 5 a of the beam 5. The moisture-permeable waterproof sheet 13 can be connected to other members such as the beam 5 in a state where airtightness is secured, for example, by an airtight tape having airtightness. The airtight tape may be a single-sided adhesive type having an adhesive layer only on one side or a double-sided adhesive type having an adhesive layer on both sides. Specifically, the airtight tape includes a 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 a plurality of types of airtight tapes can be used. .

  In this example, a double-sided adhesive-type airtight tape is arranged 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 is adhered to each other. The wet waterproof sheet 13 and the beam 5 are connected in a state where airtightness is secured. In addition, it is also possible to connect the moisture-permeable waterproof sheet 13 and the beam 5 in a state where airtightness is secured by using a single-sided adhesive type airtight tape.

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

  As shown in FIG. 2, the lower end 13b of the moisture-permeable waterproof sheet 13 is attached to the upper surface 14a of the hermetic base material 14 and the upper surface 10a of the support member 10 with a double-sided adhesive type airtight tape. 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 hermetic base material 14 to ensure airtightness. As described above, in the present embodiment, the lower end portion 13b of the moisture-permeable waterproof sheet 13 is connected to the outer wall material 3b via the airtight base material 14 and the support member 10 in a state where airtightness is ensured.

  In the present example, the airtight base material 14 not only closes the gap between the support member 10 and the upper end surface of the outer wall material 3b to ensure airtightness, but also ensures the airtightness, and the upper end surface of the outer wall material 3b and the upper surface of the support member 10. Since the step formed between the moisture-permeable waterproof sheet 13 and the lower wall 10b can be eliminated, the lower end 13b of the moisture-permeable waterproof sheet 13 can be easily connected to the outer wall material 3b.

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

  The airtight base material 18 may be a plastic foam having airtightness, such as foamed polyethylene. At the connecting portion between the two orthogonal beams 5 and 15, there is formed a concavo-convex portion caused by a fastening member such as a bolt 7 and a gap (gap communicating with an indoor space) generated between the members. Such uneven portions and gaps are covered with a rectangular parallelepiped or a block-shaped hermetic base material 18 having an L-shape in plan view, and a flat surface (side surface) of the moisture-permeable waterproof sheet 13 is provided on the flat surface (side surface) of the hermetic base material 18. By connecting the side end portions 13c, the airtightness of the connection portions of the beams 5, 15 can be ensured. Further, by forming the side surface of the airtight base material 18 with a flat surface as shown in the illustrated example, the side end 13c of the moisture-permeable waterproof sheet 13 can be easily connected. In addition, by using the airtight base material 18, the connection can be easily made with a simple shape such as a rectangle without processing the moisture permeable waterproof sheet 13 into a complicated shape.

  As shown in FIG. 3, a single-sided adhesive type airtight tape 19 is attached so as to cover the connection between the side end 13 c of the moisture-permeable waterproof sheet 13 and the airtight base material 18, so that the airtight tape 19 can be easily made transparent. The wet waterproof sheet 13 can be connected to the airtight base material 18 in a state where airtightness is ensured. As shown in FIG. 3, the moisture-permeable waterproof sheet 13 can be similarly connected to the beam 15 side orthogonal to the beam 5, and the airtightness can be more effectively improved.

  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 the present embodiment, a continuous airtight layer can be formed along the surface of the outer peripheral wall 2 of the building 100. In addition, by improving the airtightness of the building 100, it is possible to prevent a decrease in the heat insulating property due to the air leakage, and thus it is possible to improve the heat insulating property of the building 100.

  Here, in the case where the airtight layer is formed only inside the heat insulating layer as in the related art, there is a possibility that the continuity of the airtight layer may be impaired by drilling work for wiring and piping performed after the heat insulating and airtight work. By forming a continuous hermetic layer along the surface of the outer peripheral wall 2 as in the hermetic structure 1 of the embodiment, such a problem can be solved, and the hermetic layer can be reliably maintained in a continuous state. Furthermore, by providing the airtight layer reliably, it is possible to suppress the release of warm air from the gap, to reduce heat loss, and to facilitate planned ventilation.

  Moreover, since the moisture-permeable waterproof sheet 13 constituting a part of the airtight layer is flexible and has excellent followability, it can easily follow a member having a complicated shape such as a steel material having fine irregularities. Can be connected. Therefore, a gap is hardly formed at the connection portion between the moisture-permeable waterproof sheet 13 and another member, 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 from the indoor space side to the outside and to prevent dew condensation on the indoor side of the outer wall material 3 while suppressing intrusion of rainwater and the like from the outside. it can.

  In this example, the 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. With such a configuration, the airtight layer is less likely to interfere with a structural member such as a steel material than in the case where an airtight layer is formed on the indoor side of the heat insulating layer, so that the configuration of the airtight layer is less likely to be complicated, Construction is easy. Therefore, the airtightness of the building 100 can be efficiently increased. Further, 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 surface of the heat insulating layer as in this example. Layers (other airtight layers). As a result, the airtightness of the building 100 can be more effectively improved, and the heat insulating property is also improved.

  In this example, the upper end 13 a of the moisture-permeable waterproof sheet 13 is connected to the surface of the web 5 a of the beam 5. With such a configuration, the moisture-permeable waterproof sheet 13 does not easily fall off. In other words, the surface of the beam 5 is a smooth flat surface with a small number of small irregularities. It becomes difficult. From such a viewpoint, it is preferable that at least a part of the moisture-permeable waterproof sheet 13 is connected (sticked) to a frame such as the beam 5. In addition, in order to support the weight of the moisture-permeable waterproof sheet 13, it is particularly preferable that the upper end portion 13 a of the moisture-permeable waterproof sheet 13 is attached to a frame such as the beam 5.

  Further, 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, it is compared with a case where the upper end portion 13a is connected to a horizontally extending surface such as the lower surface of the upper flange 5b. Then, the durable waterproof sheet 13 has high durability when its own weight acts on the connecting portion (adhering portion) in the vertical direction, and the moisture-permeable waterproof sheet 13 is harder to peel off. Therefore, it is preferable that the upper end portion 13a of the moisture-permeable waterproof sheet 13 is attached to a surface extending in the vertical direction.

  The airtight structure and the building according to the present invention are not limited to the configuration of the above-described embodiment, but can be realized by various configurations without departing from the contents described in the claims. is there. For example, in the present embodiment, the opening 4 of the outer peripheral wall 2 is formed with the moisture-permeable waterproof sheet 13 and other members having airtightness (the beam 5, the connecting members 6, 9, the supporting member 10, the filling member 12, the sealing base material, Although the airtightness is ensured by closing with the use of 14), the present invention is not limited to this, and the opening 4 may be arranged to be closed with only the moisture-permeable waterproof sheet 13.

  In this 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. However, the present invention is not limited to this, and the connection points on each side of the moisture-permeable waterproof sheet 13 can be appropriately changed. In addition, the shape of the moisture-permeable waterproof sheet 13 can be appropriately changed, and for example, the opening 4 of the outer peripheral wall 2 may have a shape corresponding to the shape of the holes 16 and 17 forming a 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 a 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 closing the remaining portion with another airtight member such as an airtight tape.

1: airtight structure 2: outer peripheral wall 3, 3a, 3b: outer wall material 4: opening 5: beam (body)
5a: Web 5b: Upper flange 5c: Lower flange 6: Connection member 7: Bolt (fastening member)
8: Nut (fastening member)
9: Connecting 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 end 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 (9)

An airtight structure of a building in which a ventilation layer communicating with the outside of the building is not provided between an outer wall material forming an outer peripheral wall and a skeleton supporting the outer wall material,
The outer peripheral wall is formed of an outer wall material, and has an opening in which the outer wall material is partially discontinuous,
In the opening, a moisture-permeable waterproof sheet disposed so as to cover a gap communicating with the indoor space is directly or indirectly connected to the outer wall material in a state of ensuring airtightness, whereby the outer wall is An airtight structure, wherein an airtight layer including a material and the moisture-permeable waterproof sheet is formed.   The airtight structure according to claim 1, wherein the airtight layer is formed on an outdoor side of a heat insulating layer arranged along a surface of the outer peripheral wall on an indoor side.   The airtight structure according to claim 2, wherein another airtight layer is formed along a surface of the heat insulating layer on the indoor side.   The airtight structure according to any one of claims 1 to 3, wherein at least a part of the moisture-permeable waterproof sheet is connected to the frame, and the frame forms a part of the airtight layer.   The airtight structure according to any one of claims 1 to 4, wherein the moisture permeable waterproof sheet is connected to a surface of an airtight base material arranged so as to cover an uneven portion of the skeleton.   The airtight structure according to any one of claims 1 to 5, wherein the moisture permeable waterproof sheet is attached to another member with an airtight tape having airtightness.   The airtight structure according to claim 6, wherein at least one side of the moisture-permeable waterproof sheet is attached to a surface of a steel material forming the skeleton.   The airtight structure according to any one of claims 1 to 7, wherein the outer wall material is made of any of lightweight cellular concrete, PC concrete, and an extruded cement board.   A building comprising the airtight structure according to any one of claims 1 to 8.

Images