Method for constructing airtight layer

Abstract

This method for constructing an airtight layer comprises: preparing a surface material construction (SC) including a floor base material (4) having a lower surface (4a) and an airtight member (5) having an inner surface (5a) disposed so as to abut the lower surface (4a); applying a liquid adhesive agent for forming an airtight layer (9) over the lower surface (4a) and the inner surface (5a) at least at a corner portion (C1) where the lower surface (4a) and the inner surface (5a) intersect; and bonding, to the lower surface (4a) and / or the inner surface (5a) by means of the liquid adhesive agent, an airtight auxiliary tool (6) to be attached to the surface material construction (SC).

Description

Method for constructing an airtight layer

[0001] The present invention relates to a method for constructing an airtight layer in a building.

[0002] In a building having two facing members that form a corner portion, an airtight layer may be formed to ensure airtightness between the two facing members. For example, in Patent Document 1 below, an emulsion such as an acrylic resin is sprayed using a spray gun at a corner portion (an inner corner portion or an outer corner portion) formed at the joining portion of various facing members such as walls, floors, and ceilings, thereby forming a seamless airtight layer (moisture-proof layer) at the corner portion.

[0003] Further, some attachment object may be attached to the above-described corner portion. For example, Patent Document 2 below discloses fixing a coupling plate for enhancing earthquake resistance at the corner portion between a wall portion and a building slab in a building. The coupling plate is fixed to the wall portion and the building slab that form the corner portion using fastening members such as screws and bolts, respectively.

[0004] Here, in order to ensure the airtightness of the corner portion with an attached coupling plate as in Patent Document 2 above, it is conceivable to form an airtight layer by the method of Patent Document 1. In this case, first, an emulsion is sprayed on the corner portion to form an airtight layer, and then the coupling plate is fixed to the corner portion using a fastening member. However, in this method, it is necessary to perform the formation of the airtight layer and the attachment of the coupling plate (attachment object) in completely separate steps, and there is room for improvement in terms of work efficiency.

[0005] Japanese Patent Application Laid-Open No. 6-185128 Japanese Patent Application Laid-Open No. 2015-190300

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to provide a construction method capable of efficiently attaching an attachment object to a corner portion of a building where an airtight layer is formed.

[0007] To solve the above problems, a method according to one aspect of the present invention is a method for constructing an airtight layer in a building, comprising: preparing a surface material structure including a first surface material having a first inner surface facing the interior side, and a second surface material being arranged to abut against the first inner surface of the first surface material and having a second inner surface facing the interior side; applying a liquid adhesive for forming an airtight layer to the first inner surface and the second inner surface at least at the corner portion where the first inner surface and the second inner surface intersect; and bonding an object to be attached to the surface material structure to at least one of the first inner surface and the second inner surface via the liquid adhesive.

[0008] This is a side cross-sectional view of a building to which a construction method according to one embodiment of the present invention is applied. This is a side view of an airtight member. This is an enlarged side cross-sectional view of a part of Figure 1. This is a perspective view showing an airtight auxiliary device by itself. This is a side cross-sectional view showing the application of liquid adhesive to the corner of a surface material structure. This is a side cross-sectional view showing the bonding of the airtight auxiliary device using the applied liquid adhesive. This is a figure equivalent to Figure 3 showing a modified example of the above embodiment.

[0009] The embodiments of the present invention will be described below with reference to the attached drawings. Note that the following embodiments are examples that embody the present invention and are not intended to limit the technical scope of the present invention.

[0010] [Building Structure] Figure 1 is a side cross-sectional view of a building 1 to which a construction method according to one embodiment of the present invention is applied. As shown in this figure, the building 1 comprises an outer perimeter beam 2, an outer wall 3, a floor base material 4, an airtight member 5, an airtight auxiliary device 6, and a ceiling structure 7.

[0011] The outer perimeter beam 2 is a structural member that extends horizontally along the outer perimeter of the building 1 and is positioned at a height corresponding to the ceiling of the lower floors. The outer perimeter beam 2 is supported on a foundation (not shown) that is driven into the ground via columns and the like, which are arranged horizontally at predetermined pitches. The outer perimeter beam 2 is made of H-shaped steel having a pair of upper and lower flanges 21 and a web 22 that connects the central parts of both flanges 21.

[0012] A flexible insulation material 23 is installed between the two flanges 21 of the outer perimeter beam 2. The insulation material 23 is made of, for example, glass wool.

[0013] The exterior wall 3 comprises an exterior wall panel 31 that constitutes the outermost perimeter of the building 1, a beam-under-insulation material 32 provided inside the exterior wall panel 31, and a flexible insulation material 33 provided between the exterior wall panel 31 and the beam-under-insulation material 32.

[0014] The upper part of the exterior wall panel 31 is fixed to the lower flange 21 of the outer perimeter beam 2 via a mounting bracket 31a. The lower part of the exterior wall panel 31 is fixed to the foundation via a similar mounting bracket (not shown).

[0015] The under-beam insulation material 32 is positioned below the outer perimeter beam 2. Specifically, the under-beam insulation material 32 is sandwiched between the lower flange 21 of the outer perimeter beam 2 and the foundation, and is fixed in a position relative to the flange 21 by a predetermined positioning member or the like. The under-beam insulation material 32 is a rigid insulation material made of, for example, foamed urethane.

[0016] The flexible insulation material 33 is positioned below the outer perimeter beam 2, along the outer surface of the under-beam insulation material 32. The flexible insulation material 33 is fixed to the lower flange 21 of the outer perimeter beam 2, spaced apart from the outer wall panel 31, in order to form a ventilation passage between it and the outer wall panel 31. The flexible insulation material 33 is made of, for example, glass wool. Note that the flexible insulation material 33 is not essential and may be omitted.

[0017] The subfloor material 4 is a structural element that constitutes the floor of the upper floor (the second floor in this embodiment), and its periphery is supported by the outer perimeter beam 2. The subfloor material 4 includes a floor surface material placed on the outer perimeter beam 2. In this embodiment, the floor surface material is made of, for example, lightweight cellular concrete such as ALC.

[0018] The ceiling structure 7 comprises a suspension bolt 71 fixed in a suspended state to the floor base material 4 or a beam (not shown), a joist support 72 extending horizontally (in the direction perpendicular to the plane of the paper in Figure 1) and fixed to the lower end of the suspension bolt 71, a joist 73 extending in a direction perpendicular to the joist support 72 (in the left-right direction in Figure 1) and fixed to the joist support 72, and a ceiling panel 74 fixed to the lower surface of the joist 73. The ceiling panel 74 is a board material that constitutes the ceiling surface of the lower floor (the first floor in this embodiment), and is arranged to extend horizontally at a height below the outer perimeter beam 2.

[0019] The airtight member 5 is a member for ensuring airtightness between the exterior wall 3 and the floor underlayment 4, and is located on the interior side of the outer perimeter beam 2. The airtight member 5 comprises a panel-shaped beam-transverse thermal material 51 that is sandwiched between the lower surface 4a of the floor underlayment 4 and the upper surface 32a of the beam-underlayment insulation material 32, and an airtight sheet 52 that covers the beam-transverse thermal material 51. The beam-transverse thermal material 51 is a rigid insulation material made of, for example, foamed urethane. The airtight sheet 52 is a flexible sheet made of a thermoplastic resin such as polyethylene, polypropylene, or polyvinyl chloride.

[0020] Figure 2 is a side view of the airtight member 5. As shown in this figure, the beam transverse thermal member 51 has an upper surface 51a facing the lower surface 4a of the floor underlayment 4, an inner surface 51b perpendicular to the upper surface 51a and facing the interior side, and an outer surface 51c facing the opposite side of the inner surface 51b.

[0021] The airtight sheet 52 has a clamped portion 52a that is sandwiched between the lower surface 4a of the floor base material 4 and the upper surface 51a of the beam transverse heat material 51, an extended portion 52b that covers the inner surface 51b of the beam transverse heat material 51 and extends to the lower part of the beam transverse heat material 51, and a fixed portion 52c that covers a part of the upper side of the outer surface 51c of the beam transverse heat material 51 and is fixed to the outer surface 51c.

[0022] Furthermore, as shown in Figure 1, the extension portion 52b has a vertical length that can cover the entire vertical surface 51b of the beam transverse thermal material 51 and the entire vertical surface 32b of the beam under-insulation material 32. This prevents humid indoor air from entering the beam transverse thermal material 51 and beam under-insulation material 32 when the indoor temperature is higher than the outdoor temperature, such as in winter.

[0023] Figure 3 is an enlarged side cross-sectional view of a portion of Figure 1. As shown in this figure, a corner portion C1 is formed at the junction of the floor underlayment 4 and the airtight member 5. The corner portion C1 is an inner corner formed by the horizontal lower surface 4a of the floor underlayment 4 and the vertical inner surface 5a of the airtight member 5. That is, the surface material structure SC having a corner portion C1 (inner corner) is constructed by the floor underlayment 4 having a lower surface 4a facing the interior, and the airtight member 5 being positioned to abut against the lower surface 4a and having an inner surface 5a facing the interior. In this case, the floor underlayment 4 corresponds to an example of the "first surface material" of the present invention, and the lower surface 4a of the floor underlayment 4 corresponds to an example of the "first inner surface" of the present invention. Furthermore, the airtight member 5 corresponds to an example of the "second surface material" of the present invention, and the inner surface 5a of the airtight member 5 corresponds to an example of the "second inner surface" of the present invention.

[0024] An airtight layer 9 is formed at the corner C1 of the surface material structure SC. The airtight layer 9 is formed by the natural curing of liquid adhesive 100 (Figure 5) and has a horizontal portion 91 formed on the lower surface 4a of the floor base material 4 and a vertical portion 92 formed on the inner surface 5a of the airtight member 5. The inner surface 5a of the airtight member 5 is equivalent to the surface of the extended portion 52b of the airtight sheet 52 that covers the inner surface 51b of the beam transverse heat material 51.

[0025] The horizontal portion 91 and the vertical portion 92 of the airtight layer 9 are continuous at the intersection X1 of the surface material structure SC, that is, at the intersection X1 where the lower surface 4a of the floor base material 4 and the inner surface 5a of the airtight member 5 intersect (are perpendicular). As a result, the intersection X1 is sealed by the airtight layer 9, preventing air from flowing through the gap between the floor base material 4 and the airtight member 5. In other words, the airtight layer 9 has the function of airtightly sealing the space between the floor base material 4 and the airtight member 5.

[0026] The airtight sealing aid 6 functions as a fall prevention device to prevent the airtight member 5 (beam-transverse heat material 51) from falling inward, and is attached to the corner portion C1. Figure 4 is a perspective view showing the airtight sealing aid 6 by itself. As shown in Figures 3 and 4, the airtight sealing aid 6 has a base portion 61 fixed to the lower surface 4a of the floor base material 4 via the horizontal portion 91 of the airtight layer 9, and an extension portion 62 that extends diagonally downward toward the airtight member 5 from the inner end 61b, which is the end of the base portion 61 opposite to the airtight member 5 (indoor side). The width dimension W of the airtight sealing aid 6 shown in Figure 4, in other words, the dimension of the airtight sealing aid 6 in the direction perpendicular to the plane of the paper in Figure 3, is smaller than the dimension of the airtight member 5 in the same direction. The airtight sealing aid 6 is an example of an "object to be attached" in the present invention.

[0027] As shown in Figure 3, the outer end 61a of the base portion 61, which is the end closest to the airtight member 5, is located near the intersection X1 between the lower surface 4a of the floor underlayment 4 and the inner surface 5a of the airtight member 5. However, the outer end 61a of the base portion 61 is not in contact with the intersection X1, but is spaced at a distance L1 from the intersection X1.

[0028] The lower end 62a of the extension portion 62 is located near the inner surface 5a of the airtight member 5. The position of the lower end 62a of the extension portion 62 in a direction perpendicular to the inner surface 5a is approximately the same as the position of the outer end 61a of the base portion 61 in the same direction. The positions of the two may be exactly the same, but in this embodiment, the extension portion 62 is formed such that the lower end 62a of the extension portion 62 is closer to the inner surface 5a of the airtight member 5 than the outer end 61a of the base portion 61. That is, the lower end 62a of the extension portion 62 extends outward to a position beyond the reference line RL that hangs down from the outer end 61a of the base portion 61. Note that in Figures 1 and 3, the lower end 62a of the extension portion 62 is located slightly away from the inner surface 5a of the airtight member 5, but the lower end 62a may be in contact with the inner surface 5a.

[0029] Here, multiple airtight members 5 can be arranged on the inside of the outer perimeter beam 2 so as to be aligned horizontally (in the direction perpendicular to the plane of the paper in Figures 1 and 3). In this case, multiple airtight auxiliary devices 6 are attached to the corner C1 so as to be aligned horizontally at appropriate intervals so as to be able to prevent all airtight members 5 from tilting. Preferably, the airtight auxiliary devices 6 are attached so as to be located at the boundary between adjacent airtight members 5 (beam transverse heat members 51). In this way, one airtight auxiliary device 6 can prevent two beam transverse heat members 51 from tilting.

[0030] [Construction Method for the Airtight Layer] Next, the construction method for the airtight layer 9 (Figure 3) in building 1 having the structure described above will be explained using Figures 5 and 6.

[0031] First, as shown in Figure 5, the basic structure of building 1 is prepared. The basic structure includes the outer perimeter beams 2, the outer wall 3 (Figure 1), the floor underlayment 4, and the airtight member 5. Of these, the floor underlayment 4 and the airtight member 5 constitute the surface structure SC having a corner section C1.

[0032] Next, the liquid adhesive 100 is sprayed onto the corner C1 using the spray gun 101. The liquid adhesive 100 is, for example, an uncured paint that has fluidity and tackiness, and is sprayed in a mist from the spray gun 101. This spraying process continuously applies the liquid adhesive 100 to the lower surface 4a of the floor base material 4 and the inner surface 5a of the airtight member 5.

[0033] As described above, the liquid adhesive 100 applied to the corner portion C1 forms a first adhesive film 100a along the lower surface 4a of the floor base material 4 and a second adhesive film 100b along the inner surface 5a of the airtight member 5, as shown in Figure 6.

[0034] Next, while the liquid adhesive 100 is still uncured, the airtight sealing aid 6 is attached to the corner portion C1 using the first adhesive film 100a. That is, the airtight sealing aid 6 is attached to the corner portion C1 by bonding the base portion 61 of the airtight sealing aid 6 to the lower surface 4a of the floor subfloor material 4 via the first adhesive film 100a. At this time, the bonding position of the base portion 61 is adjusted so that the outer end 61a of the base portion 61 is slightly away from the intersection X1 between the lower surface 4a of the floor subfloor material 4 and the inner surface 5a of the airtight member 5.

[0035] Subsequently, the liquid adhesive 100 hardens over time. Specifically, the first adhesive film 100a formed on the lower surface 4a of the floor base material 4 and the second adhesive film 100b formed on the inner surface 5a of the airtight member 5 harden. The hardened adhesive films 100a and 100b form an L-shaped airtight layer 9 (Figure 3) that continuously covers the lower surface 4a of the floor base material 4 and the inner surface 5a of the airtight member 5. That is, the hardened first adhesive film 100a forms the horizontal portion 91 of the airtight layer 9, and the hardened second adhesive film 100b forms the vertical portion 92 of the airtight layer 9. As a result, the intersection X1 is sealed by the airtight layer 9, and the space between the floor base material 4 and the airtight member 5 is airtightly sealed.

[0036] Furthermore, as the liquid adhesive 100 hardens, the base portion 61 of the airtight seal aid 6 is fixed to the floor subfloor material 4. That is, the hardened first adhesive film 100a (i.e., the horizontal portion 91 of the airtight layer 9) fixes the base portion 61 to the floor subfloor material 4. This completes the attachment of the airtight seal aid 6 to the corner portion C1. As shown in Figure 3, the attached airtight seal aid 6 is positioned so that the outer end 61a of its base portion 61 is separated from the intersection X1 by a distance L1.

[0037] [Effects] As described above, in this embodiment, in order to form an airtight layer 9 at the corner portion C1 of the surface material structure SC including the subfloor material 4 and the airtight member 5, liquid adhesive 100 is applied across the lower surface 4a of the subfloor material 4 and the inner surface 5a of the airtight member 5. In addition, an airtight auxiliary device 6 for restricting the tilting of the airtight member 5 is bonded to the subfloor material 4 via the liquid adhesive 100 (first adhesive film 100a) applied to the lower surface 4a of the subfloor material 4. This method has the advantage that the airtight auxiliary device 6 can be efficiently attached to the corner portion C1 of the building 1 where the airtight layer 9 is formed.

[0038] In other words, in this embodiment, liquid adhesive 100 is applied to the corner portion C1 of the surface material structure SC so as to cover both the lower surface 4a and the inner surface 5a, which are the forming surfaces of the corner portion C1. As the liquid adhesive 100 hardens, an airtight layer 9 can be formed that airtightly seals the space between the floor base material 4 and the airtight member 5. Moreover, since the airtight auxiliary device 6 is bonded to the lower surface 4a of the floor base material 4 using the liquid adhesive 100 applied to form the airtight layer 9, the bonding of the airtight auxiliary device 6 can be carried out quickly immediately following the application of the liquid adhesive 100, and it becomes unnecessary to prepare dedicated fasteners (such as screws or bolts) for fixing the airtight auxiliary device 6. This makes it possible to efficiently attach the airtight auxiliary device 6 to the corner portion C where the airtight layer 9 is formed.

[0039] Furthermore, in this embodiment, the airtight sealing aid 6 is bonded to the corner portion C1 while being spaced apart from the intersection X1 between the lower surface 4a of the floor base material 4 and the inner surface 5a of the airtight member 5.

[0040] In other words, in order to ensure airtightness between the floor base material 4 and the airtight member 5, it is important to apply the required amount of liquid adhesive 100 to the intersection X1 between the lower surface 4a of the floor base material 4 and the inner surface 5a of the airtight member 5, thereby ensuring that the intersection X1 is reliably covered with the airtight layer 9. In this embodiment, since the airtightness aid 6 is bonded at a distance from the intersection X1, which is important for ensuring airtightness, the amount of liquid adhesive 100 applied to the intersection X1 can be maintained, and the airtightness aid 6 can be attached to the corner C1 while ensuring good airtightness.

[0041] Furthermore, in this embodiment, the liquid adhesive 100 is applied (sprayed) to the high corner section C1 formed by the floor base material 4 and the airtight member 5 using a spray gun 101. Therefore, even though the work is performed at a height, the application of the liquid adhesive 100 can be easily carried out, and the airtight layer 9 can be easily constructed.

[0042] Further, in the present embodiment, since the airtight auxiliary tool 6 is attached to the corner portion C1 so as to regulate the fall of the airtight member 5, the airtight member 5 can be positioned at a desired position while simplifying the attachment of the airtight member 5.

[0043] That is, in the present embodiment, the airtight member 5 is attached by a simple method of fitting adjacent to the floor base material 4. Even in such a case, according to the present embodiment in which the airtight auxiliary tool 6 is attached to the corner portion C1 as a fall stopper for regulating the fall (movement) of the airtight member 5, the airtight member 5 can be positioned at a desired position along the inner surface of the outer peripheral beam 2, and the attachment position of the airtight member 5 can be stabilized.

[0044] Further, in the present embodiment, the airtight auxiliary tool 6 includes a base portion 61 adhered to the lower surface 4a of the floor base material 4 in a state separated from the intersection X1 of the lower surface 4a and the inner surface 5a, and an extension portion 62 extending obliquely downward from the inner end 61b, which is the end portion on the opposite side of the base portion 61 from the airtight member 5, toward the airtight member 5. Thereby, while separating the base portion 61 of the airtight auxiliary tool 6 from the intersection X1, the fall of the airtight member 5 can be appropriately regulated by the extension portion 62 extending obliquely downward from the base portion 61.

[0045] In particular, in the present embodiment, since the lower end 62a of the extension portion 62 extends to a position closer to the inner surface 5a of the airtight member 5 than the outer end 61a, which is the end portion on the side of the base portion 61 closer to the airtight member 5, the fall of the airtight member 5 can be effectively regulated by the lower end 62a of the extension portion 62, and the attachment position of the airtight member 5 can be further stabilized.

[0046] [Modification Example] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and for example, the following modifications are possible.

[0047] In the above embodiment, as a stopper for preventing the airtight member 5 from falling, an airtight auxiliary tool 6 having a base portion 61 adhered to the lower surface 4a of the floor underlayment 4 and an extension portion 62 extending obliquely downward from the inner end 61b of the base portion 61 toward the airtight member 5 is used. However, the shape of the airtight auxiliary tool 6 is not limited to this. For example, an L-shaped airtight auxiliary tool 600 as shown in FIG. 7 may be used. That is, the airtight auxiliary tool 600 has a base portion 601 adhered to the lower surface 4a of the floor underlayment 4 and a hanging portion 602 extending downward from the outer end 601a which is the end portion on the side of the airtight member 5 in the base portion 601. In this case, it is preferable that the outer end 601a of the base portion 601 and the hanging portion 602 are at positions slightly separated from the inner surface 5a (or the intersection point X1) of the airtight member 5.

[0048] In the above embodiment, the liquid adhesive 100 is applied to the corner portion C1 between the floor underlayment 4 and the airtight member 5 using the spray gun 101. However, the method of applying the liquid adhesive 100 is not limited to this. For example, the liquid adhesive 100 may be applied to the corner portion C1 using a brush or the like.

[0049] In the above embodiment, the airtight layer 9 is formed at the corner portion C1 between the floor underlayment 4 and the airtight member 5. However, the object on which the airtight layer 9 is formed is not limited to this. For example, a liquid adhesive may be applied to a corner portion where two wall materials having vertical inner surfaces intersect.

[0050] In the above embodiment, the airtight auxiliary tool 6 for restricting the fall of the airtight member 5 is adhered to the corner portion C1 via the liquid adhesive 100 (airtight layer 9). However, the object (attachment object) attached to the corner portion C1 by adhesion using the liquid adhesive 100 is not limited to this. For example, an additional heat insulating material for enhancing heat insulation may be attached to the corner portion C1 as an attachment object. Alternatively, a reinforcing member for enhancing seismic resistance may be attached to the corner portion C1.

[0051] In the above embodiment, the airtight sealing aid 6, which is the object to be attached, was adhered only to the lower surface 4a of the floor base material 4, which is one of the constituent surfaces of the corner section C1. However, the object to be attached can also be adhered to the inner surface 5a of the airtight member 5, which is the other constituent surface of the corner section C1. In other words, the object to be attached only needs to be adhered to at least one of the two surfaces (first inner surface and second inner surface) that intersect each other to form the corner section, and which of the two surfaces (either one or both of the first inner surface and second inner surface) to which the object to be attached is adhered can be appropriately selected according to the shape and structure of the object to be attached.

[0052] [Summary] The embodiments and their variations described above can be summarized as follows.

[0053] A method according to a first aspect of the present invention is a method for constructing an airtight layer in a building, comprising: preparing a surface material structure including a first surface material having a first inner surface facing the interior side, and a second surface material being arranged to abut against the first inner surface of the first surface material and having a second inner surface facing the interior side; applying a liquid adhesive for forming an airtight layer to the first inner surface and the second inner surface at least at the corner portion where the first inner surface and the second inner surface intersect; and bonding an object to be attached to the surface material structure to at least one of the first inner surface and the second inner surface via the liquid adhesive.

[0054] According to the first embodiment, a liquid adhesive is applied to the surface material structure (first surface material and second surface material) that forms a corner portion where the first surface material and the second surface material intersect, so as the liquid adhesive hardens, an airtight layer can be formed that airtightly seals the space between the first surface material and the second surface material. Moreover, since the object to be attached is bonded to at least one of the first surface material and the second surface material using the liquid adhesive applied to form this airtight layer, the bonding of the object to be attached can be carried out quickly immediately after the application of the liquid adhesive, and it becomes unnecessary to prepare special fasteners (e.g., screws or bolts) for fixing the object to be attached. As a result, the object to be attached can be efficiently attached to the corner portion where the airtight layer is formed.

[0055] The method according to the second embodiment involves bonding the object to be attached in the first embodiment while the object to be attached is spaced apart from the intersection of the first inner surface and the second inner surface.

[0056] According to the second embodiment, since the object to be attached is bonded at a distance from the intersection of the first inner surface and the second inner surface, which is important for forming the airtight layer, the amount of liquid adhesive applied to the intersection can be maintained, and the object to be attached can be mounted to the corner while ensuring good airtightness.

[0057] The method according to the third embodiment involves preparing the surface material structure in the first or second embodiment, wherein the surface material structure has a first surface material arranged such that the first inner surface faces downward in order to constitute a ceiling.

[0058] According to the third embodiment, an airtight layer can be easily constructed at high corners. That is, when the first facing material constitutes a downward-facing ceiling surface, the work of forming an airtight layer between the first facing material and the second facing material is performed at a height. However, since the airtight layer can be formed by applying the liquid adhesive described above, the airtight layer can be constructed relatively easily even when working at a height.

[0059] The method relating to the fourth aspect involves bonding the object to be attached to the first inner surface in order to restrict the movement of the second surface material toward the interior side, in the bonding of the object to be attached in any of the first to third aspects.

[0060] According to the fourth embodiment, the installation of the second panel can be simplified while positioning the second panel at a desired location. For example, the second panel may be installed by a simple method such as fitting it adjacent to the first panel. Even in such cases, since the object to be installed is bonded to the second panel as a member to restrict the movement of the second panel, the second panel can be positioned at a desired location and its installation position can be stabilized.

Claims

1. A method for constructing an airtight layer in a building, comprising: preparing a panel structure including a first panel having a first inner surface facing the interior side, and a second panel having a second inner surface facing the interior side and positioned to abut against the first inner surface of the first panel; applying a liquid adhesive for forming an airtight layer to the first inner surface and the second inner surface at least at the corner where the first inner surface and the second inner surface intersect; and bonding an object to be attached to the panel structure to at least one of the first inner surface and the second inner surface via the liquid adhesive.

2. The method for constructing an airtight layer according to claim 1, wherein, in bonding the object to be attached, the object to be attached is bonded while it is spaced apart from the intersection of the first inner surface and the second inner surface.

3. The method for constructing an airtight layer according to claim 1 or 2, wherein in the preparation of the surface material structure, the surface material structure is prepared having a first surface material arranged such that the first inner surface faces downward in order to constitute a ceiling.

4. The method for constructing an airtight layer according to any one of claims 1 to 3, wherein, in bonding the object to be attached, the object to be attached is bonded to the first inner surface to restrict the movement of the second surface material toward the interior side.

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