Exterior wall structure of building

Abstract

To provide an exterior wall structure of a building that is capable of preventing peeling off of exterior materials over a long period of time.SOLUTION: An exterior wall structure 1 of a building is provided. The exterior wall structure 1 comprises: a first exterior wall panel P1; a second exterior wall panel P2 arranged horizontally adjacently to the first exterior wall panel P1 via a sealant 20 extending in a vertical direction; a plurality of exterior materials 3 fixed to a side of outer surfaces 2o facing a building outside of each of the first exterior wall panel P1, the second exterior wall panel P2 and the sealant 20 via an adhesive layer 21 made of a hardened product of a first adhesive 21A; and a barrier layer 4 arranged between the first exterior wall panel P1 and the adhesive layer 21 and between the second exterior wall panel P2 and the adhesive layer 21, and having water impermeability. The barrier layer 4 is disposed in side regions 25, 25 at the sealant 20 side of each of the first exterior wall panel P1 and the second exterior wall panel P2. The maximum thickness W1 of the barrier layer 4 is 30% or less of the maximum thickness W2 of the adhesive layer 21.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an exterior wall structure of a building. [Background technology]

[0002] The following Patent Document 1 describes a wall structure. This wall structure includes a wall base in which multiple wall base materials are arranged with joints between them, a base tape arranged along the joints with a width spanning the joints, an adhesive layer made of a cured product of an elastic adhesive arranged on the surface of the wall base so as to cover the base tape, and multiple exterior materials fixed to the adhesive layer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-167767 A Summary of the Invention [Problem to be solved by the invention]

[0004] In general, in the wall structure described above, cracks in the exterior material or cracks in the adhesive layer tend to occur on the joint side where interlayer deformation behavior increases due to shaking such as earthquakes. In particular, the adhesive layer covering the base tape is thinned by the above-mentioned base tape, so that cracks in the adhesive layer tend to occur in that area. When such cracks in the exterior material or cracks in the adhesive layer occur, there is a problem that moisture penetrates into the wall base material, causing the exterior material to peel off.

[0005] The present invention has been devised in consideration of the above-mentioned circumstances, and has as its main object to provide an exterior wall structure of a building that is capable of suppressing peeling off of exterior materials over the long term. [Means for solving the problem]

[0006] The present invention is an exterior wall structure of a building, comprising: a first exterior wall panel; a second exterior wall panel arranged horizontally adjacent to the first exterior wall panel via a sealant extending in the vertical direction; a plurality of exterior materials fixed to the outer surfaces of the first exterior wall panel, the second exterior wall panel, and the sealant facing the outside of the building via an adhesive layer made of a cured product of a first adhesive; and a water-impermeable barrier layer arranged between the first exterior wall panel and the adhesive layer and between the second exterior wall panel and the adhesive layer, wherein the barrier layer is arranged in a side region on the sealant side of each of the first exterior wall panel and the second exterior wall panel, and the maximum thickness of the barrier layer is 30% or less of the maximum thickness of the adhesive layer. Effect of the Invention

[0007] By adopting the above-mentioned configuration, the exterior wall structure of a building of the present invention can suppress peeling of exterior materials and the like for a long period of time. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a cross-sectional view showing the exterior wall structure of the building of the present embodiment. [Diagram 2] 2 is a perspective view showing a first exterior wall panel, a second exterior wall panel, and multiple exterior materials. FIG. [Diagram 3] 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 4] FIG. 2 is an exploded perspective view of a first exterior wall panel and a second exterior wall panel. [Diagram 5] 1 is a front view showing a wall base material of a first exterior wall panel and a wall base material of a second exterior wall panel. FIG. [Figure 6] FIG. 11 is a front view showing a wall base material of a first exterior wall panel, a wall base material of a second exterior wall panel, and a wall base material of a third exterior wall panel according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. It should be understood that the drawings include exaggerated expressions and expressions different from the dimensional ratio of the actual structure in order to help understand the contents of the invention. Furthermore, the same or common elements are given the same reference numerals throughout the embodiments, and duplicated explanations are omitted. Furthermore, the specific configurations shown in the embodiments and drawings are for understanding the contents of the present invention, and the present invention is not limited to the specific configurations shown in the drawings.

[0010] [Building exterior wall structure (first embodiment)] Fig. 1 is a cross-sectional view showing an exterior wall structure 1 of a building B of this embodiment. Fig. 2 is a perspective view showing a first exterior wall panel P1, a second exterior wall panel P2, and multiple exterior materials 3. Fig. 3 is a cross-sectional view taken along line AA in Fig. 2. In this embodiment, the positions of each component of the exterior wall structure 1 are specified on an orthogonal coordinate system consisting of the x-axis, y-axis, and z-axis. In this embodiment, the x-axis direction is set to the horizontal direction, the y-axis direction to the up-down direction, and the z-axis direction to the wall thickness direction.

[0011] In this embodiment, the building B is illustrated as a house, but may be a building, etc. The exterior wall structure 1 of this embodiment is configured to include a first exterior wall panel P1, a second exterior wall panel P2, a plurality of exterior materials 3, and a barrier layer 4 (shown in FIG. 3). In addition to the first exterior wall panel P1 and the second exterior wall panel P2, the exterior wall structure 1 may further include, for example, a third exterior wall panel (not shown).

[0012] As shown in Fig. 1, the exterior wall structure 1 may further include an interior material 5. The first exterior wall panel P1, the second exterior wall panel P2, the multiple exterior materials 3, the barrier layer 4 (shown in Fig. 3), and the interior material 5 are fixed to a frame structure F including, for example, columns, beams, etc.

[0013] [First exterior wall panel] As shown in Fig. 2, the first exterior wall panel P1 is configured to include a frame 7 and a wall base material 8. The frame 7 and the wall base material 8 are preferably fixed together, for example, in a factory. This makes it possible to shorten the construction period of the building B and stabilize the quality.

[0014] The first exterior wall panel P1 of this embodiment has an opening 9. For example, a window glass or a door is attached to this opening 9. The opening 9 may be omitted from the first exterior wall panel P1 depending on the layout of the building B. The opening 9 of this embodiment is formed as a waist window (waist-high window), but may also be a bay window (sliding window) or the like. In this embodiment, the opening 9 is provided adjacent to the sealing material 20.

[0015] [Frame border] The frame 7 is made of metal. Such a frame 7 has higher rigidity than, for example, a frame (not shown) made of wood, and therefore improves the durability of the first exterior wall panel P1. The metal constituting the frame 7 may be, for example, steel.

[0016] FIG. 4 is an exploded perspective view of the first exterior wall panel P1 and the second exterior wall panel P2. As shown in FIG. 4, the frame 7 is formed in a rectangular shape when viewed from the front. The first insulating material 10 shown in FIG. 1 is arranged in the space surrounded by the frame 7. The first insulating material 10 can be made of an insulating material including, for example, a fiber-based insulating material (rock wool, glass wool, etc.) or a resin-based insulating material (polystyrene foam, urethane foam, phenol foam, etc.). This first insulating material 10 is preferably arranged inside the frame 7, for example, in a factory. In addition, a moisture-permeable waterproof sheet (not shown) may be arranged on the outer surface of the first insulating material 10.

[0017] 4, the frame 7 of this embodiment includes vertical frame members 11, horizontal frame members 14, and reinforcing frame members 16. Note that the frame 7 is not limited to this embodiment, and for example, the reinforcing frame members 16 may be omitted depending on the rigidity, durability, and the like required of the frame 7. The vertical frame members 11, horizontal frame members 14, and reinforcing frame members 16 are joined together by, for example, welding or the like.

[0018] In this embodiment, the vertical frame member 11, the horizontal frame member 14, and the reinforcing frame member 16 are configured to include a pair of flanges 15a, 15a and a web 15b connecting the pair of flanges 15a, 15a. The pair of flanges 15a, 15a and the web 15b form the vertical frame member 11, the horizontal frame member 14, and the reinforcing frame member 16 into a U-shaped cross section having a recess 15r.

[0019] The vertical frame members 11 extend in the up-down direction (y-axis direction) and are arranged on the outer portions 7s of the frame 7. In this embodiment, the vertical frame members 11 are arranged on both sides of the frame 7 in the horizontal direction (i.e., on both outer portions 7s in the x-axis direction).

[0020] The horizontal frame members 14 extend horizontally (in the x-axis direction). The horizontal frame members 14 in this embodiment include outer horizontal frame members 14A, 14A, an upper horizontal frame member 14B, and a lower horizontal frame member 14C.

[0021] The outer horizontal frame members 14A, 14A are disposed on both sides of the frame 7 in the up-down direction (y-axis direction). These outer horizontal frame members 14A, 14A are joined to the upper and lower ends of the vertical frame members 11, 11 to form the frame 7 that is rectangular in front view. In this embodiment, the upper horizontal frame member 14B defines the upper edge 9u of the opening 9. Meanwhile, the lower horizontal frame member 14C defines the lower edge 9d of the opening 9.

[0022] The reinforcing frame 16 of this embodiment includes an upper reinforcing frame 16A and a lower reinforcing frame 16B. The upper reinforcing frame 16A extends in the vertical direction (y-axis direction) between the outer horizontal frame 14A and the upper horizontal frame 14B. The lower reinforcing frame 16B extends in the vertical direction (y-axis direction) between the outer horizontal frame 14A and the lower horizontal frame 14C.

[0023] [Wall underlayment] Fig. 5 is a front view showing the wall base material 8 of the first exterior wall panel P1 and the wall base material 8 of the second exterior wall panel P2. As shown in Figs. 1, 2 and 4, the wall base material 8 is fixed to the building outer side S1 of the frame 7. As shown in Figs. 4 and 5, the wall base material 8 of this embodiment is formed in a rectangular plate shape when viewed from the front. In addition, as shown in Figs. 1 and 4, the wall base material 8 is fixed to the frame 7 via furring strips 17. As a result, an air layer 18 can be formed between the wall base material 8 and the frame 7 (first insulating material 10) as shown in Fig. 1.

[0024] As shown in Fig. 4 and Fig. 5, the first exterior wall panel P1 of this embodiment is composed of one wall base material 8, but is not limited to this embodiment. The first exterior wall panel P1 may be composed of multiple wall base materials 8 (not shown) arranged in the horizontal direction (x-axis direction), for example. The wall base material 8 may be formed as a ceramic cement board or a foamed concrete panel such as ALC.

[0025] [Second exterior wall panel] As shown in Figures 2 to 5, the second exterior wall panel P2 is disposed adjacent to the first exterior wall panel P1 in the horizontal direction (x-axis direction) via a sealant 20 extending in the up-down direction (y-axis direction). As shown in Figures 2 and 4, the second exterior wall panel P2 of this embodiment is configured to include a frame 7 and a wall base material 8, similar to the first exterior wall panel P1. The frame 7 and the wall base material 8 are preferably fixed together, for example, in a factory.

[0026] The second exterior wall panel P2 of this embodiment is different from the first exterior wall panel P1 in that it does not have an opening 9. Note that, depending on the layout of the building B, the second exterior wall panel P2 may be provided with an opening 9.

[0027] [Frame border] The frame 7 is made of metal (for example, steel) like the first exterior wall panel P1. As shown in Fig. 4, the frame 7 is formed in a rectangular shape when viewed from the front. The first insulating material 10 shown in Fig. 1 is disposed in the space surrounded by the frame 7.

[0028] 4, like the frame 7 of the first exterior wall panel P1, the frame 7 of this embodiment includes vertical frame members 11, horizontal frame members 14, and reinforcing frame members 16. Note that, depending on the rigidity, durability, and other factors required of the frame 7, for example, the reinforcing frame members 16 may be omitted.

[0029] The vertical frame members 11 extend in the up-down direction (y-axis direction) and are arranged on the outer portions 7s of the frame 7. In this embodiment, the vertical frame members 11 are arranged on both sides of the frame 7 in the horizontal direction (i.e., on both outer portions 7s in the x-axis direction).

[0030] Of the pair of vertical frame members 11, 11, one vertical frame member 11 (the vertical frame member 11 on the left side in FIG. 4) is adjacent to the vertical frame member 11 (the vertical frame member 11 on the right side in FIG. 4) of the first exterior wall panel P1. These vertical frame members 11, 11 are fixed by fixing parts 23 such as bolts.

[0031] The horizontal frame member 14 extends in the horizontal direction (x-axis direction). Unlike the first exterior wall panel P1 having the opening 9, the horizontal frame member 14 in this embodiment is composed only of outer horizontal frame members 14A, 14A. These outer horizontal frame members 14A, 14A are respectively arranged on both sides of the frame 7 in the up-down direction (y-axis direction) and are joined to the upper end sides and lower end sides of the vertical frame members 11, 11. This forms the frame 7 that is rectangular when viewed from the front.

[0032] The reinforcing frame material 16 of this embodiment extends in the up-down direction (y-axis direction) between the outer horizontal frame materials 14A, 14A, unlike the first exterior wall panel P1 having the opening 9. Such reinforcing frame material 16 can ensure the rigidity of the frame 7.

[0033] [Wall underlayment] 1, 2, and 4, the wall base material 8 is fixed to the building outer side S1 of the frame 7, similar to the first exterior wall panel P1. The wall base material 8 of this embodiment is formed in a rectangular plate shape when viewed from the front, and is fixed to the frame 7 via furring strips 17, as shown in Fig. 1 and 4. This allows an air layer 18 to be formed between the wall base material 8 and the frame 7 (first insulating material 10), as shown in Fig. 1.

[0034] 4 and 5, the second exterior wall panel P2 of the present embodiment is composed of one wall base material 8, but is not limited to this. The second exterior wall panel P2 may be composed of multiple wall base materials 8 (not shown) arranged in the horizontal direction (x-axis direction), for example.

[0035] [Sealing material] 2 to 5, the sealant 20 of this embodiment is filled in a joint (gap) 19 formed between the wall base material 8 of the first exterior wall panel P1 and the wall base material 8 of the second exterior wall panel P2, and extends in the vertical direction (y-axis direction). Such a sealant 20 makes it possible to prevent moisture such as rain from penetrating between the first exterior wall panel P1 and the second exterior wall panel P2. For example, a silicone-based, modified silicone-based, urethane-based, acrylic-based, polysulfide-based, or acrylic urethane-based sealant can be appropriately used as the sealant 20.

[0036] As shown in Figures 3 and 4, in this embodiment, the wall base material 8 of the first exterior wall panel P1 and the wall base material 8 of the second exterior wall panel P2 are arranged horizontally (in the x-axis direction) via the sealing material 20, thereby forming a single continuous outer surface 2o on the outside S1 of the building.

[0037] [Multiple exterior materials] As shown in FIG. 3, multiple exterior materials 3 are fixed via adhesive layers 21 to the outer surfaces 2o of the first exterior wall panel P1, the second exterior wall panel P2, and the sealing material 20, each of which faces the outside S1 of the building.

[0038] The adhesive layer 21 is composed of a hardened product of the first adhesive 21A. It is preferable to use an elastic adhesive for the first adhesive 21A. Such an elastic adhesive can follow the deformation of the first exterior wall panel P1 and the second exterior wall panel P2, and therefore can suppress cracks in the exterior material 3 and cracks in the adhesive layer 21. As the elastic adhesive, various types of adhesives can be used, such as modified silicone-based or urethane-based elastic adhesives. Note that the first adhesive 21A is not limited to an elastic adhesive, and may be, for example, mortar, etc.

[0039] 1 to 3, the exterior material 3 of this embodiment is a tile 12. By using such a tile 12 as the exterior material 3, the durability of the exterior wall structure 1 and the aesthetic appearance of the exterior wall surface 1s are improved. Note that the exterior material 3 is not limited to the tile 12, and may be, for example, a stone material, a ceramic plate, or the like.

[0040] As shown in Fig. 2, the tiles 12 in this embodiment are arranged in a horse-jointed pattern, but may be arranged in a hexagonal pattern, etc. As shown in Fig. 3, the bottom joints of the tiles 12 are formed of an adhesive layer 21 (cured product of the first adhesive 21A).

[0041] 2 and 3, in this embodiment, some of the tiles 12 are arranged across the sealing material 20 (joints 19). As a result, in the exterior wall structure 1, the exterior material 3 is arranged without interruption between the first exterior wall panel P1 and the second exterior wall panel P2, improving the aesthetic appearance of the exterior wall surface 1s.

[0042] [Barrier layer] In general, when shaking such as an earthquake occurs, the interlayer deformation angle of the first exterior wall panel P1 and the second exterior wall panel P2 (shown in Fig. 2) increases. In particular, the interlayer deformation behavior tends to increase on the joint 19 side (sealant 20 side) between the first exterior wall panel P1 and the second exterior wall panel P2, which makes it easy for cracks to occur in the exterior material 3 and the adhesive layer 21 (shown in Fig. 3).

[0043] Furthermore, when a base tape such as that in Patent Document 1 is provided, the thickness of the adhesive layer 21 (shown in FIG. 3) covering the base tape is reduced, and in that portion, the ability of the adhesive layer 21 to follow deformations of the first exterior wall panel P1 and the second exterior wall panel P2 is reduced. As a result, cracks are likely to occur in the adhesive layer 21.

[0044] When cracks occur in the exterior material 3 or the adhesive layer 21, moisture penetrates through the cracks into the wall base material 8. The moisture that penetrates into the wall base material 8, for example, repeatedly freezes and melts, causing deterioration of the wall base material 8 (the occurrence of so-called frost damage), and causing the exterior material 3 fixed to the wall base material 8 to peel off.

[0045] In the exterior wall structure 1 of this embodiment, a barrier layer 4 (shown in Figs. 3 to 5) is provided to suppress, for a long period of time, the peeling off of the exterior material 3. As shown in Fig. 3, the barrier layer 4 is disposed between the first exterior wall panel P1 and the adhesive layer 21, and between the second exterior wall panel P2 and the adhesive layer 21, and is water impermeable.

[0046] As shown in Fig. 3 to Fig. 5, the barrier layer 4 of this embodiment is disposed in the side regions 25, 25 on the sealant 20 side of each of the first exterior wall panel P1 and the second exterior wall panel P2. In these side regions 25, 25 (regions on the sealant 20 side), as described above, the interlayer deformation behavior tends to be large. By disposing the barrier layer 4 in each of such side regions 25, 25, even if cracks occur in the exterior material 3 or in the adhesive layer 21 and moisture penetrates through the cracks, the barrier layer 4 can block the penetration of moisture into the building inside S2. This suppresses the penetration (permeation) of moisture into each of the wall base materials 8, 8 of the first exterior wall panel P1 and the second exterior wall panel P2, and therefore can prevent the exterior material 3 from peeling off due to frost damage or the like of the wall base material 8.

[0047] 3, the maximum thickness W1 of the barrier layer 4 is set to 30% or less of the maximum thickness W2 of the adhesive layer 21. In this embodiment, the maximum thickness W2 of the adhesive layer 21 is specified between the outer surfaces 2o of the first exterior wall panel P1, the second exterior wall panel P2, and the sealant 20, and the inner surface 3i of the exterior material 3, in the adhesive layer 21.

[0048] The maximum thickness W1 of the barrier layer 4 is set to 30% or less of the maximum thickness W2 of the adhesive layer 21, thereby ensuring the thickness of the adhesive layer 21 adjacent to the barrier layer 4. This maintains the ability of the adhesive layer 21 to follow deformations of the first exterior wall panel P1 and the second exterior wall panel P2, and can suppress cracks in the exterior material 3 and cracks in the adhesive layer 21.

[0049] In this way, the exterior wall structure 1 of this embodiment can suppress cracks in the exterior material 3, cracks in the adhesive layer 21, and infiltration (penetration) of moisture into the wall base materials 8, 8 of the first exterior wall panel P1 and the second exterior wall panel P2 by the above-mentioned barrier layer 4. These suppression effects can be exerted even if the opening 9 is provided adjacent to the sealant 20, as shown in Figures 4 and 5. Therefore, the exterior wall structure 1 of this embodiment can suppress peeling of the exterior material 3 for a long period of time.

[0050] If the maximum thickness W1 (shown in FIG. 3) of the barrier layer 4 becomes smaller than necessary, there is a risk that it will not be possible to sufficiently prevent moisture from penetrating into the wall base materials 8, 8 of the first exterior wall panel P1 and the second exterior wall panel P2. For this reason, it is preferable that the maximum thickness W1 of the barrier layer 4 be set to 10% or more of the maximum thickness W2 of the adhesive layer 21.

[0051] The maximum thickness W1 of the barrier layer 4 is preferably set to 0.05 to 0.20 mm. By setting the maximum thickness W1 to 0.20 mm or less, the thickness of the adhesive layer 21 adjacent to the barrier layer 4 is ensured, and the adhesive layer 21 maintains its ability to follow deformations of the first exterior wall panel P1 and the second exterior wall panel P2. This can suppress cracks in the exterior material 3 and cracks in the adhesive layer 21. On the other hand, by setting the maximum thickness W1 to 0.05 mm or more, the intrusion of moisture into the wall base materials 8, 8 of the first exterior wall panel P1 and the second exterior wall panel P2 can be suppressed, and peeling of the exterior material 3 can be prevented. From this viewpoint, the maximum thickness W1 is preferably 0.17 mm or less, and preferably 0.08 mm or more.

[0052] The barrier layer 4 may be formed as appropriate as long as it is non-permeable. The barrier layer 4 in this embodiment is formed of a cured resin 4A. Such a cured resin 4A can suppress the intrusion of moisture into the wall base materials 8, 8 of the first exterior wall panel P1 and the second exterior wall panel P2 while maintaining the maximum thickness W1 of the barrier layer 4 within the above-mentioned range.

[0053] The cured resin 4A (barrier layer 4) can be formed by a known oil-based sealer or water-based sealer. These oil-based and water-based sealers can easily form the cured resin 4A, which has excellent water impermeability. Of the oil-based and water-based sealers, it is preferable to form the cured resin 4A by an oil-based sealer. Such an oil-based sealer has a shorter drying time than water-based sealers, and therefore improves workability. Examples of oil-based sealers include acrylic resin-based oil-based sealers and oil-based sealers whose main component is a reactive curing special acrylic resin.

[0054] The cured resin 4A (barrier layer 4) may be formed from an emulsion-based paint. Such an emulsion-based paint forms a cured resin 4A with excellent water impermeability and has excellent paintability, improving workability.

[0055] Any known emulsion paint can be used. An example of the emulsion paint is an emulsion paint mainly composed of acrylic silicone or urethane resin.

[0056] As shown in Fig. 3, the length L1 of the barrier layer 4 in the horizontal direction (x-axis direction) is preferably set to 150 to 450 mm. By setting the length L1 to 150 mm or more, the barrier layer 4 is formed over a wide range of the side regions 25, 25 where the exterior material 3 and the adhesive layer 21 are likely to crack, so that the intrusion of moisture into the wall base materials 8, 8 of the first exterior wall panel P1 and the second exterior wall panel P2 can be suppressed. On the other hand, by setting the length L1 to 450 mm or less, the barrier layer 4 is prevented from being formed more than necessary, so that the workability can be improved and the cost can be reduced. From this viewpoint, the length L1 is preferably 200 mm or more and preferably 400 mm or less.

[0057] When the multiple exterior packaging materials 3 include an exterior packaging material 3A that straddles the sealing material 20, cracks or cracks in the adhesive layer 21 are likely to occur in the exterior packaging material 3A. For this reason, it is preferable that the barrier layer 4 overlaps in the wall thickness direction (z-axis direction) with at least a part of the exterior packaging material 3B that is adjacent in the horizontal direction (x-axis direction) to the exterior packaging material 3A that straddles the sealing material 20. This allows the barrier layer 4 to more reliably block moisture that has infiltrated through the cracks or cracks, even if cracks or cracks in the adhesive layer 21 occur in the exterior packaging material 3A that straddles the sealing material 20. In order to effectively exert such an effect, it is more preferable that the barrier layer 4 overlaps in the wall thickness direction with the horizontal center position 3Bc of the adjacent exterior packaging material 3B.

[0058] The barrier layer 4 can be appropriately arranged in the side regions 25, 25 on the sealant side of each of the first exterior wall panel P1 and the second exterior wall panel P2. As shown in Figs. 4 and 5, when the opening 9 is adjacent to the sealant 20, cracks in the exterior material 3 and cracks in the adhesive layer 21 are likely to occur in the first side regions 25A, 25A above the opening 9 and the second side regions 25B, 25B below the opening 9. For this reason, it is preferable that the barrier layer 4 is arranged at least in the first side regions 25A, 25A and the second side regions 25B, 25B. As a result, even if cracks in the exterior material 3 and cracks in the adhesive layer 21 occur in these regions 25A, 25B, the intrusion (permeation) of moisture into each of the wall base materials 8, 8 of the first exterior wall panel P1 and the second exterior wall panel P2 can be suppressed, and the exterior material 3 can be prevented from peeling off.

[0059] As shown in Fig. 3, it is preferable that the barrier layer 4 does not cover the outer surface 2o of the sealant 20. This prevents the sealant 20 from being strongly attached to the barrier layer 4, and prevents so-called three-sided adhesion. This can prevent cracks in the sealant 20 over a long period of time and prevent moisture from penetrating into the wall base materials 8, 8 of the first exterior wall panel P1 and the second exterior wall panel P2.

[0060] 4 and 5, the barrier layer 4 may be provided in a side region 27 on the horizontal side (x-axis direction) opposite the side region 25 on the sealing material 20 side of an exterior wall panel (in this example, the first exterior wall panel P1) having an opening 9. This side region 27, like the side region 25, tends to have large interlayer deformation behavior, and is relatively susceptible to cracking of the exterior material 3 and cracks in the adhesive layer 21. By providing the barrier layer 4 in this side region 27, peeling of the exterior material 3 and the like can be suppressed for a long period of time.

[0061] [Interior materials] As shown in Fig. 1, the interior material 5 of this embodiment is fixed to the building inner side S2 with respect to the frame 7 of the first exterior wall panel P1 and the frame 7 of the second exterior wall panel P2. The interior material 5 of this embodiment includes a second insulating material 42 and an interior base material 43, but some of these may be omitted or other members may be included depending on the specifications of the exterior wall structure 1, etc. Such an interior material 5 may be fixed integrally with the first exterior wall panel P1 and the second exterior wall panel P2, for example, in a factory or the like, or may be fixed integrally at the construction site.

[0062] The second insulating material 42 is disposed on the building inner side S2 of the first exterior wall panel P1 and the second exterior wall panel P2, and is formed in a panel shape. The second insulating material 42 can be made of an insulating material including, for example, a fiber-based insulating material (rock wool, glass wool, etc.) or a resin-based insulating material (polystyrene foam, urethane foam, phenol foam, etc.). The interior base material 43 is made of, for example, gypsum board. The interior base material 43 is disposed on the building inner side S2 of the second insulating material 42.

[0063] [Building exterior wall structure (second embodiment)] In the above embodiment, the barrier layer 4 shown in Fig. 3 is formed of the cured resin 4A, but is not limited to such an embodiment. For example, the barrier layer 4 may be formed of a cured second adhesive (not shown). Like the cured resin 4A, the cured second adhesive can suppress the intrusion of moisture into the wall base materials 8, 8 of the first exterior wall panel P1 and the second exterior wall panel P2 while maintaining the maximum thickness W1 of the barrier layer 4 within the above range.

[0064] The second adhesive (not shown) is preferably made of an elastic adhesive, similar to the first adhesive 21 A. Such a second adhesive has a better compatibility with the first adhesive 21 A than the oil-based sealer or emulsion-based paint of the previous embodiments, and therefore it is possible to more reliably prevent cracks at the interface between the barrier layer 4 and the adhesive layer 21.

[0065] The cured product of the second adhesive (not shown) preferably has a smaller elastic modulus than the cured product of the first adhesive 21A (adhesive layer 21). This makes the cured product of the second adhesive less susceptible to cracking than the cured product of the first adhesive 21A (adhesive layer 21), and therefore the infiltration of moisture into the wall base materials 8, 8 of the first exterior wall panel P1 and the second exterior wall panel P2 can be suppressed. Here, the "elastic modulus" refers to the slope determined from the stress-elongation relationship of a dumbbell-shaped test piece in accordance with JIS K6251 "Vulcanized rubber and thermoplastic rubber - Determination of tensile properties".

[0066] The ratio E2 / E1 of the elastic modulus E2 of the cured product of the second adhesive to the elastic modulus E1 of the cured product of the first adhesive 21A (adhesive layer 21) is preferably 0.3 to 0.9. By setting the ratio E2 / E1 to 0.9 or less, cracks are less likely to occur in the cured product of the second adhesive compared to the cured product of the first adhesive 21A (adhesive layer 21), and the infiltration of moisture into the wall base materials 8, 8 of the first exterior wall panel P1 and the second exterior wall panel P2 can be suppressed. On the other hand, by setting the ratio E2 / E1 to 0.3 or more, the strength of the second adhesive can be maintained.

[0067] The second adhesive may be appropriately selected as long as its elastic modulus after curing is smaller than that of the cured product of the first adhesive 21A (adhesive layer 21). As described above, when a modified silicone-based or urethane-based elastic adhesive is selected as the first adhesive 21A, for example, a modified silicone-based, acrylic-based, acrylic urethane-based, polyurethane-based elastic adhesive, etc. may be selected as the second adhesive.

[0068] [Building exterior wall structure (third embodiment)] The exterior wall structure 1 of the above embodiment includes the first exterior wall panel P1 and the second exterior wall panel P2, but is not limited to such an embodiment. For example, the exterior wall structure 1 may further include a third exterior wall panel in addition to the first exterior wall panel P1 and the second exterior wall panel P2. Figure 6 is a front view showing the wall base material 8 of the first exterior wall panel P1, the wall base material 8 of the second exterior wall panel P2, and the wall base material 8 of the third exterior wall panel P3 in another embodiment of the present invention.

[0069] In the exterior wall structure 1 of this embodiment, the second exterior wall panel P2 and the third exterior wall panel P3 are disposed adjacent to each other on both sides of the first exterior wall panel P1 in the horizontal direction (x-axis direction). Sealing materials 20, 20 extending in the up-down direction (y-axis direction) are provided between the first exterior wall panel P1 and the second exterior wall panel P2 (joint 19), and between the first exterior wall panel P1 and the third exterior wall panel P3 (joint 19), respectively.

[0070] The barrier layer 4 is disposed between the first exterior wall panel P1 and the adhesive layer 21 (shown in FIG. 3), between the second exterior wall panel P2 and the adhesive layer 21 (shown in FIG. 3), and between the third exterior wall panel P3 and the adhesive layer 21 (not shown). Furthermore, the barrier layer 4 is disposed in the side regions 25, 25 on the sealant 20 side of each of the first exterior wall panel P1 and the second exterior wall panel P2, and in the side regions 28, 28 on the sealant 20 side of each of the first exterior wall panel P1 and the third exterior wall panel P3. The maximum thickness W1 (shown in FIG. 3) of the barrier layer 4 is set within the above-mentioned range.

[0071] In the exterior wall structure 1 of this embodiment, as in the previous embodiments, it is possible to suppress cracks in the exterior material 3, cracks in the adhesive layer 21, and the infiltration (penetration) of moisture into the wall base materials 8, 8 of the first exterior wall panel P1 and the second exterior wall panel P2. Furthermore, in this embodiment, the infiltration (penetration) of moisture into the wall base material 8 of the third exterior wall panel P3 is suppressed. Therefore, even if the exterior wall structure 1 of this embodiment further includes the third exterior wall panel P3, peeling of the exterior material 3 and the like can be suppressed over a long period of time.

[0072] The barrier layer 4 may be disposed as appropriate in the side regions 28, 28 on the sealant side of each of the first exterior wall panel P1 and the third exterior wall panel P3. When the opening 9 is adjacent to the sealant 20 as in this embodiment, cracks in the exterior material 3 and cracks in the adhesive layer 21 are likely to occur in the first side regions 28A, 28A above the opening 9 and in the second side regions 28B, 28B below the opening 9. For this reason, it is preferable that the barrier layer 4 is disposed at least in the first side regions 28A, 28A and the second side regions 28B, 28B.

[0073] The first exterior wall panel P1 of this embodiment includes two wall base materials 8, 8. These wall base materials 8, 8 are arranged adjacent to each other in the horizontal direction (x-axis direction) via a sealant 26 extending in the vertical direction (y-axis direction). For these wall base materials 8, 8, the barrier layer 4 is not arranged in the side regions 29, 29 on the sealant 26 side. This is because the side regions 29, 29 have smaller interlayer deformation behavior than the side regions 25 of the first exterior wall panel P1 and the second exterior wall panel P2 and the side regions 28 of the first exterior wall panel P1 and the third exterior wall panel P3, and therefore cracks in the exterior material 3 and cracks in the adhesive layer 21 are less likely to occur. By not arranging the barrier layer 4 in such side regions 29, 29, it is possible to improve workability and reduce costs.

[0074] Although a particularly preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the illustrated embodiment and can be modified and carried out in various forms.

[0075] [Note] The present invention includes the following aspects.

[0076] [Invention 1] An exterior wall structure of a building, A first exterior wall panel; A second exterior wall panel arranged horizontally adjacent to the first exterior wall panel via a sealing material extending in the vertical direction; A plurality of exterior materials are fixed to the outer surfaces of the first exterior wall panel, the second exterior wall panel, and the sealant facing the outside of the building via adhesive layers made of a cured product of a first adhesive; a barrier layer disposed between the first exterior wall panel and the adhesive layer and between the second exterior wall panel and the adhesive layer, the barrier layer having water impermeability; The barrier layer is disposed on a side region of the sealant side of each of the first exterior wall panel and the second exterior wall panel, The maximum thickness of the barrier layer is 30% or less of the maximum thickness of the adhesive layer. Exterior wall structure of the building. [Invention 2] The building exterior wall structure described in Invention 1, wherein the barrier layer does not cover the outer surface of the sealant. [Invention 3] 3. The exterior wall structure of a building according to claim 1 or 2, wherein the horizontal length of the barrier layer is 150 to 450 mm. [Invention 4] the barrier layer is made of a cured resin, 4. The exterior wall structure of a building according to any one of claims 1 to 3, wherein the cured resin is formed from an oil-based sealer. [Invention 5] the barrier layer is made of a cured product of a second adhesive, 4. The exterior wall structure of a building according to any one of Inventions 1 to 3, wherein the cured product of the second adhesive has a smaller elastic modulus than the cured product of the first adhesive. [Invention 6] 6. The exterior wall structure of a building according to any one of Inventions 1 to 5, wherein the maximum thickness of the barrier layer is 0.05 to 0.20 mm. [Invention 7] At least one of the first exterior wall panel and the second exterior wall panel has an opening, The exterior wall structure of a building according to any one of Inventions 1 to 6, wherein the opening is provided adjacent to the sealant. [Invention 8] The building exterior wall structure according to any one of Inventions 1 to 7, wherein the exterior material is a tile. [Explanation of symbols]

[0077] 1 External wall structure 3 Exterior materials 4. Barrier Layer 20 Sealing materials 21 Adhesive layer 21A First Adhesive 25 Side Area

Claims

1. An exterior wall structure of a building, A first exterior wall panel; A second exterior wall panel arranged horizontally adjacent to the first exterior wall panel via a sealing material extending in the vertical direction; A plurality of panels 3 are fixed to the outer surfaces of the first exterior wall panel, the second exterior wall panel, and the sealant facing the outside of the building via an adhesive layer made of a cured product of a first adhesive; a barrier layer disposed between the first exterior wall panel and the adhesive layer and between the second exterior wall panel and the adhesive layer, the barrier layer having water impermeability; The barrier layer is disposed on a side region of the sealant side of each of the first exterior wall panel and the second exterior wall panel, The maximum thickness of the barrier layer is 30% or less of the maximum thickness of the adhesive layer. Exterior wall structure of the building.

2. The building exterior construction of claim 1 , wherein the barrier layer does not cover an outer surface of the sealant.

3. 2. The building exterior wall structure according to claim 1, wherein the horizontal length of the barrier layer is 150 to 450 mm.

4. the barrier layer is made of a cured resin, The building exterior wall structure according to claim 1 , wherein the cured resin is formed from an oil-based sealer.

5. the barrier layer is made of a cured product of a second adhesive, The building exterior wall structure according to claim 1 , wherein the cured product of the second adhesive has a smaller elastic modulus than the cured product of the first adhesive.

6. 2. The building exterior wall structure according to claim 1, wherein the maximum thickness of the barrier layer is 0.05 to 0.20 mm.

7. At least one of the first exterior wall panel and the second exterior wall panel has an opening, The building exterior wall structure according to claim 1 , wherein the opening is provided adjacent to the sealant.

8. 8. The building exterior wall structure according to claim 1, wherein the exterior material is a tile.

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