JP2016014299A - Exterior wall structure of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exterior wall structure of a building, which can increase strength of fixing a board-like heat insulation material to a mounting substrate, without deteriorating workability when an interior board is fixed to the mounting substrate.SOLUTION: An exterior wall structure 2 of a building 1 includes: a mounting substrate 10 that is made of thin plate-type steel comprising inside and outside flanges 10b and 10c; an interior board 20 that is fixed to the inside flange 10b by a tapping screw 21; a board-like heat insulation material 30 that is fixed to the outside flange 10c by a tapping screw 31; and an exterior finishing material 40 that is fixed to an outside surface of the board-like heat insulation material 30. Strength of the outside flange 10c is set higher than that of the inside flange 10b.

Description

  The present invention relates to an outer wall structure of a building such as a house, and more particularly to a technique that is effective when applied to an outer wall of a high-tightness, high-heat-insulating house made of thin steel plate.

  Conventionally, in a highly airtight and highly heat-insulated house made of thin plate steel (thin plate light weight steel), a grooved frame made of thin plate steel is used as the mounting base, and an internal board (gypsum) using a tapping screw on the inner flange of this frame Board) and the board-like insulation is fixed to the outer flange using a tapping screw to form a wall, and the exterior finishing material such as siding material is fixed to the outer surface of the board-like insulation using a tapping screw. Thus, an outer wall having heat insulation of the next generation energy saving level is configured (for example, see Non-Patent Document 1).

“KC type steel house insulation, dew prevention, confidential design manual”, Steel House Association, November 2003, p. 23, p. 43

  In the above conventional outer wall structure, the thickness of the board-like heat insulating material fixed to the outer flange of the frame is about 3 cm. Therefore, an exterior finishing material is pasted on the outer surface of the board-like heat insulating material, and the board-like heat insulating material is attached together with the finishing material. Even when the material is fixed to the frame with screws, the downward moment applied by the screw to the frame is small, and the board-shaped heat insulating material and exterior finishing material are securely held at the specified mounting position with the frame made of thin steel plate. It was difficult to cause problems such as the downward displacement of the heat insulating material.

  However, in recent years, houses with extremely small heating and cooling loads, such as zero energy houses, have been required, and accordingly, board-like heat insulating materials having a thickness two to three times that of conventional ones have been used. . In the outer wall structure using such a thick board-like heat insulating material, a screw that is longer by the thickness of the heat insulating material is used as a screw for fixing the heat insulating material to the frame. The downward moment becomes large, and the frame made of thin plate steel has insufficient strength against the moment of the screw, and there is a possibility that the board-shaped heat insulating material and the exterior finishing material are displaced downward.

  On the other hand, with respect to the above problem, a method for solving the above-described problem of deviation of the board-shaped heat insulating material or the like by using a lightweight steel or the like that is thicker than the thin steel plate and can be expected to have a predetermined screw holding force as a frame. However, in this method, the ease of installation of the interior board pasting work is impaired for the following reasons.

  That is, when the board-like heat insulating material and the exterior finish material are screwed and fixed to the frame using a tapping screw, two types of driving sources are generally used as a hand tool for screwing the tapping screw. One is an electric driver using an electric motor as a drive source, and the other is an air driver using compressed air supplied from an air compressor as a drive source. These two types of drivers are greatly different in the burden on the operator when performing the screwing operation using the same tapping screw.

  When fixing the interior board to the inner flange of the frame, it is necessary to screw the tapping screws into the frame at a pitch of 10 to 15 cm, but if the interior board pasting work of about 40 tsubo is done using an electric screwdriver, The working time is about three times as long as when using an air driver, and the burden on the operator's wrist is also increased. Therefore, it is appropriate to use the interior board as a standard work by screwing the interior board to the frame using an air driver. On the other hand, the fixing of the outer board-like heat insulating material and the exterior finishing material is performed using a large tapping screw at a pitch of 30 to 45 cm, and thus an electric screwdriver capable of obtaining a torque larger than that of an air screwdriver is used.

  However, the air driver has a small torque and can be used for screwing work on a thin steel frame, but it is used for screwing light weight steel frame having a plate thickness of 1.2 mm or more. It is not possible. Moreover, since the frame is formed by bending a plate material having a constant thickness, the inner flange and the outer flange have the same thickness. Therefore, if a lightweight steel plate with a large thickness is used as a frame in order to cope with an increase in the thickness of the board-like heat insulating material, an air driver cannot be used for fixing the interior board. As a result of using it, its workability is impaired.

  An object of the present invention is to solve such a point, and the object of the present invention is to provide a board-like heat insulating material to the mounting base without deteriorating the workability when fixing the interior board to the mounting base. An object of the present invention is to provide a building outer wall structure that can increase the fixing strength of the building.

  The outer wall structure of a building according to the present invention includes a thin steel plate mounting base having an inner flange and an outer flange, an interior board fixed to the inner flange by a tapping screw, and a board fixed to the outer flange by a tapping screw. The outer wall structure of a building having a wall-shaped heat insulating material and an exterior finishing material fixed to the outer surface of the board-shaped heat insulating material, wherein the strength of the outer flange is higher than the strength of the inner flange. .

  The “thin plate steel” in the above configuration is a lightweight steel having a thickness of 0.4 mm or more and less than 2.3 mm. Further, the “strength” of each flange in the above configuration is a mechanical strength indicating resistance to a moment applied from a screw screwed into the flange.

  The outer wall structure of the building according to the present invention is the above-described configuration, wherein the mounting base is formed by integrally forming the inner flange and the outer flange with a web sandwiched by a thin plate having a constant plate thickness. Is constituted by a single thin plate, and the outer flange is preferably constructed by folding the thin plate into two or more layers.

  Moreover, in the outer wall structure of the building of the present invention, in the above configuration, the thickness of the inner flange is preferably 1.2 mm or less.

  Furthermore, the outer wall structure of the building according to the present invention has an intermediate heat insulating material between the interior board and the board-shaped heat insulating material in the above-described configuration, and a thermal resistance value of the board-shaped heat insulating material is a It can be set as the structure larger than resistance value.

  The “thermal resistance value” is a value representing the difficulty of heat transfer of the heat insulating material, and is obtained by the following equation: heat resistance value = thickness of heat insulating material / thermal conductivity.

  ADVANTAGE OF THE INVENTION According to this invention, the outer wall structure of the building which can raise the fixed intensity | strength of the board-shaped heat insulating material to a mounting base can be provided, without impairing the workability at the time of fixing an interior board to a mounting base.

It is a longitudinal cross-sectional view of the outer wall of the building which is one Embodiment of this invention. It is a cross-sectional view of the outer wall shown in FIG. It is a front view of the panel which comprises the outer wall shown in FIG. It is sectional drawing which expands and shows the fixed part of the interior board with respect to a flame | frame, and board-shaped heat insulating material. FIG. 5 is a perspective view of the frame shown in FIG. 4. (A)-(d) is sectional drawing which shows the modification of the flame | frame shown in FIG. 5, respectively.

  Hereinafter, the present invention will be described in more detail with reference to the drawings.

  1 to 5 show a case where the outer wall structure of a building of the present invention is applied to an outer wall 2 of a highly airtight and highly insulated house (building) 1 made of a thin plate steel (thin plate light weight steel). This outer wall 2 which becomes one Embodiment of this invention is fixed between the foundation 3 of the house 1, and the joist 4 for ceilings, for example, and comprises the wall which faces the outside of this house 1. Reference numeral 5 denotes a floor of the house 1.

  The outer wall 2 has a plurality of frames 10 made of thin plate steel (thin plate light weight steel) as an attachment base. Each of these frames 10 has a groove shape including a web 10a, an inner flange 10b, and an outer flange 10c. 3 and the joist 4 are arranged side by side. Further, as shown in FIG. 2, these frames 10 are arranged side by side with a predetermined interval in the lateral direction. For example, these frames 10 are fixed to a groove-shaped lower runner 11 at their lower ends and fixed to a groove-shaped upper runner 12 at their upper ends. The upper runner 12 is fixed to the joist 4 by being fixed, so that it is fixed between the foundation 3 and the joist 4.

  For convenience, in FIG. 2, only one frame 10 is given the reference numerals of the web 10 a, the inner flange 10 b, and the outer flange 10 c, but the web 10 a and the inner flange 10 b are attached to all the frames 10 shown in FIG. 2. And an outer flange 10c.

  An interior board 20 is fixed to the inner flange 10 b of the frame 10 with a tapping screw 21. The tapping screw 21 is screwed into the inner flange 10b through the interior board 20 from the indoor side, and fixes the interior board 20 to the inner flange 10b. The screwing and fixing to the inner flange 10b of the interior board 20 by the tapping screw 21 is performed at a pitch of 10 to 15 cm, for example.

  The interior board 20 can be composed of, for example, a rectangular gypsum board having a predetermined size. Wallpaper or the like is attached to the interior surface of the interior board 20 as necessary.

  On the other hand, a board-like heat insulating material 30 is fixed to the outer flange 10 c of the frame 10 with a tapping screw 31. In the case shown in the figure, a plurality of board-like heat insulating materials 30 having a rectangular plate shape of a predetermined size are arranged without gaps and fixed to the outer flange 10 c of the frame 10. The tapping screw 31 is a large screw that is thicker and longer than the tapping screw 21 that fixes the interior board 20 to the inner flange 10b. The tapping screw 31 is screwed into the outer flange 10c from the outdoor side through the board-like heat insulating material 30, and the board-like heat insulating material. 30 is fixed to the outer flange 10c. Screw fixing of the board-like heat insulating material 30 to the frame 10 with the tapping screw 31 is performed at a pitch of 30 to 45 cm, for example.

  The board-shaped heat insulating material 30 may be configured such that a foamed heat insulating material such as polystyrene foam is formed in a rectangular board shape having a predetermined size. Further, as shown in the drawing, the board-shaped heat insulating material 30 is a means for attaching a board-shaped surface material 30b formed of a plywood or the like on the outer surface of a heat insulating material main body 30a made of a foam heat insulating material, such as a double-sided tape or an adhesive. It can also be set as the structure affixed by. In this case, before the heat insulating material body 30a is fixed to the frame 10 with the tapping screw 31, it is temporarily fixed to the board-shaped surface material 30b in advance by a sticking means such as a double-sided tape, and is integrated by temporary fixing. It is preferable that the heat insulating body 30a and the board-shaped face material 30b are fixed to the frame 10 with a tapping screw 31. As described above, by providing the board-like face material 30b, it is possible to improve the shape retainability of the board-like heat insulating material 30, that is, the outer wall 2.

  An exterior finishing material 40 is fixed to the outer surface of the board-shaped heat insulating material 30 with a tapping screw 41. In the case shown in the drawing, a plurality of exterior finishing materials 40 having a rectangular plate shape of a predetermined size are arranged without gaps and fixed to the outer surface of the board-like heat insulating material 30. Thereby, the outer surface of the board-shaped heat insulating material 30 is covered with the exterior finishing material 40. The tapping screw 41 is a screw having an intermediate size between the tapping screw 21 for fixing the interior board 20 to the inner flange 10b and the tapping screw 31 for fixing the board-shaped heat insulating material 30 to the outer flange 10c. The exterior finishing material 40 is fixed to the board-shaped heat insulating material 30 by being screwed into the board-shaped heat insulating material 30 through the material 40. The tapping screw 41 may be screwed into the outer flange 10c from the outdoor side through the exterior finishing material 40 and the board-like heat insulating material 30 and fixed to the outer flange 10c together with the board-like heat insulating material 30. . In this case, as the tapping screw 41, a large screw having a length that can reach the outer flange 10c is used. The screwing and fixing of the exterior finishing material 40 to the board-like heat insulating material 30 and the outer flange 10c by the tapping screw 41 is performed at a pitch of 30 to 45 cm, for example, similarly to the screwing and fixing of the board-like heat insulating material 30 to the frame 10. Further, as shown in FIG. 4, the tapping screw 41 is screwed so that its head is buried in the exterior finishing material 40, and the concave portion generated by the buried head is filled with the filler X. Yes.

  The exterior finishing material 40 can be composed of, for example, an exterior panel material composed of ALC (lightweight cellular concrete cured by autoclave), but is composed of a metal siding material or the like. You can also. Note that the joint portions of the plurality of exterior finishing materials 40 are filled with, for example, the filler X.

  As shown in FIG. 2, an airtight tape 43 may be attached to the surface facing the outdoor side of the butted portion of the adjacent board-shaped heat insulating materials 30. By closing the abutting portions of the adjacent board-like heat insulating materials 30 with the airtight tape 43, the airtightness of the outer wall 2 can be improved, and the house 1 can be configured as a highly airtight and highly heat-insulated house.

  As shown in the figure, a ventilator edge 50 can be provided between the board-like heat insulating material 30 and the exterior finishing material 40. The ventilation trunk edge 50 may be formed in a plate shape having a rectangular cross section that extends in the vertical direction by, for example, wood, and may be configured to be fixed to the outer flange 10 c of the frame 10 together with the board-like heat insulating material 30 by a tapping screw 31. In this case, it is preferable that the tapping screw 41 for fixing the exterior finishing material 40 to the board-shaped heat insulating material 30 is screwed into the board-shaped heat insulating material 30 through the ventilation trunk edge 50. As described above, the ventilation channel edge 50 is provided between the board-shaped heat insulating material 30 and the exterior finishing material 40, so that the air flow channel 51 is provided between the board-shaped heat insulating material 30 and the exterior finishing material 40. By forming, the thermal conductivity from the exterior finishing material 40 to the board-like heat insulating material 30 at an abnormally high temperature can be reduced. Moreover, when ALC is used as the exterior finishing material 40, the exterior finishing material 40 can be efficiently dried by the ventilation channel 51, and its durability can be enhanced.

  The ventilator edge 50 is not limited to wood but can be made of metal.

  The outer wall 2 of the present invention having such a structure can be constructed by sequentially assembling the frame 10, the interior board 20, the board-like heat insulating material 30, the exterior finishing material 40, and the like at the construction site. It can also be constructed by a panel construction method that combines a plurality of panels manufactured at the construction site.

  As shown in FIG. 3, the panel 60 used in the panel method is manufactured in a factory by fixing a plurality of board-like heat insulating materials 30 and a plurality of exterior finishing materials 40 to a frame 10 (not shown in FIG. 3). . The panel 60 is sized to be transported from the factory to the construction site. And the outer wall 2 is constructed | assembled by combining these several panels 60 in a construction site, and fixing the several interior board 20 to the inner side flange 10b of the flame | frame 10 after that. In such a panel method, the board-like heat insulating material 30 and the exterior finishing material 40 can be fixed to the frame 10 at the factory, so that the high-quality outer wall 2 can be constructed in a short period of time.

  FIG. 4 is an enlarged cross-sectional view showing a fixed portion of the interior board 20 and the board-like heat insulating material 30 with respect to the frame 10.

  In the present invention, the fixing operation of the interior board 20 by the tapping screw 21 to the inner flange 10b of the frame 10 is facilitated while the tapping screw 31 for fixing the board-like heat insulating material 30 to the frame 10 is securely supported by the outer flange 10c of the frame 10. In order to be able to do this, the strength of the outer flange 10c of the frame 10 is made higher than the strength of the inner flange 10b. More specifically, the frame 10 is configured such that the outer flange 10c is thicker than the inner flange 10b, and the strength of the outer flange 10c of the frame 10 is higher than the strength of the inner flange 10b. . The “strength” of the flanges 10b and 10c is a strength indicating resistance to a moment applied from the tapping screws 21 and 31 screwed into the flanges 10b and 10c, that is, mechanical strength such as bending strength and shear strength. That is.

  As shown in FIGS. 4 and 5, in the present embodiment, the frame 10 is formed by bending a thin plate 70 having a constant plate thickness, so that a flat inner flange 10b and an outer side are formed on both sides of the flat web 10a. The flange 10c is formed in a groove shape which is connected at right angles and integrally. The inner flange 10b is constituted by a single thin plate 70 constituting the frame 10, whereas the outer flange 10c is formed by folding the thin plate 70 constituting the frame 10 so that the thin plate 70 becomes 2 pieces. It is a double structure in which the sheets are stacked. In other words, the outer flange 10c is configured such that two thin plates 70 are stacked, and has a thickness twice that of the inner flange 10b configured by one thin plate 70 (double strength). ing.

  As described above, in the present invention, the inner flange 10b is composed of one thin plate 70, while the outer flange 10c has a double structure composed of the two thin plates 70 folded back, the strength of the outer flange 10c is increased to that of the inner flange 10b. I try to make it higher than the strength. Therefore, for example, in order to reduce the cooling / heating load in a zero energy house or the like, a board-like heat insulating material 30 having a thickness two to three times that of the conventional one is used, and the board-like heat insulating material 30 is fixed to the frame 10. As the tapping screw 31, a tapping screw 31 that is longer by the thickness of the board-like heat insulating material 30 is used. Even if the downward moment applied to the outer flange 10c by the tapping screw 31 is increased, the thickness is doubled by folding the thin plate 70. The tapping screw 31 can be reliably supported by the outer flange 10c, and the board-like heat insulating material 30 and the exterior finishing material 40 can be reliably supported on the frame 10.

  On the other hand, even if the outer flange 10 c is formed in a thick shape having a strength corresponding to the increased board-like heat insulating material 30, the inner flange 10 b of the frame 10 is constituted by a single thin plate 70. Therefore, when the interior board 20 is fixed to the inner flange 10b of the frame 10 using the tapping screw 21, the tapping screw 21 can be easily screwed into the inner flange 10b, and the workability is good.

  As described above, in the present invention, the frame 10 serving as the mounting base of the interior board 20 and the board-shaped heat insulating material 30 is configured such that the outer flange 10c is thicker than the inner flange 10b, so that the outer side than the inner flange 10b. Since the strength of the flange 10c is increased, the securing strength of the board-like heat insulating material 30 to the frame 10 can be ensured and the work can be easily performed when the interior board 20 is fixed to the frame 10. . That is, the fixing strength of the board-shaped heat insulating material 30 to the frame 10 can be increased without impairing the ease of construction when fixing the interior board 20 to the frame 10.

  In the present invention, the thickness of the thin plate 70 constituting the frame 10 is preferably 1.2 mm or less. By setting the thickness of the thin plate 70 to 1.2 mm or less, when the interior board 20 is fixed to the inner flange 10b of the frame 10 using the tapping screw 21, the tapping screw 21 can be screwed in using an air screwdriver. it can. Since it is possible to use an air driver that has higher work efficiency than an electric screwdriver, it is possible to further improve the workability of the work of fixing the interior board 20 to the inner flange 10b of the frame 10 with the tapping screw 21.

  The thickness of the thin plate 70 is more preferably 1.0 mm or less. By setting the thickness of the thin plate 70 to 1.0 mm or less, the work of fixing the interior board 20 to the inner flange 10b of the frame 10 with the tapping screw 21 using an air driver can be performed more efficiently.

  FIGS. 6A to 6D are cross-sectional views showing modifications of the frame shown in FIG.

  In the case shown in FIG. 5, the thin plate 70 is folded back twice to make the outer flange 10 c thicker than the inner flange 10 b, but the thin plate 70 is folded twice or more to form the outer flange 10 c. You can also For example, FIG. 6A shows a case where the thin plate 70 is configured by the thin plate 70 which is folded back three times and the outer flange 10c is stacked three times. In this way, by forming the outer flange 10c by folding the thin plate 70 a desired number of times, the outer flange 10c is configured to have a desired strength according to the thickness and weight of the board-like heat insulating material 30 and the exterior finishing material 40. be able to. In this case, the processing of the outer flange 10c can be easily performed using, for example, a roll forming machine.

  Further, the outer flange 10c is not limited to the configuration in which the thin plate 70 is folded back. For example, as illustrated in FIG. 6B, a configuration in which a thin plate 71 formed separately is attached to the outer flange 10c by welding or the like. It can also be. The thin plate 71 may be affixed to either the front or back side of the outer flange 10c, or a plurality of sheets may be affixed.

  Further, the outer flange 10c does not fold back the thin plate 70, for example, as shown in FIG. 6C, the plate thickness of the portion constituting the outer flange 10c of the thin plate 70 is set to the plate thickness of the portion constituting the inner flange 10b. A thicker configuration can also be used.

  Further, the frame 10 is not limited to the above-described groove shape as long as it has a shape having an inner flange 10b and an outer flange 10c. For example, the frame 10 may have various shapes such as a Z shape as shown in FIG. It can be made into the shape of this.

  As shown in FIGS. 2 and 4, in the outer wall 2 of the present invention, an intermediate heat insulating material 80 can be provided between the interior board 20 and the board-shaped heat insulating material 30 between the adjacent frames 10. . The intermediate heat insulating material 80 can be a fired heat insulating material having a board shape such as polystyrene foam, but can also be a fibrous heat insulating material such as glass wool or rock wool. The board-shaped intermediate heat insulating material 80 can be configured to be bonded to the inner surface of the board-shaped heat insulating material 30 facing the indoor side by a bonding means such as a double-sided tape or an adhesive. 80 can be configured to be packed between the interior board 20 and the board-like heat insulating material 30 while being accommodated in vinyl or the like.

  In the present invention, the thermal resistance value R1 of the board-shaped heat insulating material 30 is set to be larger than the thermal resistance value R2 of the intermediate heat insulating material 80. That is, the thermal resistance ratio R1 / R2 between the thermal resistance value R1 of the board-shaped heat insulating material 30 and the thermal resistance value R2 of the intermediate heat insulating material 80 is set to 1 or more. Thereby, while being able to further improve the heat insulation of the outer wall 2, the thermal gradient inside the outer wall 2 can be optimized, and the dew condensation inside the outer wall 2, generation | occurrence | production of mold | fungi, etc. can be suppressed.

  Heat resistance ratio R1 / R2 is 1 or more in Tokyo, 1.5 or more in Sendai / Koriyama, 2.5 in Hokkaido south of Sapporo, 3.4 in Asahikawa, etc. It is preferable to change the value to an appropriate value.

  As described above, in order to set the thermal resistance ratio R1 / R2 to a desired value depending on the region, it may be necessary to use a thicker board-like heat insulating material 30. On the other hand, in the present invention, even if the thickness of the board-like heat insulating material 30 is increased, the tapping screw 31 for fixing the thick board-like heat insulating material 30 to the frame 10 is reliably supported by the outer flange 10c having increased strength. In addition, the workability of fixing the interior board 20 using the tapping screw 21 can be favorably maintained by the inner flange 10b having a lower strength than the outer flange 10c. Therefore, the intermediate heat insulating material 80 is provided between the interior board 20 and the board-shaped heat insulating material 30 so that the thermal resistance value R1 of the board-shaped heat insulating material 30 is larger than the heat resistance value R2 of the intermediate heat insulating material 80. Also in the outer wall 2, the fixing strength of the board-shaped heat insulating material 30 to the frame 10 can be increased to a desired strength without impairing the ease of construction when fixing the interior board 20 to the frame 10. .

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  For example, in the said embodiment, although the case where the outer wall structure of this invention is applied to the outer wall 2 of the high airtight highly insulated house 1 is shown, various houses other than the highly airtight highly insulated house 1 and other than houses The present invention can also be applied to the outer wall of a building.

  INDUSTRIAL APPLICABILITY The present invention can be used when building an outer wall of a building that requires high heat insulation.

1 Highly airtight and highly insulated house (building)
2 outer wall 3 foundation 4 joist 5 floor 10 frame (mounting base)
10a web 10b inner flange 10c outer flange 11 lower runner 12 upper runner 20 interior board 21 tapping screw 30 board-like heat insulating material 30a heat insulating material body 30b board-like face material 31 tapping screw 40 exterior finishing material 41 tapping screw 43 airtight tape 50 ventilating trunk edge 51 through Air channel 60 Panel 70 Thin plate 71 Thin plate 80 Intermediate heat insulating material X Filling material

Claims (4)

A mounting base made of sheet steel with an inner flange and an outer flange;
An interior board fixed to the inner flange by a tapping screw;
A board-like heat insulating material fixed to the outer flange by a tapping screw;
An exterior wall structure of a building having an exterior finishing material fixed to the outer surface of the board-like heat insulating material,
The outer wall structure of a building, wherein the strength of the outer flange is higher than the strength of the inner flange.   The mounting base is formed by integrally forming the inner flange and the outer flange with a web sandwiched by a thin plate having a constant plate thickness, and the inner flange is constituted by one thin plate, and the outer flange The outer wall structure of a building according to claim 1, wherein the thin plate is folded back into two or more layers.   The outer wall structure of a building according to claim 1 or 2, wherein the inner flange has a thickness of 1.2 mm or less.   An intermediate heat insulating material is provided between the interior board and the board-shaped heat insulating material, and a thermal resistance value of the board-shaped heat insulating material is larger than a heat resistance value of the intermediate heat insulating material. The outer wall structure of the building according to any one of the above.

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