JP3906061B2 - Building structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a frame structure such as a wall, a floor, and a roof constituting a building frame.
[0002]
[Prior art]
A conventional building wall structure has a structure in which a heat insulating material is disposed between an outer wall and an inner wall. This wall structure is difficult to achieve sufficient heat insulating properties. In particular, when hot air in summer and cold air in winter enter the hollow portion between the outer wall and the inner wall, it becomes extremely difficult to achieve effective heat insulation characteristics. By making the hollow part between the outer wall and the inner wall into a completely sealed structure, the heat insulating property of the wall can be improved. However, in reality, it is extremely difficult to make the hollow part a completely sealed structure. For example, in a wooden building with a frame structure, since there are columns and beams in the hollow portion, it is extremely difficult to completely close the hollow portion formed between the columns above and below the wall. Furthermore, if the hollow portion has a completely closed structure, the air here is not ventilated, and mold is generated, resulting in an unsanitary condition, and a detrimental effect that causes condensation and corrosion.
[0003]
Furthermore, conventional buildings cannot eliminate the harmful effects of heat insulating materials. This is because a heat insulating material such as glass fiber is disposed outside the inner wall. The glass fiber disposed here becomes extremely fine fiber waste and enters the room through the gap between the inner walls. Glass fibers are frequently used as heat insulating materials for buildings because they have extremely excellent heat insulating properties and have a very constant cost. However, since glass fibers are aggregates of inflexible fine inorganic fibers, it is impossible to eliminate fine fiber waste. For this reason, it is impossible to completely avoid entering the room through the inner wall. To make matters worse, since recent buildings are extremely airtight, the fine glass fibers that have entered the room stagnate in the indoor air and are not discharged to the outside, deteriorating the indoor environment.
[0004]
Furthermore, as a building that effectively uses the thermal energy of the entire building, a system house in which air in a hollow portion between an inner wall and an outer wall circulates has been developed. In this building, the hollow part provided in the wall is used together with a duct through which air passes. The duct in the hollow portion can circulate room air up and down to reduce the temperature difference between the room top and bottom. However, since the glass fiber is disposed in the hollow portion used for the duct in the building having this structure, the adverse effect of the glass fiber scattering in the air becomes more remarkable. In order to avoid this harmful effect, the heat insulating material in the hollow portion cannot be removed. This is because the heat insulating properties of the wall are significantly reduced.
[0005]
[Problems to be solved by the invention]
The present inventor has developed a wall structure in which a hollow chip is filled with a wood chip obtained by pulverizing a natural wood into a small size for the purpose of eliminating this drawback. Since this wall structure uses wood chips as a heat insulating material instead of glass fibers, the disadvantage that fine glass fibers are scattered indoors can be solved. However, the wall structure using wood chips as a heat insulating material has a drawback that it takes much time for construction compared to glass fiber, and the construction cost is extremely high. In addition, there is a drawback that it is difficult to realize heat insulation properties comparable to glass fibers.
[0006]
Instead of glass fiber, a heat insulating material obtained by foaming synthetic resin is also used. This heat insulating material does not scatter fine fibers. Moreover, since it can be formed into a plate shape, it has the feature that it can be constructed more efficiently than wood chips. However, the heat insulating material of the synthetic resin foam has a drawback that it tends to generate harmful gases in the event of a fire, compared with glass fiber or wood chips. For this reason, there is a drawback that it is difficult to make the room a safer environment in the event of a fire.
[0007]
The present invention was further developed to solve this drawback, and the present invention can realize extremely excellent heat insulation characteristics, can make the indoor environment an ideal comfortable and comfortable environment, and is inexpensive. It is to provide a building frame structure that can be efficiently constructed using a heat insulating material.
Another important object of the present invention is to provide a building structure for a building that can automatically adjust the room to a comfortable humidity.
It is another object of the present invention to provide a building structure that can reduce the condensation and mold generated in the interior of a wall or the like and make the interior comfortable.
Furthermore, another important object of the present invention is to provide a building structure that can prevent the indoor environment from deteriorating in the event of a fire.
[0008]
[Means for Solving the Problems]
The building frame structure of the present invention includes a wall structure of a building, wherein a humidity adjusting natural plate 3 is provided between an outer wall 1 located on the outdoor side and an indoor plate 2 located on the indoor side of the building. An outdoor side hollow portion 4 is provided between the humidity adjusting natural plate 3 and an indoor side hollow portion 5 connected to the interior of the building is provided between the humidity adjusting natural plate 3 and the indoor plate 2. . The humidity adjusting natural plate 3 is stretched with a waterproof sheet 6 that restricts the passage of water and allows air to pass through on the surface on the outer wall 1 side. Furthermore, the humidity adjusting natural plate 3 is arranged and fixed so that natural wood 3A that expands and contracts due to humidity in the air is arranged so that a ventilation gap 7 is formed. The natural wood 3A that contracts when the humidity in the air is low widens the ventilation gap 7 to facilitate passage of air, and the natural wood 3A that expands when the humidity in the air is high narrows the ventilation gap 7 and passes air. Make it difficult.
[0009]
The outdoor side hollow portion 4 is preferably provided with a heat insulating material 8 made of glass fiber or synthetic resin foam. For the natural wood 3A of the humidity-adjusting natural plate 3, cedar, pine, cypress, drill and the like can be used. The natural wood 3A of the humidity adjusting natural plate 3 is provided with a connecting ridge 9 on one side, a connecting groove 10 for guiding the connecting ridge 9 on the other side, and guiding the connecting ridge 9 to the connecting groove 10. Adjacent natural wood 3A can be connected. This natural wood 3A can be provided with a ventilation gap 7 whose interval is adjusted by humidity by narrowing the width of the connecting projection 9 toward the tip and increasing the width of the connecting groove 10 toward the opening. .
[0010]
A plate-like heat insulating material 8 can be fixed to the outdoor side hollow portion 4 with a trunk edge 11 disposed at the boundary of the heat insulating material 8. The body edge 11 has holding projections 12 for fixing the heat insulating material 8 projecting on both sides, and the heat insulating material 8 can be fixed by the holding projections 12. Furthermore, the trunk edge 11 is fixed vertically, and a ventilation duct can be provided by providing a longitudinal groove 13 between the surface of the trunk edge 11 and the heat insulating material 8.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. However, the examples shown below exemplify the building frame structure for embodying the technical idea of the present invention, and the present invention does not specify the frame structure as follows.
[0012]
Further, in this specification, in order to facilitate understanding of the scope of claims, the numbers corresponding to the members shown in the embodiments are referred to as “claims” and “means for solving the problems”. It is added to the member shown by. However, the members shown in the claims are not limited to the members in the embodiments.
[0013]
The wall structure shown in the horizontal sectional view of FIG. 1 and the perspective view from which a part of FIG. 2 is removed has a humidity between the outer wall 1 located on the outdoor side of the building and the indoor plate 2 located on the indoor side of the building. The adjustment natural plate 3 is disposed, and the outdoor side hollow portion 4 and the indoor side hollow portion 5 are provided on both surfaces of the humidity adjustment natural plate 3. The outdoor side hollow portion 4 is provided between the outer wall 1 and the humidity adjusting natural plate 3, and the indoor side hollow portion 5 is provided between the humidity adjusting natural plate 3 and the indoor plate 2.
[0014]
In the illustrated wall structure, the indoor plate 2 is fixed to the indoor side of the column 14, the humidity adjusting natural plate 3 is fixed to the outdoor side, and the indoor side hollow portion is provided between the indoor plate 2 and the humidity adjusting natural plate 3. 5 is provided. In this wall structure, since the indoor plate 2 and the humidity adjusting natural plate 3 are fixed to both surfaces of the pillar 14, the thickness of the pillar 14 is the width of the indoor hollow portion 5. However, since the brace 15 and the base material for fixing the indoor plate 2 are provided between the columns, the substantial width of the indoor hollow portion 5 is narrowed by the brace. The indoor side hollow part 5 circulates indoor air. Therefore, a brace provided in the indoor hollow portion 5 is fixed between the columns 14 so as not to prevent the air circulation in the indoor hollow portion 5. In the illustrated wall structure, the width of the brace 15 is made narrower than the width of the indoor hollow portion 5 so that the air in the indoor hollow portion 5 can be circulated up and down.
[0015]
In the illustrated wall structure, the interior plate 2 is a plasterboard or natural board with a cloth on the surface, but a soil wall can also be used for the interior plate 2. As shown in the cross-sectional view of FIG. 1, the gypsum board and the natural board are fixed to the indoor side of the pillar, but the indoor plate 2 of the earth wall is interposed between the pillars 14 as shown in the horizontal cross-sectional view of FIG. The earth wall provided is provided with an indoor hollow portion 5 between the humidity adjusting natural plate 3 fixed to the pillar. A brace that is narrower than the indoor hollow portion 5 is fixed to the indoor hollow portion 5 so that the air here can be ventilated up and down. An air hole may be provided through the brace up and down to ventilate the air in the indoor hollow portion 5 up and down.
[0016]
The humidity adjusting natural plate 3 fixes and fixes natural wood 3 </ b> A that expands and contracts due to humidity in the air so that a ventilation gap 7 is formed. The natural wood 3A has a thickness of 30 mm and a width of 135 mm. However, the natural wood 3A can have a thickness of 20 to 50 mm and a width of 50 to 200 mm. When the natural wood 3A is thickened, the heat insulating property and soundproofing property of the wall are improved. However, since the construction cost increases when the natural wood 3A is thickened, the optimum value is set in consideration of both the construction cost and the heat insulation characteristics. Sugi is suitable for the natural wood 3A. Sugi has the advantage of having excellent heat insulating properties at low cost. It also has the feature of rapidly expanding and contracting with changes in humidity. However, for natural wood, pine, cypress, drill and the like can also be used. Pine and cypress have excellent soundproofing properties, and Kiri has excellent heat insulating properties.
[0017]
The plate-like natural wood 3A extends horizontally and is fixed to the pillar 14 horizontally. The natural wood 3A expands and contracts with the humidity in the air, contracts when the humidity in the air decreases, and expands when the humidity in the air increases. Therefore, the ventilation gap 7 provided between the natural timbers 3A is widened to facilitate passage of air when the humidity is low, and narrows the ventilation gap 7 to prevent passage of air when the humidity is high. The ventilation gap 7 provided between the natural wood 3A of the humidity adjusting natural plate 3 is automatically controlled by the humidity. Since the ventilation gap 7 becomes narrow when the humidity is high, the flow of air between the outdoor side hollow portion 4 and the indoor side hollow portion 5 is blocked or reduced. When the humidity is lowered, the ventilation gap 7 is widened, and the air between the outdoor side hollow portion 4 and the indoor side hollow portion 5 is easily circulated. That is, air flows between the indoor side hollow portion 5 and the outdoor side hollow portion 4.
[0018]
FIG. 4 is a sectional view of the humidity adjusting natural plate 3 cut vertically. The humidity adjusting natural plate 3 is provided with a connecting projection 9 on one side surface of the natural wood 3A, and a connecting groove 10 for guiding the connecting projection 9 on the other side surface. The humidity adjusting natural plate 3 connects the adjacent natural wood 3A by guiding the connecting protrusion 9 of the natural wood 3A to the connecting groove 10 of the adjacent natural wood 3A. Furthermore, in order to adjust the ventilation gap 7 by the contraction of the natural wood 3A, the humidity adjusting natural plate 3 gradually reduces the width of the connecting ridge 9 toward the tip and the connecting groove 10 toward the opening. The width is widened. When this natural wood 3A expands and approaches each other, the ventilation gap 7 becomes narrower. On the contrary, when the natural wood 3A contracts and separates from each other, the ventilation gap 7 becomes wide. However, the natural wood 3A can be processed to have a rectangular cross section as shown in the sectional view of FIG.
[0019]
The ventilation gap 7 is fixed to the pillar so as to be closed when the humidity is high, for example, when the humidity reaches 80%. Therefore, the natural wood 3A adjusts the ventilation gap 7 by the humidity when it is fixed to the pillar. When the humidity is 80% or more, it is fixed to a pillar so that there is no gap between the adjacent natural wood 3A. When the humidity is low, the width of the ventilation gap 7 is adjusted by the humidity and fixed to the pillar. A spacer is used when adjusting and fixing the ventilation gap 7 of the natural wood 3A. The spacer is sandwiched between the natural woods 3A and used as a thickness gauge. After fixing the natural wood 3A, the spacer is removed.
[0020]
The humidity adjusting natural plate 3 has a waterproof sheet 6 stretched on the surface on the outer wall 1 side. The waterproof sheet 6 is disposed in the outdoor side hollow portion 4 between the humidity adjusting natural plate 3 and the outer wall 1 to prevent water from passing through the humidity adjusting natural plate 3. Therefore, the waterproof sheet 6 is a plastic sheet that restricts the passage of water and allows air to pass. The waterproof sheet 6 is preferably the one that prevents passage of water and allows only air to pass.
[0021]
The outer wall 1 is fixed away from the humidity adjusting natural plate 3, and the outdoor side hollow portion 4 is provided between the humidity adjusting natural plate 3 and the outer wall 1. In the illustrated wall structure, a trunk edge 11 is fixed to the humidity adjusting natural plate 3, and an outer wall 1 is fixed to the trunk edge 11. The trunk edge 11 fixes the heat insulating material 8 to the outdoor side hollow portion 4. The trunk edge 11 is disposed at the boundary of the heat insulating material 8 and fixes the heat insulating material 8 at a fixed position of the outdoor side hollow portion 4. The body edge 11 is provided with holding projections 12 for fixing the heat insulating material 8 so as to protrude on both sides, and the heat insulating material 8 is fixed by the holding projections 12. The body edge 11 in the figure has the heat insulating material 8 disposed on the outer wall 1 side. However, the heat insulating material 8 can be fixed to the humidity adjusting natural plate 3 side with the left and right sides of the body edge 11 reversed.
[0022]
The trunk edge 11 is fixed vertically to the outside of the humidity adjusting natural plate 3. Since the natural wood 3A is fixed horizontally, the trunk edge 11 is fixed orthogonally to the natural wood 3A. The vertical trunk edge 11 is provided with a longitudinal groove 13 for providing a ventilation duct with the heat insulating material 8. This vertical groove 13 can efficiently convect the air in the outdoor side hollow portion 4 like a chimney in a state where the heat insulating material 8 is in close contact with the trunk edge 11. In particular, when it is hot in summer, there is a feature that air can be efficiently convected by the ventilation duct of the longitudinal groove 13 to cool the trunk edge 11 and the outdoor side hollow portion 4. The body edge 11 in the figure is provided in the longitudinal groove 13 between the heat insulating material 8, between the humidity adjusting natural plate 3 and the outer wall 1. The body edge 11 is fixed to the humidity adjusting natural plate 3 by nailing or bonding. The vertical groove 13 of the trunk edge 11 communicates the upper and lower ends with the outdoor side hollow portion 4.
[0023]
The outer wall 1 in the figure is an outer wall material such as a base siding fixed to the body edge 11 and a tile fixed to the surface of the base siding. When using a plate-like thing for the outer wall 1, the outer wall 1 can be directly fixed to the trunk edge 11 without using base siding or the like.
[0024]
FIG. 6 shows a floor structure to which the humidity adjusting natural plate 3 is fixed. In the floor structure of this figure, the humidity adjusting natural plate 3 is horizontally fixed on a base material 16 such as a joist or large draw through a lower plate such as a control panel. The humidity adjusting natural plate 3 fixes the same natural wood 3A as the above-mentioned wall structure in the same manner. That is, it fixes to the base material 16 so that the ventilation gap 7 automatically adjusted with humidity between natural wood 3A may be made. Furthermore, the same waterproof sheet 6 as the wall structure is stretched on the lower surface of the humidity adjusting natural plate 3. The waterproof sheet 6 prevents moisture under the floor from wetting the humidity adjusting natural plate 3. However, since rainwater rarely enters under the floor, the waterproof sheet 6 does not necessarily need to be stretched. A floor plate 17 is fixed on the humidity-adjusting natural plate 3 via a trunk edge 11. The indoor side hollow part 5 is provided between the floor board 17 and the humidity control natural board 3, and the heat insulating material 8 is arrange | positioned here. The heat insulating material 8 is fixed to the indoor hollow portion 5 with the same trunk edge 11 as that of the wall structure. Since the humidity adjusting natural plate 3 has sufficient strength, the structure for fixing the humidity adjusting natural plate to the lower plate is the same as the humidity adjusting natural plate 3 by omitting the joists and fixing the lower plate and the natural wood 3A to the large plate. can do. However, the natural wood 3A can be fixed to the joists and the humidity adjusted natural plate 3 can be provided.
[0025]
Further, FIG. 7 shows a roof structure using the humidity adjusting natural plate 3. In the roof structure of this figure, the humidity adjusting natural plate 3 is fixed on the rafter 18. The humidity adjusting natural plate 3 is provided by fixing the same natural wood 3A as the wall structure in the same manner. That is, the ventilation gap 7 is provided and fixed between the natural woods 3A. A waterproof sheet 6 is stretched on the upper surface of the humidity adjusting natural plate 3. As with the wall structure, the waterproof sheet 6 is a plastic sheet that restricts the passage of water and allows air to pass therethrough. Further, a roof base material 19 is fixed on the waterproof sheet 6 via the trunk edge 11, and an outdoor-side hollow portion 4 is provided between the base material 19 and the humidity adjusting natural plate 3. A heat insulating material 8 is fixed to the outdoor side hollow portion 4. The heat insulating material 8 is fixed to the indoor hollow portion 5 at the same trunk edge 11 as the wall structure. A roof material 20 such as a tile or a slate is fixed on the base material 19. The indoor plate 2 is fixed to the indoor side of the rafter 18, and the indoor hollow portion 5 can be provided between the humidity adjusting natural plate 3 and the indoor plate 2.
[0026]
A building having indoor side hollows 5 on the walls, floor, and roof can be an ideal environment in summer and winter. In the summer, as shown in FIG. 8, the warmed air gathered at the upper part of the indoor hollow portion 5 provided on the roof is circulated by the fan 21 to the indoor hollow portion 5 of the wall and floor to warm the wall surface of the building. it can. The indoor side hollow part is connected to the outdoor side hollow part via the humidity adjusting natural plate and the waterproof sheet, so that when the humidity is low, the outdoor side hollow part and the indoor side hollow part are ventilated and the room is comfortable Can be. Moreover, in the summer, the building can be cooled by exhausting the air in the outdoor side hollow portion 4 of the roof to the outside.
[0027]
Furthermore, as shown in FIG. 8, a heat exchanger 22 for heating or cooling the air is provided in the air circulation path, so that the air circulated through the indoor hollow portion 5 can be controlled to a comfortable temperature. . The air in the indoor hollow portion 5 permeates the interior material or passes through the gap between the interior materials and circulates in the room. Moreover, the ventilation duct which can control ventilation volume can be connected between the indoor side hollow part 5 and the room, and air can be circulated between the indoor side hollow part 5 and the room.
[0028]
【The invention's effect】
The building structure of the building of the present invention can realize extremely excellent heat insulation characteristics, can make the indoor environment an ideal comfortable living environment, and can be constructed efficiently using inexpensive heat insulating materials. is there. This is because the housing structure of the present invention provides a humidity adjusting natural plate between the outer wall and the indoor plate, and provides an outdoor side hollow portion and an indoor side hollow portion on both sides of the humidity adjusting natural plate. A waterproof sheet that restricts the passage of water and allows air to pass through is stretched on the surface on the outer wall side of the board, and natural wood that expands and contracts due to the humidity in the air is aligned and fixed to create a ventilation gap to adjust the humidity Natural plate, this humidity adjustment natural plate, when the humidity in the air is low, shrink the natural wood and widen the ventilation gap, and when the humidity in the air is high, expand the natural wood and narrow the ventilation gap, This is because the ventilation between the indoor hollow portion and the outdoor hollow portion is automatically controlled by humidity.
[0029]
That is, the housing structure of the present invention insulates the wall with a double heat insulating structure of the indoor side hollow portion and the outdoor side hollow portion to insulate the wall extremely effectively, and when the humidity of the rainy season is high, Narrow or close the ventilation gap to reduce or block the flow of air between the outdoor side hollow part and the indoor side hollow part, and when the humidity is low, widen the ventilation gap to make the outdoor side hollow part and the indoor side hollow part Because the air circulates in the room, the indoor hollow part can always be kept dry to prevent mold and condensation, and the humidity of the indoor hollow part is automatically adjusted by the humidity in the air. Features that can always be comfortable humidity is also realized.
[0030]
Further, the building structure of the building of the present invention partitions the indoor side hollow portion and the outdoor side hollow portion with a humidity-adjusted natural plate formed by fixing natural wood, so that the outer wall is temporarily burned by an external fire. Even if the heat insulating material provided in the outdoor hollow portion burns to generate harmful gas, the double wall of the humidity adjusting natural plate and the interior material prevents the harmful gas from entering the room. In addition, even if a heat-insulating material such as glass fiber that scatters fine fibers in the outdoor hollow portion is used, the waterproof glass prevents the fine glass fibers that are separated from the heat-insulating material and scattered in the air from entering the room. And the humidity control natural plate and the interior wall with a triple wall will surely prevent it. For this reason, when a fire breaks out, it has the feature which can prevent reliably that glass fiber etc. which are heat insulation materials are scattered indoors, preventing the indoor environment from deteriorating.
[Brief description of the drawings]
FIG. 1 is a horizontal sectional view showing a wall structure which is a building structure of a building according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state in which a part of the wall structure shown in FIG. 1 is removed. Horizontal sectional view showing a wall structure according to another embodiment of the present invention. FIG. 4 is a vertical sectional view of the wall structure shown in FIG. 1. FIG. 5 is a vertical sectional view of a wall structure according to another embodiment of the present invention. 6 is a vertical sectional view showing a floor structure effective for the building of the present invention. FIG. 7 is a vertical sectional view showing a roof structure effective for the building of the present invention. FIG. 8 is a schematic sectional view of the building having the wall structure of the present invention. Figure [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Outer wall 2 ... Indoor plate 3 ... Humidity adjustment natural board 3A ... Natural wood 4 ... Outdoor side hollow part 5 ... Indoor side hollow part 6 ... Waterproof sheet 7 ... Ventilation gap 8 ... Heat insulating material 9 ... Connection protrusion 10 ... Connection groove DESCRIPTION OF SYMBOLS 11 ... Trunk edge 12 ... Holding protrusion 13 ... Longitudinal groove 14 ... Pillar 15 ... Brace 16 ... Base material 17 ... Floor board 18 ... Drum 19 ... Base material 20 ... Roofing material 21 ... Fan 22 ... Heat exchanger

Claims (5)

The wall structure of the building has a humidity adjusting natural plate (3) stretched between the outer wall (1) located on the outdoor side and the indoor plate (2) located on the indoor side of the building, and the outer wall (1) Outdoor side hollow part (4) is provided between the natural plate (3) and the humidity adjustment natural plate (3), and the indoor side hollow connected between the humidity adjustment natural plate (3) and the indoor plate (2) in the room of the building Part (5)
The humidity adjusting natural plate (3) is stretched with a waterproof sheet (6) that restricts the passage of water and allows air to pass through on the outer wall (1) side surface,
In addition, the humidity-adjusted natural board (3) has natural wood (3A) that expands and contracts due to humidity in the air arranged side by side so that a ventilation gap (7) is formed, and natural wood that contracts when the humidity in the air decreases (3A) widens the ventilation gap (7) to facilitate passage of air, and the natural wood (3A) expands when the humidity in the air increases, narrowing the ventilation gap (7) and passing air The building structure of the building that makes it difficult.   The building frame structure according to claim 1, wherein a heat insulating material (8) is disposed in the outdoor hollow portion (4).   The natural wood (3A) of the humidity-adjusted natural plate (3) has a connecting ridge (9) on one side and a connecting groove (10) that guides the connecting ridge (9) on the other side. The building frame structure according to claim 1, wherein the connecting ridge (9) is guided to the connecting groove (10) to connect adjacent natural wood (3A).   The natural wood (3A) of the humidity-adjusted natural plate (3) has a connecting ridge (9) on one side and a connecting groove (10) that guides the connecting ridge (9) on the other side. The connecting ridge (9) is guided to the connecting groove (10) to connect the adjacent natural wood (3A), and the connecting ridge (9) is gradually narrowed toward the tip. The building frame structure according to claim 1, wherein the groove (10) is widened toward the opening. Roof construction of the building, roofing materials located on the weather side (20), and stretched humidity regulating natural plate (3) between the indoor plate (2) located on the interior side of the building, roofing material ( outdoor side hollow part between 20) and humidity control natural plate (3) and (4) is provided, the humidity adjustment natural plate (3) and between the indoor plate (2), chamber that is connected to the indoor of a building The inner hollow part (5) is provided ,
A humidity control natural plate (3) is fixed on the rafter (18), and a waterproof sheet (6) is installed on the top surface of the humidity control natural plate (3) to restrict the passage of water and allow air to pass. Furthermore, a roof base material (19) is fixed on the tarpaulin (6) via the trunk edge (11) on the waterproof sheet (6), and between the base material (19) and the humidity adjusting natural plate (3). to be provided outside the side cavity (4), an outdoor-side hollow portion (4) and a heat insulating material (8) disposed, and fixed roof material (20) on the underlying material (19) ,
In addition, the humidity-adjusted natural board (3) has natural wood (3A) that expands and contracts due to humidity in the air arranged side by side so that a ventilation gap (7) is formed, and natural wood that contracts when the humidity in the air decreases (3A) widens the ventilation gap (7) to facilitate passage of air, and the natural wood (3A) expands when the humidity in the air increases , narrowing the ventilation gap (7) and passing air The building structure of the building that makes it difficult .

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