JP2008150946A - Heat insulation structure of building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulation structure of a building wherein a heat insulation material of an arbitrary thickness can be used, heat insulation performance as designed in the initial stage can be demonstrated without any damage on the heat insulation section installed and the heat insulation performance can be maintained for a long time. <P>SOLUTION: The heat insulation structure 10 comprises an outer substrate 32, an inner substrate 37 and a heat insulation material D installed between the outer substrate 32 and the inner substrate 37. The outer substrate 32 and the inner substrate 37 are installed at arbitrary positions independent from a column H. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat insulating structure of a building, and more particularly to a heat insulating structure of a building that can greatly improve a heat insulating effect and can suitably maintain a heat insulating material for a long period of time.

Our daily life has continued to increase the burden on the global environment. In particular, global warming has begun to appear in our daily lives in the form of submerged land due to rising sea levels, changes in the habitat of animals and plants, and the emergence of unprecedented giant hurricanes.
In recent years, the Kyoto Protocol has come into effect, and we are required to live more in consideration of the global environment. The Kyoto Protocol regulates carbon dioxide emissions, but when complying with the Kyoto Protocol, efforts must be made to reduce carbon dioxide emissions not only in industry but also in general households. As a specific measure in ordinary households, it is conceivable to live in a house with good cooling and heating efficiency. In such a house, the quality of the heat insulation structure is very important.

  A general heat insulating structure in a conventional wooden building is formed by providing a hollow portion on a roof, a wall, a floor or the like and filling the hollow portion with a heat insulating material. Specifically, the base material of the inner wall and the base material of the outer wall are attached between the pillar and the pillar, and the moisture-proof sheet is attached to the inner surface of the base material of the inner wall and the base material of the outer wall, and then surrounded by the moisture-proof sheet and the pillar. This space is filled with heat insulating material.

In order to improve the heat insulating performance in a building, it is important to reliably fill the heat insulating material and to maintain the filled state of the heat insulating material suitably over a long period of time. As a method for filling such a heat insulating material, for example, there is a technique disclosed in Patent Document 1. According to the method for filling a heat insulating material described in Patent Document 1, the heat insulating material can be filled in a dense state, and the subsidence of the heat insulating material is suitably suppressed even when vibration is applied to the building after the heat insulating material is filled. Therefore, it is possible to suitably maintain the heat insulating performance of the building.
JP-A-11-166271

According to the construction method of the heat insulating material described in Patent Document 1, the space partitioned between the partition and the panel is filled with the heat insulating material without any gap, and the construction is performed so as not to cause a change in the filled state of the heat insulating material even when vibration is applied. This is a useful technique in maintaining a good thermal insulation structure.
However, in a wooden building to which the technique described in Patent Document 1 is applied, the space for filling the heat insulating material is limited to a range delimited by the pillar and the interior / exterior base material, and therefore the increase in the filling thickness of the heat insulating material. However, there is a limit, and it may not be possible to ensure the required thickness of the insulation. In such a case, a heat insulating material formed in a panel shape may be additionally provided on the outdoor side, but there is a limit to the thickness of the panel-like heat insulating material that can be provided on the outdoor side, which is still sufficient. There is a problem that a satisfactory heat insulation structure cannot be obtained.

  Moreover, in the construction method in patent document 1, finishing materials, such as wallpaper, are directly attached to the indoor panel. By the way, equipment such as a power outlet is often provided on the indoor side wall surface of the building. Since such equipment, such as a power outlet, is disposed within the wall thickness, when the power outlet is disposed on the wall surface, the filled heat insulating material must be hollowed out. Furthermore, even the dehumidifying sheet that protects the heat insulating material is damaged. As described above, in a place where equipment such as a power outlet is disposed, there is a problem that even if the heat insulating material is filled under favorable conditions, a decrease in heat insulating performance cannot be avoided.

Therefore, the present invention provides a heat insulating structure for a building that can significantly reduce carbon dioxide emissions by increasing the heat insulating efficiency of the building and can provide a comfortable living environment. Is the first purpose.
In addition, even when electrical construction work is performed after the insulation material is installed, the insulation material part is not damaged, and the insulation performance as originally designed can be exhibited. A second object is to provide a heat insulating structure for a building capable of maintaining performance over a long period of time.

In order to achieve the above object, the present invention has the following configuration.
That is, the present invention provides a heat insulating structure for a building in which an outer base material and an inner base material are disposed, and a heat insulating material is disposed between the outer base material and the inner base material. The material is a heat insulating structure of a building, which is arranged at an arbitrary position independent of a pillar.

Further, an intermediate wall is provided between the outer base material and the inner base material, and the heat insulating material is disposed between the outer base material and the intermediate wall.
Thereby, even when the arrangement positions of the outer base material and the inner base material are limited, the thickness of the heat insulating material to be provided can be set to an arbitrary thickness.

In addition, the inner base material is disposed at a required interval from the intermediate wall, and an air circulation layer is formed between the intermediate wall and the inner base material.
As a result, the heat insulation performance of the indoor space can be greatly improved, the temperature of the indoor space can be easily adjusted, and it can also be used as an efficient ventilation path.

Further, a moisture-proof sheet is laid between the heat insulating material and the air circulation layer.
Thereby, since it is possible to prevent the moisture-proof sheet for preventing the heat insulating material from being dampened, it is possible to suppress the deterioration of the heat insulating material due to the dampening.

Further, the air circulation layer is characterized in that the air flowing through the air circulation layer is provided so as to be circulated in the building, starting from an underfloor portion.
The air circulation layer is formed only on the wall portion, and one end side of the air circulation layer communicates with the lower floor portion and the other end side communicates with the indoor space.
By these, by always circulating the air which distribute | circulates the inside of an air circulation layer, retention of cold air or warm air can be prevented. Moreover, if the air circulated in the air circulation layer is subjected to heat exchange using an underfloor portion having a constant annual temperature or a solar heat storage device, the air circulated in the air circulation layer according to the season is set to suitable conditions. be able to. Furthermore, fresh air can be supplied indoors, enabling a healthy life.

According to the present invention, since the outer base material and the inner base material forming the space for arranging the heat insulating material are independent of the pillar, the heat insulating material arranging space having an arbitrary width dimension is formed at an arbitrary position. be able to. Thereby, the arrangement | positioning thickness of a heat insulating material can be adjusted freely.
In addition, even when electrical work is performed after installing the insulation material, the insulation material part does not require any processing. It can be demonstrated reliably.
Furthermore, since there is an air circulation layer on the indoor side of the heat insulating material, the temperature in the room can be easily adjusted. This makes it possible to achieve a higher level of consideration for the global environment and more comfortable living than conventional heat insulation structures.

  Embodiments of a heat insulating structure for a building according to the present invention will be described below with reference to the drawings.

(First embodiment)
Drawing 1 is an explanatory view showing the outline of the building to which the heat insulation structure in a 1st embodiment is applied. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a sectional view taken along line BB in FIG.
The building 10 according to the present embodiment has a general configuration including a foundation B, a roof 20, a wall body 30, a floor 60, and a ceiling 70, but is characterized by a heat insulating structure of the wall body 30 and the ceiling 70. is doing.

First, the wall body 30 will be described.
The wall body 30 in the present embodiment includes an outer wall portion 30A and an inner wall portion 30B, and a heat insulating material D is filled between the outer wall portion 30A and the inner wall portion 30B. Air circulation layers 50A and 50B are formed on the outer wall portion 30A and the inner wall portion 30B, respectively.

The outer wall portion 30 </ b> A has a required interval on the outer surface of the outer base material 32 and the outer base material 32 that is an exterior base material disposed between the plurality of columns and the interposition columns H, MH, H, MH,. .. And the exterior material 33 attached to the piers S1, S1,...
The inner wall portion 30B includes an intermediate wall 35 serving as an inner heat insulating material base material arranged in parallel at a predetermined interval on the indoor side of the outer base material 32, and an intermediate wall spacer CMH for holding the intermediate wall 35. A moisture-proof sheet 36 affixed to the indoor-side surface of the intermediate wall 35, and piers S2, S2,... Fixed to the intermediate wall 35 across the vertical direction with a required interval on the surface of the moisture-proof sheet 36; It is attached to the piers S <b> 2, S <b> 2,... And is composed of an inner base material 37 serving as an inner base material and an inner material 38 attached to the inner base material 37.

  The intermediate wall 35 is fixed to an intermediate wall pillar CMH that is erected in parallel with the pillars H, H. The intermediate wall spacer CMH is independent of the pillar H and is fixed to a base, a girder, a beam or the like. The outdoor side end surface position of the intermediate wall inter-column CMH is disposed so as to be located on the indoor side with respect to the indoor side end surface position of the column H. The arrangement position of the intermediate wall 35 is defined by the intermediate wall spacers CMH arranged in this way, and the filling width in the wall thickness direction of the heat insulating material D arranged on the wall body 30 can be set. Since the intermediate wall 35 is disposed independently of the column H, it can be disposed at an arbitrary position, and the filling thickness of the heat insulating material D can be freely set.

In the outer wall portion 30 </ b> A, an outdoor air circulation layer 50 </ b> A is formed by a pier S <b> 1 disposed between the exterior material 33 and the outer base material 32. In the inner wall portion 30 </ b> B, an indoor air circulation layer 50 </ b> B is formed by the pier S <b> 2 disposed between the intermediate wall 35 and the inner base material 37. The lower end portion of the air circulation layer 50B of the inner wall portion 30B communicates with the underfloor space 90, and the upper end portion communicates with the air circulation layer 80 formed on the ceiling 70. A heat insulating material D is filled between the outer base material 32 and the intermediate wall 35. Therefore, the wall body 30 is formed in a heat insulating structure in which the heat insulating material D is sandwiched between the outdoor and indoor air circulation layers 50A and 50B. Thereby, the heat insulation effect can be further improved.
In the present embodiment, a sponge-like heat insulating material D is used.

Next, the ceiling 70 will be described.
It comprises a girder K having a basic frame structure, a heat insulating material D, a heat insulating material holding portion 72 for holding the heat insulating material, a ceiling interior material base 74 and a ceiling interior material 76.
The heat insulating material holding part 72 includes heat insulating material holding frame members 72a and 72b suspended from a hanging member (not shown) attached to the girder K, and heat insulating materials attached to the heat insulating material holding frame materials 72a and 72b. It is comprised by the receiving plate 72c. The heat insulating material holding frame materials 72a and 72b are formed in a lattice shape, and a heat insulating material receiving plate 72c is attached to the indoor side surface (lower surface). A moisture-proof sheet 78 is attached to the indoor side surface (lower surface) of the heat insulating material receiving plate 72c with an adhesive tape or the like.

  A heat insulating material D is filled between the upper surface of the heat insulating material receiving plate 72c and the upper surface of the girder K. Since the arrangement position of the heat insulating material receiving plate 72c can also be set freely, the installation thickness of the heat insulating material D arranged on the ceiling 70 can also be set freely. The heat insulating material D arranged on the heat insulating material receiving plate 72c is not necessarily limited to the arrangement thickness in the present embodiment, and the heat insulating material D is arranged to the upper surface height position of the beam K. In addition to the case where the installation height is not satisfied, the heat insulating material D may be disposed at a position higher than the upper surface height position of the girder K. Moreover, the sponge-like heat insulating material D is used for the heat insulating material D of the ceiling 70 in the present embodiment.

  A crosspiece S3 is attached to the lower surface of the moisture-proof sheet 78 with a required interval. A ceiling interior material base 74 is attached to the lower surface of the pier S3, and a ceiling interior material 76 is attached to the lower surface of the ceiling interior material base 74. The space surrounded by the piers S3, S3,..., The moisture-proof sheet 78 and the ceiling interior material base 74 becomes an air circulation layer 80, and both ends of the air circulation layer 80 are indoor air circulation formed in the wall body 30. Each communicates with the layer 50B.

  As described above, the indoor air circulation layer 50B of the wall 30 and the air circulation layer 80 of the ceiling 70 are communicated with each other, whereby the living space can be covered with the air circulation layers 50B and 80. If the underfloor space 90 has a semi-underground structure, the temperature of the air flowing through the air circulation layers 50 </ b> B and 80 can be adjusted in the underfloor space 90. As a result, cooled air can be obtained in summer. Furthermore, if a heat storage device using solar heat as a heat source is arranged in the underfloor space 90, heated air can be circulated through the air circulation layers 50B and 80 in winter, and a comfortable temperature can be set throughout the seasons. Become.

Furthermore, it is more preferable to arrange an air conditioner in the underfloor space 90 because the temperature in the living space can be adjusted more finely.
When these structures are employed, it is preferable to dispose a heat insulating material D2 on one or both of the outer surface and the inner surface of the foundation B in order to insulate the temperature of the underfloor space 90 from the outside air temperature. .

  In addition, since the air circulation layers 50B and 80 are formed on the wall 30 and the ceiling 70 on the indoor side from the heat insulating material D, the air circulation layer 50B is used when performing facility work such as electrical work and piping work. , 80 can be used as piping / wiring (or either) space. Accordingly, the heat insulating material D disposed on the wall body 30 and the ceiling 70 is not lost, and the moisture-proof sheets 36 and 78 that protect the heat insulating material D are not damaged. Can be maintained.

(Second Embodiment)
FIG. 4 is an explanatory view of the structure of the connecting portion between the wall portion and the ceiling of the heat insulating structure of the building in the second embodiment.
In the present embodiment, an air circulation layer is not formed on the ceiling 70. The wall 30 is formed with air circulation layers 50 </ b> A and 50 </ b> B as in the first embodiment, and the lower end of the indoor air circulation layer 50 </ b> B communicates with the underfloor space 90.
The upper end of the indoor air circulation layer 50B is not connected to the ceiling 70 and is open to the indoor space. The air that has circulated from the underfloor space 90 through the indoor air circulation layer 50 </ b> B flows into the indoor space from the indoor upper end of the wall 30. By adopting such a configuration, the temperature of the air in the indoor space can be directly adjusted, so that the temperature adjustment can be performed very quickly.

(Third embodiment)
Drawing 5 is a figure which looked up at the ceiling from the living space side among the heat insulation structures of the building in a 3rd embodiment.
The ceiling 70 in the present embodiment is characterized by the structure of the ceiling interior material base 74. Specifically, a plurality of frame structures 74a are formed on the indoor side surface of the heat insulating material receiving plate 72c, and the ceiling interior material base 74 is formed by arranging each frame structure 74a in a matrix. . If the ceiling interior material 76 is attached to such a ceiling interior material base 74, the air circulation layer 80 formed on the ceiling 70 is formed in the vertical direction and the horizontal direction, and all the wall bodies 30 connected to the end sides of the ceiling 70. It is possible to communicate with the indoor air circulation layer 50B. As a result, the amount of air circulated through the air circulation layers 50B and 80 can be significantly increased, and the temperature of the indoor space can be easily adjusted.
The frame structure 74a is preferably attached to the heat insulating material receiving plate 72c in advance.

(Fourth embodiment)
FIG. 6 is an explanatory diagram showing an outline of a building to which the heat insulating structure in the fourth embodiment is applied.
The present embodiment is characterized in that the solar heat utilization device 22 using solar heat as a heat source is used to heat the air circulated through the air circulation layers 50B and 80. In the present embodiment, an outer heat insulating material D3 is provided in order to further enhance the heat insulating effect of the building. A panel-like heat insulating material is suitably used for the outer heat insulating material D3. The air heat-exchanged by the solar heat utilization device 22 disposed in the so-called attic portion is supplied to the underfloor space 90 through the heated air circulation pipe 24 disposed in the air circulation layer 50 </ b> B of the wall surface 30. The outer heat insulating material D3 may not be provided in some cases.

According to the present embodiment, the air warmed by the solar heat utilization device 22 in the attic portion is supplied to the underfloor space 90 through the heated air circulation pipe 24, and then the floor 60, the wall surface is raised by the rise of the heated air. 30 and after adjusting the temperature of the living space through the air circulation layers respectively formed on the ceiling 70 portion, it is warmed again by the solar heat utilization device 22 and circulates in this path. As described above, since solar heat with zero load on the global environment can be used efficiently, a comfortable living space can be provided without adding load to the global environment in combination with the heat insulating structure 10 according to the present invention. can do.
Although not shown, it is preferable to provide a heat insulating material on the outer peripheral surface of the heated air circulation pipe 24. Furthermore, if a blower fan is provided in the path of the solar heat utilization device 22 or the heated air circulation pipe 24, the air in the air circulation layer circulates without stagnation, so that it is possible to warm the air efficiently. .

(Fifth embodiment)
In the present embodiment, as shown in FIG. 7, fresh air is taken from outside and is distributed to the air circulation layers 50 </ b> B and 80. This embodiment can be said to be a modification of the second embodiment.
In the present embodiment, the heat exchanger 100 is disposed in the space between the roof 20 and the ceiling, the temperature of the outside air taken in from the outdoor air intake pipe 102 is adjusted by the heat exchanger 100, and then temporarily placed in the underfloor space 90. It is made to flow in and distribute | circulates from the underfloor space 90 to the floor 60 and the air circulation layer (50B) of a wall surface. The air supplied to the air circulation layer 50 </ b> B flows into the living space from the indoor inflow communication portion 106, then the indoor air is discharged from the outdoor discharge communication portion 108, and is discharged outside through the indoor air discharge pipe 104. It is.

In the present embodiment, a heat exchange type ventilation fan is used as the heat exchanger 100. The heat exchanger 100 uses the heat of the warm (or cold) indoor air taken in from the outdoor exhaust communication section 108 to warm (or cool) the outdoor air taken in by the outdoor air intake pipe 102. It can be supplied to the living space from the indoor inflow communicating portion 106.
According to the present embodiment, it is advantageous because fresh air whose temperature is adjusted so as to be always close to the room temperature of the living space can be taken into the living space.

  Further, the heat exchanger 100 is not limited to the heat exchange type exhaust fan, and is, for example, a heat exchanger 100 using fossil fuel in addition to a solar heat source as shown in FIG. Also good. In the case of the heat exchanger 100 using fossil fuel, it is more convenient to arrange in the underfloor space than the arrangement position shown in FIG. 7 because the heat generated by fuel consumption can be used efficiently.

(Sixth embodiment)
FIG. 8 is an explanatory diagram showing an outline of a building to which the heat insulating structure in the sixth embodiment is applied.
The heat insulation structure 10 of the building in this embodiment shows an example using a solar thermal system as heating in a living space. In the present embodiment, the heat insulation material D covers the living space and the ceiling portion to block the temperature from the outside.
A pipeline P for circulating a heat medium (for example, an antifreeze liquid) between the solar heat collecting section 200 disposed on the roof 20 and the heat radiating section 210 and the hot water supply section 220 disposed in the underfloor space 90. Is arranged.

  The antifreeze liquid heated in the solar heat collecting section 200 is sent to the heat radiating section 210 in the underfloor space 90 through the pipeline P. The antifreeze liquid passes through the heat radiating section 210 and releases heat stored in the antifreeze liquid to the underfloor space 90. The heat released in the underfloor space 90 heats the air in the underfloor space 90, generates an upward air flow, circulates in the air circulation layers 50B and 80, and adjusts the temperature in the living space.

  Further, as shown in FIG. 8, if the inner surface portion of the underfloor space 90 is made of concrete BC, the heat storage action of the concrete BC can be used, and the temperature of the entire underfloor space 90 can be heated. In addition, if the heat is stored while sufficient solar heat is obtained, the heat stored in the concrete BC is released even when it is difficult to obtain solar heat. It is convenient because it can.

Furthermore, a switching valve (not shown) is disposed between the heat radiating unit 210 and the hot water supply unit 220 so that the antifreeze liquid can also flow through the hot water supply unit 220. The switching valve is controlled to open and close by the control means. The control means controls the opening / closing operation of the switching valve (on / off of the switching valve or the opening of the switching valve) according to temperature conditions such as a temperature difference between the outdoor temperature and the indoor temperature in addition to the outdoor temperature. When the control means opens the switching valve, the antifreeze liquid flows into the hot water supply unit 220, and the heat stored in the antifreeze liquid can be used as a heat source for the hot water supply unit 220. In the present embodiment, one or both of heating and hot water supply using solar heat can be appropriately utilized.
Thus, in this Embodiment, the heating and hot-water supply equipment using the solar heat which is free infinite energy can be constructed | assembled.

As mentioned above, although the heat insulation structure of the building concerning this invention has been demonstrated in detail based on embodiment, this invention is not limited to the above embodiment, In the range which does not deviate from the main point of invention. It goes without saying that even if various modifications are made, they belong to the technical scope of the present invention.
For example, the moisture-proof sheets 36 and 78 for protecting the heat insulating material D are not directly in contact with the heat insulating material D in addition to the form in which the moisture barrier sheets 36 and 78 are disposed so as to be in direct contact with the heat insulating material D on the intermediate wall 35 or the heat insulating material receiving plate 72c. Thus, any form of the form which is arranged on the indoor side of the intermediate wall 35 or the heat insulating material receiving plate 72c may be used. In addition, when the thickness of the heat insulating material D is sufficiently large, the moisture-proof sheets 36 and 78 may not be provided.

  In the embodiment described above, the air circulation layer 50B is necessarily formed on the wall 30 on the indoor side, but the air circulation layer 50B on the indoor side is not necessarily formed. When the indoor air circulation layer 50B is not formed, the intermediate wall 35 is not necessary, and the inner base material 37 may be attached directly to the intermediate wall spacer CMH. In this case, there is no space for electrical work or the like, but the thickness of the heat insulating material D to be initially provided is previously equal to the thickness of the heat insulating material D that is lost due to the equipment work. It is possible to cope with the initial problem by adding it and ensuring that the moisture-proof sheet 36 is cured.

Further, in the above embodiment, the outer base material 32 and the inner base material 37 forming the heat insulating material disposing space are respectively disposed so as to have a so-called inner heat insulating structure. The inner base material 37 may be disposed outside the column H so as to have a so-called outer heat insulating structure. According to this, even if it is an outer heat insulation structure, since the arrangement | positioning thickness of a heat insulating material can be set to arbitrary thickness, it is suitable.
Furthermore, since a sponge-like heat insulating material can be used even when the outer heat insulating structure is adopted, the installation thickness of the heat insulating material can be greatly increased, and the heat insulating performance can be greatly improved.

  Needless to say, in addition to the embodiments described above, all of the above embodiments may be combined.

It is explanatory drawing which shows the outline of the building to which the heat insulation structure in 1st Embodiment is applied. It is sectional drawing in the AA line in FIG. It is sectional drawing in the BB line in FIG. It is structure explanatory drawing of the connection part of the wall part and ceiling of the heat insulation structure of the building in 2nd Embodiment. It is the figure which looked up at the ceiling from the living space side among the heat insulation structures of the building in 3rd Embodiment. It is explanatory drawing which shows the outline of the building to which the heat insulation structure in 4th Embodiment is applied. It is explanatory drawing which shows the outline of the building to which the heat insulation structure in 5th Embodiment is applied. It is explanatory drawing which shows the outline of the building to which the heat insulation structure in 6th Embodiment is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Building 20 Roof 22 Solar heat utilization apparatus 24 Heated air distribution pipe 30 Wall body 30A Outer wall part 30B Inner wall part 32 Outer base material (exterior base material)
33 Exterior material 35 Intermediate wall (internal heat insulation base material)
36, 78 Moisture-proof sheet 37 Inner base material (interior base material)
38 Interior material 50A, 50B, 80 Air distribution layer 60 Floor 70 Ceiling 72 Heat insulating material holding part 74 Ceiling interior material base 76 Ceiling interior material 90 Underfloor space 100 Heat exchanger 102 Outdoor air intake pipe 104 Indoor air discharge pipe 106 Indoor inflow Communication part 108 outdoor outflow communication part 200 solar heat collecting part 210 heat radiating part 220 hot water supply part B foundation BC concrete C covering materials D, D2, D3 heat insulating material H pillar K girder MH space pillar P pipelines S1, S2, S3

Claims (6)

In the heat insulating structure of the building in which an outer base material and an inner base material are arranged, and a heat insulating material is arranged between the outer base material and the inner base material,
The heat insulating structure for a building, wherein the outer base material and the inner base material are arranged at arbitrary positions independent of the pillars. An intermediate wall is provided between the outer base material and the inner base material,
The heat insulating structure for a building according to claim 1, wherein the heat insulating material is disposed between the outer base material and the intermediate wall.   The said inner base material is arrange | positioned with the said intermediate | middle wall, and required space | interval, The air circulation layer is formed between the said intermediate wall and the said inner base material. Building insulation structure.   The heat insulating structure for a building according to claim 3, wherein a moisture-proof sheet is laid between the heat insulating material and the air circulation layer.   The heat insulation structure for a building according to claim 3 or 4, wherein the air circulation layer is provided such that air flowing through the air circulation layer is circulated in the building, starting from an underfloor portion.   5. The building according to claim 3, wherein the air circulation layer is formed only on a wall portion, and one end side of the air circulation layer communicates with an underfloor portion and the other end side communicates with an indoor space. Thermal insulation structure.

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