JP6829589B2 - Insulation structure of the building - Google Patents

Description

The present invention relates to a heat insulating structure of a building, and more particularly to a heat insulating structure of a cabin back and a lower house of a building.

In a building such as a house, energy consumption in heating and cooling can be suppressed (energy saving effect can be obtained) by performing heat insulating construction between indoors (indoors) and outdoors with a heat insulating material. Fiber-based heat insulating materials are often used in the heat insulating construction of the back of the cabin of a building, and the heat insulating material is laid on the back side of the cabin of the ceiling board. Condensation may form on the insulation.

Here, in Cited Document 1, the first moisture-proof film is arranged between the two layers of inorganic fiber mats, and one of the two layers of inorganic fiber mats is covered with the second moisture-proof film. Inorganic fiber-based heat insulating materials are described. In the heat insulating construction using the inorganic fiber-based heat insulating material of Cited Document 1, the inorganic fiber-based heat insulating material is filled with the second moisture-proof film as the indoor side inside the outer wall or the like.

Japanese Unexamined Patent Publication No. 2000-352130

By the way, in the building, a ceiling girder using channel steel or the like is provided in the back of the hut, and the ceiling girder has a reduction hole for reducing the weight while ensuring the desired strength and a hole for passing electrical wiring. There may be through holes such as. If such a ceiling girder is provided, moisture will escape from the through hole, so that the desired moisture-proof performance cannot be obtained, and there is a high possibility that dew condensation will occur between the heat insulating materials and inside the heat insulating material. ..

The present invention has been made in view of the above facts, and an object of the present invention is to provide a heat insulating structure of a building capable of improving the heat insulating performance and moisture-proof performance of the ceiling on the floor.

In order to achieve the above object, the first aspect of the present invention is a girder arranged in the back of a hut of a building and provided with a through hole in a web, a ceiling plate provided under the girder, and fibers. A moisture-proof film is provided on one surface of the bag body filled with the heat insulating material, and the moisture-proof film is directed toward the upper surface of the ceiling plate and spread on the ceiling plate, and the moisture-proof film is spread on the surface of the girder. A first heat insulating material that closes the through hole with the moisture-proof film to surround the girder and a fiber-based heat insulating material are used, and the first heat insulating material is spread on the first heat insulating material. Includes a second insulating material that covers the entire upper surface of the.

In the first aspect, a ceiling plate is provided under the girder. Further, the girder is provided with a through hole in the web, and the through hole reduces the weight while maintaining the desired strength, or is used for wiring electrical wiring. In the first heat insulating material, the bag body is filled with a fiber-based heat insulating material, and a moisture-proof film is provided on one surface of the bag body. Further, as the second heat insulating material, a fiber-based heat insulating material is used, and like the first heat insulating material, a bag body filled with the fiber-based heat insulating material can be applied.

In the first heat insulating material, a moisture-proof film is laid on the ceiling plate toward the ceiling plate, and the moisture-proof film is directed toward the girder side to surround the girder. Further, the first heat insulating material surrounds the girder so that the moisture-proof film comes into contact with the surface of the girder, and the through-hole is closed by the moisture-proof film. The second heat insulating material is spread on the first heat insulating material.

As a result, the first heat insulating material and the second heat insulating material form a two-layer heat insulating structure, and the heat insulating performance is improved. At the same time, the moisture-proof film provided on the first heat insulating material covers the ceiling surface and the surface of the girder, and it is possible to prevent the moisture in the space under the ceiling plate from entering the back of the cabin and causing dew condensation.

On the other hand, the girder protrudes from the heat insulating material laid on the ceiling plate, and when the heat insulating material is placed on the girder, the moisture passing through the through hole provided in the girder is between the heat insulating materials. And there is a possibility that it will get inside the heat insulating material and cause condensation. Here, by surrounding the girder with the first heat insulating material so as to close the through hole of the girder with the moisture-proof film, it is possible to suppress the moisture from passing through the through hole, so that the dew condensation can be suppressed from the first heat insulating material. , The moisture-proof performance is improved.

In the second aspect, in the first aspect, the upper side of the boundary portion of the first heat insulating material adjacent to each other is covered with the second heat insulating material.

In the second aspect, the boundary between the first heat insulating materials is covered with the second heat insulating material. That is, the first heat insulating material is covered with the second heat insulating material so that the boundary portion between the first heat insulating materials and the boundary portion between the second heat insulating materials do not overlap. As a result, heat and moisture can be suppressed from passing through the boundary portion between the first heat insulating materials and the boundary portion between the second heat insulating materials, and the heat insulating performance and the moisture proof property can be improved.

In a third aspect, in the first or second aspect, the second insulation is the existing insulation of the building.

In the third aspect, an existing heat insulating material is used as the second heat insulating material, and the first heat insulating material is superimposed on the second heat insulating material. By using the existing heat insulating material when stacking the heat insulating material in two layers, the heat insulating property can be improved while suppressing the increase in cost. Further, even if the moisture-proof performance of the existing heat insulating material is deteriorated, the moisture-proof performance can be improved by using the first heat insulating material provided with the moisture-proof film.

As described above, according to the first aspect, there is an effect that the heat insulating performance and the moisture proof performance of the ceiling on the upper floor are improved.

According to the second aspect, it has an effect that moisture resistance and heat insulation can be improved. Further, according to the third aspect, there is an effect that desired heat insulating property and moisture proof property can be obtained at low cost.

It is a perspective view of the main part which shows the schematic structure of the building which concerns on this embodiment. It is the schematic sectional drawing which shows the main part of the ceiling which concerns on this Embodiment. It is the same schematic sectional view as FIG. 2 which shows a general ceiling. It is a perspective view which shows the main part of the ceiling girder.

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

The building 10 according to the present embodiment is a unit type house (unit type building). FIG. 1 shows an outline of the building 10 and the unit 12 for the living space forming the building 10 in a perspective view seen from diagonally above.

The building 10 has two floors, and a plurality of units 12 are arranged in the horizontal direction (vertical and horizontal), and the units 12 are vertically and horizontally and vertically and horizontally adjacent to each other by being stacked vertically and vertically (two steps above and below). They are connected to each other. As a result, in the building 10, the first floor (downstairs) portion is formed by the units 12 arranged on the lower side, and the second floor (upstairs) part is formed by the units 12 arranged on the upper side. Further, in the building 10, a sloped roof 14 is formed on the upper part of the units 12 arranged on the floor. As a result, in the building 10, a cabin back 16 is formed above the unit 12 on the upper floor.

The unit 12 is provided with four frame side pillars 18, a ceiling frame 20 is formed above the four frame side pillars 18, and a floor frame 22 is formed below the four frame side pillars 18. Is formed. The ceiling frame 20 is provided with four ceiling girders 24 as girders. The ceiling girder 24 includes a pair of girder ceiling girders 24A and a pair of wife ceiling girders 24B. The ceiling frame 20 is assembled in a rectangular frame shape by rigidly joining the ends of the girder ceiling girder 24A and the end ceiling girder 24B to the joining member 18A above the frame side column 18. Further, in the ceiling frame 20, a plurality of ceiling beams 26, each of which is parallel to the wife ceiling beam 24B, are arranged between the pair of girder ceiling beams 24A, and the ceiling frame 20 is the ceiling beam 26. Each end of the girder ceiling girder 24A is joined to form a substantially ladder shape.

The floor frame 22 has a rectangular frame shape in which the ends of the pair of girder floor girders 28A and the pair of end floor girders 28B are rigidly joined to the joining member 18B below the frame side columns 18. Further, between the girder floor beams 28A of the floor frame 22, a plurality of floor beams 28C, each of which is parallel to the wife floor girder 28B, are arranged, and each end of the floor girder 28C is a girder floor. It is joined to the girder 28A.

The roof 14 is provided on the unit 12 on the upper floor and is connected to the unit 12. As the roof 14, any form such as a gable roof, a hipped roof, and a one-sided roof can be applied.

In the building 10, the inside of the unit 12 is partitioned by a partition wall to form a small room such as a corridor and a storage room, and a plurality of units 12 arranged in the horizontal direction are communicated with each other to form one unit. A living room or the like that is a larger living space than the unit 12 is formed.

In the building 10, the ceiling girder 26 provided in the ceiling frame 20 of the unit 12 is used as the ceiling base, or the ceiling girder 24 (girder ceiling girder 24A, wife ceiling girder 24B) and the field provided under the ceiling girder 26. The ceiling plate 30 is fixed with the edge as the ceiling base, and the ceiling portion 32 is formed. Further, in the building 10, the floor board 34 is laid on the floor base with the floor beam 28C of the floor frame 22 of the unit 12 as the floor base or the joist (not shown) arranged on the floor beam 28C as the floor base. Is formed.

In this building 10, a heat insulating material is provided between the outer wall panel on the outdoor side and the interior panel on the indoor side of the outer wall (not shown). Further, the floor of the building 10 is fixed to the joists by laying a heat insulating material between the joists arranged on the floor frame 22 and stacking a plurality of plate materials (floor boards 34) on the heat insulating material. A known structure can be applied to the heat insulating structure of the outer wall and the floor.

Further, in the building 10, the ceiling portion 32 on the upper floor is heat-insulated. As a result, the building 10 is provided with a heat insulating material over substantially the entire circumference of the interior, and the indoor and outdoor areas are separated by the heat insulating material.

Here, FIG. 2 shows an outline of the ceiling portion 32 of the building 10 to which the heat insulating structure according to the present embodiment is applied in a side sectional view of the building 10. Further, FIG. 3 shows a ceiling to which a general heat insulating structure is applied (hereinafter, referred to as a ceiling portion 32A) in the same cross-sectional view as in FIG. Further, in FIG. 4, the main portion of the ceiling girder 24 (girder ceiling girder 24A or wife ceiling girder 24B) arranged in the back 16 of the cabin is shown in a perspective view.

As shown in FIG. 1, the roof 14 is provided so as to straddle a plurality of units 12 arranged on the upper floor, whereby the cabin back 16 is formed so as to communicate the upper parts of the plurality of units 12. ing. Further, as shown in FIGS. 2 to 4, channel steel (may be light channel steel) is used for the ceiling girder 24 (girder ceiling girder 24A, end ceiling girder 24B) of the unit 12. The channel steel has a substantially C-shaped cross section in which flanges 36B project in one direction from both ends in the width direction of a long flat plate-shaped (strip-shaped) base (web 36A), and the ceiling frame 20 of the unit 12 has a shape of substantially C. , Each flange 36B of the ceiling girder 24 is directed to the inside of the frame. The ceiling girder 24 as a girder will be described by using channel steel, but the girder is not limited to this, and other steel materials such as H-shaped steel or steel materials may be processed.

As a result, as shown in FIGS. 2 to 3, between the units 12 adjacent to each other, the surfaces of the web 36A of the ceiling girder 24 opposite to the flange 36B are opposed to each other with a predetermined interval. (Ceiling girders 24 are opposed back to back). Further, since the unit 12 is fastened and fixed to the adjacent unit 12, the two ceiling girders 24 facing each other back to back are integrated.

Further, in the unit 12, a reduction hole 38 as a through hole is formed in each web 36A of the ceiling girder 24. One or more (two or more) of the reduction holes 38 are formed through the web 36A of the ceiling girder 24 at a predetermined position with a predetermined opening diameter. In FIG. 4, the mitigation hole 38 of one ceiling girder 24 is shown, and the mitigation hole 38 of the other ceiling girder 24 is omitted.

The ceiling girder 24 is reduced in weight while ensuring a predetermined strength (required strength) by providing a reduction hole 38, whereby the unit 12 is lightweight in a state where a predetermined strength and rigidity are secured. Has been made. Further, the mitigation hole 38 provided in the ceiling girder 24 can be used to pass the electrical wiring or the like to be arranged in the cabin back 16 (on the ceiling plate 30).

As shown in FIGS. 2 and 3, the building 10 is defined by a plurality of field edges 40 parallel to one of the girder ceiling girder 24A and the girder ceiling girder 24B (for example, the girder ceiling girder 24A) of the ceiling frame 20. Are arranged at intervals of. The field edge 40 is fixed to the ceiling girder 24 and the ceiling beam 26, and the ceiling plate 30 is fixed to each of the field edges 40. As a result, the ceiling plate 30 divides the cabin back 16 and the living room space 42 such as the living room below the cabin back 16. The living room space 42 is divided not only by a living room formed over a plurality of units 12 but also by an inner wall (not shown) provided on the lower side (or lower side of the ceiling plate 30) of the ceiling girder 24 to store a storage space or the like. Small room is formed.

As shown in FIG. 3, a heat insulating material 44 as a second heat insulating material is used for the ceiling portion 32A. At least a fiber-based heat insulating material is used for the heat insulating material 44, and the heat insulating material 44 is filled with the fiber-based heat insulating material in a bag body 44A having a predetermined size (for example, width 500 mm and length 2500 mm). , It is in the form of a compressible mat. As the fiber-based heat insulating material used for the heat insulating material 44, an inorganic fiber-based heat insulating material such as glass wool or rock wool may be used, and the heat insulating material is not limited to the inorganic fiber-based heat insulating material, but may be a wood fiber-based heat insulating material or the like. Fiber-based heat insulating material may be used.

In the ceiling portion 32A, the heat insulating material 44 is arranged and spread on the ceiling plate 30. Further, in the ceiling portion 32A, the heat insulating material 44 is placed on the ceiling girder 24, and the ceiling girder 24 is covered with the heat insulating material 44. As a result, in the ceiling portion 32A, the ceiling plate 30 and the ceiling girder 24 are covered with the heat insulating material 44 in a plan view seen from above (inside and upper side of the cabin back 16), and the cabin back 16 and the living room space 42 are covered with the heat insulating material 44. It is partitioned by.

On the other hand, the heat insulating material 46 as the first heat insulating material is used for the ceiling portion 32 shown in FIG. The heat insulating material 46 has a compressible matte shape in which a bag body 48 having a predetermined size (for example, a width of about 500 mm and a length of about 2500 mm) is filled with an inorganic fiber-based heat insulating material such as glass wool or rock wool. It is said that. The fiber-based heat insulating material used for the heat insulating material 46 is not limited to the inorganic fiber-based heat insulating material, and other fiber-based heat insulating materials such as wood fiber-based heat insulating materials may be used, but the inorganic fiber-based heat insulating material is used. This makes it possible to reduce costs.

The heat insulating material 46 preferably has a low thermal conductivity, and for example, a heat insulating material 46 having a thermal conductivity λ of 0.065 (W / mK) or less specified in JIS A9521 can be applied, but the heat insulating material 46 is not limited to this.

Further, the heat insulating material 46 is provided with a moisture-proof film 50 on one surface of the bag body 48. The moisture-proof film 50 may be attached to one surface of the bag body 48, or the moisture-proof film 50 may form one surface of the bag body 48.

The moisture-proof film 50, preferably greater than moisture permeation resistance is small is hardly passed through moisture, for example, moisture permeation resistance R which is defined in JIS Z0208 ^{is, 0.082 (m 2 · s ·} Pa / ng) or Moisture-proof performance is applied. As the heat insulating material 46, a material having a thermal conductivity and a moisture permeation resistance that satisfy the heat insulating performance and the moisture permeation performance (moisture prevention performance) required for the ceiling portion 32 is used.

The ceiling portion 32 is laid on the ceiling plate 30 with the moisture-proof film 50 facing the ceiling plate 30 side (lower side). Further, the heat insulating material 46 is brought into contact with the surface of the ceiling girder 24 so as to wrap the ceiling girder 24 with the moisture-proof film 50 directed toward the ceiling girder 24. Further, in the ceiling portion 32, the heat insulating material 44 and the like are spread over the heat insulating material 46. As a result, the ceiling portion 32 has a two-layer heat insulating structure.

Here, as an action of the present embodiment, the building 10 is an existing building having a single-layer heat insulating structure (ceiling portion 32A) using the heat insulating material 44, and the heat insulating structure of the building 10 is renovated into two layers. Explain the construction.

When the heat insulation repair is performed in the existing building 10, the work is performed in the back 16 of the cabin. The ceiling portion 32A provided with the cabin back 16 is often provided with an inspection port (not shown), and when the building 10 is provided with an inspection port, the inspection port enters the cabin back 16 through the inspection port. Work is done. When the building 10 is not provided with an inspection port, a new inspection port may be provided on the ceiling portion 32A, or a part of the ceiling plate 30 such as a storage case may be temporarily removed.

In the work inside the cabin back 16, the existing heat insulating material 44 is first temporarily removed from the ceiling plate 30 to expose the surface of the ceiling plate 30 (the surface on the cabin back 16 side). The heat insulating material 44 temporarily removed from the ceiling plate 30 may be stacked in a space that does not interfere with the laying of the heat insulating material 46.

Next, the heat insulating material 46 carried into the back 16 of the cabin is spread on the ceiling plate 30, and the ceiling girder 24 is surrounded by the heat insulating material 46. The heat insulating material 46 has a bag body 48 filled with a fiber-based heat insulating material and is compressible. Further, in the cabin back 16, the ceiling girders 24 of the units 12 adjacent to each other are opposed to each other back to back.

In the heat insulating material 46, the moisture-proof film 50 is set on the ceiling girder 24 side, and the longitudinal direction is aligned with the longitudinal direction of the ceiling girder 24, and the heat insulating material 46 is hung on the two ceiling girders 24. From this state, the intermediate portion in the width direction of the heat insulating material 46 is pushed between the webs 36A of the ceiling girder 24, and the moisture-proof film 50 of the heat insulating material 46 is closely contacted with the entire upper surface of the ceiling plate 30 between the ceiling girders 24. Let me. As a result, the heat insulating material 46 is filled in a bent state between the two ceiling girders 24, and both sides of the heat insulating material 46 in the width direction cover the upper surface of the flange 36B and come into contact with the upper surface of the flange 36B. .. Further, the moisture-proof film 50 provided on the heat insulating material 46 comes into contact with the surface of the web 36A and closes one opening side of the reduction hole 38 formed in the web 36A of the ceiling girder 24.

Further, with respect to the flange 36B side of the ceiling girder 24, the moisture-proof film 50 side of the heat insulating material 46 is the ceiling girder 24 side, and the end portion of the heat insulating material 46 is the end of the heat insulating material 46 covering the flange 36B. Arrange so that they are in close contact with the part. After that, the heat insulating material 46 is pushed between the pair of flanges 36B. As a result, the heat insulating material 46 is packed between the pair of flanges 36B, the moisture-proof film 50 is in close contact with the surface of the ceiling girder 24 on the flange 36B side, and the reduction holes formed in the web 36A of the ceiling girder 24. The other opening side of 38 is closed.

At the same time, with respect to the upper surface of the ceiling plate 30, the heat insulating material 46 is spread on the ceiling plate 30 with the moisture-proof film 50 side facing the ceiling plate 30 side. At this time, no gap is formed between the heat insulating materials 46 adjacent to each other. Further, the heat insulating material 46 that is surplus on the peripheral edge (eave side) of the cabin back 16 is subjected to processing such as being pushed into the corner portion on the eave side.

As a result, in a state where the moisture-proof film 50 is in close contact with the surface of the ceiling girder 24, the ceiling girder 24 is surrounded by the heat insulating material 46 and is continuously connected to the heat insulating material 46 surrounding the ceiling girder 24 on the ceiling plate 30. The heat insulating material 46 is tightly spread on the ceiling.

In this way, when the heat insulating material 46 is spread on the ceiling plate 30 and the ceiling girder 24 is surrounded by the heat insulating material 46, the entire area of the heat insulating material 46 is covered with the heat insulating material 44. At this time, the heat insulating material 46 surrounding the ceiling girder 24 is covered with the heat insulating material 44, and the heat insulating material 44 is spread so as to cover the heat insulating material 46 covering the ceiling plate 30. Further, when the heat insulating material 46 is covered with the heat insulating material 44, the boundary portion between the heat insulating materials 46 and the boundary portion between the heat insulating materials 44 do not overlap so as to cover the space between the heat insulating materials 46 adjacent to each other by the heat insulating material 44. Arrange the heat insulating materials 44. As a result, the ceiling portion 32 having a heat insulating structure having a two-layer structure of the heat insulating material 46 and the heat insulating material 44 is formed.

In the ceiling portion 32 configured in this way, the upper surface of the ceiling plate 30 is covered with the moisture-proof film 50 provided on the heat insulating material 46, so that the moisture in the living room space 42 is suppressed from entering the cabin back 16. Therefore, it is possible to suppress the formation of dew condensation in the heat insulating materials 46 and 44 and the back of the cabin 16. Further, since the ceiling portion 32 has a two-layer structure of the heat insulating materials 44 and 46, the heat insulating property is improved as compared with the case of the one-layer structure.

Further, when the heat insulating materials 44 and 46 are spread over, the boundary portion between the heat insulating materials 46 and the boundary portion between the heat insulating materials 44 are prevented from overlapping, so that moisture can pass between the heat insulating materials 46. Can be suppressed. As a result, the heat insulating performance of the heat insulating material 46 and the heat insulating material 44 can be maintained, and the moisture resistance can be improved.

Further, since the heat insulating material 46 is bent and inserted between the two ceiling girders 24, the moisture-proof film 50 is brought into close contact with the surface of the web 36A of the ceiling girder 24 by the elastic force of the heat insulating material 46. At the same time, in the ceiling girder 24, the heat insulating material 46 is inserted between the flanges 36B, and the moisture-proof film 50 is in close contact with the surface of the web 36A on the flange 36B side. As a result, the ceiling girder 24 is surrounded by the heat insulating material 46, and the moisture-proof film 50 of the heat insulating material 46 closes the reduction hole 38 of the ceiling girder 24. Therefore, it is possible to prevent the humidity in the living room space 42 from passing through the reduction hole 38 of the ceiling girder 24, and it is possible to prevent dew condensation from forming on the heat insulating material 46 due to the humidity passing through the reduction hole 38.

Moreover, since the heat insulating material 46 provided with the moisture-proof film 50 is used, the moisture-proof and heat-insulating construction can be facilitated and the construction cost can be suppressed. That is, if the moisture-proof film and the heat insulating material are separate, it is necessary to stretch the moisture-proof film on the ceiling plate 30 prior to the work of laying the heat insulating material on the ceiling plate, but the moisture-proof film is provided on one surface of the bag body 48. By using the heat insulating material 46 provided with the film 50, the work of pasting the moisture-proof film becomes unnecessary, so that the man-hours for heat insulating construction can be reduced and the construction cost can be suppressed.

Further, although some of the existing heat insulating materials 44 are provided with a moisture-proof film, it is unclear whether or not the moisture-proof film maintains a desired moisture-proof function in the existing heat insulating material 44, and the heat insulating material 44 is provided. There is a possibility that the moisture-proof film provided on the sill has deteriorated or damaged. Further, some of the heat insulating materials 46 provided with the moisture-proof film 50 are provided with holes on the surface opposite to the moisture-proof film 50. When such a heat insulating material 46 or a heat insulating material 44 is used, even if there is no problem if it is a single layer, there may be a problem in moisture resistance by using two layers. On the other hand, since the heat insulating material 46 provided with the moisture-proof film 50 is arranged on the lower side of the heat insulating material 44 (the ceiling plate 30 and the ceiling girder 24 side), the moisture-proof film 50 of the heat insulating material 46 provides a desired moisture-proofing property. The function can be secured.

Further, when the existing heat insulating material 44 is used, it is considered that the heat insulating property is deteriorated, but by providing the heat insulating material 46, the necessary heat insulating performance can be secured, so that a new heat insulating material is used for both layers. In some cases, the cost of heat insulation construction can be suppressed.

Further, if a moisture-proof film is provided between the heat insulating materials, dew condensation is likely to occur on the lower heat insulating material due to the moisture-proof film, but the moisture-proof film 50 is arranged under the lower heat insulating material 46. Therefore, it is possible to suppress the formation of dew condensation on the heat insulating materials 44 and 46 due to the humidity in the living room space 42.

In the present embodiment described above, the existing heat insulating material 44 provided in the building 10 is used, but a new heat insulating material may be used instead of the heat insulating material 44. Further, in the present embodiment, the existing building 10 has been described as an example, but the present invention is not limited to this, and may be applied to a new building. In these cases, as the heat insulating material used in place of the heat insulating material 44, a heat insulating material obtained by removing the moisture-proof film 50 from the heat insulating material 46 may be applied. Further, as the heat insulating material used in place of the heat insulating material 44, a heat insulating material having an arbitrary structure in which the bag body is filled with the fiber-based heat insulating material material can be used.

Further, in the present embodiment, the heat insulating construction of the cabin back 16 has been described, but the present invention is not limited to the cabin back 16. Some buildings are provided with a shed, but the same heat insulation construction as the back 16 of the shed may be applied to the shed. As a result, in the building, the same heat insulating property and moisture-proof property as the cabin back 16 can be obtained even in the lower house.

10 Building 12 Unit 16 Hut back 20 Ceiling frame 24 Ceiling girder (girder)
30 Ceiling plate 32, 32A Ceiling part 36A Web 38 Mitigation hole (through hole)
44 Insulation (second insulation)
46 Insulation material (first insulation material)
48 Bag body 50 Moisture-proof film

Claims (2)

A girder that is placed behind the hut of the building and has a through hole in the web,
The ceiling board provided under the girder and
A moisture-proof film is provided on one surface of the bag body filled with the fiber-based heat insulating material, and the moisture-proof film is spread on the ceiling plate so as to face the upper surface of the ceiling plate, and the moisture-proof film is spread on the ceiling plate. Upon contact with the surface, the first heat insulating material that closes the through hole with the moisture-proof film and surrounds the girder,
A fiber-based heat insulating material is used, and a second heat insulating material is spread over the first heat insulating material to cover the entire upper surface of the first heat insulating material.
Insulation structure of the building including. The heat insulating structure of a building according to claim 1, wherein the upper side of the boundary portion of the first heat insulating material adjacent to each other is covered with the second heat insulating material.