JPH11324155A - Heat insulating material for house, and execution method for insulating airtight wall, insulating airtight floor, insulating airtight roof, and insulating airtight ceiling using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating material for a house whose length in the short side direction is easily adjusted by compression and entire body is bent and to provide an execution method for a high insulating airtight wall, an insulating airtight floor, an insulating airtight roof, and an insulating airtight ceiling. SOLUTION: A heat insulating material 1 for a house is composed of hard resin foam and a plurality of narrow grooves 6 of the notch depth 1/2-3/4 of the board thickness and the width 1.0-1.5 mm are provided in parallel to the long side of a rectangular board insulating main body 2 and perpendicular to the board face in the both faces of the board except for the both end parts in the short side direction. Besides, a plurality of projection parts 4 of the thickness 5-10 mm are provided in one face of the rectangular board in the long side direction and a slit 5 of the notch depth 1/2-3/4 of the board thickness and the width 1.0-1.5 mm is preferably provided in each of both ends parts in the short side direction. The length in the short side direction of the heat insulating material 1 for the house is pressedly adjusted between a column and a member such as a stud, 2-3 of them are lined and fitted in the long side direction and the interval between the member and the heat insulating material 1 and between the heat insulating materials 1 are airtightly sealed by a sealing material. The heat insulating material 1 may be bent projectingly in the fitted side as necessary and the bent part is corrected to be horizontal by a plate such as a floor slab.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating material for a house and a method for constructing a heat insulating airtight wall, a heat insulating airtight floor, a heat insulating airtight roof, and a heat insulating airtight ceiling using the same.

[0002]

2. Description of the Related Art Recently, highly airtight and highly insulated houses capable of reducing energy costs for cooling and heating have been constructed. In a highly airtight and highly insulated house, it is necessary to fit heat insulating material into the wall, floor, and ceiling that define the boundary between the living space and the outside without any gap. Glass wool is generally used as the heat insulating material, and an airtight sheet made of polyethylene or the like is generally used as the airtight material. When the heat insulating material is applied to the boundary, for example, the wall surface, the heat insulating material is fitted between the pillar, the stud, and the horizontal member, and the periphery is sealed with an airtight sheet.

According to this construction method, it is difficult to fit the glass wool into the space constituting the boundary with no gap and uniform thickness from the shape of the glass wool, and the heat insulation becomes insufficient. In addition, the construction of the airtight sheet is particularly difficult at the corners, and the airtightness becomes insufficient.

[0004] Further, after the application, the outside of the airtight sheet may condense during cooling. Since glass wool easily absorbs moisture, the condensed moisture is absorbed and retained by the glass wool, thereby causing adverse effects such as corrosion of members constituting the boundary.

As an improved product of the glass wool heat insulating material, a rigid foamed resin molded into a rectangular plate shape is used.
Such a molded product needs to be adjusted in width and length depending on the size of the space constituting the boundary. Actual Kaihei 2-1
In the molded heat insulating material 60 described in 3617, as shown in FIG. 9A, a plurality of narrow grooves 61 and 62 extend perpendicularly to the plate surface near both ends in the short side direction. 2)
As shown in (2), the width in the short side direction is compression-adjusted in the vicinity of both ends, a heat insulating material is fitted in a predetermined gap between members such as columns and studs, and the members are hermetically closed with the heat insulating material.

[0006]

When a heat insulating material made of glass wool is used, it is difficult to fit the heat insulating material without any gap between the members, resulting in insufficient heat insulation. Insufficient airtightness at corners such as the joints between the two. In addition, the conventional molded heat insulating material has a narrow groove only in the vicinity of both ends, so that the bending direction cannot be freely adjusted and does not bend as a whole. There is a problem that it is difficult to adjust the length and it is difficult to insert between the members.

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat insulating material for a house in which the length in the short side direction can be easily adjusted by compression and which is curved over the whole.
An object of the present invention is to provide a method for airtightly installing an insulated airtight wall, an insulated airtight floor, an insulated airtight roof, and an insulated airtight ceiling with an enhanced heat insulating effect.

[0008]

SUMMARY OF THE INVENTION The present invention provides a rectangular plate made of a hard foamed resin, having a cutting depth of 1/2 to 3/3 of the plate thickness, perpendicular to the plate surface. 4, width 1.0
It is a heat insulating material for houses characterized in that a plurality of narrow grooves of up to 1.5 mm are provided on both sides of a plate except for both ends in the short side direction.

According to the present invention, since the narrow grooves are provided from both sides of the plate-shaped heat insulating material except for both ends in the short side direction of the plate surface, the narrow grooves can be provided at intervals and the short side can be provided. Even if the length of the short side direction is compressed from both sides in the direction, it is difficult to break at the narrow groove, just insert the heat insulating material between members equal to or slightly smaller than the width of the heat insulating material, and the heat insulating material spreads to every corner and enforces Cutting work in the long side direction can be omitted on site. Further, the plate-shaped heat insulating material can be curved in an arbitrary direction. Thereby, the plate-shaped heat insulating material can be inserted in a convex manner on the insertion side, and the convex portion can be pressed by the plate material to airtightly close the members. In addition, the length of the heat insulating material is set to 1/2 to 1/3 of the interval between the members such as the horizontal members for easy handling. The gap between the materials is closed with a sealing material or the like. The present inventor has confirmed through experiments that the above range is optimal for the depth and width of the narrow groove.

In the present invention, a plurality of convex portions having a thickness of 5 to 10 mm are provided on one surface of the rectangular plate in parallel with the long side direction, and the narrow grooves are provided in portions having no convex portions. It is characterized by.

According to the present invention, a plurality of projections having a thickness of 5 to 10 mm are provided on one surface of the plate-shaped heat insulating material in parallel with the long side direction. In this way, when using a heat insulating material for a wall surface or a roof, an air layer can be secured between the outer wall plate and the base plate, the moisture generated between the outer wall plate and the heat insulating material is discharged, and the base plate and the heat insulating material are used. During this time, the heated air can be exhausted.

The protruding portion has a thickness of 5 μm on a foamed resin formed in a plate shape.
A plate of the same material of an appropriate size of 10 to 10 mm is formed by bonding with an adhesive, and a narrow groove is formed by pressing a heated nichrome wire or the like against a plate-like foamed resin, so that a narrow portion is formed on a convex portion. It is preferable that no groove is provided, and therefore, the convex portions are generally provided in a row at both ends in the short side direction and the central portion.

Further, according to the present invention, the rectangular plate-shaped body has a cut depth at both ends in the short side direction parallel to the long side at right angles to the plate surface and the depth is 1/2 to 3 / th of the plate thickness. 4, width is 1.0 ~
A single 1.5 mm slit is provided.

According to the present invention, since the slit having the same shape as the narrow groove is provided at both ends in the short side direction, the plate-like heat insulating material can be further compressed by the slit width, and the insertion of the plate-like heat insulating material becomes easy. When the interval between members such as pillars and studs is short, the plate-like heat insulating material can be easily cut at the position of the slit.

Further, according to the present invention, the heat insulating material according to any one of claims 1 to 3 is provided between the lateral members to which the outer wall plate is attached and between the pillars so that one surface is on the outer wall plate side. Two or three pieces are fitted in the up and down direction so that a sealing material is injected into a gap between the heat insulating material and the upper and lower transverse members and a gap between the heat insulating materials to be air-tightly closed. A method for constructing a heat-insulated airtight wall, wherein a material is attached to a pillar and a stud.

According to the present invention, the width of the heat insulating material is substantially equal to the distance between the columns and the studs, and the length is approximately 1/2 to 1 of the distance between the horizontal members.
/ 3, and the heat insulating material is strongly pressed into the gap between the heat insulating material and the pillar and the stud, and is fitted without any gap. The gap between the heat insulating material and the horizontal member and the space between the heat insulating materials are filled with a sealing material such as urethane. Therefore, airtightness can be easily secured without an airtight sheet, and heat from the outer wall plate is efficiently shut off. The space between the heat insulating material and the inner wall material can be used as a ventilation air passage. In particular, if the heat insulating material of claim 2 is used, a ventilation layer is formed between the outer wall plate and the heat insulating material, and even if moisture is generated between the outer wall and the heat insulating material, the moisture is diffused through the ventilation layer. It does not dew inside and does not impair the durability of the building. Since the thickness of the heat insulating material is thinner than the thickness of the pillar, an air passage is formed between the heat insulating material and the inner wall, and the ventilation is used by utilizing the air passage disclosed in Japanese Patent Application Laid-Open No. Hei 9-159205. The system can be realized.

Further, according to the present invention, a holding member is attached to a large-scale or joist, and the heat-insulating material according to claim 1 or 3 is horizontally or upwardly protruded with one surface facing down. Characterized in that a sealing material is injected into the gap between the heat insulating material and the large-scale or joist and the gap between the heat-insulating materials to seal air-tightly, and a floor plate is attached to the large-scale or joist. This is the floor construction method.

According to the present invention, a holding member is provided on the large or joist to hold the plate-shaped heat insulating material horizontally.
Then, the plate-shaped heat insulating material is curved so as to be horizontal or convex upward and is inserted in the direction of the large pull or the joist, and the heat insulating material is strongly pressed between the large pull or the joist and is fitted without a gap. Further, the gap between the heat insulating materials is hermetically closed by the sealing material. The protruding portion of the plate-shaped heat insulating material is pressed horizontally by the floor plate, and there is no gap between the floor plate and the plate-shaped heat insulating material.

Further, according to the present invention, the heat insulating material according to any one of claims 1 to 3 is fitted between the timber attached to the field plywood with one surface facing upward, and the gap between the heat insulating material and the timber and the heat insulating material are mutually interposed. A sealing material is injected into a gap of the airtight seal and airtightly closed.

According to the present invention, the heat insulating material is strongly pressed between the rafters and can be fitted without any gap. In addition, since the gap between the heat insulating materials is air-tightly closed by the seal material, an air-tight roof having a good heat insulating effect can be formed. In particular, when the heat insulating material of claim 2 is used, an air passage is formed between the field plywood and the heat insulating material, and particularly in summer, the air between the field plywood and the field plywood side of the heat insulating material is exhausted by the ventilation building.

According to the present invention, the heat insulating material according to claim 1 or 3 is fitted between the ceiling joists attached to the ceiling plywood so that one surface thereof faces upward or along the ceiling so as to protrude upward. This is a method for constructing a heat-insulated airtight ceiling, characterized by injecting a sealing material into a gap between a material and a ceiling joist and a gap between heat insulating materials to airtightly close the gap.

According to the present invention, the plate-like heat insulating material is curved along the shape of the ceiling or convexly upward and inserted between the ceiling joists, and the heat insulating material is strongly pressed between the ceiling joists.
Fit without gap. Further, the gap between the heat insulating materials is hermetically closed by the sealing material. The protruding portion of the plate-shaped heat insulating material is pressed by the ceiling plywood along the shape of the ceiling, so that there is no gap between the ceiling plywood and the plate-shaped heat insulating material.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to embodiments. FIG. 1 is a plan view of a residential heat insulating material 1 according to an embodiment of the present invention as viewed from one surface side, and FIG. 2 is a side view as viewed from a short side direction. Insulation material 1
Is a convex in which several rows (three rows in the present embodiment) of a 10 mm-thick foamed polystyrene plate are adhered to one surface 3 of a heat insulating material body 2 in which a hard foamed resin such as expanded polystyrene is formed in a plate shape. And a width of 1.0 to 1.5 mm at both ends of one surface of the main body 2.
A slit 5 having a thickness of 5 mm and a depth of 板 of the plate thickness is provided. In addition, between the projections 4, a width of 1.0 from both sides of the main body 2 is set.
A plurality of narrow grooves 6 each having a thickness of ｍｍ mm and a depth of の of the plate thickness are provided (a total of 12 on each surface in the present embodiment, a total of 12). The slit 5 and the narrow groove 6 are parallel to the longitudinal direction of the main body 1. When the main body 1 is pressed in the short side direction indicated by the arrow 7, the narrow groove 6 is pressed, and in the present embodiment, the maximum is about 6 mm.
The width in the short side direction becomes narrow. When one of the surfaces is pressed, the pressed side is compressed, and the other side is in a state where the narrow groove is opened, and the side is curved. In particular, when one of the surfaces 3 on which the slit 5 is provided is pressed, the surface is further curved.

As another embodiment of the present invention, a heat insulating material for a house without the convex portion 4 is used.

FIG. 3 shows a heat insulating wall 1 using the heat insulating material 1 of the present invention.
FIG. 4 is a cross-sectional view of FIG.
FIG. 4 is a front view of a state (before mounting). The base 13 is placed on the foundation 12 and fixed to the foundation with anchor bolts (not shown). Pillars 14 and studs 15 are erected on the base 13, and an eaves (in the case of a one-story building) or a trunk (when there is a second floor) 16 are provided thereon. Base 13 which is horizontal material
An outer wall plate 17 made of structural plywood is attached to the eaves or the eaves (in the case of the first floor), or the eaves and eaves (in the case of the second floor), and the pillars 14, the studs 15, and the horizontal members 13,
The housing heat insulating material 1 is fitted into the space surrounded by 16. Since the distance between the pillar 14 and the stud 15 is about 45 cm in the general construction method, the width of the heat insulating material 1 of the present invention is slightly larger than 45 cm, and the length of the heat insulating material 1 is ,
It is made 1/2 or 1/3 of the 16 intervals. And
Two sides or three sides are pressed vertically as shown by the arrow 7 in FIG. 2 and two or three pieces are vertically arranged and inserted. The gaps 13a and 16a between the heat insulating material 1 and the transverse members 13 and 16 and the gaps 1a and 1b
Is hermetically closed with a sealing material. The heat insulating material 1 is provided with a convex portion 4 so that the convex portion 4 hits the inside of the outer wall plate 17. The thickness of the heat insulating material 1 is the base 13, the eaves 16, and the pillars 14.
And the thickness of the stud 15 (the thickness in the horizontal direction in FIG. 3). In this state, the inner wall member 18 is attached to the pillar 14 and the stud 15. Thereby, a ventilation layer 19 is formed between the heat insulating material 1 and the outer wall material 17, and an air passage 20 is formed between the heat insulating material 1 and the inner wall material 18.

FIG. 5 is a sectional view of a heat insulating floor 21 using the heat insulating material 1 of the present invention. A stone 22 is placed on the land, and a floor 23 is erected thereon. A joist 25 is provided on the large-drawing 24 at a right angle to the large-drawing 24 and is fastened to the large-drawing 24 with a nail or the like. An L-shaped holding member 26 is attached to the joist 25, and the heat insulating material 1 is fitted between the joists 25. Since the interval between the joists 25 is generally set to about 45 cm, the heat insulating material 1 is pressed in the direction of the arrow 7 in FIG. The gap between the heat insulating material 1 and the joist 25 and the space between the heat insulating materials 1 are air-tightly closed with a sealing material, and the floor plate 27 is placed thereon with the joist 2.
Attach to 5 with nails. When the heat insulating material 1 is convex upward, the heat insulating material 1 is pressed by the floor plate 27, and the width direction of the heat insulating material 1 and the joist 2
Close the gap between 5 and hermetically. Insulation material 1 used for insulation floor 21
Has no convex part 4 on one surface 3.

FIG. 6 is a sectional view showing the structure of the roof 30 and the ceiling 40. The roof 30 generally includes a purlin 31 and an eaves 16, a rafter 34 provided on these at right angles thereto, a field board 35 stretched on a rafter,
And a waterproof member such as a tile (not shown) on the field board 35. The ceiling 40 is roughly spanned by a hut beam 41 extending between the eaves 16, a ceiling joist 42 provided at right angles to the hut beam 41, and a field edge 43 suspended from the ceiling joist 42. It is composed of a ceiling plate 44, a ceiling plywood 45 stretched on a ceiling joist 42, and a shed 46 connecting the purlin 31 and the shed 41. And these members
It is fastened with fastening members such as nails and hardware.

FIG. 7 is a sectional view of the insulated roof 30 taken along section line VII-VII in FIG. A field ground plywood 35 is attached to the rafter 34, and a plurality of heat insulating materials 1 are vertically arranged between the rafters 34, with the convex portions 4 facing upward, and a gap between the rafter 34 and the heat insulating material 1 and a mutual insulation material 1 are provided. The gap is hermetically closed by the sealing material. Thereby, an air passage 37 is secured between the field plywood 35 and the heat insulating material 1.

In the insulated ceiling 40, as shown in FIG. 6, the insulating material 1 is horizontal (in the case of an inclined ceiling, the inclination along the inclination of the ceiling, the same applies hereinafter) or curved upwardly between the ceiling joists 42. In a state, a plurality of them are vertically arranged and fitted, and the ceiling joists 42
The gap between the heat insulating material and the gap between the heat insulating materials 1 are airtightly closed by the sealing material, and the ceiling plywood 45 is attached to the ceiling joist 42 with nails or the like. When the heat insulating material 1 is curved convexly upward, the heat insulating material 1 is pressed by the ceiling plywood 45 so as to be horizontal. It is assumed that the heat insulating material 1 used for the heat insulating ceiling 40 has no convex portion 4.

A filler such as urethane resin is preferably used as a sealing material for closing the gap between each member and the heat insulating material 1 and the gap between the heat insulating materials 1.

FIG. 8 is a cross-sectional view schematically showing the flow of air in a hermetically insulated house. If floor insulation is used, insulation floor 2
1 indicates that the floorboard 27 is in close contact with the heat insulating material 1 and thus the floorboard 2
The description of 7 is omitted. Roof 30 or ceiling 40
It is sufficient if either one of them has a heat insulating structure.
Both have a heat insulating structure. In the case where the underfloor space 64 having an airtight structure is provided, fresh air is sent from the air supply port 51 through the heat exchange air unit 52 to the air passage through the underfloor space 64, and in the winter, The heating unit 53 provided in the underfloor space 64 is operated. Air contaminated in the living space 50 is discharged from a non-living space 54 such as a corridor or a toilet through an exhaust port 55 via a heat exchange air unit 52. In this way, the ventilation of the hermetically sealed house is performed. In FIG. 8, the floor 21 has a heat-insulating structure and the underfloor space 64 has a heat-insulating structure.

The heat insulating wall 11 is made of an outer wall plate 1 which is a structural plywood.
Preferably, a ventilation layer 19 is also provided between the heat insulating material 7 and the heat insulating material 1, and the gas permeable layer 19 is used for discharging moisture generated on the outer surface of the heat insulating material 1. In the wet method, the outer wall plate 1
The outside of 7 is finished with a permeable mortar. In the dry method, outside the outer wall panel 17 and further through the vertical rim, the wall panel 6 is removed.
0, and a ventilation layer 61 is provided between the outer wall plate 17 and the wall plate 60. When the wall plate 60 is heated by solar heat or the like, a draft is generated in the ventilation layer 61, and the heated air flows from the ventilation layer 61 to the attic. It enters 62 and is discharged from the ventilation building 63 to the outside.

In the case where the roof 30 has a heat insulating structure, when the field plywood 35 is heated by the solar heat via the waterproof member, a draft is generated in the air passage 37 between the field plywood 35 and the heat insulating material 1, and this air passage 37 is formed. Through the ventilation building 63 to the outside. When the ceiling 40 has a heat insulating structure, air is supplied to the attic 62 from the ventilation holes 65 provided in the eaves plate in the wet method, and the ventilation layer 61 and the ventilation holes 6 in the dry method.
5, air is supplied from the ventilation ridge 63 and discharged from the ventilation building 63 to the outside, whereby ventilation of the attic 62 is performed.

[0034]

According to the heat insulating material for housing according to the present invention, a plurality of narrow grooves are provided from both sides of the plate parallel to the long side and perpendicular to the plate surface, so that the length in the short side direction can be easily compressed. Yes, fine adjustment of the dimensions between members such as pillars and studs can be easily made to fit between the members. In addition, it is possible to freely bend in any direction. After being fitted between the members, the bend can be corrected by a plate material mounted thereon. As a result, airtightness is maintained by the elasticity of the heat insulating material itself and the filling of the sheet material,
As a result, an airtight sheet is not required, and the process is simplified.

In the heat insulating member for a house according to the present invention, since a convex portion is provided on one surface, a uniform ventilation layer can be formed between the outer wall and the heat insulating material, and the moisture in the wall can be discharged and the heat insulating layer can be formed. A further effect can be obtained. In addition, an air passage is formed by the relationship between the thickness of the heat insulating material and the thickness of the pillars and studs, and the ventilation and heating system disclosed in Japanese Patent Application Laid-Open No. Hei 9-159205 can be realized.

In the heat insulating member for a house according to the present invention, the slits wider than one narrow groove are provided at both ends in the short side direction, so that the heat insulating material can be easily bent at the slit position. Can be cut.

The heat insulating material for a house according to the present invention can be conveniently used for a heat-insulating wall, a heat-insulating floor, a heat-insulating air-tight roof, and a heat-insulating air-tight ceiling, so that the heat insulating efficiency of a heat-insulating air-tight house can be further improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a heat insulating material for a house 1 according to an embodiment of the present invention.

FIG. 2 is a side view of the heat insulating material for a house 1 in a short side direction.

FIG. 3 is a cross-sectional view of an example of the heat-insulated airtight wall 11 formed by the construction method of the present invention.

FIG. 4 is a side view before the inner wall 18 of the heat insulating wall 11 is attached.

FIG. 5 is a cross-sectional view of an example of the heat-insulated airtight floor 21 formed by the construction method of the present invention.

FIG. 6 is a sectional view showing a schematic configuration of a roof 30 and a ceiling 40.

FIG. 7 is an insulated hermetic roof 30 formed by the construction method of the present invention.
It is sectional drawing of an example.

FIG. 8 is a cross-sectional view showing the flow of air in a heat-insulated house.

FIG. 9 is a side view of a prior art residential insulation material 60.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation material for houses 2 Insulation material main body 4 Convex part 5 Slit 6 Narrow groove 11 Insulated and airtight wall 14 Column 15 Stud 17 Outer wall plate 18 Inner wall plate 21 Insulated and airtight floor 24 Large-scale 25 Joist 27 Floor plate 30 Insulated and airtight roof 34 Taruki 35 Noji Plywood 40 Insulated airtight ceiling 41 Shed bar 42 Ceiling joists 43 Field edge 44 Ceiling board 45 Ceiling plywood 50 Living space 62 Above the ceiling 64 Underfloor space

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Wataru Maeda Osaka Gas Housing Equipment Co., Ltd. 3-6-114 Bingo-cho, Chuo-ku, Osaka-shi, Osaka

Claims (7)

[Claims] 1. A cut depth of 1/2 to 3/4 of a plate thickness and a width of 1.0 to 1.0 mm, parallel to the long side of a rectangular plate made of hard foamed resin and perpendicular to the plate surface. A heat insulating material for a house, wherein a plurality of 1.5 mm narrow grooves are provided on both sides of a plate except for both ends in the short side direction. 2. The rectangular plate-like body having a thickness of 5 to 5 on one surface.
2. The heat insulating material for a house according to claim 1, wherein a plurality of 10 mm convex portions are provided in parallel with the long side direction, and the narrow groove is provided on a portion having no convex portion. 3. A cut depth at one end of the rectangular plate-like body at both ends in the short side direction, parallel to the long side, at right angles to the plate surface, the depth is 1/2 to 3/4 of the plate thickness, and the width. 3. The heat insulating material for houses according to claim 1 or 2, wherein one slit of 1.0 to 1.5 mm is provided. 4. The heat insulating material according to claim 1, between the horizontal member to which the outer wall plate is attached, and between the pillars so that one surface is on the outer wall plate side. Two or three pieces are fitted in the up and down direction, and a sealing material is injected into the gap between the heat insulating material and the upper and lower horizontal members and the gap between the heat insulating materials so as to be air-tightly closed. A method of constructing a heat-insulated airtight wall, wherein the wall is attached to a stud and a stud. 5. A holding member is attached to a large or joist.
The heat insulating material according to claim 1 or 3 is held by a holding member between a large-scale pull or a joist so that one side faces downward or horizontally or upwardly, and a gap between the heat-insulating material and the large pull or a joist is provided. A method for constructing an insulated airtight floor, characterized by injecting a sealing material into a gap between heat insulating materials to airtightly close the space and attaching a floor panel to a large or joist. 6. The heat insulating material according to claim 1, which is inserted between the woods attached to the field ground plywood, with one surface facing up, into a gap between the heat insulating material and the wood and a gap between the heat insulating materials. A method for constructing a heat-insulated airtight roof, characterized by injecting a sealing material and sealing the airtight. 7. The heat insulating material according to claim 1 or 3 is fitted between the ceiling joists attached to the ceiling plywood so that one surface of the heat insulating material faces upward or along the ceiling or becomes convex. A method of constructing a heat-insulated airtight ceiling, characterized by injecting a sealing material into a gap between joists and a gap between heat insulating materials so as to be airtightly closed.