JP2003096940A - Heat insulating structure of exterior wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating structure of an exterior wall capable of improving a heat insulation property by decreasing the ratio of a heat bridge when the heat of the exterior wall of a house is insulated, simplifying the air- tightness treatment in a connecting section of a thermal insulating material and, at the same time, decreasing the heating influence on a gap occurring in the connecting section of the thermal insulating material. SOLUTION: For the heat insulating structure of the exterior wall consisting of an ALC panel 1 (concrete slab), a spacer 3 is placed between the ALC panel 1 and a heat insulating plate 4 consisting of a phenol resin foam to ensure an air space 6. The spacer 3 is formed of the phenol resin foam, and the spacer 3 is placed by corresponding to a joint of the heat insulating plate 4. The spacer 3 is placed between a column 1 for constituting a skeleton and the ALC panel 1, the end face of the heat insulating plate 4 is opposed to a column 12 and, at the same time, the end is connected to the spacer 3. The end of the heat insulating plate 4 is connected to the column 12 with an air-tight tape 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating structure for an outer wall formed by connecting a plurality of concrete slabs in succession, and particularly to heat insulating an outer wall capable of ensuring an air layer between a lightweight cellular concrete slab and a heat insulating plate. It is about structure.

[0002]

2. Description of the Related Art In recent homes, a lightweight aerated concrete slab (ALC panel) is used to form an outer wall and
There is a heat insulating structure in which a heat insulating material is arranged on the inner surface of the LC panel. Although many structures have been proposed as a heat insulating structure for a house in which an ALC panel constitutes an outer wall, generally, wood is attached to the inner surface of the ALC panel and a space formed between the wood is filled with a heat insulating material. After applying a moistureproof film on the indoor side of this heat insulating material, gypsum board,
It is configured by attaching an inner wall material such as a cloth.

[0003]

In the above heat insulating structure, the continuity of the heat insulating material is interrupted by the wood, and the heat insulating performance of the wood is inferior to that of the heat insulating material, resulting in discontinuous heat insulating performance. There is a problem in that the heat insulation performance as a whole is poor. In this case, it is possible to make a thermal improvement by reducing the proportion of wood.

However, in order to make it possible to ignore the gap that affects the airtightness of the heat insulating material divided by the wood, it is necessary to perform an enormous tape treatment along the gap or to install an airtight sheet. Therefore, when constructing the airtight sheet, a base for fixing the sheet end portion is further required. These also lead to problems such as longer construction periods and higher costs.

The object of the present invention is to reduce the proportion of heat bridges made of wood as much as possible to improve the heat insulation performance, simplify the airtight treatment at the connection portion of the heat insulation material, and connect the heat insulation material. Another object of the present invention is to provide a heat insulating structure for an outer wall that can reduce the thermal influence of the gap generated in the portion.

[0006]

In order to solve the above problems, the heat insulating structure of the outer wall according to the present invention is a heat insulating structure of an outer wall made of a concrete slab, and a heat insulating plate made of a concrete slab and a phenol resin foam. It is characterized in that a thin plate is arranged between them to secure an air layer.

In the above heat insulating structure, by disposing the thin plate between the concrete slab and the heat insulating plate made of the phenol resin foam, it is possible to secure an air layer corresponding to the thickness of the thin plate. Therefore, the air layer can improve the heat insulating effect and the air layer can promote the breathing of the concrete slab.

In the above heat insulating structure, it is preferable that the thin plate is made of a phenol resin foam, and the thin plate is arranged corresponding to the joint of the heat insulating plate made of the phenol resin foam.

As described above, by forming the thin plate arranged between the concrete plate and the heat insulating plate by the phenol resin foam, it is possible to perform adiabatic reinforcement of the gap that may occur at the connecting portion of the heat insulating plate. . Further, since the thin plate is arranged corresponding to the joint of the heat insulating plate, the airtightness at the joint of the heat insulating plate can be secured by the thin plate.

Another heat insulating structure according to the present invention is a heat insulating structure of an outer wall made of a concrete slab, in which a thin plate made of a phenol resin foam is arranged between a structural member constituting a skeleton and the concrete slab, and An end face of a heat insulating plate made of a phenol resin foam is opposed to the structural member, and the heat insulating plate is fixed to the concrete slab through the thin plate.

In the above heat insulating structure, when there is a structural member including columns and beams that form the frame, a thin plate in which the end surface of the heat insulating plate is opposed to the structural member and the end portion is arranged between the structural member and the concrete slab By fixing to the concrete slab via the heat insulating plate and the thin plate having heat insulating properties, the heat insulating plate and the thin plate having a heat insulating property are arranged to bypass the structural member and are fixed to the ALC panel.
Therefore, the structural member does not become a thermal bridge, and the heat insulating property is not impaired.

In the above heat insulating structure, the end portion of the heat insulating plate made of a phenol resin foam which is arranged with the end faces facing the structural member may be connected to the structural member by an airtight material having airtightness. preferable. In this way, by connecting the structural member and the end of the heat insulating plate with the airtight material,
High airtightness can be imparted to both connection parts, and airtightness as well as heat insulation performance can be secured.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the heat insulating structure for the outer wall will be described below. The heat insulation structure of the outer wall according to the present invention relates to the heat insulation structure of the outer wall formed by arranging a plurality of concrete slabs in parallel, in which a thin plate is arranged on the indoor side of the concrete slab and the thin plate is made of a phenol resin foam. By installing, the air layer is secured between the concrete slab and the heat insulating plate, and by this, the concrete slab is configured to ensure a space for repeated moisture absorption and moisture release and to exhibit preferable heat insulation performance. It is a thing.

Further, at a portion where the heat insulating plate intersects with the structural member including the pillars and beams forming the frame, a thin plate is arranged between the structural member and the concrete slab so that the end surface of the heat insulating plate faces the structural member and the heat is insulated. By fixing the ends of the plate to the concrete slab through the thin plate, the heat insulating plate is arranged around the structural member, and these structural members prevent the structural member from acting as a thermal bridge, which is preferable. It is designed to exhibit heat insulation performance.

Further, at the portion where the heat insulating plate intersects with the structural member, the end surface of the heat insulating plate is opposed to the structural member, and both are connected by an airtight material having airtightness so that the structural member and the heat insulating plate are connected. It is designed to ensure airtightness at the connection site.

As the concrete slab, it is possible to selectively use a panel such as a lightweight aerated concrete (ALC) panel or a precast (PC) panel which is generally used in residential construction.

Each of the above-mentioned panels has its own characteristics.
The C panel can be preferably used because it is lightweight and has high heat insulation performance. Especially ALC on the outer wall
By using a panel and forming an air layer on the indoor side, it is possible to exhibit high heat insulation performance. Further, by forming an air layer on the indoor side of the ALC panel, it is possible to prevent the resonance transmission phenomenon, and there is also an effect that the sound absorbing performance is improved.

The above phenol resin foam has been developed by the applicant of the present invention and has already been applied for an international application (Japanese Patent Application No. 2000-558).
158) (Neomafoam (registered trademark)). This phenolic resin foam can be preferably used as a heat insulating plate.

The phenolic resin foam according to the above technology is
And the phenol resin base portion, density of 10kg / m ³ ~100kg / m ³ and a bubble portion formed from a large number of fine bubbles
Phenol foam of (1), wherein the fine bubbles contain hydrocarbons and the average bubble diameter is in the range of 5 μm to 200 μm, and most of the fine bubbles have a smooth bubble resin wall surface. And, even though the foaming agent is a hydrocarbon, it has thermal conductivity comparable to that of the conventional CFC-based foaming agent, and the thermal conductivity does not change with time, and the mechanical strength such as compressive strength is improved. Excellent and brittleness is improved.

In the present invention, the heat insulating plate provided on the indoor side of the concrete slab with the air layer separated is made of a phenol resin foam, has a high heat insulating property, and maintains the heat insulating property and dimensions for a long period of time. It has possible properties. The heat insulation of the phenolic resin foam has a bubble diameter of 5 μm to 200 μm.
m, preferably as small as 10 μm to 150 μm,
In addition, it can be ensured by keeping the closed cell ratio as high as 80% or more. In addition, the phenolic resin foam has high flame resistance, and when a flame acts,
The surface is carbonized so that it does not ignite.

For example, if the density of the phenol resin foam is 2
When set to 7 kg / m ³ , the thermal conductivity at 20 ° C is 0.020 W / m · K and the compressive strength is 15 N / c.
The m ² and heat distortion temperature are 200 ° C. Regarding the performance of the phenol resin foam, the extruded polystyrene foam has three types of thermal conductivity: 0.028 W / mK, compressive strength: 20 N / cm ² ,
Heat distortion temperature: 80 ° C, two kinds of rigid urethane foam have thermal conductivity: 0.024 W / mK, compressive strength;
8N / cm ² , heat distortion temperature; sufficiently high performance as compared with 100 ° C.

Therefore, a heat insulating plate made of a phenol resin foam can exhibit substantially the same heat insulating performance with a thickness of about 2/3 that of conventional extruded polystyrene foam or rigid urethane foam.

A protective layer is usually provided on the front and back surfaces of the phenol resin foam. The material forming the protective layer is not particularly limited, but it is possible to use, for example, a nonwoven fabric made of synthetic fibers including a polyester nonwoven fabric.

The thickness of the heat insulating plate is set at the manufacturing stage, and the width and length are cut to desired values. That is, the width of the heat insulating plate can be set according to the module size set in the applicable house, and the length can be set correspondingly to the module size and the height of one floor. Is.

For this reason, when the length of the heat insulating plate is cut corresponding to the height of one floor, the work for attaching the heat insulating plate to the concrete slab can be easily performed, and the supporting portion for the concrete slab can be performed. The air-tightness can be easily maintained because the number of connecting portions of the heat insulating plate is reduced.

In particular, since the phenol resin foam has a relatively high compressive strength, it can sufficiently retain its shape as a heat insulating plate even when it is mounted at a height of one floor. Further, the non-woven fabric arranged on the front and back surfaces and integrated with the foam functions as a resistance member against bending, shearing or pulling, and it is possible to configure a heat insulating structure having high thermal and strength reliability. .

The thin plate has a function as a spacer when the heat insulating plate is attached to the indoor surface of the concrete slab, and has a function of ensuring an air layer when the heat insulating plate is attached to the concrete slab.

The thin plate having the above functions is not particularly limited in thickness, material and shape. As a thin plate,
It is sufficient that the breathing of the concrete slab, that is, the concrete slab can secure an air layer having a thickness capable of absorbing the moisture or releasing the absorbed moisture.
The thickness of such an air layer is preferably about 7 mm or more. Therefore, a thin plate having a thickness of about 7 mm is used.

When the heat insulating plate is attached to the concrete slab, the thin plate is interposed between the two and the screw penetrates. Therefore, it is not preferable that the thin plate is compressed and its thickness is changed when the heat insulating plate is attached to the concrete slab, and it is necessary that the thin plate has an appropriate compressive strength. The material for such a thin plate is preferably a phenol resin foam having the same density as that of the heat insulating plate.

Generally, a phenol resin foam has a relatively large spherical or irregular void inside, which causes the compressive strength to decrease. Therefore, conventionally, the thin plate was easily affected by voids and was difficult to handle in construction. However, the neomafoam described above has a feature that the total total area of voids is 5% or less of the total area, and the variation in compressive strength is small. Therefore, even if it is a thin plate with a thickness of 10 mm or less,
It is easy to handle, and it can be applied to a thin plate which has a function as the above-mentioned spacer and which needs an appropriate compressive strength.

The thin plate (hereinafter referred to as "spacer") is
It is arranged corresponding to the seam of the heat insulating plate. By arranging the spacers so as to correspond to the joints of the heat insulating plate, it is possible to substantially cover the joints of the heat insulating plate with the spacers of the same material, and it is possible to make up for the loss of heat insulation. Furthermore,
The airtightness can be secured by performing the airtight treatment.

The width of the spacer having the above function is
A sufficient contact area can be secured to the ends of the heat insulating plate on both sides of the seam so that the heat insulating defect at the seam of the heat insulating plate can be compensated and the heat insulating plate can be easily fixed to the concrete plate with screws. It is preferably dimensioned.

When fixing the heat insulating plate to the concrete slab through the spacer, it is not always necessary to use screws,
It is possible to adopt means such as adhesion with an adhesive or adhesion with a double-sided tape. That is, by using a phenol resin foam having a protective layer formed on the front and back surfaces as the spacer and the heat insulating plate, the protective layer can be used as an adhesive medium, and the concrete plate and the spacer can be bonded together. It is also possible to fix the heat insulating plate to the concrete slab through the spacer by adhering the heat insulating plate to the spacer.

Further, even when the heat insulating plate is fixed to the concrete slab by using the screw, it is not always necessary to directly fix the heat insulating plate by directly driving the screw, and the heat insulating plate is fixed at a predetermined height and laterally. It is also possible to fix it via a crosspiece arranged transversely to the direction. In this case, the crosspiece is fixed to the concrete slab by screws through the spacer and the heat insulating plate.

The spacers arranged at the joints of the heat insulating plate may be formed in a convex shape in cross section, and the convex portions may be inserted and fixed in the joints of the heat insulating plate. That is, the spacer (thin plate) is
It does not necessarily have to be a flat plate, and may be formed in a convex shape or another shape. Further, in order to ensure airtightness, the joint of the heat insulating plate may be closed by two flat plates. In this case, of the two flat plates, the flat plate arranged on the concrete plate side functions as a spacer, and the flat plate arranged indoors functions as a material for ensuring airtightness. Further, a material having a convex cross section may be arranged on the indoor side, a spacer made of a flat plate may be arranged between the material and the concrete slab, and the convex portion of the material may be inserted into the joint of the heat insulating plate. .

As structural members constituting the skeleton, there are columns made of square pipes, beams made of H-shaped steel, and the like. In the present invention, the structural members are not limited to pillars and beams, but all the members constituting the building frame are targeted. The site of the structural member that connects the heat insulating plate is not particularly limited, but the side surface of the square pipe that forms the column and the H that forms the beam.
It is generally a flanged surface of shaped steel.

As the airtight material used for connecting the structural member constituting the skeleton and the heat insulating plate, any material can be used as long as it can maintain the airtightness and connect them. As such an airtight material, a packing material having elasticity and airtightness, which is attached to a position where a heat insulating plate in a structural member is to be connected, by an adhesive agent, a metal film or a synthetic resin film having airtightness There is an airtight tape having an adhesive or a pressure sensitive adhesive applied to one surface thereof, and each can be selectively used.

When the end faces of the heat insulating material are made to face the structural member and the end portions are connected by the airtight tape, the protective layers provided on the front and back surfaces of the phenol resin foam constituting the heat insulating plate should have good adhesiveness. Is preferred. In this way, since the protective layer has adhesiveness, the airtight tape having adhesiveness is used to reliably connect the adjacent heat insulating plates or the heat insulating plate and the pillars or beams constituting the structural member. It is possible to

Further, when the ends of the two heat insulating plates arranged corresponding to the spacers are connected to each other, the airtight tape is attached to the interior side of the seam to close the joint, so that higher airtightness can be exhibited. Is. Therefore, the continuous heat insulating plate can exhibit the heat insulating performance and the airtight performance.

Preferred examples of the heat insulating structure for the outer wall according to the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view for explaining the heat insulating structure of the outer wall of the house. FIG. 2 is a plan sectional view for explaining the heat insulating structure of the outer wall. FIG. 3 is a plan sectional view including columns for explaining the heat insulating structure of the outer wall. In this embodiment, an ALC panel is used as a concrete slab that constitutes the outer wall.

In FIGS. 1 and 2, the ALC panel 1 is attached to a beam 2 which constitutes the skeleton of a building through a mounting metal fitting (not shown). Various structures for attaching the ALC panel 1 to the beam 2 have been proposed, and these known structures can be appropriately selected and used.

A spacer 3 made of phenol resin foam is attached to the indoor side surface of the ALC panel 1, and a heat insulating plate 4 made of phenol resin foam is attached to the spacer 3. The heat insulating plate 4 has a width corresponding to the module size set in the target house, and a length corresponding to the height of one floor. In particular, the meaning that the length corresponds to the height of one floor does not mean that the length is the same as the height of one floor, but the height of the indoor of one floor, that is, the beam 2 from the surface of the floor panel 5. It has a dimension substantially equal to the distance to the lower flange 2a.

Since the spacer 3 having a relatively large compressive strength is interposed between the ALC panel 1 and the heat insulating plate 4, the thickness of the spacer 3 does not change when the heat insulating plate 4 is fixed with the screw 7. An air layer 6 having a stable width dimension is formed between the ALC panel 1 and the heat insulating plate 4. The air layer 6 can smoothly dissipate and absorb the moisture of the ALC panel 1, and can secure a heat insulating layer by the air layer 6.

In this embodiment, when fixing the heat insulating plate 4 with the screw 7, the mounting metal fitting 9 for mounting the base 8 of the wall on the indoor side is fixed at the same time. However, it is not limited whether the heat insulating plate 4 and the mounting bracket 9 are fixed with one screw 7 or another means as described above, and the structure for fixing the base 8 of the wall on the indoor side is fixed. The most rational means should be selected in relation to.

The width of the spacer 3 is sufficient for the ends of the heat insulating plate 4 on both sides of the seam so that the airtightness at the seam of the heat insulating plate 4 can be secured and the fixing by the screw 7 can be easily performed. The contact area is secured. Therefore, the seam of the heat insulating plate 4 does not serve as a heat bridge with the ALC panel 1 forming the outer wall, and the airtightness with respect to the air layer 6 can be secured. For this reason, it becomes possible to prevent loss of heat insulation.

In particular, by attaching an airtight tape 13 having airtightness to the indoor side of the seam of the heat insulating plate 4 formed corresponding to the spacer 3 to close the seam, a high airtightness is given to this seam. It is possible to Therefore, even if the heat insulating plate 4 is not pressed against the spacer 3 with a high force by the screw 7, the airtightness can be surely exhibited.

As shown in FIG. 3, the position of the base 8 of the indoor wall is generally regulated by the indoor surface 12a of the pillar 12 constituting the frame. On the other hand, as described above, the heat insulating plate 4 made of a phenol resin foam has higher heat insulating performance than the conventional heat insulating material. Therefore, the wall base material 10 such as a plaster board attached to the base 8 of the wall on the indoor side
A space 11 is formed between the heat insulating plate 4 and the heat insulating plate 4, and it is possible to use the space 11 for electrical wiring and piping on the indoor side.

Further, at the portion where the heat insulating plate 4 intersects the pillar 12,
The heat insulating plate 4 is fixed to the ALC panel 1 via the spacer 3 in a state where the end surface of the heat insulating plate 4 faces the side surface 12b of the pillar 12, and the spacer 3 is inserted into the gap formed between the ALC panel 1 and the pillar 12. Therefore, regardless of the presence or absence of the pillars 12, the spacers 3 are arranged and fixed at a predetermined interval on the indoor surface of the ALC panel 1, and the heat insulating plate 4 separates the air layer 6 between the spacers 3. To face each other.

That is, the end surface of the heat insulating plate 4 faces the side surface 12b of the column 12, and the end surface abuts on the surface of the spacer 3,
The heat insulating plate 4 is fixed to the ALC panel 1 through the spacer 3 by the screw 7 that is driven in from the indoor side.

As described above, when fixing the heat insulating plate 4 to the ALC panel 1 via the spacer 3, it is not always necessary to use the screw 7, and it is also possible to fix it using an adhesive or a double-sided tape. It is possible. It is also possible to arrange a crosspiece (not shown) on the surface of the heat insulating plate 4 on the indoor side and fix the crosspiece using the crosspiece. In particular, when a crosspiece is used, this crosspiece can also be used as a mounting base for a faucet box or the like.

Therefore, by covering the indoor side surface of the ALC panel 1 forming the outer wall with the spacer 3 and the heat insulating plate 4, heat can be insulated.

As described above, the end surface of the heat insulating plate 4 is opposed to the side surface 12a of the column 12 and fixed to the spacer 3, and then the heat insulating plate 4 is formed.
The end surface of the column and the side surface 12a of the column 12 are configured to be closed by the airtight tape 13 so as to exhibit airtightness. Therefore, even if a gap is formed between the end surface of the heat insulating plate 4 and the side surface 12b of the column 12, the gap can be closed by the airtight tape 13 and high airtightness can be exhibited.

Further, a rubber packing material (not shown) having elasticity and airtightness is fixed to a predetermined position of the side surface 12b of the column 12, and the end surface of the heat insulating plate 4 is pressed against the packing material. Airtightness can also be exhibited by doing so. As described above, when the packing material is used, since it is not necessary to attach the airtight tape, other members (for example, braces or braces) are provided on the side surface 12b of the column 12 and the airtight tape should be attached. It is advantageous when it is difficult.

Further, the joint of the heat insulating plate 4 or the heat insulating plate 4 and the pillar
By arranging the airtight tape 13 and the packing material having airtightness at the intersection with 12, it is possible to realize high airtightness and high heat insulation.

In this embodiment, AL is used as a concrete slab.
By using the C panel 1 and forming the air layer 6 on the indoor side of the ALC panel 1, it is possible to ensure extremely high heat insulation performance, and to prevent resonance transmission phenomenon and exhibit a high sound absorbing effect. It is possible.

[0056]

As described above in detail, in the heat insulating structure of the outer wall according to the present invention, by disposing the thin plate (spacer) between the concrete slab and the heat insulating plate made of the phenol resin foam, An air layer corresponding to the thickness can be secured, and the air layer can improve the heat insulating effect and promote absorption and diffusion of moisture from the concrete slab.

In particular, since the phenol resin foam is continuously foamed between a pair of sheets and molded, it is possible to manufacture a heat insulating plate having a length corresponding to the height of one floor. High workability can be secured. Further, the sheets provided on the front and back sides serve as a resistance member against bending, shearing, and pulling, so that strength can be secured and stable performance can be maintained.

By using a large heat insulating plate,
The number of seams can be reduced, and the seams can be reinforced by the thin plates provided at the seams.

Further, by forming the thin plate arranged between the concrete plate and the heat insulating plate by the phenol resin foam, the concrete plate and the heat insulating plate can be thermally insulated by the thin plate, and the thin plate is a thermal bridge. Is never configured. Therefore, high heat insulation performance can be secured.
Further, since the thin plates are arranged corresponding to the joints of the heat insulating plates, heat conduction and airtightness at the joints of the heat insulating plates can be secured by the thin plates.

Further, when the heat insulating plate and the thin plate are made of the phenol resin foam, the heat insulating performance and the shape performance of these do not change with time, so that stable heat insulating property can be maintained for a long time. I can.

Further, by making the end face of the heat insulating plate face the structural member and connecting the end portion thereof to the thin plate arranged between the structural member and the concrete slab, the heat insulating plate is arranged bypassing the structural member. Therefore, even when there is a structural member including columns and beams that form the frame, the structural member does not become a thermal bridge, and the heat insulating property is not impaired.

Further, by connecting the end portion of the heat insulating plate, which is arranged with the end faces facing the structural member, to the structural member by the airtight material, high airtightness can be imparted to both connecting portions, and the heat insulating performance is improved. Airtight performance can be secured.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view illustrating a heat insulating structure of an outer wall in a house.

FIG. 2 is a plan sectional view for explaining a heat insulating structure of an outer wall.

FIG. 3 is a plan cross-sectional view including columns for explaining the heat insulating structure of the outer wall.

[Explanation of symbols]

1 ALC panel 2 beams 2a Lower flange 3 spacers 4 heat insulating plate 5 floor panels 6 air layer 7 screws 8 Indoor side groundwork 9 Mounting bracket 10 Wall base material 11 space 12 pillars 12a Indoor side 12b side 13 airtight tape

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2E001 DB02 DD01 FA02 FA04 GA23                       GA28 GA76 HA04 HA07 HB01                       HD02 HD11 KA01 LA04 LA16                       ND12

Claims (4)

[Claims] 1. A heat insulating structure for an outer wall made of a concrete slab, characterized in that a thin plate is arranged between the concrete slab and a heat insulating plate made of a phenol resin foam to secure an air layer. Construction. 2. The outer wall according to claim 1, wherein the thin plate is made of a phenol resin foam, and the thin plate is arranged corresponding to a joint of a heat insulating plate made of the phenol resin foam. Thermal insulation structure. 3. A heat insulating structure for an outer wall made of a concrete slab, wherein a thin plate made of a phenol resin foam is arranged between a structural member constituting a skeleton and the concrete slab, and the structural member is made of a phenol resin foam. A heat insulating structure for an outer wall, characterized in that end surfaces of the heat insulating plate are opposed to each other and the heat insulating plate is fixed to the concrete slab through the thin plate. 4. An end portion of a heat insulating plate made of a phenolic resin foam which is arranged with its end faces facing a structural member constituting the frame is connected to the structural member by an airtight material having airtightness. The heat insulating structure for the outer wall according to claim 3.