JP2003096943A - Thermal insulating wall structure making use of foam system thermal insulating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal insulating wall structure making use of a foam system thermal insulating material capable of preventing the occurrence of condensation. SOLUTION: A vent layer 5 is faced and provided to the surface on the outdoor side of the expanding thermal insulating material 4, and a vapor permeable hole 8 connecting the vent layer 5 to the indoor side is provided to the inside of the expanding thermal insulating material 4. The vapor permeable hole 8 can be covered with a sheet-like vapor permeable waterproofing membrane 9.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a heat insulating wall structure using a foam type heat insulating material.

[0002]

2. Description of the Related Art As shown in FIG. 8A, in a heat insulating wall structure using a fiber type heat insulating material 51 such as glass wool,
The ventilation layer 5 is provided between the fiber-based heat insulating material 51 and the exterior surface material 52.
In the case where No. 3 is provided, the moisture that has entered the wall from the indoor side passes through the fiber-based heat insulating material 51 and is discharged to the outside by the air flowing through the ventilation layer 53, so that there is a risk of dew condensation on the wall. There is little sex.

[0003]

However, as shown in FIG.
As shown in, when using the foam type heat insulating material 54 as the heat insulating material, for example, in the case of a wall of an outer heat insulating structure in which the foam type heat insulating material 54 such as polystyrene foam is installed outside the structural body of the building, The foam-type heat insulating material 54 has a high moisture permeation resistance by itself, so that moisture on the indoor side cannot pass through this foam-type heat insulating material 54, and there is a risk that dew condensation 55 occurs on the indoor side of the foam-type heat insulating material 54. high.

In view of the above problems, it is an object of the present invention to provide a heat insulating wall structure using a foamed heat insulating material, which can prevent the occurrence of dew condensation.

[0005]

[Means for Solving the Problems] The above-mentioned problem is solved in the foamed heat insulating wall structure using a foamed heat insulating material in which a ventilation layer is provided facing the surface of the foamed heat insulating material on the outdoor side. This is solved by a heat insulating wall structure using a foam heat insulating material, characterized in that a hole for moisture transmission is provided in the surface of the material for communicating the ventilation layer and the indoor side.

[0006] In this heat insulating wall structure, since moisture permeation holes that connect the ventilation layer and the indoor side are provided in the surface of the foam type heat insulating material, the moisture from the indoor side is protected from moisture. The air passes through the foamed heat insulating material through the moisture-permeable holes provided in the air-conditioning layer and is discharged to the outside by the air flowing through the ventilation layer. This makes it possible to prevent dew condensation.

When the moisture permeable holes are covered with a moisture permeable and waterproof membrane, moisture from the indoor side passes through the foamed heat insulating material through the membrane and is exposed outdoors by the air flowing through the ventilation layer. It is possible to prevent the water from being discharged to the inside of the wall to form dew condensation, and since this membrane does not allow water to pass through, this foamed heat insulating material can be used as a water blocking layer.

Further, the moisture-permeable hole comprises a pin hole,
When a large number of pin holes for moisture transmission are opened in the foam insulation material in a dispersed state, moisture from the indoor side passes through the foam insulation material through each pin hole and is generated by the air flowing through the ventilation layer. It is possible to prevent dew condensation from being discharged outdoors. The size of the pin hole is such that air does not almost move back and forth due to the pressure difference between the two sides sandwiching the foam heat insulating material, and the heat insulating performance of the foam heat insulating material is not impaired, for example, a diameter of 1 m.
It is preferable that the value is set to about m.

A foam type heat insulating material having a hole for allowing moisture to permeate from one surface side to the other surface side in the surface is a foam type heat insulating material having high moisture resistance. In spite of this, it is possible to give this foam insulation the necessary moisture permeability, avoiding the difficulty of lowering the moisture resistance of the foam material itself for heat insulation, and to provide a foam system with excellent moisture permeability. The heat insulating material can be easily manufactured.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

The heat insulating wall of the first embodiment shown in FIGS. 1 and 2 is an external heat insulating wall of an externally added type, 1 is an exterior surface material made of ceramics or the like, and 2 is a gypsum board or the like. It is an interior surface material, and between these surface materials 1 and 2, a fiber-based heat insulating material 3 such as glass wool is put on the back side of the interior surface material 2, and outside the body of the building,
On the outdoor side of the fiber-based heat insulating material 3, a foam-based heat insulating material 4 made of polystyrene foam or the like for external heat insulation is installed, and a ventilation layer 5 is provided between the foam-based heat insulating material 4 and the exterior surface material 1. Has been formed. In addition, 6 ... is a pier to which the interior surface material 2 is attached, and 7 ... is also a pier.
Is interposed between the foam heat insulating material 4 and the exterior surface material 1,
The ventilation layer 5 extending vertically is formed between them.

In the heat insulating wall, the foam heat insulating material 4 is formed with moisture-permeable holes 8 ... Penetrating both sides of the foam heat insulating material 4 on both sides of the foam heat insulating material 4. The layer 5 and the indoor side are connected in a moisture-permeable manner. Further, in the present embodiment, these holes 8 ... Are covered with a moisture-permeable and waterproof film 9, respectively. With this film 9, these holes 8 ... Allow water vapor to pass through but not rainwater. It is formed in the hole.

In order to provide the holes 8 ... of the foam type heat insulating material 4 with such a moisture-permeable and waterproof function, in the present embodiment,
A cap 10 as shown in FIG. 3A is fitted into each of these holes 8.

As shown in FIG. 3B, the cap 10 is made by combining a cap body 10a, a moisture-permeable waterproof sheet 9 forming a moisture-permeable waterproof membrane, and a sheet retainer 10b. The cap body 10a is a resin molded product in which the outer flange plate portion 10d for positioning is integrally provided at the base end portion of the cylindrical portion 10c fitted in the hole 8 of the foam heat insulating material 4, and , Seat restraint 10b
Is a ring-plate-shaped resin molded product corresponding to the outer flange plate portion 10d of the cap body 10a. The moisture-permeable and moisture-proof sheet 9 covers the inside of the cylindrical portion 10c.
It is provided on the cap 10 by being sandwiched between the outer flange plate portion 10d of 0a and the ring-shaped holding member 10b.

As shown in FIGS. 3 (C) and 3 (D), the cap 10 is provided with the tip of the cap body 10a from one surface side of the foamed heat insulating material 4, in this embodiment from the outdoor surface side. The side is fitted into the hole 8 of the foamed heat insulating material 4 so that the outer flange plate portion 10d of the cap body 10a is brought into contact with the peripheral edge portion of the hole 8 so as to be attached. Between the cap 10 and the foam insulation 4, the cap body 1
It is water-tightly sealed by a sealing material 11 such as an Epto sealer (trade name) provided on the side of the outer flange plate portion 10d of 0a.

In the above-mentioned heat insulating wall, as shown in FIG. 1B, the moisture that has entered the wall from the indoor side is protected by the foam heat insulating material 4.
Through the moisture-permeable waterproof sheet 9 provided in the moisture-permeable hole 8 provided in the. Even when used as a heat insulating material, it is possible to prevent dew condensation from occurring in the wall. Moreover, in this embodiment, the holes 8
Is covered with a moisture-permeable waterproof sheet 9 that also has a waterproof function, so that water does not come and go through this hole 8,
Therefore, the foamed heat insulating material 4 can function as a water blocking layer for rainwater. The holes 8 may be covered with a moisture-permeable waterproof sheet 9 instead of the cap type as described above, or a sponge-like three-dimensional film or a fiber may be used as a moisture-permeable waterproof film. A system heat insulating material may be used and these may be put in the hole 8 so that the hole 8 covers.
Further, by using a film having a large ventilation resistance as the moisture-permeable and waterproof film 9, it is possible to suppress the deterioration of the heat insulating performance of the foamed heat insulating material 4.

In the heat insulating wall of the second embodiment shown in FIGS. 4 to 6, a large number of pin holes 13 having a diameter of about 1 mm are opened in a dispersed state in the surface of the foam heat insulating material 4. , Each of these pin holes 13 is used as a moisture-permeable hole in the present invention. Others are the same as those in the first embodiment. Even in such a heat insulating wall structure, as shown in FIG. 4B, the moisture that has entered the wall from the indoor side passes through the foam heat insulating material 4 through each pin hole 13 and flows through the ventilation layer 5. It is prevented from being discharged outdoors by the air and causing dew condensation in the wall. If the holes 13 are as small as pin holes, the resistance of the air passing through the holes 13 is large, and the air flows back and forth due to the pressure difference between the two sides sandwiching the foam heat insulating material 4. The heat insulating performance of the system heat insulating material 4 is not impaired.

The heat insulating walls of the third and fourth embodiments shown in FIGS. 7 (a) and 7 (b) are the same as the heat insulating wall structures of the first and second embodiments, except that the fibers on the back side of the interior surface material 2 are the same. The system heat insulating material 3 is omitted, and the system heat insulating material 3 is applied to the foamed heat insulating material 4 having an outer heat insulating wall structure with the air layer 14. in this way,
The heat insulating wall of the present invention is not limited to an externally attached additional heat insulating wall that uses an outer heat insulating material made of a foam heat insulating material 4 in addition to the fiber heat insulating material 3, and the fiber heat insulating material 3 may be omitted. Material 4
It can also be applied to an external heat insulating wall that is insulated only by the external heat insulating material. Of course, it is not limited to such an outer heat insulating structure, and can be applied to a heat insulating wall having a foamed heat insulating material as an inner heat insulating material.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, the size and shape of the moisture-permeable holes provided in the foam heat insulating material 4, the number,
There is no particular limitation on the distribution state, and it suffices that holes are provided so as not to significantly impair the heat insulating performance of the foamed heat insulating material.

[0020]

EFFECTS OF THE INVENTION Since the present invention is as described above, it is possible to prevent dew condensation in the wall in a heat insulating wall structure using a foam heat insulating material.

[Brief description of drawings]

1A and 1B show a structure of a heat insulating wall according to a first embodiment, wherein FIG. 1A is a sectional plan view and FIG. 1B is a sectional side view.

FIG. 2 is a cutaway perspective view of the heat insulating wall.

3 (a) is a perspective view showing a foamed heat insulating material and a cap for film formation in a separated state, FIG. 3 (b) is an exploded perspective view of the cap, and FIG. 3 (c) is before the cap is fitted. Is a cross-sectional side view, and FIG. 4D is a cross-sectional side view with a cap fitted.

4A and 4B show a structure of a heat insulating wall according to a second embodiment, wherein FIG. 4A is a sectional plan view and FIG. 4B is a sectional side view.

FIG. 5 is a cutaway perspective view of the heat insulating wall.

FIG. 6 (a) is an overall front view of the foam heat insulating material, and FIG. 6 (b) is a side view of the same section.

FIG. 7 is a plan sectional view showing a heat insulating wall of a third embodiment of FIG. 7A, and FIG. 7B is a plan sectional view showing a heat insulating wall of a fourth embodiment.

FIG. 8A is a sectional plan view showing a conventional heat insulating wall, and FIG. 8B is a sectional plan view showing another conventional heat insulating wall.

[Explanation of symbols] 4 ... Foam insulation 5 ... Ventilation layer 8 ... Pores for moisture vapor transmission 9. Moisture-permeable waterproof sheet (membrane) 13 ... Pin hole (moisture permeable hole)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ryuichi Kudo             6-6 Sakyo 6-2, Nara, Nara Stock Association             Inside Yamato Research Institute (72) Inventor Tomoaki Sawashima             6-6 Sakyo 6-2, Nara, Nara Stock Association             Inside Yamato Research Institute F term (reference) 2E001 DB02 DB04 DB05 DD01 FA03                       GA18 GA24 GA42 HA03 HA33                       HD01 HD03 ND12

Claims (4)

[Claims] 1. A heat insulating wall structure using a foam type heat insulating material, wherein a gas permeable layer is provided facing the surface of the foam type heat insulating material on the outdoor side. A heat insulating wall structure using a foamed heat insulating material, which is provided with a moisture-permeable hole communicating with the indoor side. 2. The heat insulating wall structure according to claim 1, wherein the moisture permeable hole is covered with a moisture permeable and waterproof membrane. 3. The heat insulating wall structure according to claim 1, wherein the moisture permeable holes are pin holes, and a large number of the moisture permeable pin holes are opened in a foamed heat insulating material in a dispersed state. 4. A foamed heat insulating material, characterized in that holes are provided in the surface to allow moisture to permeate from one surface side to the other surface side.