JP3479807B2 - External insulation method for wooden houses - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal insulation technique for a wooden house, and more particularly, to an external thermal insulation method for a wooden house. 2. Description of the Related Art There are two types of heat insulation structures in a wooden house: an inner heat insulation method and an outer heat insulation method. As the external heat insulation method, it is generally known that the following heat insulation layer is attached to the back side of the external wall material. A heat insulation layer in which a styrene foam or urethane foam heat insulating plate is laminated on the back of the outer wall material. Heat insulation layer formed by combining glass wool and poly film. [0003] The above-mentioned conventional heat insulation technology has the following problems. <A> In the case of a heat insulating layer in which a styrene foam or urethane foam heat insulating plate is superposed, a lot of labor is required for a site worker, and the construction period and construction cost are increased. In addition, styrene foam has a large shrinkage,
It has been pointed out that a gap is easily generated in the heat insulating layer after the construction. <B> In the case of a heat insulating layer formed of a combination of glass wool and poly film, since the heat insulating layer is fixed by driving a brain nail from the inner wall material side, shrinkage of the wood,
A gap is easily generated due to the movement of the building or the like. In addition, the brain nail penetrates the glass wool and the poly film, and moisture enters the glass wool, and the heat insulating property, airtightness, and durability decrease with time. <C> As a problem common to both,
Wooden houses usually have a structure in which reinforcing members such as studs are interposed between the outer wall material and the inner wall material, and the heat insulation layer is placed away from the positions where these reinforcing members are installed. do not have. Therefore, heat is easily transmitted through the reinforcing member. SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide an external heat insulation method for a wooden house which is excellent in workability and can improve the heat insulation effect. To provide. SUMMARY OF THE INVENTION The present invention relates to a method for externally insulating a wooden house in which a heat insulating material is laminated on the back side of an outer wall material and an air layer is formed between the heat insulating material and the inner wall material. Weakly heat-conductive member is interposed between the pillar and the outer wall material, and just before the inner wall material is constructed, the foaming liquid is sprayed from the room side directly to the back of the outer wall material in multiple layers.
By attaching, the skin layer resinized on the surface of each layer
Spray foam insulation is formed by spraying in a layered manner so as to be formed, and on the back surface of the outer wall material, a continuous heat insulation airtight layer is formed by the weak heat conductive member and the spray foam insulation. External insulation method for wooden houses. Embodiments of the present invention will be described below with reference to the drawings. <A> Frame of Wooden House FIG. 1 shows an example of a heat insulating structure of a wall in a wooden house.
2 and 3 show cross-sectional views of a wall of a wooden house. The framework of a wooden house will be briefly described with reference to FIGS. 2 and 3. A wooden base 2 is placed horizontally on a foundation 1 made of concrete or the like, and columns 3 and studs 4 are provided on the base 2. Are erected at intervals. Between the upper portions of the pillars 3 and the studs 4, a trunk difference 5 is suspended and supports a roof 6. The above is a known structure. <B> Heat insulation structure of wall portion The outer wall material 7 is insulated from the columns 3 and the studs 4 via the columnar base material 9 and attached thereto. The base material 9 is made of a member having low heat conductivity in consideration of heat conduction. Examples of the material include a hard resin-based heat insulating material such as polystyrene and polyurethane, or a combination of these hard resin-based heat insulating material and base wood. Can be integrated with an adhesive or the like. Such a base material 9 is attached to each of the pillars 3 and the studs 4 and the outer wall material 7 by known means such as bonding or nailing. Further, an inner wall material 10 is attached to the indoor side of the pillar 3 and the stud 4 at a certain distance from the spray foam insulation material 8.
An air layer 11 is formed between the inner wall material 10 and the inner wall material 10. Next, a method for applying the spray foam insulation will be described. <A> Construction time of spray foam insulation material As described above, the outer wall material 7 to which a heat insulation material is previously attached has been attached as an external insulation method of the wall portion. In the present embodiment, the base 2, the pillar 3, the stud 4, the roof 6,
Attachment of the outer wall material 7 and the fittings at the window opening is completed, and spray foam insulation 8 is applied at a stage where only the attachment of the inner wall material 10 is left. <B> Method of Forming Spray Foam Insulating Material As shown in FIG. 1, the spray foaming heat insulating material 8 is formed by spraying a foaming liquid 13 from an spray gun 12 toward the outer wall material 7 in a layered manner and foaming in-situ. When the spray foam insulation material 8 is applied, it is important to form the base 9 having low thermal conductivity and the continuous heat-insulating airtight layer 14 made of the spray foam insulation material 8 on the outside of the pillars 37 and the studs 4 (on the outer wall material 7 side). It is. At the time of actual construction, multiple sprays of 25 cm or less are used. By performing multiple spraying, a resinized skin layer is formed on the surface of each layer, and a highly airtight spray-foamed heat insulating material 8 can be obtained in combination with urethane foam which is a closed cell. Also, in forming the spray foam insulation 8,
It is necessary to cure the foam 2, so that the foaming liquid 13 does not adhere to the entire surface of the wood, such as the base 2, the pillar 3, the stud 4, and the body gap 5. This is to disperse the moisture of the wood. As a countermeasure,
For example, a method in which the surface of the wood is covered with a sheet member before spraying the foaming liquid 13 is preferable. Further, as the foaming liquid 13, a foamed plastic foam such as a polyurethane foam, a polyisocyanurate foam, and a phenol foam is preferable in terms of heat insulation performance and workability. Further, the spray foam insulation material 8 is required to have heat insulation and airtightness, but does not require special strength performance such as compression and tension. Therefore, the foaming liquid 13 is usually formulated to be softer than foaming, and is used for movement and shrinkage of building materials and buildings. Be able to follow. <C> Reason of spraying from the indoor side A method of applying the spray foam insulation material 8 from the outside of the building can be considered. However, in the spraying work from the outside, it takes time and effort to assemble and disassemble the work scaffolding, and foaming is easily affected by weather, temperature and humidity, etc., so that stable construction is difficult. Spraying from the inside of the building can eliminate such inconveniences at once. <D> Heat insulation performance Next, heat insulation performance will be considered. In FIG. 3, a continuous heat-insulating airtight layer 14 is formed inside the outer wall material 7, and an air layer 11 is formed between the heat-insulating airtight layer 14 and the inner wall material 10. In addition, the base 9 having low heat conductivity is interposed between the pillars or the studs 4 and the outer wall material 7 to thermally insulate the base. Therefore, it exhibits high heat insulation performance. As described above, the present invention has the following effects. <B> The elimination of the process, labor saving, and shortening of the construction period are achieved, and the workability is greatly improved. <B> High heat insulation performance is achieved by interposing a weak heat conductive member between the pillar and the outer wall material to block heat conduction, and forming a continuous heat insulating airtight layer by spray foaming on the back surface of the outer wall material. can get. <C> Since the foaming liquid is sprayed from the inside of the building, stable construction can be performed throughout the year without being affected by outdoor weather. <D> Since the insulation work leaves the carpenter's hands and becomes a professional job, a uniform heat-insulating and airtight layer can be obtained regardless of the carpenter's skill.

[Brief description of the drawings] FIG. 1 is a perspective view in which a part of a wooden house is omitted. FIG. 2 is a side view thereof. FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Shiro Nagahata               1-18-1 Nishiarai Sakaecho, Adachi-ku, Tokyo Nisshin               Spinning Co., Ltd. Nishiarai Chemical Plant                (56) References JP-A-56-150250 (JP, A)                 JP-A-60-138143 (JP, A)                 JP-A-48-19020 (JP, A)                 Actual opening Hei 4-73115 (JP, U)                 Actual opening Hei 2-20605 (JP, U)                 Japanese Utility Model 4-10610 (JP, U)                 Actual opening Hei 2-51607 (JP, U)

Claims (1)

(57) [Claims 1] A method for externally insulating a wooden house in which a heat insulating material is laminated on the back side of an outer wall material and an air layer is formed between the heat insulating material and the inner wall material. Weakly heat conductive member is interposed between the outer wall materials, and immediately before the construction of the inner wall material, the foaming liquid is directly applied from the indoor side to the back surface of the outer wall material ,
By performing multiple spraying, the resinized
A spray foam heat insulating material is formed by spraying in a layered manner so that a kin layer is formed, and a continuous heat insulating airtight layer is formed on the back surface of the outer wall material by the weak heat conductive member and the spray foam heat insulating material. The external insulation method in a wooden house.