JPH0782857A - External wall structure of wooden building - Google Patents

Abstract

PURPOSE:To simplify a construction work by stretching a waterproof sheet having mortar adhering projecting and recessed surface on the outer surface side of a building frame and applying mortar directly on the waterproof sheet. CONSTITUTION:A mineral surfaced asphaltfelt roofing 10 as a waterproof sheet is stuck, with the mineral surfaced asphaltfelt surface 10a outside on the exterior side of a wooden lath beam 1a ... horizontally laid between columns 1b, 1b of a building frame 1. Subsequently, mortar 4 is applied directly on the roofing 10, and further a facing layer 5 used on the outer surface side of the mortar 4 is applied by spray painting or the like. Subsequently, as the waterproof sheet 10 does not have hygroscopic property, even if it gets wet in the rain before mortar application, it will not be swollen, and after dried, it keeps the flat state at the time of stretching and the thickness of mortar 4 is made uniform by itself not to cause cracks. Thus, the sheet 10 has mortar adhering projecting and recessed surface 10a, so that the need of lathing can be eliminated and a construction work can be simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mortar coating outer wall structure for wooden construction.

[0002]

2. Description of the Related Art Conventionally, as a mortar-coated outer wall of a wooden construction, as shown in FIG. 2, a black asphalt felt (2) is nailed to the outer surface side of a wooden frame (1a) of a building frame (1). Or glue and staple (3
Place the metal lath (3) with a) and mortar (4)
Rubbing, intermediate coating, and top coating in this order, and then coating and scraping lysine (cement material containing lime silicate as a main component including pigments and aggregates) to provide a rough finish layer (5). The structure is universal. In recent years, the finishing layer (5) tends to be made of resin lysine or elastic lysine, which has a high waterproof property and contains a polymer material. In the figure, (1b) is a pillar such as a stud, (6) is an interior plasterboard, and (7) is a wall surface finishing material such as wallpaper.

The above-mentioned asphalt felt (2) is a porous cardboard soaked with straight asphalt, has a hygroscopic property, and the mortar is in an undried state. It has the effect of absorbing water and swelling during the high humidity period when dew condensation occurs, and releasing that water during the dry period when the conditions for dew condensation disappear. However, in the past, in order to enhance the water content adjusting function based on the above water absorption characteristics, there was a tendency to use a thick asphalt felt (2) to increase the saturated water content. The finish layer (5) is roughened in order to increase the surface area so that the moisture released from the asphalt felt (2) can be easily volatilized into the outside air through the mortar (4). there were.

[0004]

However, in the above-mentioned conventional outer wall structure, it is easy for moisture to form dew condensation or mold on the indoor side of the wall, which causes bleeding on the indoor wall surface and plasterboard (6) used for interior decoration. Has a problem of being softened and deformed by moisture. In particular, the above problem is remarkable when resin lysine or elastic lysine is used for the finishing layer (5),
In addition, the thickness of the mortar (4) becomes non-uniform and cracks are likely to occur, and moisture such as rainwater invades from the cracks, and the infiltrating rainwater causes the asphalt felt (2) to absorb water and swell, or the metal lath (3). In many cases, water exudes from the punching holes of the staples (3a) to which the water is extruded toward the indoor side.

[0005]

In view of the above situation, the inventors of the present invention have made various studies on the cause of the conventional problems, and found that the indoor side of the wall is condensate or mold, and the plasterboard is softened or deformed. Moisture that is a factor is brought about by the moisture contained in the asphalt felt,
In particular, when resin lysine or elastic lysine is used for the finishing layer on the outdoor side, the effect on the indoor side is large because the moisture does not escape to the outdoor side due to its waterproof property, and the rain before the mortar coating is applied. When the asphalt felt that has been swollen and swelled with water etc. is deformed into a wavy shape when it dries, the thickness of the mortar coated on it becomes uneven and cracks easily occur, thus adjusting the water content in the asphalt felt. We have found that the conventional idea of having a function is basically wrong, and rather a material that does not absorb moisture should be used.

As a result of further in-depth experimental research based on the above findings, when a specific waterproof sheet is used instead of the conventional asphalt felt, the adverse effect on the indoor side due to moisture from inside the wall is caused. It was found that the mortar has a uniform thickness, cracks are less likely to occur, and lathing is unnecessary, construction work is significantly simplified, and construction cost is greatly reduced, and the invention is made. I arrived.

That is, in the outer wall structure of the wooden construction according to claims 1 and 2 of the present invention, the waterproof sheet (10) having the uneven surface (10a) with mortar adhesion is stretched on the outer surface side of the building body (1). The waterproof sheet (10) is coated with the mortar (4) directly or through a bonding layer made of polymer cement or the like.

According to claims 3 and 4 of the present invention, in the outer wall structure of the wooden construction according to claims 1 and 2, an inorganic or organic material such as sand or synthetic resin particles is formed on the surface of the roofing as the waterproof sheet (10). This is a sheet-like material having a surface formed in a concavo-convex shape by adhering a granular material, particularly a roofing with sand is used.

[0009]

[Function] Since the waterproof sheet (10) has no hygroscopic property,
Even if resin lysine or elastic lysine is used for the finishing layer (5), moisture is not released from the inside of the wall to the indoor side, and it does not swell even if it is wet with rain before mortar coating, and even after its drying. Since the flat state is maintained at the time of stretching, the thickness of the mortar (4) coated thereon is naturally uniform. Then, the waterproof sheet (10) has a rough surface (10
Since it has a), it does not require lathing as in the past,
The mortar (4) can be directly coated on the waterproof sheet (10).

When a bonding layer made of polymer cement or the like is previously provided on the waterproof sheet (10) for the purpose of increasing the adhesive strength of the mortar (4) to the waterproof sheet (10), in addition to the above-mentioned action of strengthening the bonding force. , Waterproof sheet (1
It is also possible to contribute to the improvement of the waterproof property of the fastening part when nailing 0). The above-mentioned bonding layer is applied by brush coating, iron coating or the like.

The waterproof sheet (10) may be any as long as it has an uneven surface (10a) to which mortar adheres and does not have a hygroscopic property. For example, a synthetic resin sheet having an uneven surface formed by embossing or the like. Or asphalt roofing with sand, or a sheet with inorganic or organic particles such as sand or synthetic resin particles attached to the surface of a roofing that uses asphalt rubber in which synthetic rubber and asphalt are mixed instead of the asphalt of the roofing The thing etc. can be used. In particular, the use of asphalt roofing with sand is preferable from the viewpoint of easy availability of the material on the market. This asphalt roofing with sand is a product in which both sides of asphalt felt are coated with soft blown asphalt, and then one side is coated with sand grains or crushed grains of pottery. Since it is sealed with asphalt, it does not show hygroscopicity and is excellent in waterproofness, and the sanded surface shows strong adhesion to the mortar (4). In addition, blown asphalt is softer and has poorer elongation and stickiness than straight asphalt impregnated with asphalt felt, but has a characteristic that it has high heat resistance and does not melt even at a considerably high heat.

[0012]

1 shows an outer wall structure of a wooden building according to an embodiment of the present invention. In this outer wall structure, the building frame (1)
Sandlined asphalt roofing (10) as a waterproof sheet is bonded to the outdoor side of the wooden sled (1a) that is horizontally passed between the pillars (1b) and (1b) with the sanded surface (10a) facing outside. The mortar (4) is directly applied onto it, and the finishing layer (5) used on the outer surface side of the mortar (4) is applied by spray coating or the like. A plasterboard (6) is attached to the indoor side of the building body (1), and wallpaper (7) is attached to the surface of the plasterboard (6).

According to the above outer wall structure, the asphalt roofing (10) with sand does not have a hygroscopic property, so that moisture accompanying the release of the absorbed moisture unlike the conventional asphalt felt causes dew condensation on the inner wall surface. No mold or softening and deformation of the plaster board (6) occurs, and the roofing with sand (10) does not swell even if wet with rain before coating the mortar, and when stretched even after drying. Since the flat state is maintained, the thickness of the mortar (4) coated thereon is naturally uniform, and cracks of the mortar (4) due to the nonuniformity of thickness as in the past do not occur. As described above, there is no release of water from the roofing with sand (10) and it is not necessary to vaporize the water in the wall to the outside through the mortar (4). Therefore, resin lysine or an elastic material is used as the finishing layer (5). There is no problem even if a highly waterproof material containing a polymer material such as lysine is used.

Moreover, in the outer wall construction, the mortar (4) can be directly coated on the sand roofing (10), and the step of tensioning the metal lath with staples, which has been conventionally required, is omitted. The labor of work is significantly reduced, high construction efficiency is obtained, and construction cost and material cost are greatly reduced. The finishing layer (5) may be applied after the mortar (4) has been sufficiently dried.

Although the asphalt roofing (10) with sand is used as the waterproof sheet in the above embodiment, a synthetic resin sheet or the like having an uneven surface formed by embossing or the like can be used instead of the asphalt roofing (10). . Further, as a means for stretching these waterproof sheets on the building frame, other than using the adhesive as illustrated, a method of fastening with a tacker nail or the like can be adopted, and even with such nailing, moisture enters from the nail fastening part. There is no fear of doing it. Further, the present invention can be similarly applied to the building frame (1) having various wall foundation structures other than the exemplified wooden shear (1a).

In the above embodiment, the mortar (4) is directly coated on the roofing (10) as a waterproof sheet, but as described above, the mortar (4) and the roofing (10) are bonded together. In order to strengthen the force, a bonding layer (not shown) such as polymer cement may be provided in the middle. This bonding layer is, for example, 4 kg of cold water, 4 kg of cement, 2 kg of SBR emulsion (solid content 50%),
And 70 g of methyl cellulose can be preferably used, and the mortar (4) is applied to the waterproof sheet such as the roofing (10) with a predetermined thickness by brush coating or iron coating. It is possible to strengthen the attachment force and to improve the waterproofness of the nail hole portion and the like when the waterproof sheet is fixed and stretched by nailing or the like.

[0017]

According to the first and second aspects of the present invention, as an outer wall structure of a wooden building where mortar coating is applied, moisture or moisture from inside the wall may cause dew condensation or mold on the wall surface on the indoor side. The interior plasterboard will not be softened and deformed, and highly waterproof coating materials such as resin lysine and elastic lysine can be used for the finish layer on the outdoor side without any problems, and due to the uneven mortar thickness. The cracks do not occur and rainwater etc. can be surely prevented from entering through the cracks, and the lathing step, which was conventionally required in construction, is not required, and the labor of construction work is greatly reduced, resulting in high construction efficiency. In addition to the above, it is possible to significantly reduce the construction cost and the material cost.

According to the third and fourth aspects of the present invention, as the above-mentioned outer wall structure, there is provided a structure excellent in the coating property and the coating strength particularly for the mortar base.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an outer wall structure of a wooden building according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing an outer wall structure of a conventional wooden building.

[Explanation of symbols]

 1 ... Building frame 1a ... Wood shearing 1b ... Pillars 4 ... Mortar 5 ... Finishing layer 6 ... Plaster board 7 ... Wallpaper 10 ... Sand roofing (waterproof sheet) 10a ... Sand surface (uneven surface with mortar adhesion)

Claims (4)

[Claims] 1. An outer wall structure of a wooden construction in which a waterproof sheet having a mortar-adhering uneven surface is stretched on the outer surface side of a building frame, and mortar is directly coated on the waterproof sheet. 2. A wooden construction in which a waterproof sheet having an uneven surface with mortar adhesion is stretched on the outer surface side of a building skeleton, and mortar is coated on the waterproof sheet via a bonding layer made of polymer cement or the like. Outer wall structure. 3. The waterproof sheet is a sheet-like article having an uneven surface formed by adhering an inorganic or organic granular material such as sand or synthetic resin particles on the surface of the roofing. The outer wall structure of the wooden construction described. 4. The outer wall structure of a wooden construction according to claim 3, wherein the waterproof sheet is made of asphalt roofing with sand.