JPH04254638A - Exterior wall structure with ventilation layer in wooden house - Google Patents

Abstract

PURPOSE:To prevent the occurrence of dew condensation within an exterior wall by introducing air from underfloor into a ventilating layer within the exterior wall for a wooden house. CONSTITUTION:A throating 4 is provided for the lower section of an exterior wall finish member 7 wherein the throating is communicated with a ventilating layer 8 provided for the inner side of the exterior wall 7, and concurrently acts as a means preventing outside air from directly coming in. A ventilating packing member 2 is interposed between a foundation 3 and a continuous footing 1 wherein the packing member introduces inside air to the throating 4 while being communicated with an underfloor. The occurrence of dew condensation within the exterior wall is prevented by introducing air within the underfloor which is higher in temperature than outside air, into the throating 4 so as to let it flow in the ventilating layer 9 via the throating 4, and the inside of the exterior wall is thereby concurrently heated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer wall structure of a wooden house having a ventilation layer that improves ventilation and moisture resistance of the wooden house.

0002

[Prior art] In warm and humid climates like Japan, it is common sense to provide ventilation in wooden houses in order to protect buildings from moisture.In cold region houses, ventilation layers are provided inside the outer walls to allow air to circulate. The ventilation layer construction method is known.

[0003] In this case, a structure is adopted in which outside air is directly introduced into the ventilation layer through a gap between the outer wall finishing material and the inner wall in the drainage part of the foundation.

[0004] In the above-mentioned structure in which outside air is directly introduced into the outside wall, when the outside air temperature is low, the temperature of the outside wall itself is lowered by the low-temperature air, which promotes the formation of dew condensation inside the wall. Therefore, the current situation is that the above-mentioned ventilation layer construction method cannot completely suppress the occurrence of internal dew condensation in cold regions.

FIG. 3 is an explanatory diagram showing an example of an exterior wall structure having such a ventilation layer. To explain the details using the same figure, the ventilation layer is located outside the heat insulating layer such as glass wool, and is attached to the exterior wall finishing material. is established between.

[0006]The water vapor contained in indoor air is
It has a partial pressure (water vapor pressure) corresponding to the amount of water vapor at that time and the room temperature, and in winter, the pressure is considerably higher than the water vapor partial pressure of the outside air. Therefore, due to the pressure difference, the indoor water vapor passes through the gaps in the outer wall material and its constituent materials and diffuses into the outside air, but at the stage where the water vapor passes through the heat insulating layer, the temperature of the water vapor actually becomes close to the outside air temperature. Therefore, at this point, condensation has already formed, but this condensation is introduced into the ventilation layer through which the air flows, and is released into the outside air through the upper eave and attic before it is absorbed by the structural materials. This is what the ventilation layer construction method is designed to do.

[0007]

[Problems to be Solved by the Invention] In the above-mentioned ventilation layer, since low-temperature outside air is directly introduced into the interior during cold weather, the internal temperature of the ventilation layer not only becomes as low as the outside temperature, but also reduces the temperature of the insulation layer. This is a contradictory condition from the viewpoint of preventing condensation if it penetrates into the interior and lowers its temperature and loses its insulation properties.

[0008] Therefore, it is a problem to directly introduce outside air into the ventilation layer inside the outer wall. Therefore, the present invention has a ventilation layer that achieves moisture resistance without directly introducing outside air into the ventilation layer inside the outside wall. The purpose is to provide external wall structures for wooden houses.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an external wall structure for a wooden house having a ventilation layer provided inside the external wall to introduce air into the ventilation layer to prevent dew condensation. A wooden building having a ventilation layer that is equipped with a drainage layer that communicates with the ventilation layer and prevents direct inflow of outside air, and a ventilation means that is interposed between the foundations of the wooden house and allows internal air under the floor to be introduced into the drainage. A residential exterior wall structure is provided.

0010

Embodiments Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the outer wall and foundation portion of a wooden house outer wall structure having a ventilation layer according to the present invention.

In the figure, reference numeral 1 denotes a cloth foundation, and a ventilation opening 11 is provided at a predetermined position, and a shutter 12 is arranged, which can be opened in the summer and closed in the winter to freely control the air introduced under the floor, for example. The outer surface of the cloth foundation 1 is covered with a heat insulating material 13.

[0014] Reference numeral 2 denotes a packing material that has air permeability and serves as a means of venting the air under the floor.As shown in FIGS. The insertion groove 22 is formed and is interposed between the cloth foundation 1 and the base 3, and is molded, for example, from a synthetic resin material.

Reference numeral 4 denotes a drainer, which is made of extruded aluminum, for example, and whose cross section is formed as shown in FIG. The section 42 is placed on the back side of the exterior wall finishing material, which will be described later, and is used as a drainer to prevent air from entering from outside.

5 is a floor joist which has a heat insulating material inside to insulate the floor and the underfloor; 6 is a heat insulating layer made of a heat insulating material; and on the indoor side, there is a floor finishing material 51 and an inner wall material, respectively. 61 to form an indoor space, a waterproof layer 62 is provided on the outside of the heat insulating layer 6, and a moisture-proof layer 63 is provided on the indoor side to prevent moisture in the room.

[0017] Reference numeral 7 denotes an exterior wall finishing material, and the above-mentioned waterproof layer 62
A vertical beam is attached to a heat insulating layer 6 having a wall finishing material to protect the house from wind and rain, and a ventilation layer 8 that communicates vertically is formed between the outer wall finishing material 7 and the waterproof layer 62. has been done. The vertical part 42 of the above-mentioned drainer 4 is sandwiched on the lower back side of the outer wall finishing material 7, and as shown in the figure, caulking 71 is used between the lower end of the outer wall finishing material 7 and the drainer 4 to prevent rainwater from entering. has been done. In addition, by installing the drainer 4, the air inside the floor is removed from the ventilation hole 21 of the packing material 2.
It is configured to reach the drainer 4 through the vent layer 8, and to be guided upward from below the ventilation layer 8.

In this embodiment configured as described above, the air under the floor whose temperature is relatively higher than that of the outside air is introduced into the ventilation layer 8 of the exterior wall finishing material 7 by the gas permeable packing material 2 and the drainer 4. The air flows out from above the ventilation layer 8 toward the eaves and attic.

Therefore, even under conditions where dew condensation occurs due to the direct introduction of outside air in the above-mentioned ventilation layer construction method, dew condensation within the outer wall is prevented.

Although the present invention has been described above with reference to the above-mentioned embodiments, various modifications can be made within the scope of the present invention, such as using other materials for the packing material and draining material. However, these modifications are not excluded from the scope of the present invention.

[0021]

Effects of the Invention As explained in the above embodiments, according to the present invention, the drain placed at the bottom of the outer wall does not directly introduce outside air into the ventilation layer inside the outer wall, but instead allows air to pass through the air-permeable packing material. Since only the air under the floor is introduced into the ventilation layer,
Since air with a higher temperature than the outside air passes through the ventilation layer, it is possible to prevent dew condensation inside the exterior wall caused by the temperature difference, and there is also the advantage that the surface temperature of the exterior wall finishing material on the indoor side is increased.

Further, according to the present invention, the above-mentioned ventilation layer can be dried by ventilating the outside air by opening the ventilation holes provided in the cloth foundation in summer, and furthermore, high temperature heat due to solar radiation can be discharged.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of an outer wall and a foundation portion of a wooden house outer wall structure having a ventilation layer according to the present invention.

FIG. 2 is an explanatory diagram of a drainer [FIG. 2(A)] and a packing material [FIGS. 2(B) and (C)] in this embodiment.

FIG. 3 is an explanatory diagram showing an example of a conventional outer wall structure having a ventilation layer.

[Explanation of symbols]

1...Cloth foundation 2...Packing material 3...Foundation 4... Drain 6...Insulating layer 7...Exterior wall finishing material 8... Ventilation layer

Claims (1)

[Claims] In a wooden house exterior wall structure having a ventilation layer that introduces air into the ventilation layer provided inside the exterior wall and prevents condensation, a drain that communicates with the ventilation layer and prevents direct inflow of outside air;
1. An exterior wall structure for a wooden house having an aeration layer, characterized in that it is provided with a ventilation means interposed between the foundation and the foundation of the wooden house to introduce internal air under the floor to the drain.