JPH05306551A - Vent sheet structure for construction - Google Patents

Abstract

PURPOSE:To improve the air leakage characteristics of a space of an attic to achieve effective utilization of the space in a building by filling water absorbable macromolecular resin into between two vent sheets having a water repelling property and water vapor permeability. CONSTITUTION:Adhesives are applied to a vent sheet 1 having an air-stream isolating property, water repelling property, and water vapor permeability and water absorbable macromolecular resin powder 2 is uniformly spread thereon by a proper method and the vent sheet 1 is superposed thereon to form a vent sheet structure 5. Thereafter, the structure 5, together with a roof material 6, is fixed onto a roof board 4 provided on a rafter 3 by means of nails 7. And when stormwater penetrates into the structure 5 through nail holes for fixing the structure 5, the powder 2 expands into a gel state, thereby blocking the nail holes, so that the stormwater is prevented from getting into a building.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation sheet having windproofness, water repellency (waterproofness) and moisture permeability, and more particularly to a ventilation sheet structure for house construction used for preventing dew condensation in a wooden house.

[0002]

2. Description of the Related Art A ventilation sheet having windproofness, water repellency and moisture permeability is attached to the outside of a heat insulating material provided on a wall of a wooden house to prevent the entry of wind and rain into the room and to escape the water vapor inside the room. The building structure is being implemented to prevent dew condensation in the wall structure, to maintain ventilation in the room, and to prevent deterioration of structural materials.

In addition, asphalt felt is provided on the roof surface of a wooden house to prevent rainwater from entering. Since this asphalt felt is fixed to the roof surface with nails or the like, there is a hole in the felt sheet, but as the asphalt melts part of the asphalt due to solar heat and blocks the nail hole, water leakage from this nail hole is prevented.

On the other hand, in order to effectively use the space in the building, there is an increasing demand for using the space portion of the attic as a room.

[0005]

However, in the conventional structure of the roof portion on which the asphalt felt is pasted, since the asphalt felt has no air permeability, heat and humidity are used and the attic portion is used in the same condition as in a normal room. I couldn't.

When the ventilation sheet provided on the wall surface of the building is simply stuck to the roof surface instead of the asphalt felt, rainwater flowing on the roof surface may be a nail or a gun tacker for fixing the sheet. It may penetrate into the interior through the holes and cause the structural material to rot or to leak rain. Therefore, the conventional ventilation sheet cannot be attached to the roof surface, so that the attic space cannot be effectively used.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and provides a ventilation sheet structure for house construction having windproofness, waterproofness, and moisture permeability that can be used not only on a wall surface but also on a roof surface. For the purpose of provision.

[0008]

In order to achieve the above object, in the present invention, a water-absorbent polymer resin is filled between two ventilation sheets having water repellency and moisture permeability.

[0009]

When rainwater enters the ventilation sheet through the nail holes for fixing the sheet, the water-absorbent polymer resin swells like a gel to block the nail holes and prevent rainwater from entering the building.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A is a sectional view of a ventilation sheet structure according to an embodiment of the present invention. The air-permeable sheet structure 5 is formed by filling the water-absorbent polymer resin powder 2 between two air-permeable sheets 1 having windproof property, water repellency and moisture permeability. As the ventilation sheet 1, a material obtained by subjecting polyethylene continuous ultrafine fibers to high pressure processing, for example, Tyvek (registered trademark, DuPont) is used. As the water-absorbent polymer resin, a super-water-absorbent polymer that absorbs water and swells into a gel, for example, a vinyl acrylate copolymer is used. Such a breathable sheet structure 5 is formed by, for example, applying an adhesive to the breathable sheet 1, and then uniformly spraying the water-absorbent polymer resin powder 2 on the breathable sheet 1 by an appropriate method and stacking the breathable sheet 1 thereon. To do. Instead of using the adhesive, a coarse non-woven fabric or the like may be provided on the ventilation sheet 1 and the resin powder may be evenly dispersed on the non-woven fabric.

FIG. 1B is a sectional view of a ventilation sheet structure according to another embodiment of the present invention. In this embodiment, instead of the water-absorbing polymer resin powder 2 of the above-mentioned embodiment, a water-absorbing sheet 8 such as a nonwoven fabric, a non-woven paper or a fiber woven fabric made of a water-absorbing polymer resin is provided between the two ventilation sheets 1. The air-permeable sheet structure 5 is formed by interposing such a three-layer laminated sheet structure.

An example of using the ventilation sheet structure 5 is shown in FIG. The figure shows a roof structure, in which a ventilation sheet structure 5 according to the present invention is provided on a base plate 4 provided on a rafter 3.
The ventilation sheet structure 5 is fixed to the base plate 4 together with the roof member 6 with nails 7 (or a gun tacker or the like).

In such a roof structure, rainwater entering the interior of the roof material 6 flows along the roof slope due to the water repellency of the ventilation sheet 1 on the upper surface of the ventilation sheet structure 5. When rainwater enters the inside of the ventilation sheet fixing nail 7, the water is absorbed by the superabsorbent polymer of the ventilation sheet structure 5 and swells to block the space around the nail 7 into the rainwater building. Prevent intrusion. The absorbed moisture evaporates with time and is again released to the outside through the upper ventilation sheet 1, and the water-absorbent polymer resin returns to its original state.

As described above, the present invention is characterized by the structure in which the water absorbent material is sandwiched between the two ventilation sheets. In contrast to this, it is not preferable to use a structure in which only one air-permeable sheet is used and a water-absorbent sheet is attached to one surface thereof for the following reasons.

First, when the ventilation sheet is arranged on the lower side, the water absorbent sheet is exposed on the entire upper surface, so that rainwater entering through the gap of the roof material does not flow along the slope of the roof and is completely absorbed by the water absorbent sheet. It will be absorbed. Therefore, the absorption capacity of the water absorbent sheet may be saturated, and water may enter the inside of the building through the nail holes of the lower ventilation sheet.

On the other hand, when the ventilation sheet is arranged on the upper side, the water-absorbent sheet comes into direct contact with the building structural material such as the ground plate, so that the water-containing water-absorbing sheet corrodes the structural material and the building material is corroded. Deterioration is accelerated.

According to the ventilation sheet structure of the present invention, since the water absorbent material is sandwiched between the two ventilation sheets, such a problem does not occur.

[0018]

As described above, in the present invention, since the water-absorbent polymer resin is filled between the two ventilation sheets, it can be easily carried out without causing problems such as rain leakage and corrosion of structural members. The ventilation sheet structure can be attached to the roof surface. Therefore, the air permeability of the attic space is improved, the room can be used as a normal room, and the space in the building can be effectively used.

The ventilation sheet 1 is not limited to the above-mentioned product Tyvek (registered trademark, DuPont), but other suitable ventilation sheet materials or the above-mentioned products can be used in consideration of the use situation, economy, color and transparency. A breathable film material or cloth material having the same characteristics as the example may be used.

[Brief description of drawings]

1 (A) and 1 (B) are cross-sectional views of different examples of a ventilation sheet structure for a house according to the present invention.

FIG. 2 is an explanatory view showing a state where the ventilation sheet structure for a house building according to the present invention is used for a roof portion.

[Explanation of symbols]

 1 Venting sheet 2 Water-absorbent polymer resin powder 5 Venting sheet structure 6 Roofing material 7 Nails 8 Water-absorbing sheet

Claims (1)

[Claims] 1. A ventilation sheet structure for a house construction, wherein a water-absorbent polymer resin is filled between two ventilation sheets having water repellency and moisture permeability.