JPS62296048A - Construction method of roof substrate material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a method for constructing roof under-roofing materials.

[Background of the invention]

Traditionally, asphalt ruling 2 was used on the roofs of ordinary houses.
It is common for 2 kg products to be laminated in one layer.

In high-end homes, two layers of 22 kg asphalt ruling are installed to further increase reliability of waterproof properties. That is, the inner layer is laid on the sheathing board with a certain overlapping allowance, and the outer layer is laid on the top surface with a staggered overlapping allowance.

This 22 kg product of asphalt ruling is made by applying blown asphalt mixed with filler to both sides of base paper that has been fully impregnated with straight asphalt or pitch, and using minerals such as talc and silica sand to prevent the applied layer from sticking. Powder particles were spread over the entire surface. Asphalt has excellent water resistance and durability due to its own hydrophobicity and high rot resistance, but during high temperatures in the summer, the coating layer softens and leaves footprints, which can damage other parts such as roof finishing materials. May get dirty with asphalt.

In addition, because it lacks low-temperature properties, it becomes brittle in the winter, prone to cracks at bent parts, and has poor sealing properties for nail holes created by nails used to secure roofing materials, etc. There were problems with water leakage and temperature differences between indoors and outdoors, causing water vapor to condense on the roofing surface, causing the roofing boards to rot over time. It was thought that these problems could be improved to some extent by using two layers compared to single layer, and the reliability would also be improved.

However, even if the asphalt roofing was applied in two layers, the above-mentioned cracks would occur in the asphalt roofing itself, the sealing properties of nail holes would still be poor, and condensation would still occur, and it would not be possible to prevent water leakage and rot of the roofing boards. .

[Purpose of the invention]

This invention is intended to solve the above-mentioned problems, and aims to provide a new construction method in which the inner layer has dew-proofing properties, and the outer layer has functions of preventing cracks and sealing nail holes.

[Structure of the invention]

In order to achieve the above object, the present invention includes asphalt felt on the roofing board, and asphalt roofing containing styrene-butadiene-styrene block copolymer (hereinafter referred to as SBS) on the top surface of the asphalt felt, with the overlapping margins of the two being shifted. The main idea is to use a two-layer adhesive.

〔Example〕

Next, the present invention will be described based on embodiments shown in the accompanying drawings.

In the figure, ■ is a field board, 2 is the field Fj, and asphalt felt pasted on the field Fj, 1 with a constant overlap margin 3. Asphalt Felt 2 is made by impregnating paper made from waste paper, valves, defibrated cotton rags, wool waste, etc. with asphalt.

It has water absorption and dehumidification properties, as well as high rot resistance. The overlapping allowance 3 is 10 mm for asphalt felt with a width of 1 m.
It takes about a country.

4 is an overlapping allowance 3 on the top surface of the asphalt felt 2.
As shown in the second figure, the SBS-containing asphalt roofing is laminated and pasted with the overlapping allowance 5 shifted, and the SBS-containing asphalt layers 42 and 42' are applied on both sides of the base paper 41 impregnated with asphalt. , mineral powder particles 43, 43' are sprinkled on their outer surfaces. This SBS-containing asphalt layer 42, 42' is composed of asphalt itself mixed with, for example, 5 to 20% SBS. The base asphalt of this SBS-containing asphalt may be straight asphalt or blown asphalt.

In addition, fillers such as talc and slaked lime may be added to the SBS-containing asphalt layer 42.42', which is excellent in improving brittleness at low temperatures and wobbling at high temperatures. Improving sex.

It has significantly improved mechanical strength at high temperatures, and when constructing pitched roofs under the scorching summer sun, it will not stretch or sag under the weight of the builder.

It is highly elastic and has excellent needle hole sealing properties.

The reason why the SBS content was set at 5 to 20% is that if it is less than 5%, it will lack low-temperature bending durability and mechanical strength at high temperatures, and it will not be able to provide nail hole sealing properties. This is because the cost becomes high and it cannot be put to practical use. Note that the SBS-containing asphalt roofing 4 has an SBS-containing asphalt layer 42 to further increase its mechanical strength.
．． A layer made of synthetic fiber or glass fiber (for example, glass, woven fabric such as cheesecloth made of polyester, net-like laminate, polypropylene cloth, vinylon, polyester, etc.) is applied to the base paper 1 before coating 42'. cloth).

Alternatively, a material bonded with a synthetic resin film having excellent mechanical strength may be used.

〔Effect of the invention〕

As described above, the method for constructing a roof under-roofing material according to the present invention is as follows: asphalt felt is placed on the roofing board, and asphalt roofing is placed on the top surface of the asphalt felt, with the overlap between the two. Since the method of the present invention is characterized by applying two layers of asphalt rulers in a staggered manner, the method of the present invention is superior to the conventional method of applying two layers of asphalt rulers weighing 22 kg.

■Function (a) Dew-proofing In the present method, moisture that condenses on the roofing surface is absorbed by the felt surface and dehumidified when the atmosphere becomes dry, so the roofing boards are not damaged.However, in the conventional method, moisture that condenses on the roofing surface is absorbed by the felt surface. As a result, the roof boards rot over time.

(b) Nail hole sealing property The rubberized asphalt layer of the rubberized asphalt roofing, which is the outer layer in the present method, has rubber elasticity and has a packing effect, so the sealing performance is very high.
Because the product uses blown asphalt, it is brittle.
Because it is hard, it cannot be expected to seal the nail hole.

Currently, there is a conventionally constructed product in which two layers of asphalt ruler (22kg) are nailed to a 12N thick plywood board as a base, a 20kg asphalt (20kg) product with a plywood board of the same thickness as the base, and asphalt roofing with SBS. (Asphalt Ruler 22k
The construction product of the present invention is prepared by using the base material of product g as a base material, and applying a coating layer of SBS-containing asphalt to make the total thickness 1 layer, and pasting it in two layers by nailing.
50n was applied and the presence or absence of water leakage was checked after 24 hours, and the results shown in the following table were obtained.

(C1 Low-temperature properties The SBS-containing asphalt roofing used in the present method does not lose its rubber elasticity even at low temperatures, and does not bend or
There are no 9 cracks.

Roofing used in conventional methods becomes brittle at low temperatures, causing it to break, break, and crack during construction.

Now, we measured the temperature at which cracks would not occur when a conventional asphalt ruler 221r product and asphalt roofing with SBS were wrapped around a mandrel with a diameter of 5 cranes at a speed of 180°/2 seconds at intervals of 5"C. By the way.

The results shown in the following table were obtained.

■Construction The proposed method does not leave footprints and is not sticky even during construction under high temperatures in summer, but the roofing layer used in the conventional method has a soft coating layer.

There is a risk of leaving footprints and staining other parts such as roof finishing materials with asphalt.

■Reliability of waterproofing As shown in (b) and (1-) of ■ above, the present method has very high reliability against water leakage, but even with the conventional method, even with two layers, the asphalt ruler is 22 kg. It is not sufficient because it does not eliminate the defects of the product itself.

■Economy In the present method, asphalt ruling by the conventional method is 22 kg.
Although it is superior in terms of single-function construction compared to the conventional two-layer adhesive, the cost is almost the same, and it is highly economical when considering long-term usability.

[Brief explanation of the drawing]

The figures show an embodiment of the invention, with FIG. 1 being a schematic sectional view of a roof, and FIG. 2 being an enlarged sectional view of an asphalt roofing containing SBS. 1-・Sheet board 2-・-Asphalt felt 3.5・-Overlapping allowance 4-3 B S asphalt roofing 41・-
Base paper 42.42' - Asphalt layer with SBS Figure 2 December 3, 1985

Claims (2)

[Claims] (1) A roof underside characterized by asphalt felt on the roof board, and asphalt roofing containing styrene-butadiene-styrene block copolymer applied on the top surface of the asphalt felt, with the overlapping margins of both staggered to form a two-layered structure. Construction method for roofing materials. (2) The styrene-butadiene-styrene block copolymer-containing asphalt roofing is coated on both sides of the asphalt-impregnated base paper.
2. The method for constructing a roof under-thatching material according to claim 1, wherein asphalt layers containing styrene block copolymer are laminated and mineral powder particles are sprinkled on the outer surface.