JP2001342719A - Waterproofing method for nonwoven fabric sheet underlayer paint film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproofing method applicable to such a substrate as work can not be conventionally carried out and having sufficient water- tightness. SOLUTION: An underlayer sheet made of a synthetic fiber nonwoven fabric with 160 to 320 mm in 0.5 to 5 mm in thickness and JIS-L1096 (45 deg. cantilever method) is laid on the substrate to be made to carry out waterproofing work by overlapping 20 to 100 mm of the joint sections, if favorable, and after it is fixed with an anchor, a paint film waterproofing material is laminated thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproofing method for rooftops of buildings and the like. In more detail, for example, a wet base, a base with an old coating film such as asphalt, a base with unevenness or cracks, etc., which cannot be applied by the conventional method or require some base adjustment The present invention relates to a waterproofing method that can be applied to various types of substrates.

[0002]

2. Description of the Related Art As one method of waterproofing a rooftop of a building, a method of forming a waterproof coating by applying a liquid composition such as a urethane coating waterproofing material to a substrate surface (hereinafter referred to as a coating waterproofing method). Is known). According to this coating film waterproofing method, it is possible to easily form a waterproof layer having high watertightness, which is seamless over the entire surface.

However, in the case of a so-called close contact method in which a waterproof coating film is formed directly on a lower surface of a mortar, concrete, or the like via a primer, there are the following problems. When base moisture evaporates due to a rise in temperature, it cannot escape into the open air. Therefore, the waterproof coating is pushed up by the moisture, and the waterproof coating swells. Since the waterproof coating is directly subjected to the stress of the base such as movement of joints, the waterproof coating is easily peeled or broken. If there is unevenness or cracks on the base, a waterproof coating film having a uniform thickness cannot be obtained, so that the durability of a portion where the waterproof coating film is thin decreases. For this reason, it is necessary to adjust the background first to smooth the background, which increases the construction period. When there is an old paint film such as asphalt on the base material, it is necessary to remove the old paint film in order to obtain sufficient adhesion between the base material and the waterproof paint film, which is troublesome. Further, for the same reason, the work can be performed only on a sufficiently dried base, and the construction site is limited.

On the other hand, in the case of a so-called ventilation cushioning method in which a ventilation cushioning sheet having air permeability and cushioning property is adhered to a base with an adhesive and a waterproof coating film is formed thereon, the above-mentioned problem of the close contact construction method is solved to some extent. it can.

[0005]

However, even in the ventilation cushioning method, since the ventilation cushioning sheet needs to be applied to the foundation with an adhesive, it is not sufficient for young concrete of a new building or a foundation containing a large amount of moisture after rainfall. It has not been possible to obtain a high adhesive strength and has not been applied until now. In addition, even when there is an old coating film such as asphalt, for the same reason, it is necessary to peel off the old coating film and perform the application.

On the other hand, as a waterproofing method which can be applied also to such a substrate which could not be applied conventionally, there is an insulating waterproofing method in which an insulating sheet and a waterproof sheet are laminated on the substrate in this order, and they are driven into and fixed to the substrate with fixing brackets. However, in this method, since the joints between the waterproof sheets and the like are joined with an adhesive, sufficient watertightness could not be secured as compared with the above-mentioned coating film waterproofing method.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a waterproofing method which can be applied to a substrate which could not be applied conventionally and has a sufficient watertightness.

[0008]

In order to achieve the above-mentioned object, the waterproofing method of the present invention is applied to a base material to be waterproofed, having a thickness of 0.5 to 5 mm and a rigidity of JIS-L1096 (45).
(゜ Cantilever method) Underlay sheet made of synthetic fiber non-woven fabric of 160 to 320 mm in thickness, fixed with fixtures, and then laminated with a waterproof coating material on the non-woven sheet. It is.

In the present invention, a plurality of the underlay sheets are laid such that their joint portions are overlapped by 20 to 100 mm, and the overlapped portions are fixed with a fixture.
It is preferable that a waterproof coating material is laminated thereon.

It is preferable that a first-layer waterproof film is laminated on the first layer as the waterproof film, and then a non-dry-type waterproof film is laminated.

Further, it is preferable that the coating waterproofing material is a urethane coating waterproofing material.

According to the present invention, since the bonding between the base and the insulating subbing sheet is mechanically fixed by a fixture without using a primer or an adhesive, for example, a base having a large amount of water or a base having insufficient adhesiveness can be used. In addition, the waterproofing of the coating film can be performed without being substantially affected by the surface condition of the base. Further, since the labor and time for the base adjustment as in the related art are not required, the construction period can be significantly reduced.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION As a base sheet in the present invention, a synthetic fiber non-woven fabric such as polyester fiber, polypropylene fiber, polyethylene fiber, nylon fiber and acrylic fiber can be used. Also, its thickness is 0.
5 to 5 mm, preferably 1 to 3 mm.

In the present invention, polyester fibers are preferred from the viewpoints of adhesion to a waterproof coating material, solvent resistance and dimensional stability. Preferably, the polyester nonwoven fabric is impregnated with a binder such as an acrylic resin and dried and cured, and has a mass per unit area of 50 to 500 g / m ² . The rigidity is 160-320mm (JIS-L10
96 (45 ° cantilever method), and so forth. ) Range. In the present invention, the stiffness of this synthetic fiber nonwoven fabric is particularly important, and when the stiffness is less than 160 mm, wrinkles may occur when fixed with a fixing tool, and are susceptible to irregularities and steps on the base. It is not preferable because the coating film waterproof material laminated thereon is difficult to control to a uniform thickness and it is difficult to finish smoothly. On the other hand, rigidity is 3
When the thickness exceeds 20 mm, winding wrinkles and folding wrinkles are likely to be generated on the sheet, and when the sheet is laid on the base, the wrinkles remain, so that even if a coating film waterproof material is applied, it cannot be finished smoothly, which is not preferable.

In the present invention, the underlay sheet is preferably a single layer of the synthetic fiber non-woven fabric,
A composite nonwoven fabric sheet obtained by attaching a rubber sheet, a vinyl chloride sheet, or the like to the synthetic fiber nonwoven fabric with an adhesive, or heat-sealing through a polyolefin film has a coefficient of thermal expansion of each layer and a swelling rate with a solvent. Since they are different, distortion occurs, and wrinkles easily occur, which is not preferable.

The fixing tool used in the present invention includes a driving fixing tool such as an anchor pin, a screw, or a nail.

The waterproof coating material used in the present invention includes:
Examples include urethane coating waterproofing materials, acrylic rubber-based waterproofing materials, and rubber asphalt-based waterproofing materials. Among them, a urethane coating waterproofing material is preferably used.

The urethane coating waterproofing material is a urethane-based material which can be cured to form a coating, and a known polyurethane coating waterproofing material can be used. The sagging-proof waterproofing material has a sagging length of 3.0 mm in a “sagging resistance performance” test in JIS-A6021 (a waterproof coating material for a roof).
The following are preferred, and those having a sag length of 1 mm or less are particularly preferably used. Further, those which pass "for rising" in JIS-A6021, especially urethane coating waterproofing materials which pass urethane rubber type 1 standard are preferable. Examples of such a non-sag type urethane coating waterproofing material include those commercially available as a rising urethane waterproofing material and a filling urethane waterproofing material.

The non-sag-resistant coating film waterproofing material used in the present invention refers to a material having a sag length of more than 3.0 mm, particularly preferably a sag length of 30 mm or more. Further, those which pass "general use" in JIS-A6021, especially urethane coating waterproofing materials which pass urethane rubber type 1 standard are preferable. As such a non-sagging type urethane coating waterproofing material, there is, for example, a commercially available urethane waterproofing material for flat use.

The waterproofing method of the present invention can be implemented as follows. a) A plurality of underlay sheets are provided on a foundation to be waterproofed, such as on a building frame, and their joints are set to 20 to 100 mm.
More preferably, they are laid so as to overlap each other by 50 mm. By laying such an underlay sheet on a base, a waterproof layer can be formed without being affected by the state of the base, and air permeability between the base and the waterproof layer can be secured.

B) A place for hitting a fixture for fixing the underlay sheet is determined on the overlapped portion, and a hole is drilled with a drill, a driving fixture is driven into the hole, and the undersheet is fixed to the base. In the present invention, it is preferable that a fixing tool is driven into the base at an interval of 300 to 600 mm (1.6 to 3.3 / m ² for each sheet) on the overlapped portion, and the sheet is fixed to the base. The depth of the fixing tool may be appropriately determined depending on the condition of the base, but is preferably 30 to 70 mm.

As described above, since the underlay sheet is fixed to the base with the fixture, even if the base has some irregularities, it is not necessary to adjust the unevenness, and the base including a large amount of water can be applied as it is. .

C) A coating film waterproof material is evenly applied on the underlining sheet. In the present invention, as the coating film waterproofing material, a first-layer non-stick type coating film waterproofing material is applied to the entire underlayer sheet so as to have a uniform thickness, and after the anti-sagging type coating film waterproofing material is cured. It is preferable to apply a non-sagging type waterproof coating film on the second and subsequent layers in one or two coatings so as to have a uniform thickness. The total coating thickness of the waterproof coating material is preferably 2 mm or more.

The anti-sag type coating film waterproofing material also has the purpose of filling the superposed portion of the underlay sheet and reducing the level difference, and impregnates only the surface portion without directly impregnating the entire nonwoven fabric even when directly applied. Therefore, the nonwoven fabric and the waterproof coating film can be firmly bonded without impairing the air permeability of the nonwoven fabric.

As a method for applying the coating film waterproofing material, an ordinary method may be adopted, for example, by applying with a brush, a wool roller, a mastic roller, a trowel or a rake, or by airless or air spray. There is a method of spraying. In the present invention, it is preferable to hand-coat with a brush, a wool roller, a mastic roller, a trowel or a rake.

D) If necessary, a finishing layer is further laminated. In the present invention, it is preferable to laminate at least one or more finishing layers on the waterproof coating material. As the finishing layer, an acrylic urethane-based two-pack type top coat, a fluororesin-based two-pack top coat, or the like is used. Further, a coloring agent, an ultraviolet absorber, a matting material, urethane chips, an aggregate, and the like may be added to these and used as appropriate.

For the application of the finishing layer, the above-mentioned usual method can be adopted. This finishing layer has a thickness of 0.0
It is preferably from 5 to 0.3 mm. By laminating such a finishing layer, the durability of the waterproof coating film can be improved and the appearance can be beautiful.

According to the waterproofing method of the present invention, there are young concrete of a newly-built building, a base containing a large amount of water after rain, an old paint film, etc. It is preferably applied to a substrate having a crack or a substrate having a fragile surface.

[0029]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples and Comparative Examples. In each example, the following underlining sheets were used.

(Example 1) Acrylic resin-impregnated polyester nonwoven fabric having a mass of 300 g / m ² , a thickness of 2.5 mm, and a rigidity of 180 mm.

(Example 2) An acrylic resin-impregnated polyester nonwoven fabric having a mass of 230 g / m ² , a thickness of 1.3 mm, and a rigidity of 280 mm.

Comparative Example 1 An acrylic resin-impregnated polyester nonwoven fabric having a mass of 180 g / m ² , a thickness of 1.3 mm, and a rigidity of 340 mm.

(Comparative Example 2) A polyester nonwoven fabric having a mass of 330 g / m ² , a thickness of 3.0 mm, and a stiffness of 120 mm.

Comparative Example 3 A polyester nonwoven fabric having a mass of 160 g / m ² and a thickness of 1.5 mm, a thickness of 2
A 0 μm polyethylene film and a nonwoven polyester nonwoven fabric having a mass of 30 g / m ² and a thickness of 0.2 mm are laminated in this order from the bottom and heat-fused to form a rigid and soft 90 mm 3.
Layer composite sheet.

(Comparative Example 4) A non-vulcanized rubber sheet having a thickness of 0.5 mm, a weight of 30 g / m ² and a thickness of 0.1 g / m ² .
A rigid and flexible 80 mm two-layer composite sheet obtained by laminating a 2 mm polyester nonwoven fabric, heat-sealing the rubber, and vulcanizing the rubber.

After the above-mentioned six types of subbing sheets were wound around a roll core having a diameter of 100 mm and allowed to stand for 7 days, the same method as in Examples and Comparative Examples was applied in the following manner. Table 1 shows the construction conditions at that time.

Two underlay sheets each having a width (W) of 1 m and a length (L) of 2.6 m are superposed on a concrete base having an uneven surface having a surface roughness of about 5 mm so that the joint (I ₂ ) thereof is overlapped by 50 mm. It was laid in parallel. Next, as shown in FIG. 1, it was fixed to the base with a fixture (I ₁ = 0.5 m).

Then, 1.2 kg / m ^{2 of a} non-drip type urethane-based two-component waterproof material (corresponding to urethane rubber-based class 1 in JIS-A6021) was applied. An ordinary urethane two-pack type waterproof material was applied thereon at 2.4 kg / m ² . Finally, an acrylic urethane two-pack type top coat was applied at 0.2 kg / m ² .

[0039]

[Table 1]

[0040]

As described above, according to the present invention,
Since the underlay sheet is fixed to the substrate with the fixture, the waterproofing of the coating film can be performed with almost no influence on the surface condition of the substrate such as the substrate with much moisture or the substrate with insufficient adhesion. Since the labor and time for the base adjustment are not required, the construction period can be significantly reduced.

Furthermore, even after the construction is completed, even if the water content of the base material becomes steam and pushes up, it is easily ventilated through the nonwoven fabric layer of the base sheet or the space between the base sheet and the base sheet, and is easily exposed to the outside air via a degassing cylinder. The waterproof layer is not peeled off or swelled.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a waterproofing method according to the present invention when an underlay sheet is fixed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Underlay sheet 2 Fixture 3 Sheet joint W Sheet width L Sheet length I ₁ Fixture installation interval I ₂ Sheet overlap width

Claims (4)

[Claims] 1. A base material to be waterproofed, having a thickness of 0.5 to
Underlay sheet made of synthetic fiber non-woven fabric of 5 mm and stiffness of JIS-L1096 (45 ° cantilever method) of 160 to 320 mm is laid, fixed with fixtures, and laminated with a waterproof coating material. The nonwoven fabric sheet undercoat waterproofing method. 2. A plurality of said underlay sheets, their joints are laid by overlapping by 20 to 100 mm, and the overlapped portion is fixed with a fixture, and then a waterproof coating material is laminated thereon. The method for waterproofing a nonwoven fabric sheet undercoat according to claim 1. 3. The nonwoven fabric according to claim 1 or 2, wherein a non-skid type coating film waterproof material is laminated on the first layer, and then a non-sag-resistant type coating film waterproof material is laminated as the coating film waterproof material. Sheet undercoat waterproofing method. 4. The method according to claim 1, wherein the waterproof coating is a urethane waterproof coating.