JP2001227117A - Waterproofing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproofing method offering a sufficient watertightness which can be applied also to a moist backing or the like. SOLUTION: Insulation underlying sheets are laid on the backing requiring waterproof work while butting their joint portions, the sheets are fixed mechanically to the backing at predetermined intervals with a fixing tool, adhesive tape is adhered to the joint portion of the insulation underlying sheet with an interval between the tapes, on which a drippingstop type dry paint film or a dripping-stop type and non-dripping-stop type dry paint film is laminated.

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 roofs of buildings and the like. More specifically, 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 or the like, a method of applying a liquid composition such as a urethane coating waterproofing material to a base surface to form a waterproof coating (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.

[0003] However, a waterproof coating film is formed directly or through a primer on a ground such as mortar or concrete.
In the case of the so-called close contact method, 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 tends to be partially 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 first perform the base adjustment and smooth the base, which increases the construction period. When there is an old coating such as asphalt on the base, it is necessary to peel off the old coating in order to obtain sufficient adhesion between the base and the waterproof coating, which is troublesome. In addition, for the same reason, it can only be applied to a sufficiently dry ground,
Construction sites are limited.

On the other hand, in the case of a so-called ventilation buffer method in which a ventilation buffer 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 method is solved to some extent. it can.

[0005]

However, even in the ventilation buffering method, since it is necessary to attach a ventilation buffer sheet to the foundation with an adhesive, it is not sufficient for young construction of a newly-built 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. Also, when there is an old coating film such as asphalt, it is necessary to peel off the old coating film for the same reason.

On the other hand, as a waterproofing method which can be applied to such a base which could not be conventionally applied, an insulating sheet and a waterproof sheet are laminated on the base in this order, and they are mechanically fixed to the base with a fixture. However, in this method, since the joints between the waterproof sheets were 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 object, the waterproofing method according to the present invention is characterized in that a plurality of insulating subbing sheets are laid and fixed on a base to be waterproofed, with their joints abutting each other. The tape is mechanically fixed to the base at a predetermined interval by a tool, and an adhesive tape is stuck to the joint of the insulating underlay sheet at intervals, and then a waterproof coating material is laminated thereon.

In the present invention, a non-sagging type coating film waterproofing material is used as the coating film waterproofing material, or a non-sagging type coating film waterproofing material and a non-sagging type coating film waterproofing material are used in combination. Is preferred.

[0010] Further, the insulating subbing sheet is a sheet made of a synthetic fiber nonwoven fabric and has a basis weight of 50 to 50%.
The thickness is preferably 500 g / m ² and the thickness is 0.5 to 5 mm.

Further, it is preferable that the insulating subbing sheet is a rubber sheet having a net-shaped groove on one surface, and the rubber sheet is laid so that the surface having the groove is in contact with a base.

According to the present invention, since the adhesion between the base and the insulating underlay sheet is mechanically fixed by a fixture without using a primer or an adhesive, a new smooth base can be easily formed regardless of the state of the base. Can be. Then, by laminating a waterproof coating material thereon, a waterproof layer having high watertightness can be easily formed.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION As an insulating subbing sheet (hereinafter, simply referred to as an underlining sheet) in the present invention, a rubber sheet, a plastic sheet made of polyvinyl chloride or the like,
Examples include a sheet made of a nonwoven fabric or a woven fabric, or a laminate of a nonwoven fabric and a rubber sheet or a plastic sheet.

In the present invention, a rubber sheet or a sheet made of a nonwoven fabric is preferably used from the viewpoints of workability, adhesion to a coating film waterproofing material, and the like.

As the nonwoven fabric, polyester fibers,
Synthetic fiber non-woven fabrics such as polypropylene fiber, polyethylene fiber, nylon fiber and acrylic fiber are preferably used. The sheet made of a synthetic fiber nonwoven fabric has a basis weight of 50 to 500 g / m ² and a thickness of 0.5 to 5 m.
m homogeneous sheets are preferred. By using a sheet made of such a synthetic fiber non-woven fabric, air permeability is ensured, and due to its thickness and cushioning property, even if there are irregularities on the substrate to be waterproofed, a waterproof coating material to be overcoated. Can be finished smoothly.

As the rubber sheet, a sheet made of polymer-modified asphalt rubber, ethylene propylene diene rubber, butyl rubber or the like is preferably used. Further, it is preferable to have a thickness of 0.5 to 3 mm and a net-shaped groove having a depth of 0.2 to 1 mm and a width of 1 to 4 mm on one surface. FIG. 2 shows an example of a rubber sheet used in the present invention. For example, in the rubber sheet shown in FIG. 2A, a plurality of turtle-shaped convex surfaces 6 are arranged in a honeycomb shape, and the gap between the convex surfaces forms a net-shaped groove 5. In the rubber sheet shown in FIG. 4B, a plurality of square convex surfaces 7 are arranged in a grid pattern, and the gaps between the convex surfaces form net-like grooves 5. In the rubber sheet shown in FIG. 1C, a plurality of disk-shaped convex surfaces 8 are arranged in a grid pattern, and the gap between the convex surfaces forms a net-shaped groove 5.

By laying the rubber sheet having the net-shaped groove as described above so that the surface having the groove is in contact with the base, air permeability between the rubber sheet and the base can be ensured.

Examples of the fixing tool used in the present invention include a driving fixing tool such as an anchor pin, a screw, a nail, or the like.

The adhesive tape used in the present invention includes:
There is no particular limitation as long as it can bond the underlay sheet, and examples thereof include an adhesive tape obtained by laminating a film on a polyester nonwoven fabric and further applying an adhesive on the film.

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

It is preferable to use a non-sag type coating film waterproof material or a combination of a non-sag type coating film waterproof material and a non-sag type coating film waterproof material. Then, it is particularly preferable that a non-sag-type waterproof coating film is laminated thereon after coating the non-sag-type waterproof film material.

When the undercoat sheet is a sheet made of non-woven fabric, the non-sag type coating film waterproof material is not impregnated into the entire non-woven fabric even when directly applied, but only the surface layer portion is impregnated. Without compromising breathability,
The nonwoven fabric and the waterproof coating can be firmly bonded.

The anti-sag type coating waterproofing material used in the present invention is JIS-A6021 (roof coating waterproofing material for roof).
In the "Sag resistance performance" test, the sag length is 3.0 mm or less, and the sag length of 1 mm or less is particularly preferably used. Furthermore, JIS-A6
Preferable is a urethane coating waterproofing material that passes "for rising" in No. 021, among which urethane rubber type 1 standard is particularly preferred. As such a drip-proof type urethane coating waterproofing material, for example, urethane waterproofing material for rising,
A commercially available urethane waterproofing material for filling is used.

The non-sag-type waterproof coating material used in the present invention refers to a material having a sag length of more than 3.0 mm, and a sag length of 30 mm or more is particularly preferably used. 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.

In the present invention, it is preferable to further laminate a finishing layer 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.
In addition, a coloring agent, an ultraviolet ray deterioration inhibitor, a matting material, a urethane chip, an aggregate, and the like may be added to these and used appropriately.

The waterproofing method of the present invention can be carried out as follows. a) A plurality of underlay sheets are laid on a base to be waterproofed, such as on a building frame, with their joints abutting each other. When a rubber sheet having a net-shaped groove on one surface is used as the underlining sheet, the rubber sheet is laid so that the surface having the groove is in contact with the base.

By laying such an underlining sheet on a base, it is possible to form a waterproof layer without being affected by the state of the base, and it is possible to ensure air permeability between the base and the waterproof layer. .

B) An adhesive tape is stuck to the joining portion of the underlay sheet at intervals, and the underlay sheets are joined to each other.

At this time, if an adhesive tape is applied to the entire surface of the joining portion of the underlay sheet and joined, the undersheet end is likely to float due to a bouncing habit of the undersheet end, etc.
In addition, the temperature is increased by the pressure (thrust-up) of the moisture of the base water that has been turned into steam with the rise in temperature, and even after the coating film waterproof material is laminated, the portion appears to be swollen in a streak shape, and the appearance is impaired.

Therefore, in the present invention, in order to prevent the above-mentioned state, the joining portion of the underlining sheet is spot-attached with an adhesive tape. Thereby, when the coating film waterproof material is laminated in a later step, the coating film waterproof material enters from the gap of the joint portion of the undercoat sheet other than the point where the adhesive tape is stuck, and adheres to the base, so that the undercoat sheet It is possible to suppress the bouncing habit of the end. In addition, since the coating film waterproof material does not easily enter the joint of the underlay sheet to which the above-mentioned adhesive tape has been spot-attached, the undercoat sheets are not completely interrupted by the paint film waterproof material at the joint portion. Air permeability between them can be secured. For this reason, the underlying water vaporized as the temperature rises is easily discharged into the outside air through the joint of the underlay sheet to which the adhesive tape is spot-attached.

In the present invention, the width is 50 to 100 mm,
Adhesive tape cut to a length of about 100 to 150 mm,
It is preferable to apply a point on the joining portion of the underlining sheet at intervals of 1 to 3 m.

C) A place for hitting the fixing tool for fixing the underlay sheet is determined, drilling is performed, the fixing tool is driven into the hole, and the undersheet is fixed to the base.

In the present invention, it is preferable to fix the sheet by driving a fixing tool into the base at an interval of 1 to 4 pieces / m ² for each sheet. The depth at which the fixture is driven may be appropriately determined depending on the state of the base, but is usually 30 to
70 mm is preferred.

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

D) A coating film waterproof material is uniformly applied on the underlining sheet. Preferably, first, a non-sag type waterproof coating film is laminated, a gap between the surface of the underlay sheet and the joint is sealed, and then a non-sag type waterproof film material is laminated thereon. As a method of applying a coating film waterproof material,
An ordinary method may be employed, and examples thereof include a method of applying with a brush, a wool roller, a mastic roller, a trowel, a rake, or the like, and a method of spraying with an airless or air spray. Preferably, it is preferable to hand-paint with a brush, a wool roller, a mastic roller, a trowel, a rake or the like.

In the present invention, the coating thickness of the waterproof coating material is
1 to 5 mm is preferable, and 2 to 4 mm is particularly preferable. When a non-sag type waterproof material and a non-sag type waterproof material are used together, the total film thickness is 1 to 5 m.
m is preferred.

E) If necessary, a finishing layer is further laminated. In the present invention, it is preferable to further laminate at least one or more finishing layers on the waterproof coating film. For the application of the finishing layer, the above-mentioned usual method can be adopted. Also, this finishing layer has a thickness of 0.05-0.
It is preferably 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 coating film, etc. It is preferably applied to a substrate having a crack or a substrate having a fragile surface.

[0039]

The present invention will be specifically described below with reference to examples and comparative examples. Example 1 Two underlay sheets made of long filament non-woven fabric of polyester filaments having a width (W) of 1 m, a length (L) of 2.5 m, and a thickness of 1.3 mm were laid in parallel on a concrete base having a fragile surface. The two sheets were laid with the joints abutted, but with a gap of about 1 mm. Then
As shown in FIG. 1, it was fixed to the substrate with a fixture (two
m ² , I ₁ = 1 m, I ₂ = 0.6 m). In addition, a 50 mm wide adhesive tape cut to a length of 100 mm was spot-attached to the joined portion of the sheet at an interval of 2 m.

Then, 1.2 kg / m ^{2 of} a non-sag type urethane-based two-pack waterproof material (corresponding to urethane rubber-based Class 1 “for rising” in JIS-A6021) was applied. At this time, the gap generated at the joint was also filled. Then 2
Non-sag type urethane two-pack waterproofing material (J
2.4 kg / m ² of a urethane rubber (Class 1 for IS-A6021 corresponding to “general use”) was applied. Finally, apply an acrylic urethane two-pack type top coat of 0.2 kg / m ²
Applied. The surface of the finished coating film was finished smoothly, and the joints of the sheets were hardly visible.

Comparative Example 1 The same procedure as in Example 1 was carried out except that the entire surface (2.5 m) of the joined portion of the sheet was adhered with an adhesive tape having a width of 50 mm. The finished coating film surface had swollen streaks along the adhesive tape.

Comparative Example 2 As a means for fixing the sheet to the base, instead of the fixture,
A two-part urethane adhesive was applied at a rate of 0.5 kg / m ^2, and the sheet was attached. The finished coating film surface was finished smoothly, and the joints of the sheet were hardly visible, but a layer in which the sheet and the fragile underlayer surface layer having a thickness of about 3 mm were integrated easily peeled off.

[0043]

As described above, according to the waterproofing method of the present invention, the underlay sheet is mechanically fixed to the base with the fixture, so that, for example, a base with a high moisture content or a base with 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.

Then, the underlining sheets are butted and joined, and the joint is spot-adhered with an adhesive tape, so that the coating film waterproof material enters from the joint other than the spot-attached part and can be sealed. Can be easily repaired, and the surface appearance after laminating the coating film waterproof material becomes extremely good.

Furthermore, since the coating film waterproofing material does not easily enter the spot-attached portion, the air permeability of the underlining sheet can be ensured. Therefore, after completing the construction,
Even if the underlying moisture becomes steam and pushes up, it can be ventilated in the underlayer sheet or the space between the underlayer and the underlying sheet and easily released into the outside air via a deaeration cylinder, etc., so that the waterproof layer can be peeled off or blistered. Will not occur.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example when an insulating subbing sheet is fixed in a waterproofing method according to the present invention.

FIG. 2 is a diagram showing an example of a rubber sheet having a net-like groove on one side used in the present invention.

[Explanation of symbols]

1 insulating underlay installation interval of the sheets 2 the adhesive tape 3 fixtures 4 length I ₁ of width L seat groove 6,7,8 convex W sheet joints 5 net-like sheets, I ₂ fixture

Claims (4)

[Claims] 1. A plurality of insulating underlay sheets are laid on a base to be waterproofed, with their joints abutting against each other, and are mechanically fixed to the base at predetermined intervals by a fixing tool. A waterproofing method characterized in that an adhesive tape is stuck to a joint portion at intervals, and then a coating film waterproof material is laminated thereon. 2. A non-sagging type coating film waterproofing material, or a combination of a non-sagging type coating film waterproofing material and a non-sagging type coating film waterproofing material as the coating film waterproofing material. 2. The waterproofing method according to 1. 3. The insulating base sheet is a sheet made of a synthetic fiber nonwoven fabric, and has a basis weight of 50 to 50.
The waterproofing method according to claim 1, wherein the waterproofing method has a thickness of 0 g / m ² and a thickness of 0.5 to 5 mm. 4. The insulating subbing sheet according to claim 1, wherein the insulating sheet is a rubber sheet having a net-shaped groove on one surface, and the rubber sheet is laid so that the surface having the groove is in contact with a base. Waterproof construction method.