JPH0621510B2 - Insulation and waterproofing method on the roof of the building - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat insulating and waterproofing method on a rooftop of a building, and more particularly to a method for constructing a rooftop structure of a building having a preventive layer on a heat insulating layer.

[Conventional technology]

In order to waterproof the roof of a concrete building, a method of placing a sheet on the upper surface of slab concrete and placing a holding concrete on the upper surface has been widely used. With this method, water may leak due to cracks in the holding concrete, and recently, a waterproof method for attaching a waterproof sheet has become widespread in view of high waterproof performance, excellent weather resistance, and weight reduction.

In this method, the base is repaired by smoothing the surface of the base, and after cleaning, a primer is applied. Then, the sheet is temporarily laid according to the allocating line and aligned, and then the sheet joining surface is heat-welded and finished by pressing the roller to complete the work.

Further, in recent years, in order to maintain the heat insulation performance on the roof of a building, for example, a square heat insulating material having a predetermined thickness is laid on the entire upper surface of the slab concrete, and a waterproof material is attached to the surface of the heat insulating material.

[Problems to be Solved by the Invention]

In the method of attaching the waterproof sheet described above, a step is formed at the joint between the waterproof sheets 71 and 72 as shown in FIG.
Not only is it aesthetically unpleasant, but if there is a mistake in the alignment width of the overlapping part at the edge of the sheet, it will not be possible to attach the sheets in parallel. The pedestrian may damage the joint and cause water leakage.

On the other hand, in the conventional heat insulating and waterproofing method using the above heat insulating material, resin foam such as styrene resin is used as the heat insulating material. However, these resin foams have a structure with a lot of internal bubbles from the viewpoint of the heat insulating effect. Have For this reason, a metal plate such as an iron plate is used as the waterproof material attached to the upper surface of the heat insulating material in terms of strength.

However, since a metal plate such as an iron plate is heavy in weight, not only the work efficiency of waterproofing work is lowered, but also a gap between the metal plates needs to be filled with a waterproof material, and this work requires a great deal of skill.

An object of the present invention is to solve the above-mentioned problems of the prior art, to have a high work efficiency, to prevent a step from occurring at the joint of the waterproof sheet, to have an excellent appearance, and to prevent the waterproof sheet from being damaged by a pedestrian. An object of the present invention is to provide a construction method capable of obtaining a heat-insulating and waterproof structure on a roof of a building.

[Means for Solving the Problems]

The above-mentioned purpose is to install the heat insulating material laid on the slab concrete surface on the roof of the building on the side opposite to the laying surface in the thickness direction (that is,
The waterproof sheet surface side) has a structure with a lower porosity, and a first step portion is formed on the upper surface of the heat insulating material at the end portion of one of the waterproof sheets, and a first step portion is formed at the end portion of the other waterproof sheet. A second step portion that is engageable and has a substantially similar shape and has a width shorter than the first step portion is formed, and a joining surface is provided when the first step portion and the second step portion are superposed or abutted. This is achieved by a method of joining with an adhesive or a welding agent and interposing an adhesive or a welding agent in the void portion caused by the difference in width between the first step portion and the second step portion.

[Action]

The heat insulating material laid on the upper surface of the slab concrete has a predetermined porosity, and the heat insulating effect is maintained. Also, since the upper surface side of the heat insulating material (the surface side to which the waterproof sheet is attached) has a low porosity and high strength, it is possible to work with vinyl chloride resin etc. without using a metal plate etc. that reduces work efficiency as a waterproof sheet. A resin sheet having good properties can be adopted.

Since the waterproof sheet does not have a step on the sheet joining surface, the conventional problems due to the step are eliminated.

When the waterproof sheet expands or contracts due to changes in the outside temperature, it is absorbed by the adhesive or welding agent that is present in the gap between the steps of both waterproof sheets, so there is no gap between both waterproof sheets. The waterproof function can be reliably maintained.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing a partial cross section of a heat insulating and waterproof structure according to the construction method of the present invention. In FIG. 1, a square heat insulating material 2 is laid on the surface of slab concrete 1.
As shown in FIG. 2, the heat insulating material 2 has a large porosity on the surface side of the slab concrete 1 (the bottom surface side and is indicated by A in the drawing), and the surface to which the waterproof sheets 3A and 3B are attached (upper surface side). And the porosity (indicated by B in the figure) is small. Therefore, when the heat insulating material 2 is formed of the same component, the upper surface side is less flexible and has a structure in which deformation due to pressing from the upper portion is extremely small. In this heat insulating material 2, if the portion on the low porosity side is formed in a layered form and the part on the high porosity side is formed in a layered manner and they are joined together, the heat insulating material 2 can be easily manufactured. Can be one.

Moreover, since the heat insulating material 2 maintains a sufficient porosity in the entire thickness direction, the heat insulating performance is not impaired.

Such a plurality of heat insulating materials 2 is the slab concrete 1
After being laid over the entire upper surface of the heat insulating material 2, the waterproof sheets 3A, 3B ... Are attached to the upper surface of the heat insulating material 2 with an appropriate bonding material. As shown in FIG. 3, each waterproof sheet is formed with step portions 4 and 5 having similar shapes to each other, and as shown in the figure, both are joined to form a waterproof layer.

As a means for joining the waterproof sheets 3A and 3B shown in FIG. 3, for example, a method of joining the joining surfaces with an adhesive, a method of joining the joined portions by heat welding, or the like can be adopted.

In FIG. 3, the step portion 4 on the side of the one waterproof sheet 3A is shown.
Is made smaller than the width of the stepped portion 5 of the other waterproof sheet 3B to form a concave portion (void portion) when the two are superposed, and the concave portion (void portion) is made of thermoplastic resin. A heat-welding agent such as resin or the adhesive 7 is interposed.

In this embodiment, the expansion / contraction of the waterproof sheets 3A and 3B due to a change in the outside temperature is absorbed by the heat-sealing agent or the adhesive 7 such as a thermoplastic resin interposed in the recesses (voids). Since there is no gap in the joint surface of the stepped portions 3A and 3B, water leakage can be reliably prevented.

Further, FIG. 4 shows a method of attaching the reinforcing tape 6 to the back surface and / or the front surface of the joint portion of the waterproof sheets 3A and 3B. When the reinforcing tape 6 is arranged on the back surface as shown in the figure, it is not necessary to consider the color of the tape, but when the reinforcing tape 6 is attached on the front surface, whether the color of the reinforcing tape 6 corresponds to the color of the waterproof sheets 3A and 3B. Or, it is desirable to use a transparent tape. The reinforcing tape 6 can be attached to the waterproof sheet by an adhesive instead of an adhesive.

In order to form a stepped portion as shown in the figure on the edge of the waterproof sheet, a means for pressing the edge of the sheet with a roller having irregularities having a shape corresponding to the shape of the step or grinding with a drum cutter Alternatively, one of the two sheets may have a width shorter than the other so that a stepped portion is formed between the two sheets in the manufacturing stage in which the two sheets are laminated.

〔The invention's effect〕

As described above, according to the present invention, it is possible to maintain a desired heat insulation performance on the roof of a building, and there is no step at the end joint portion of the waterproof sheet, which is aesthetically pleasing and eliminates the risk of water leakage from the joint portion. At the same time, there is no risk of pedestrians damaging the joints, and higher work efficiency can be obtained during construction compared to conventional construction methods.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing a heat insulation and waterproof structure by a construction method of the present invention in a partial cross section, and FIG. 2 is an enlarged perspective view of the heat insulating agent in FIG. 1, FIGS. Each of the drawings is a cross-sectional view showing an example of joining the waterproof sheets in the structure of FIG. 1, and FIG. 5 is an explanatory view showing an example of joining conventional waterproof sheets. 1 ... Slab concrete, 2 ... Insulation material, 3A, 3B ... Waterproof sheet, 4, 5 ... Step portion, 6 ... Reinforcing tape, 7 ... Adhesive.

Claims (1)

[Claims] 1. A slab concrete surface on a rooftop of a building is laid with a heat insulating material having a high porosity on the slab concrete surface side and a low porosity on the opposite surface side in the thickness direction, and one of the waterproof sheets with respect to the heat insulating material surface. Has a first step portion formed at an end portion thereof and a second step portion having a substantially similar shape which is engageable with the first step portion and has a width shorter than the first step portion at an end portion of the other waterproof sheet. The first and second stepped portions are joined together at the time of overlapping or butting the first stepped portion and the second stepped portion with an adhesive or a welding agent, and the width difference between the first stepped portion and the second stepped portion is different. A heat insulating and waterproofing method on a roof of a building, characterized in that an adhesive or a welding agent is interposed in the generated voids.