construction method of SBS modified asphalt waterproof membrane

- Sep 07, 2018 -

High-polymer modified bitumen waterproofing membrane (SBS) coil and cemented materials, with product certification, quality inspection report, on-site sampling re-inspection report, must meet the design requirements and the "Compulsory Provisions for Construction Engineering Construction" standards. The details of the waterproof layer of the coil and its deformation joints, crevices, flooding, water drop, embedded parts, etc. must comply with the design requirements and waterproof engineering technical specifications. Leakage is strictly prohibited on the waterproof layer of the coil.

First, the construction process of hot-melt paving waterproof membrane is as follows:

It is a high quality elastic modified asphalt waterproofing membrane. The coil material is impregnated with a high-strength polyester base to infiltrate a high-quality SBS modified asphalt coating with quartz sand on the upper surface and an anti-stick protective film on the lower surface. First roll the entire roll of material into the paving area, and then roll the roll from both ends as appropriate. One person holding a gasoline burner is reciprocatingly moving to the roll, until the rubber layer on the bottom of the coil is black and the micro-bubble is mixed, and the coil is pushed in time to stick.

Second, node processing:

1. Coil overlap

The technology is prepared first, and the “Special Construction Plan for Waterproof Engineering” is prepared in strict accordance with the requirements of the construction design drawings, and submitted to the supervision unit and the construction unit for approval. Before the operation, the technical construction will be carried out. The waterproof project must be constructed by a professional construction team.

When wrapping the coil, pay attention to the short-edge lap joint between the same layer should be at least 1.5m apart. The upper and lower layers of the coil should not be laid perpendicular to each other. The base layer of the waterproof layer must be applied and cured. , to achieve a certain intensity. Before the construction of the waterproof layer, the surface of the base layer should be cleaned, and the quality of the base layer should be checked at the same time.

2, lap seam

According to the design requirements, the waterproof layer should be prepared with coil materials and auxiliary materials. Store and operate away from fire sources to prevent accidents.

The lap joint treatment of SBS modified bitumen waterproofing membrane is an extremely important part in the project. In the construction, it should be strictly in accordance with the requirements of the national standard, “the joint part must overflow the asphalt hot melt adhesive and form a uniform asphalt strip”. The key to control is the preparation of polyurethane primer: the polyurethane material is blended in the ratio of A:B = 1:3 (weight ratio), and the coating can be carried out by stirring evenly; it can also be made of polyurethane material: A: B: Xylene = 1 : 1.5:1.5 ratio, mix well and apply.

3, the setting of the additional layer

The additional reinforcement layer of the coil shall be provided at the intersection of the flat façade, the turning point, the yin and yang angle, the pipe root, etc., and the special additional layer of the same material as the large-faced coil is generally used with a width of 500 mm. Additional coils for special parts need to be cut on site as required.

Third, flooding waterproof detailing practices

The roof coil should be laid up from the crotch parallel to the ridge. The bidirectional flow slope should be in the direction of the water, and the overlap width of the long side and the end, such as empty, sticky, and sticky, are 100mm. The full-stick method is 80mm, and the end joints are staggered by 250mm.

The pressure top should be waterproofed. For example, if the wall is a concrete wall and the roof structure is convex, the closing method of the façade coil is as shown in the following figure 3. If other façades are used, the following figure 4 is preferred. The method of closing the mouth, such as the façade, has no grooves and no bulge, and the web which is connected with the plane and the façade should be carried out from the bottom to the top, so that the coil is close to the yin and yang angle, and the coil can not be pulled during the spreading. Tight, and there must be no wrinkles or empty drums.

Fourth, inspection and acceptance:

According to the acceptance criteria of the “Compulsory Provisions for Construction Engineering Construction”, carry out concealed project acceptance, check the construction records, check the waterproofing layer of the coil after rain or the water and water storage inspection records, confirm that the practice meets the design requirements, after rain or water, After the water storage inspection, it is confirmed that no water leakage is allowed before the waterproof protective layer can be constructed. Protective layer construction: After the coil is laid, the concealed project acceptance is carried out. Under the condition that no leakage is confirmed, the non-superior roofing surface is evenly coated with the colored protective paint; the upper roof is made according to the design requirements. Material or rigid protective layer.

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