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Baseline requirements and treatment of polyurethane waterproof coating construction
1. The waterproof base layer should be smeared with 1:3 cement mortar according to the design requirements, and the surface should be smoothed and calendered. No defects such as unevenness, looseness and sanding and ash are allowed. The drain or floor drain should be lower than the entire waterproof layer to remove stagnant water. The piped part of the casing should be more than 20mm above the surface of the base layer. The yin and yang corners should be made with small rounded corners with a radius of 10mm for paint application.
2. All pipe fittings, sanitary equipment, floor drains or drains must be installed firmly, the joints are tight, the head is smooth, and there must be no looseness.
3. During construction, when the traditional polyurethane waterproof coating is applied, the waterproof base layer should be basically dry, and the water content is less than 9%. The simple measurement method is to cover the rubber sheet with the area of ​​1m2 and the thickness of 1.5~2.0mm. On the base level, it is placed for 2 to 3 hours. If there is no watermark on the surface of the covered base layer, the rubber sheet on the side of the base layer has no condensation watermark. According to experience, the water content is less than 9%, which meets the construction requirements.
4. Before construction, remove the foreign objects such as protrusions and mortar shovel on the surface of the base with a blade and a broom, and thoroughly clean the dust and debris. The yin and yang angles, pipe roots, floor drains and drains should be carefully cleaned. If oil, rust, etc. are found, they should be thoroughly cleaned with wire brush, sandpaper and organic solvents.
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