Practice and key points of roof waterproof lap and additional layer
1、 Base course treatment 11. During construction, the waterproof base course should be basically in a dry state, and the moisture content should be less than 9%. During construction, the waterproof base course should be in a dry state, and the moisture content should be less than 9%. The simple measurement method is to cover the rubber sheet with an area of about 1 square meter and a thickness of 1.5-2.0 mm on the base course surface, and place it for 2-3 hours. If there is no watermark on the covered base course surface, The rubber plate close to the side of the base course has no condensation watermark, which can meet the construction requirements. 2. Before construction, use a shovel and a broom to remove the protrusions, mortar bumps and other foreign matters on the surface of the base course, and thoroughly clean the dust and debris. The internal and external corners, pipe roots, floor drains, drainage outlets and other parts should be carefully cleaned. If oil stains, rust, etc. are found, they should be thoroughly cleaned with wire brushes, sandpaper and organic solvents.