[Engineering Version] Daily Question 20180602

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Which of the following statements regarding the construction of membrane waterproofing is incorrect? ( ) A. Before laying the waterproof membrane, a primer should be applied to the substrate; this primer should be made of materials that are compatible with the properties of the membrane, or it can be a primer similar to those used for such coatings. B. When laying polymer-based waterproof membranes, it is important not to stretch them too tightly, as this can cause the membrane to remain under tensile stress over time, thereby accelerating its aging process. C. The construction sequence is as follows: leveling layer installation → waterproof layer installation → protective layer installation → quality inspection. D. The joints where the membranes overlap should be sealed using sealing material with a width of at least 20 mm, in order to ensure the overall waterproof performance of the membrane. Answer: D 【Explanation】Before laying the waterproof membrane, a primer should be applied to the substrate; this primer should be made of materials that are compatible with the properties of the membrane, or it can be a primer similar to those used for such coatings. When laying polymer waterproof membranes, be careful not to stretch them too tightly, as this can keep the membranes under tensile stress for an extended period, thereby accelerating their aging. The construction process sequence is: application of the leveling layer → application of the waterproof layer → application of the protective layer → quality inspection. The joints where the sheets overlap should be sealed with a sealing material having a width of at least 10 mm, to ensure the overall waterproof performance of the waterproof layer.