First of all, of course, there is water, so there is no water leakage! Secondly, cracks (or holes, holes) in buildings; Third, water flows through cracks, holes and holes. These three elements are commonly known as the missing three elements.

Keep buildings away from water ―― Use various waterproof materials to isolate buildings from water sources. Such as: laying waterproof coiled material or polyurethane waterproof material on the roof; Use coping on daughter's wall; This principle is applicable to the waterproof surface of polyurethane paint for basement.

Make the building crack-free and potholes ―― cast-in-place roof with micro-expansive concrete as a whole to reduce joints and cracks; All kinds of cracks and joints in buildings are sealed with polyurethane caulking materials or filled with water-soluble polyurethane chemical grouting materials; This principle is also applied by shielding the gap with coiled material (or paint).

Let water not pass through the cracks ―― for example, water-soluble polyurethane chemical grouting material is pressed into the cracks of concrete by pressure conveying equipment to block the capillaries of concrete and prevent water from infiltrating into concrete; Waterproof mortar plastering; Spraying waterproof agent and the above measures are all methods to prevent water from flowing out of the gap.

It can be seen that the effect of composite waterproofing on the same leakage factor is not as good as that of treating each leakage factor alone. Of course, if measures can be taken against the three leakage factors at the same time, building waterproofing should not be a problem.

Waterproofing is difficult because water is a ubiquitous substance. Waterproofing is easy. As long as the causes of leakage are found out, targeted measures are taken in many schemes and seriously implemented, the goal can be achieved, not to mention the comprehensive use of various measures. The key to achieve waterproof purpose is accuracy: accurate leakage reasons, accurate waterproof materials and accurate waterproof measures. The word "accuracy" leads to three elements of waterproof, namely design, materials and construction.

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