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１基层（１）厚度５０ｃｍ以上，而且透水系数在１０ｎｍ／ｓ（１×１０－６ｎｍ／ｓ）以下的粘土层或其它材料的基层。（２）浇注５ｃｍ厚的沥青混凝土层，而且透水系数在１ｃｍ／ｓ（１×１０－７ｃｍ／ｓ）以下。２隔水层的选择在选择隔水片材时，高分子隔水片材厚度＞１．
1 base layer (1) The base layer of a clay layer or other material having a thickness of 50 cm or more and a water permeability coefficient of 10 nm/s (1×10-6 nm/s) or less. (2) Cast 5cm thick asphalt concrete layer, and the water permeability coefficient is below 1cm/s (1×10-7cm/s). 2 Selection of water-repellent layer When selecting the water-proof sheet, the thickness of the polymer water-repellent sheet is >1.