The paper introduced the construction technology of bituminous concrete paving coat, the materials choice of waterprooflayer.
介绍了沥青混凝土铺装层的施工技术，并对防水层材料的选择等技术也作了介绍。
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A utility model discloses a soft well dried net surface with big pores. The net surface comprises a layer of water-proof nonwoven whereon pluralities of big pores are distributed evenly.
Said invention utilizes plastic film or plastic board as the water-prooflayer of root, while the plastic layer is mounted on the surface of root or in the one layer of multilayer structure of root.