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 133-7562-1123】 【applied drain tile roofing projects in the water layer directly above the roof in place of traditional waterproof layer on top 7cm thick reinforced concrete rigid protective layer, so that the protective layer from the rigid variables for flexible, so that the construction easier, faster, and radically reduce the rigid protective layer has been completed during the construction of the waterproof layer on the destruction of the entire project from the point of view, no need to drain faster construction backfill subsequent follow-up conservation greatly shorten the construction period, save manpower, financial and material resources.