1. Clean up the garbage on the laying site and make cement leveling so that there is no obvious concave and convex on the site. The outdoor garage roof and roof garden need 2-5‰ looking slope.2. The water discharged from the drainage board can be collected and discharged to the nearby downpipe or t

Siphon drainage collection system, the real solution to the garage roof construction will encounter large area slope difficulties, the destructive pressure of the rigid protective layer on the roof, the traditional blind ditch blind pipe drainage efficiency low drainage problems.Siphon drainage coll

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