Why Do Shower Drains Leak to the Ceiling Below? Reference Standard: ASTM D2665 (Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Drain, Waste, and Vent Pipe and Fittings) and ASTM D395 (Standard Test Methods for Rubber Property—Compression Set). Short Answer A floor drain flange leaks primarily due to anisotropic shrinkage in its polymer matrix, which distorts … Read more
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