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Backing should be at least 10 inches high.
A 2 or 3 piece shower drain set flush with subfloor.
Dam must be minimum 2 inches above the top of the drain (Usually three 2x4's stacked one on top of the other).
Rapid set cement used to pitch 1/4 in. per foot for pre-slope.
4 layers of asphalt and 3 layers of 15 lb. felt. Felt is layed down between each layer of hot tar
Fiberglass places on each corner and union for extra protection.
