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  1. Drain Installation Instructions ´┐╝FLASHING DETAIL FOR BUILD-UP ROOF SYSTEMS 1. Mechanically attach 2 plies of roofing ply sheet embedded in hot asphalt to substrate, ensure the plies extend 18" past underlying portion of drain flange. 2. On under portion of drain flange, embed 1/3" layer, evenly spread roofing mastic ...

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