This 15-1/4“ (390) diam. drain is engineered for roofs where the Insulated Roof Membrane Assembly (IRMA) method of waterproofing is installed using a liquid membrane. It adjusts to roof thickness on-site by spinning its combination flange clamp and gravel stop assembly around the drain's threaded extension and accommodates roofs between 1-1/4" and 4" thick with up to 2-3/4" of insulation. A 4" perforated stainless steel gravel guard protects drain lines from crushed gravel usually installed with IRMA systems along with a polyethylene dome strainer. Drain body and flange assembly are made of Duco coated cast iron.
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