A cast iron roof drain assembly is integrated into the roof system with a drain receiver, clamping ring, and cast iron strainer dome. A four-pound lead set in roof cement is installed over the ply sheet and secured by the clamping ring over the completed roof membrane. The roofing membrane complies with specifications per FM 1-90 and extends over a perlite cant strip nailed to the deck at twelve inches on center. Framing components are provided by others.
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