Plumbing · P-K9BCH

Roof Drain Detail

Materials

Elements

Roofs Decks Vaults / Domes Waterproofing / Flashing Insulation Drainage

About this detail

Primary and secondary roof drains are installed in a tapered insulation sump over a roof deck and membrane. The primary roof drain features a notched retaining ring and cast iron dome, while the secondary roof drain includes a non-notched retaining ring and cast iron dome set two inches higher than the primary drain. Manufacturer tapered insulation panels create the drain sumps, supported by preservative-treated nailers and shims as required. Existing drain lines must be cleaned and verified in good working order, and any existing plastic drain domes are replaced with new cast iron domes.

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