SC Roofing Practice Questions - South Carolina Roofing Contractor Examination Exam

Where a parapet can impound water if the primary drain clogs, IBC roof-drainage provisions require:

A larger primary drain only; overflow is optional Scuppers through the parapet at the same elevation as the primary drain inlet No overflow if the membrane is fully adhered Secondary (overflow) drains or scuppers with inlets set above the primary drain, independently piped, so a clogged primary cannot flood the roof

Correct Answer:

Secondary (overflow) drains or scuppers with inlets set above the primary drain, independently piped, so a clogged primary cannot flood the roof

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