Overflow drains shall be the same size as the roof drains with the inlet flow line two inches above the low point of the roof and shall be installed independent from the roof drains.
Roof drain and overflow.
Cast iron roof drain with 2 in.
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Roof drains from zurn include combination primary overflow control flow dual outlet siphonic retrofit and more which cater from educational to commercial needs.
Combination overflow roof drains.
Watts drainage products rd 300 r series 4 in.
Cast iron roof drain.
Copper roof drain with overflow horizontal outlet.
Josam 22200 combination roof drain overflow.
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By the 1997 edition of the upc section 1101 11 2 had been added that completely prescribed where and how secondary roof drainage was to be provided.