Re: size of pipe for roof drain
Posted by hj on September 21, 2002 at 00:31:24:
In response to Re: size of pipe for roof drain
Your building department will have to answer that after consulting their rainfall tables for your area.

: I have a 4,200 sq ft flat roof in central NH to drain- will 4 4inch pipes, leading to an 8 inch pipe be adequate??




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