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Roof Drainage Calculations

Posted by Mike Bell on June 19th, 2000 10:00 AM

Hi all,
I am doing some work on a old warehouse roof and we are considering increasing the dimensions of the roof (adding an extension to the building). Basically, I need to know if there is a standard for how many square feet of roof should drain into a certain diameter drain. Something like X sq. feet = Y diameter drain(s). Has anyone come across this?

Mike Bell

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