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how to put a slight fall on a flat roof?

i have flat roof with skylights i want to know how to put a slight fall on it
mr mccann, April 2010
You can't unless you strip the existing roof of and fix furring strips on top of the rafters. Your local timber merchant will cut them for you from same thickness of the existing rafers and have them cut to the fall you want eg:25mm down to 5mm. Pre drill the nail holes to prevent splitting.

Charlie, May 2010