Flat Roof Drainage

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February 3, 2023 at 2:01 p.m.

alextolle

Bette in Connecticut asked:

I have a flat roof with no drainage. It is holding water. How can I create drainage? I need design for a slightly pitched roof with some sort of a gutter. This is a very modern house.

February 3, 2023 at 2:02 p.m.

alextolle

John Kenney from Cotney Consulting Group says:

The easiest way to accomplish that would be with a tapered roof design. Depending on your perimeter gutter locations, one of these two designs would suit you best. The slope is accomplished with ¼” pft sloped panels in various sizes, as seen below.

Diagram, engineering drawing

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Diagram, engineering drawing

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February 7, 2023 at 1:35 p.m.

alextolle

Marty from Go Roof Tune Up says:

The best way to create a slope in your flat roof is to have a tapered insulation system designed. You get the proper drainage and an increased “R” factor in your insulation.


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