What is the minimum drainage falls for a single ply flat roof?

Posted on February 17, 2022 by IKO-Team

In accordance with BS6229:2003 the recommended finished fall of a flat roof is 1 in 80 (0.72⁰) however it should be designed to 1 in 40 (1.44⁰) to allow for material deflection and substrate inconsistencies to allow free drainage of rainwater.