There are three main flat-roof systems: rubber, fibreglass and torch-on felt. A well designed and waterproofed flat roof should not cause problems or leak . Denise O'Connor. Thu Jun 02 2016 - 05:24.

The most important factor for any flat roof is generally not the covering, but the underlying structure. Flat roofs should have a gradient of at least 1-in-80 to ensure quick rainwater run-off ...