How to Install Modified-Bitumen Roofing
Learn how to resurface a flat roof with modified bitumen, also known as rubber roofing.
Flat roofs were once exclusively the province of professionals, but new materials enable do-it-yourselfers to install flat roofs. If your flat roof is covered with gravel, you will likely need to hire a professional to reroof it. If the surface is smooth you may be able to reroof using sheets of modified bitumen or EPDM (rubber) roofing.
Consult with your inspector to see whether you need to tear off the old roofing or if you can reroof over the existing roofing. Use flashings approved by your building department. Modified-bitumen roofing may have a granular surface as shown here or it may be smooth. If you install the smooth product, cover it with aluminum coating.
These steps show a "torch-down" method, which looks a bit scary but actually is not too difficult. Renting a large propane torch is inexpensive. You can also set the sheets in adhesive; this sounds easier but is actually messier and more time-consuming. Expect to spend one or two days, working with a helper, to lay insulation and modified-bitumen roofing for a 500-square-foot roof. Before you begin, measure and make a drawing of your roof and consult with a dealer.