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John, what type of roof membrane do you want to install? There are numerous flat roofing options including TPO, PVC, EPDM, Modified Bitumen. TPO, PVC, EPDM are considered single ply and are installed either ballasted, fully adhered, or mechanically attached. Modified bitumen is not a single ply, though I have hered it referred to as such on numerous occasion. Modified bitumen requires multiple layers, most often a base sheet and a cap sheet but sometimes a mid ply as well. Modified bitumen can be installed self adhering, cold process applied, or torch applied.

Personally the only DIY roof systems I recommend are self adhering modified bitumen or EPDM. TPO & PVC are my preferred membrane of choice but require specialty tools. I would never dare recommend anyone use a torch that is not properly trained.
 
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