Modified roofing is made by all shingle manufacturers. It can be installed by the "torch apply" method or it can be "hot mopped". Some modified roofing is "self-adhering" so no heat source is required. Modified roofing is used on most commercial applications as well as patio roofs and in the waterproofing of walk on decks. Single-ply roofing also is available in TPO which does not require a flame for installation and carries a 10 years warranty.