The Modified Bitumen Design Guide for Building Owners from ARMA is a valuable resource for roofing professionals installing and maintaining asphaltic roofing systems. The guide is broken up into sections and addresses relevant aspects, issues, and concerns of modified bitumen roofing systems and its associated components, substrates, construction techniques, and innovative uses. It includes considerations for the latest trends in roofing that call for the roof to provide more than waterproofing, including solar, garden, and recreational surfaces.