The 2019 manual provides best industry practices and technical information about the design, materials and installation techniques applicable to membrane roof systems used in low-slope roof system applications. The manual includes information about roof decks, air and vapor retarders, rigid board insulation, roof membranes, fasteners, surfacing, accessories, roof system configurations and roof re-coverings. This latest edition has a new format that assists with proper product and material selection. Users initially can reference the first chapter, which contains a selection of roof system configurations. Each of the configurations has a list of applicable roof components along with references explaining where to find additional information in the manual. Also included are 205 construction details for built-up roof (BUR) membrane, polymer-modified bitumen, liquid-applied, EPDM and other single-ply membrane roof systems.