Performance Approach to the Development of Criteria for Low-Sloped Roof Membranes

摘要

Waterproofing of roofs of commercial and industrial buildings in the United States is primarily accomplished using low-sloped membrane roofing systems. Estimates indicate that approximately 300 million square meters (3 billion square feet) of membrane roofing is installed annually. The three main types of membranes are built-up bituminous, single-ply elastomeric and thermoplastic, and polymer-modified bitumens. In addition to the membrane, the other main components are insulation boards and the structural deck, with elements such as vapor retarders and membrane surfacings used in some systems.