/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRC ASTM Special Technical Publication, 790, pp. 65-77, 1982 Methods of evaluating single-ply roofing membranes Laaly, H. O. ABSTRACT:In the last 20 years several new types of roofing material have been introduced to the construction industry, including various inorganic and organic materials and their combination, generally prefabricated. This paper deals only with single-ply membranes made from such materials as flexible polyvinyl chloride (PVC), elastomers. that is, polyisobutylene (PIB). ethylene propylene diene monomer (EPDM), hypalon (CSPE), and other rubber and rubber-like materials and reinforced modified bitumens.As them is need for criteria to facilitate appropriate selection and for specificarions to ensure proper application, several test methods haw been evaluated that assess physical, mechanical, and weathering properties of single-ply membranes. Some have been incorporated in the Standards 01 the Canadian General Standards Board (CGSB).Some of the more important tests include those for lap-joint performance, dimcnrional stability, water absorption, stress-strain properties, law-temperature flexibility, static and dynamic puncturing. load-twist, and the so called wheelbarrow test. he italic numben in brackets refer to the list of references appended to this paper. SINGLE-PLY ROOFING TECHNOLOGYThis paper will address these questions as well as describe what the Division of Building Research, National Research Council of Canada has contributed to shed light on the composition, classification. testing, and application of roofing materials. The Canadian government has experienced heavy losses as a result of roofing failures and 8 years ago decided to take a special interest in the matter. The close cooperation that developed during the past 8 years between the National Research Council and the Canadian General Standards Board (CGSB). Canada Mortgage and Housing Corporation (CMHC), Canadian Roofing Contractors Association (CRCA), and roofing material manufacturers resulted in this intensive research.Research on roofing materials at the Division of Building Research, National Research Council of Canada has been divided into two categories: conventional materials (organic felt, built-up roofing membrane, and asphalt shingles) and new materials. This paper will deal only with new materials, although it can not attempt to cover all types of new and specialized roofing materials in detail; only the most common and widely used materials will be discussed.Chemists have contributed a great deal to present comfort by developing new products, among them polymeric materials which are used for various fabrications. Polymers are made of thousands of simple organic molecules combined in large molecules, a proc...

A development study of test methods and criteria for evaluating new roofing materials is described: prefabricated polymeric and elastomeric sheets, prefabricated modified bituminous membranes, and liquid applied membranes. Results are summarized for a number of materials selected as typical of the three groups in order to illustrate the problems and the limitations associated with the different tests.

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The past twenty years is considered to be a landmark and revolutionary advancement period for the progress and recognition of various classes of Single-Ply Roofing Membranes in Canada and the United States. During the same two decades, parallel and independently tremendous efforts and billions of dollars were allocated to generate electricity from solar radiation by advancing the level of understanding and implementation of photovoltaic science and technology. Prohibitively expensive, in 1969, the dream of landing on the moon and returning to Earth became a reality by combined efforts of the U.S. scientific community. The use of photovoltaic semiconductors on glass panels was a key factor for the success of this monumental project. Seventeen years later in 1986, the author succeeded in bringing these two technologies together. The photovoltaic single-ply roofing membrane is a product which combines the usefulness and universal utilization of both science and technologies. This patented procedure, the basic research and development of its components, and the self sufficiency of the electrical energy generated is discussed. The testing and application standards proposed for this class of revolutionary, flexible and bi-functional roofing membranes, examples of their potentials for mass production and applications are also provided.