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Reinforced bitumen membranes (RBMs) for roofing. Guide to selection and specification Ingestion-build-79769 and linear mass that facilitates1 Scope This British Standard gives guidance to assist the selection and specification of a system of appropriate layer(s) of reinforced bitumen membrane (RBM) for each flat and or sloping roofing project, tailored to the particular requirements of that project. It provides a grouping system to assist the specifier, utilizing material properties as tested according to BS EN 13707.