Asphalt viscosity--why now?(roofing) Roofing Siding Insulation | February 1, 2008| | COPYRIGHT 2008 Questex Media Group, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information) Copyright

With the growth of various roofing systems, such as single-ply, sprayed-in-place polyurethane foam, metal, and modified bitumen (MB), why would we be interested in asphalt at all, and especially why would we want to introduce viscosity grading right now?

First of all, asphalt is hardly dead as a construction material. It functions as a construction adhesive and a waterproofer and needs no validation. Built-up roofing (BUR) is not going away, and asphalt is used in all our modified-bituminous roof systems as a waterproofing coating for the reinforcements as well as ...

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