The symposium on Single-Ply Roofing Technology was presented at Detroit, Michigan, 24 June 1981. The symposium was sponsored by ASTM Committee D08 on Roofing, Waterproofing, and Related Bituminous Materials and organized by D. E. Brotherson, University of Illinois, D. M. Greason, Dow Chemical Company, Bernard Jones, United States Bureau of Reclamation, J. J. Klimas, GAF Corporation, and H. E. Saint-Amour, Building Products of Canada, Ltd., H. E. Saint-Amour was symposium chairman. W. H. Gumpertz, Simpson Gumpertz & Herger Inc., was committee chairman and editor of this publication.