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1 Performance Properties of Interply Adhesive Used with SBS-Modified Bitumen Membranes

There are more options than ever for adhering modified bitumen sheet materials, including hot asphalt, heat welding or torching, liquid cold adhesive and self-adhesive. When SBS(styrene-butadiene-styrene) modified bitumens were introduced in the United States in the late 1970s, the majority of the U.S. contractor base was built-up roofing (BUR) oriented. Familiarity with hot asphalt application and practicality of dealing with existing equipment made installation of SBS-modified bitumen membranes in hot asphalt an easy choice. However, in the years since, laboratory testing and field experience have demonstrated that other interply bonding choices – solvent-based adhesives, heat welding and heat-activated self-adhesives – offer higher performance. Some fundamental characteristics and performance differences of various types of interply attachment methods specific to SBS-modified bitumen roofing membranes will be emphasized in the paper as well as practical considerations for choosing the appropriate application method Authors Tim Kersey Tim Kersey is the manager of technical development for Siplast/Icopal. He has a B.S. in Chemistry from Henderson State University, and has been with Siplast/Icopal for the past 18 years specializing in the testing and development of SBS modified bitumen roofing systems and accessories. Kersey is the chairman of ASTM International subcommittee D 8.04 “Felts and Fabrics for Bituminous Roofing and Waterproofing,” and is a past chairman of the Asphalt Roofing Manufacturers Association (ARMA) modified bitumen committee. He was a faculty member of the Roofing Industry Educational Institute (RIEI). He has also chaired the modified bitumen committee at SPRI, and has been active in standards development with the Canadian General Standards Board (CGSB). Ernesto Santos Ernesto Santos is the research laboratory manager for Siplast/Icopal, Inc. He has a B.S. in Chemical Engineering from the University of Puerto Rico, and has 10 years of