JOHNS MANVILLE Roofing Systems Group 717 17th Street Denver, CO 80202 Toll-Free: (800) 922-5922 Fax: (303) 978-2318 Web site: http://www.jm.com/roofing SBS Modified Bitumen Roofing Systems By modifying premium grade asphalts, JM has developed formulations that enhance the asphalt’s overall weatherability. By combining these modified asphalts with nonwoven polyester or glass fiber reinforcements, JM produces waterproofing systems that exhibit tremendous strength, elasticity and weather-ability. Our SBS product (coated with an elastomeric blend of asphalt and Styrene-Butadiene-Styrene rubber) has elongation and recovery properties that allow it to accommodate recurring stresses, reducing the possibility of premature fatigue failure. This also gives it truly remarkable cold weather performance. SBS products are typically installed using hot asphalt as the bonding adhesive. But they can also be installed in compatible, low-solvent, cold adhesives. Unlike BUR systems, The mopping asphalt serves more as an adhesive than as a waterproofing agent. And, although a base sheet is commonly used, its purpose is primarily as substrate preparation rather than another layer of reinforcement or waterproofing. In hybrid BUR/modified bitumen systems, two or more plies of built-up roofing are capped with modified bitumen. This combination offers an SBS membrane system with the redundancy of a BUR system. DynaWeld Base and DynaWeld Cap FR sheets however, the latest additions to the JM SBS modified bitumen line, are designed specifically for installation using heat-welding application techniques. Modified bitumen blends are sensitive to ultraviolet rays and, therefore, require protection. All of the JM modified bitumen products are covered with ceramic roofing granules or have a surface compatible with coatings or other protective surfacings. The SBS products provide a broad range of formulations and mat composites for varying degrees of strength, elasticity and flexibility. Many of the products are also available with fire-retardant chemicals. Various flashing sheets, cements and adhesives are also available.
Sources For Full Information For complete information and specifications on Built-Up, Modified Bitumen and Single Ply roofing products and applications, please refer to the JM web site, www.jm.com. The JM Commercial/Industrial Roofing Systems Manual (RS-7030) is also available. Or contact the Regional Technical Services Manager who can be reached through the JM Regional Sales Office nearest you, or the Technical Services Specialists at the Guarantee Services Unit. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||