CertainTeed Roofing – Low – Slope
750 E. Swedesford Road
P.O. Box 860
Valley Forge, PA 19482
Tel: (800) 233-8990
Fax: (610) 341-7940
Email: building.solutions@saint-gobain.com
Web site: http://www.certainteed.com
In the 1970s technological advances in asphalt sciences originating
in Europe led to the development of modifiers such as APP (atactic
polypropylene) and SBS (styrene-butadiene-styrene) which, when
added to unblown (unoxidized) asphalt, impart either plastic (APP)
or rubber (SBS) characteristics. These additives provide enhanced
performance characteristics to traditional asphalt, and when coupled
with reinforcements such as polyester (superior elongation abilities)
or fiberglass (high tensile strength) create high performance roof
membranes.
APP modified bitumen membranes are self-adhering when heated
using a roofing torch. SBS modified bitumen membranes can be
formulated for torch application, but are more commonly applied
using hot asphalt or cold SBS modified bitumen adhesive. The
result is a BUR system with significantly enhanced performance
capabilities. Continuing improvements in technology have also
resulted in self-adhering SBS roof membranes.
When an SBS or APP cap sheet is combined with traditional BUR
base sheets and interply sheets, the result is a "hybrid" roof offering
the best of both systems, multiple plies and superior performance
and longevity.
All of these systems are excellent roofing choices for industrial,
commercial, institutional and residential low slope roofing. In
choosing, factors such as site access, structural load, finished
appearance, desired warranty and performance criteria should all be
considered. Your CertainTeed commercial roofing territory manager
can help with more information.
BUR materials are applied with hot asphalt or cold adhesives; SBS can be formulated for hot asphalt, cold adhesive, self-adhesive or torch application; APP membranes are typically torch applied only.
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