Library of Congress

Multi-Ply SBS-Modified Bitumen Systems

In the late 1960s, Siplast Research and Development, working in conjunction with Shell Chemical of Europe, developed SBS (styrene-butadiene-styrene) modified bitumens.  We found that by properly modifying asphalt with SBS, we could produce a highly durable elastomeric blend with exceptional elongation and recovery properties over a wide range of temperatures.  This technology was applied to the design of our two-ply engineered roof systems, in which the workhorse base ply absorbs roof stresses while the top ply shields the base from the elements and mechanical abuse.  To learn more about our engineered roof systems, click on a selection below.



Paradiene 20/30 System Multi Foil Multi Vegetated
Multi Non surfaced

SBS-Modified Bitumen Roof Systems Brochure


Repair & Maintenance Brochure


Engineered Roofing & Waterproofing Systems


Tech Guide