Product Overview
Cap Sheets   Base Sheets

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Revised: August 06, 2013


BITEC SBS modified bitumen membranes are composed of styrene-butadiene-styrene thermoplastic rubber, blended with high-quality distilled asphalt and reinforced with spun-bond polyester fabric or high-strength fiber glass mat.

BITEC SBS membranes are manufactured to suit
a variety of application methods, and possess the
following characteristics:

It is necessary to have a factory installed or an on-site installed surfacing on SBS modified bitumen membranes. Therefore, most SBS modified bitumen membranes come with factory installed roofing granules for this purpose. With smooth surface SPS-3H, a site installed surfacing of either flood coat and gravel, or approved roof coating must be applied for ultraviolet light protection and for compliance to warranty provisions.

SPM and SFM membranes contain factory installed roofing granules preventing the necessity of adding on-site surfacing. However, as previously mentioned, our SPS-3H product require on-site application of surfacing.

Tools required for the proper application of these products are detailed in the BITEC specification manual and technical bulletin relative to the specific SBS modified bitumen membrane being used [Specification Manual]. For heat welded systems, bonding is performed with a propane gas fired roofer's torch. For hot asphalt applied systems, bonding is per formed with the use of ASTM D312 Type III, or Type IV roofing asphalt applied with conventional equipment.

For cold adhesive applied systems, bonding should be performed with BITEC SBS modified bitumen adhesives, or with any BITEC approved SBS modified bitumen adhesives. For all applications, the membrane should be laid out, aligned and completely bonded to the substrate as prescribed in the project's written specification, and contingent upon the specific method of application.

Particular care should be taken to completely seal all seams and laps.


  • Impermeability to water
  • Outstanding flexibility at very low temperatures (<20C)
  • Resistance to thermal aging
  • Excellent substrate adhesion
  • Resistance to perforation
  • Superior elasticity
  • Excellent mechanical and fatigue strength
  • Tear resistance
  • Dimensional stability
  • Years of proven field performance in all climate areas

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 BITEC, Inc. All rights reserved.