Roofing System

SBS modified bitumen roofing (Styrene-Butadiene-Styrene) is a system composed of asphalt and synthetic rubber. As a modern version of the BUR (Built Up Roof) roofing method, the SBS rubber composition material is used on low slope flat roofs and is trusted to perform exceptionally well against extreme weather conditions. Opposed to other lightweight membranes that are more susceptible to winds and movement, an SBS system moves with the building.


SBS can be installed using cold apply, heat welded, self-adhered, mechanically fastened, or hot application methods. Prior to installation, an insulation will be installed between the roof deck and the SBS membrane.

Cold Apply SBS –Cold adhesives along with flashing cements, plastic cements and primers are all asphalt products that bond to the modified bitumen surface of the membrane by a type of solvent weld. This type of application has a low odor and has limited handling precautions when installed over occupied buildings.

Heat Welding SBS – SBS heat applied membranes utilize a heat welder or torch to bond the SBS together making it theoretically impossible to separate the seams of the SBS membraned

Self-Adhesive SBS – When the application options are limited due to odor, open flame or regulation on volatile organic compounds, self-adhesive applications can be used. This method is fast, requires few tools and leaves little mess relative to other applications. However, there are low temperature limitations as thermal cycles and solar heating help to bond membranes.

Mechanical Fastening SBS – This process is best used in high-wind zones to attain some of the highest wind-uplift resistance values. Additionally, mechanically fastened SBS allows for the removal of coverboard from the system, saving time and money.

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The Benefits of a SBS Modified Bitumen Roofing System

  • Higher elongation allowing the membrane to move with the natural expansion of the roof components.
  • Increased elasticity
  • Low temperature flexibility
  • High temperature resistance
  • Better adhesive properties
  • High UV-resistance / durability


All WNC Roofing’s SBS roof installations come with a 20-year manufacturer’s warranty that stands behind the integrity of the product. WNC Roofing adheres to the manufacturer’s installation requirements to maintain the 20-year warranty for all roofs we install.

A post-installation inspection is conducted by the manufacturer following each of WNC Roofing’s projects before a final sign-off for the 20-year warranty is approved. Additionally, WNC Roofing provides a two-year workmanship warranty to cover all installation aspects.