HW™ SMOOTH Membrane

HW Smooth Membrane

HW Smooth Membrane

Why RUBEROID® HW Smooth Membrane?

RUBEROID® HW Smooth is a tough, resilient, modified bitumen membrane manufactured to stringent GAF specifications. Its core is a strong, resilient, non-woven polyester mat that is coated with flexible, polymer-modified asphalt and has a smooth surface. Smooth surface heat-weld installations must be protected with surfacing.


  • System guarantees are available for up to 20 years1
  • The installed cost is less than most single-ply systems on the market today
  • Installed roof designs weigh less than 2 pounds per square foot
  • Specially formulated modified asphalt gives lasting performance
  • Resilient polyester mat core allows it to resist splits and tears due to its pliability and elongation characteristics
  • Backed by GAF, a company with over 130 years in the roofing business


  • RUBEROID® HW Smooth is designed for new roofing and re-covering applications as well as the construction of flashings.
  • RUBEROID® HW Smooth is also an ideal product for repairs of built-up roofing membranes or other modified bitumen systems.

1See applicable warranty or guarantee for complete coverage and restrictions.


Protect Your Investment

Find out about product warranties and options that may help protect your most valuable assets. 

  • System Pledge Roof Guarantee
  • Diamond Pledge NDL Roof Guarantee

Product Properties

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