RUBEROID UltraClad SBS Membrane is a premium, fire-retarding aluminum foil-faced bitumen membrane manufactured to stringent GAF specifications. The membrane is covered with a protective foil facing with small built-in control channels. RUBEROID UltraClad SBS Membrane is manufactured using a high-tensile woven fiberglass scrim coated with an SBS modified asphalt, which provides excellent cold temperature flexibility and elongation properties. The membrane is covered with a protective foil facing with small built-In control channels.