Carlisle's SureMB 90TG Base is a smooth-surfaced, premium, SBS (Styrene-Butadiene-Styrene), torch-applied membrane. Reinforced with a fiberglass mat that is saturated and coated with high-quality asphaltic bitumen and SBS elastomers, this product offers flexibility, durability and easy maintenance. It is designed for use as a base ply or inter-ply in Carlisle's multiple-ply system and can also be used as an vapor barrier, air barrier or temporary roof (for up to 60 days).