CertainTeed's premium polyester-reinforced, smooth-surfaced, mop-applied, SBS-modified base sheet, Flintlastic® Ultra Poly SMS, is both robust and resilient and delivers the benefits of a homogenous roof system when paired with SBS-modified bitumen cap sheets such as Flintlastic® GMS, Flintlastic® FR-P and Flintlastic® Premium FR-P. Many members of the design and specification community prefer multi-layer modified bitumen roof systems constructed with the same polymer-modified material and application methodology for base and/or interply and cap sheets, to optimize stress resistance to the roof system with materials expanding and contracting at the same rate. Ultra Poly can also be torch-applied and, while most commonly utilized as a base ply or interply, may also serve as a cap membrane when coated with SMARTCOAT® reflective roof coatings. More polymerized asphalt and a heavier reinforcement than it's "younger brother", Flintlastic® Poly SMS, this 145-mil membr...See Moreane is manufactured with an extra-tough, stress resilient polyester reinforcement with excellent elasticity and recovery, offering almost the thickness and protection of a standard cap membrane. The polyester mat is saturated and coated with an SBS-modified asphalt with elastic, waterproofing properties. Flintlastic® Ultra Poly SMS is most commonly mopped-applied with hot asphalt or cold adhesive, such as FlintBond® Brush to avoid roof penetrations and allow for extended warranty durations. Reach out to your local CertainTeed Territory Manager to request a sample and demonstration of Flintlastic® Ultra Poly SMS Base Sheet. See Less