Carlisle’s Sure-Weld TPO reinforced membrane is a premium, heat-
weldable, single-ply thermoplastic polyolefin (TPO) sheet designed for 
new roof construction and re-roofing applications. Sure-Weld High Slope 
(HS) membrane is formulated with additional flame retardant for higher-
slope fire code approvals. Sure-Weld Extra is 80 mils (2.03 mm) thick for 
significantly higher strength and weatherability.
Sure-Weld TPO membranes use advanced polymerization technology 
that combines the flexibility of ethylene-propylene (EP) rubber with the 
heat weldability of polypropylene. All Sure-Weld TPO membranes include 
OctaGuard XT™, an industry-leading, state-of-the-art weathering package. 
OctaGuard XT technology enables Sure-Weld TPO to withstand the extreme 
weatherability testing that is intended to simulate exposure to severe climates. 
Physical properties of the membrane are enhanced by a strong polyester 
fabric that is encapsulated between the TPO-based top and bottom plies. 
The combination of the fabric and TPO plies provides high breaking and 
tearing strength, as well as excellent puncture resistance. The relatively 
smooth surface of the membrane produces a total surface fusion weld 
that results in a consistent, watertight, monolithic roof assembly. The 
membrane is environmentally friendly and safe to install.