CRS carries Carlisle’s HP-X Membrane Fasteners. They are used in conjunction with TPO, PVC, and KEE HP isoweld Fastening Plates to secure Sure-Weld® TPO, Sure-Flex™ PVC, and Sure-Flex KEE HP roofi ng membrane to 20-gauge (0.91 mm) or 22-gauge (0.76 mm) steel or wood decks (minimum 15⁄32″ [12 mm] CDX plywood). HP-X Fasteners provide excellent driving performance, back-out and corrosion resistance, and pull-out values. – Due to issues with manufacturers obtaining raw materials and extreme turnaround times with our vendors, Membrane Fasteners are temporarily not available for purchase online.