Versico HPVX Fasteners are used with HPVX Fastening Plates to secure mechanically attached VersiWeld® TPO and VersiFlex® PVC roofing systems to 20 and 22 gauge steel decks or minimum 15/32" CDX plywood decks. HPVX Fasteners are #15 steel-threaded fasteners that offer excellent driving and pull-out performance and outstanding resistance to back-out and corrosion. HPVX Plates are 2-3/8" diameter, 20-gauge steel plates with 12 barbs that provide increased slip resistance of membrane during uplift conditions.