Products / MasterLok-FS

McElroy Metal's mechanically seamed trapezoidal standing seam roof panel with a 3-inch rib and 24-inch coverage, the field-seamed companion to the MasterLok-90. It installs over open framing or solid decking on slopes as low as 1/4:12, with floating concealed clips in utility, low, high and tall heights. Standard substrate is 24 gauge Galvalume finished in Kynar 500 PVDF or acrylic-coated Galvalume, in factory lengths up to 85 feet. McElroy lists UL 263 Class A, UL 580 Class 90, UL 2218 Class 4, ASTM E1592 and FM 4471 for the MasterLok-FS.