Velar Structures HI-RIB roof and wall cladding system is available in the following base material in standard execution. Galvalume high tensile cold rolled steel 345/550 as per AS-1397 standard (AZ 150 gsm/mВІ) Zinc-Aluminum alloy coating mass, total of both sides, 550/345 Mpa yield strength conforming to AS-1397. Roof Sheeting is 0.47 mm thick Hi Rib Bare Galvalume Wall Cladding is 0.50mm thick Hi Rib Colored coated Galvalume