ul 580 construction no. 342 over metal deck with rigid . - mbci construction no. 342. uplift - class 90. fire not investigated. 1. metal roof deck panels* no. 24 msg min gauge coated steel. panel width 18 in. max., 10 in. min.panels continuous over three or more clips with no end laps.foamed plastic - (rigid insulation) (optional) - expanded polystyrene supplied in 4 by 8 ft.