GYPSUM BOARD CLAD DUCTSSupply & fix 12.5mm thick approved drywall gypsum board cladding to ducts for Downpipes, Sanitary pipe, Electrical coduits & Vent Pipes where shown on drawings. Boards fixed to 63.5mm top & bottom galvanized steel tracks with 63.5mm galvanized steel vertical studs at maximum 600mm C/C & similar additional vertical studs as necessary at abutments, ends...etc. Price includes fiberglass or similar approved insulation in cavity of Ducts & Access Panel for maintenance.(Rate only item)