12mm thick SOLID moisture resistant gypsum board, screwed to galvanized SOLID main tees and SOLID cross tees. SOLID main tees installed at 1200mm centers with SOLID cross tees clipped in at every 400mm centers. SOLID 25 x 25mm x 0.6mm angles hangers fixed at 1200mm centers all supplied and installed as per “SOLID Ceilings” instructions. Including full surface to be 3mm SOLID HandSkim plastered, sanded, and finished smooth.