Double layer of SOLID 15mm fire rated gypsum board, screwed to SOLID steel brandering at every 300mm centers suspended by SOLID 25 x 25mm x 0.6mm hangers and SOLID galvanized studs at every 600m centers. Supplied and installed as per “SOLID Ceilings” instructions. Including SOLID hanger brackets, SOLID galvanized fire strap and full surface to be 3mm SOLID HandSkim plastered, sanded, and finished smooth.