... compliant to BS 1230: Part 1: 1985, sound, moisture and fire-check;Insulation: rigid mineral insulation, 40mm thick, density 25-35kg ... of BS 8233; the wall (incl. plasterboard) to provide fire stop for 60mins;4. Ceiling: 12mm Lafarge or other equivalent plasterboard wallboard ... compliant to BS 1230: Part 1: 1985, sound, moisture and fire-check, std dim's: 2440x1220mm; Standard plywood, 9mm thick, ...