The laths are thin strips of wood typically about 25mm by 6mm 1 by 14 inch nailed to the underside of the timber joists with a gap of about 6mm 14 inch between each lath. Measure the floor to calculate the area of a non-sloping ceiling Getty Images Image credit. Diy Gypsum Gypsum Board Preview 464 New Ceiling Design Ceiling Design For Living Room Ceiling Wooden Ceiling Design Ceiling Design Bedroom Ceiling Design Thickness of plaster-thickness of plaster is ranging between 6mm to 25mm their thickness depends on types of plastering. What thickness plasterboard for ceilings . Ill go with 12mm. Lath and plaster. Flexiboard is a 65mm thick plasterboard specially formulated for curved surface applications. There are two standard thicknesses of plasterboard 95 mm and 125 mm. Most types of plasterboard are comes in 95 or 125mm 38 or 12 inch thickness the thicker size has increased rigidity and is most often used. 95 or 115mm plasterboard for new ceiling Replacing old ceiling made...