For non tiled areas, position fasteners at 300mm maximum centres in the body of the sheet, and at 200mm centres at internal angles, external angles and butt joints.

Tiled Areas

Position fasteners at 200mm centres maximum at sheet edges and ends, internal and external angles as well as in the body of the sheet. Cemintel Wallboard, to be used as a substrate for tiling, must be fixed to the framing with nails or screws. Use of stud adhesive is NOT acceptable. These fixing details are suitable for wall tiles up to 20kg/m2 in weight. For wall tiles up to 32kg/m2, sheets must be fixed at 100mm maximum centres to all studs. Alternatively the adhesive/fastener system may be used. Apply 25mm x 15mm walnuts of Gyprock Stud Adhesive at 230mm maximum centres to intermediate studs. Hold sheet against studs for 24 hours by fasteners driven through temporary fibre cement blocks in the centre of sheet at every second stud. Fasteners are to be applied at sheet edges as shown in the diagram. Note: Walnuts of adhesive must NEVER coincide with fastening points.

Flashing of Wet Areas

Perimeter flashing must be used at the floor/wall junctions in all general wet areas, and must extend a minimum of 25mm above finished floor level. A number of methods can be used:

Perimeter Angle Flashing: PVC flashing, 75 x 50mm, adhered to floor only to allow for frame movement.

Perimeter Flashing for Step-Down Concrete Slab: For example Hypalon Flashing Strip 130mm width. Nail flashing to the bottom plate at a minimum 25mm above bottom of wall plate. Ensure flashing extends down to cover slab recess. Leave a 6mm gap between the wallboard sheet and the mortar bed and fill with flexible sealant.

Perimeter Insitu Membrane: For example ABA Superflex I, applied with bond breaker. Where appropriate and/or where required by building regulations, the membrane is to extend across the entire floor and into the waste. Shower Recess Construction.

Preformed Shower Base

A preformed shower base has the advantage of being easy to install over floors of timber, compressed fibre cement sheet and concrete slabs, as well as ensuring that the wall linings are kept clear of any free water likely to accumulate on the shower floor. A preformed shower base must be installed before the wall linings. Cut and install PVC angle to internal corner, fixing the angle to studs at 600mm centres.

Carry angle down over the shower base lip, stopping 6mm above shower base. PVC angle is to extend a minimum height of 1800mm from the finished floor surface. Cut and fix the Cemintel Wallboard, leaving a 6mm gap between the bottom edge of the sheet and the shower base, between the sheet and the floor, and between sheets forming internal corner. Neatly cut holes for plumbing penetrations.

Caulk around plumbing penetrations, the gap between the Cemintel Wallboard and the shower base, and up internal corner of shower with flexible sealant. NOTE: Australian Standard AS3740 states that " The height of the sides of a shower tray above the highest point of the finished floor surface shall be the greater of " i) 75mm; or ii)25mm above the maximum possible water level in the shower compartment.

Externel Shower Base

Install the shower tray, as per the regulations, prior to the installation of the wallboard. Cut and install PVC angle to internal corner, fixing the angle to studs at 600mm centres. Carry angle down inside the shower tray, stopping as detailed in FIG 13 or 26. PVC angle is to extend a minimum height of 1800mm from the finished floor surface. Cut and fix the wallboard, leaving a 6mm gap between the sheet and the floor, and between sheets forming the internal corner. Neatly cut holes for plumbing penetrations. Caulk around plumbing penetrations, the gap between the Cemintel Wallboard and the shower tray (or mortar bed), and up the internal corner of shower recess with flexible sealant.

Insitu-Formed Internel Shower Tray

Install flashing angle to wall/floor junction. Cut and fix the wallboard, leaving a 6mm gap between the sheet and the floor, and between sheets forming internal corner. Neatly cut holes for plumbing penetrations. Caulk around plumbing penetrations and up internal corner of shower with flexible sealant. Proprietary liquid membrane materials are applied to the face of the wallboard and floor to form an insitu internal tray. Follow respective manufacturers instructions. Apply membrane to the vertical corner to a minimum height of 1800mm from the finished floor surface. The flashing membrane is to extend 75mm minimum each side of the corner. A compatible tile adhesive must be used to fix tiles to the membrane. Important: Only insitu membrane materials appraised by recognised authorities are to be used. ,p> For example ABA Superflex I. Bath, Shower Over Bath and Unenclosed Shower Installations.

Shower Over Bath And Uneclosed Shower

Install flashing angle to wall/floor junction. Cut and fix the wallboard, leaving a 6mm gap between the sheet and the floor, the sheet and the bath, and between sheets forming internal corner. Neatly cut holes for plumbing and bath penetrations. Caulk around plumbing and bath penetrations and up internal corner of shower with flexible sealant. Proprietary liquid membrane materials are applied to the face of the wallboard and the floor. Always follow respective manufacturers instructions. For showers, apply a membrane to the vertical corner to a minimum height of 1800mm from the finished floor surface. The flashing membrane is to extend 75mm minimum each side of the corner. A compatible tile adhesive must be used to fix tiles to the membrane.

Important: Only insitu membrane materials appraised by recognised authorities are to be used. For example ABA Superflex I.