All tiling must be installed in accordance with the requirements of AS3958 part 1. Additional information on tiling may be obtained from the BRANZ publication ‘Good Tiling Practice’. Where a waterproof membrane is used, ceramic tiles are recommended. A tile adhesive that is compatible with the membrane must be used and comply with AS4992 – ceramic tiles – grouts and adhesives. GYPROCK ™ RESIDENTIAL SYSTEMS 44
CONSTRUCTION DETAILS – SHOWER AREAS 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 number of treatments for the shower wall junctions are available depending on the class of membrane. Membranes are classified as Class 1, Class 2 or Class 3, with Class 3 having the greatest elongation capabilities. • 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 or floor finish. PVC angle is to extend a minimum height of 1800mm from the finished floor surface. • Cut and fix the Gyprock Aquachek ™ , leaving a 6mm gap between the bottom edge of the sheet and the shower base, and where detailed, between sheets forming an internal corner. Neatly cut holes for plumbing penetrations. • Caulk around plumbing penetrations, and, where detailed, at sheet bases and internal corners with flexible sealant. • Joint plasterboard with Gyprock ™ Wet Area Base Coat and paper tape. • An appropriate liquid membrane is applied to the face of the Gyprock Aquachek ™ plasterboard before tiling. Follow respective manufacturers’ instructions. Apply membrane to the entire shower area to a minimum height of 1800mm from the finished floor surface. The membrane should extend 50mm minimum outside the shower area. Refer to FIG Z635 and Z636. • A compatible tile adhesive must be used to fix tiles to the membrane. Apply Gyprock Aquachek ™ to the wall framing, bottom sheets first, ensuring that the bottom edge of the sheet is kept 6mm clear of the floor (allowing for a mortar bed and/ or tiles where appropriate). Press the sheet firmly against the studs and fasten along one recessed edge at each stud, then fasten along the second recessed edge at each stud. Where tiles will be up to 12.5kg/m 2 , space nails or screws in the field of the sheet at a maximum 200mm centres. Internal corners, external corners, around openings and butt joints are to be fastened with nails or screws at a maximum 150mm centres, with fasteners opposite each other at all joints. Where wall tiles are up to 32kg/m 2 , space nails or screws at 100mm maximum centres to the field of the board, internal corners, external corners, around openings and butt joints. Corner boards may be omitted from tiled areas.
- Timber framing, Gyprock Plasterboard, Recessed Edge