Non-Tiled Areas Jointing of Externel Angles/Arch Beads
Position external angle bead over the angle and sight it to ensure straightness before fixing with Cemintel Wallboard fasteners.
External angles and arch beads are to be jointed with a three coat system (excluding tape), and prepared as detailed for recessed joints.
Non-Tiled Areas Jointing of Internal Angles
Apply tape coat to both sides of the joint, bed the tape and lightly cover with compound. Allow tape coat to set/completely dry before proceeding.
Apply a finish coat ensuring that the edges are well feathered. Allow finish coat to set/completely dry before sanding.
Non-Tiled Areas Jointing of Butt Joints (Systems C, D, E, F, G or H).
Apply tape coat to both sides of the joint, bed the tape and lightly cover with compound.
The tape coat is to be spread approximately 150mm width each side of the joint.
Allow tape coat to set/completely dry before proceeding.
Apply a second coat, about 200mm width each side of the joint. This should have a gradual convex camber over the tape.
Allow compound to set/completely dry before proceeding.
Apply a finish coat centrally over the previous coat to form an even camber over the joint about 300mm width each side of the joint. Feather the edges with a trowel. (If required, soften the outer edges of the compound with a damp water brush before feathering).
Allow compounds to set/completely dry before proceeding.
When set/completely dry, sand compound smooth with 150 grit paper or with 220 grit sanding mesh. Avoid any heavy pressure which might scuff the joints. Decoration.
Where regulations require an impervious finish, such as to the walls adjoining or behind a bath, or for walls of a shower recess, the Cemintel Wallboard in those areas must be finished with ceramic tiles. Other areas must be painted or wallpapered.
For best results, the surface of Cemintel Wallboard should be primed with a high quality latex primer before painting. Paint manufacturers' instructions are to be followed in all cases.
For best results, the surface of Cemintel Wallboard should be sealed with a pigmented oil base sealer before applying wallpaper or other decorative materials.
Tiles shall be installed in accordance with AS3958.1. Allowance must be made for expansion/contraction by leaving a gap between adjoining tiles in vertical corners. Fill gap with flexible wet area sealant. Refer to section on Control Joints for additional requirements. The tiler must ensure that all loose dust and foreign matter are cleaned off the surfaces to be tiled. Proprietary tile adhesives that meet AS2358 : 1990 'Adhesives for ceramic wall tiles and mosaics' are recommended. For best results, spread adhesive directly onto the surface to a depth of about 3mm, then 'rib' in a horizontal direction with a notched trowel having approximately 4.5mm x 4.5mm notches. Tiling to be in accordance with the tile adhesive manufacturer's instructions. A compatible tile adhesive must be used to fix tiles to proprietary membranes.