Specifications

STANDARD SPECIFICATION - BUILDINGS
DPI REFERENCE TEXT - APRIL 2009
PAGE 27
TILING
Absorbent substrates: If suction is excessive, control
it by dampening but avoid over-wetting and do not
apply mortar bedding to substrates showing surface
moisture.
Dense concrete: If not sufciently rough to provide
a mechanical key, roughen by scabbling or the like
to remove 3 mm of the surface and expose the
aggregrate; then apply a bonding treatment.
13.3 INSPECTION
Notice - Witness Point
Witness Point: Give sufcient notice so that an
inspection may be made at the following stages:
• Completion of waterproof membrane.
• Initial or trial set out.
13.4 SAMPLES
General
If required submit labelled samples of tiles, including
ttings, accessories, grout and sealants, illustrating
the range of variation in colour and nish.
13.5 WATERPROOFING WET AREAS
Standard
General: To AS 3740.
Membrane: To AS/NZS 4858.
Membrane
Provide a proprietary (non acrylic) liquid applied
or sheet membrane system for use in wet areas,
shower recess bases and associated oors and
wall to oor junctions which are to be tiled.
Proprietary Item: Bostik Dampx 2.
Installation
Floor wastes: Turn membrane down into the oor
waste puddle anges, and adhere.
Hobs: Extend membrane over the hob and into the
room at least 50 mm. For hobless showers extend
1800 mm into the room.
External tiling: Provide a waterproof membrane
under external oor tiling, to balconies and over
habitable rooms, which forms a drained tank
suitable for continuous immersion. Do not run under
bounding walls.
Curing: Allow membrane to cure fully before tiling.
13.6 TILING
Cutting
Cut tiles neatly to t around xtures and ttings,
and at margins where necessary. Drill holes without
damaging tile faces. Rub edges smooth without
chipping.
Laying
Return tiles into sills, reveals and openings. Butt up
to returns, frames, ttings, and other nishes.
Variations
Distribute variations in hue, colour, or pattern
uniformly, by mixing tiles or tile batches before
laying.
Protection
Keep trafc off oors until the bedding has set and
attained its working strength.
Setting out
General: Set out tiles to give uniform joint widths
within the following limits:
• Internal ceramic tiling: 1.5 - 3 mm.
• Mosaic tiling: As dictated by pattern.
• Quarry tiles: 6 - 12 mm.
• Vitried oor tiles: 3 - 5 mm.
• Stone tiles: 1.5 - 3 mm.
Joint alignment: Set out tiling with joints accurately
aligned in both directions and wall tiling joints level
and plumb.
Joint position: Set out tiles from the centre of the
oor or wall to be tiled and if possible, ensure cut
tiles are a half tile or larger.
Fixtures: If possible, position tiles so that holes
for xtures and other penetrations occur at the
intersection of horizontal and vertical joints or in the
centre of tiles.
Falls and levels
General: Grade oor tiling to even and correct falls
generally, and to oor wastes and elsewhere as
required. Make level junctions with walls. If falls are
not required, lay level.
Minimum fall generally: 1:100.
Minimum fall in shower areas: 1:60.
Change of nish: Maintain nished oor level across
changes of oor nish including carpet.
Preparation of tiles
Adhesive bedding: Fix tiles dry.
Mortar bedding: Soak porous tiles in water for half
an hour and then drain until the surface water has
disappeared.
Terracotta Tiles: Use presealed tiles or apply a
breathable sealer.
Floor nish dividers
Finish tiled oors at junctions with differing oor
nishes with a corrosion-resistant metal dividing
strip xed to the substrate. If changes of oor nish
occur at doorways, make the junction directly below
the closed door.
Bath ventilation
Ventilate the space below fully enclosed baths with
at least 2 ventilating tiles.
Sealed joints
Fill joints with silicone sealant and nish ush with
the tile surface where tiling joins sanitary xtures
and at corners of walls in showers.
Proprietary Item: ABA Colourex silicone sealant to
match the colour of the grout..
Movement joints
Provide movement joints over structural joints and
at walls or to divide tiled areas into bays a maximum
of 20 m
2
and 5 m wide. Provide joints 6 to 12 mm
wide to suit the tiling pattern and ll with a colour
matching silicone sealant over a foam backing rod.
Specifications March 2009.indd 27 11/03/2009 11:47:11 AM