Uneven wall surface
Where there are clean, sound brick, block or concrete walls, wedi Tilebacker
can be used to create the even and moisture-resistant surface essential as a
substrate for high quality tiled finishes.
Wall surfaces with considerable irregularities
(2) can be brought to
true using Tilebacker boards applied with either dabs or strips of suitable
adhesive. Ardex X 77 or X 77 S is one suitable material to use.
First, the wedi Tilebacker Board of minimum thickness 10mm is cut to length.
The Ardex X 77 or X 77 S is applied to the wall to provide perimeter strips
(1) or dabs to receive the Tilebacker board.
While the adhesive is still fresh and moist, the board is offered up and, using
a timber batten to spread the load, is beaten in to ensure a well-fixed, true
surface. It is then left for the adhesive to set and harden. Drill through the
wedi Tiebacker Board and adhesive dab into the wall and drive in wedi Dowels
at the rate of 5 per square metre.
A layer of adhesive is applied to joints and jointing tape (either TT25 Glass
Fibre Jointing Tape or WT50 Waterproof Joint Sealing Tape) is applied
(5)
while the adhesive is fresh. The tape is smoothed down with a taping knife or
similar tool to remove any air bubbles and achieve a firm bedding. A thin layer
of adhesive is now applied on top of the tape and feathered down onto the board
surface.
Tiles can be applied once the taping work has set. Again, Ardex X 77 or X 77 S
is an appropriate adhesive. In wet areas, a thin solid bed fixing technique
(4) should be used to ensure there are no voids behind the tiles.
Once the bed has hardened sufficiently, the spaces between tiles can be grouted
(8) with either the appropriate Ardex cement-based grout, incorporating
Ardex E101 admix or the appropriate Ardex-Flex cement-based grout.
Movement joints
(7) in the tile bed, such as between adjacent walls,
should be sealed with an appropriate sealant.
Flat wall surface
If the walls are flat, Ardex X 77 or X 77 S can be
applied either direct to the wall surface or to the wedi Tilebacker board (minimum
thickness 6mm) and combed out with an 8mm x 8mm toothed and notched trowel
over the complete board area to provide a ribbed bed. The board is then offered
up to the surface and tapped up true.
The boards are butt jointed.
A layer of adhesive is applied to joints and jointing tape (either TT25 Glass
Fibre Jointing Tape or WT50 Waterproof Joint Sealing Tape) is applied while
the adhesive is fresh. The tape is smoothed down with a taping knife or similar
tool to remove any air bubbles and achieve a firm bedding. A thin layer of adhesive
is now applied on top of the tape and feathered down onto the board surface.
Tiles can be applied once the taping work has set. Again, Ardex X 77 or X 77 S is
an appropriate adhesive. In wet areas, a thin solid bed fixing technique should
be used to ensure there are no voids behind the tiles.
Once the bed has hardened sufficiently, the spaces between tiles can be grouted
with either the appropriate Ardurit cement-based grout, incorporating Ardion
101 or the appropriate Ardu-Flex cement-based grout.
Movement joints in the tile bed, such as between adjacent walls, should be sealed
with an appropriate sealant.
Dowel Fixing
Where the wall is flat and solid, but it is not possible
to prepare the surface because of contamination or an unsound finish, it is
possible to fix the wedi Tilebacker to the wall using wedi dowels at the rate
of 5 per square metre.
A layer of adhesive is applied to joints and jointing tape (either TT25 Glass
Fibre Jointing Tape or WT50 Waterproof Joint Sealing Tape) is applied while
the adhesive is fresh. The tape is smoothed down with a taping knife or similar
tool to remove any air bubbles and achieve a firm bedding. A thin layer of adhesive
is now applied on top of the tape and feathered down onto the board surface.
Tiles can be applied once the taping work has set. Again, Ardex X 77 or X 77 S
is an appropriate adhesive. In wet areas, a thin solid bed fixing technique
should be used to ensure there are no voids behind the tiles.
Once the bed has hardened sufficiently, the spaces between tiles can be grouted
with either the appropriate Ardurit cement-based grout, incorporating Ardion
101 or the appropriate Ardu-Flex cement-based grout.
Movement joints in the tile bed, such as between adjacent walls, should be sealed
with an appropriate sealant.
