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MASTERBOARD® can be applied over a steel or timber framework
as a tile underlay. When used in this application, the framing
should be at 400mm centres both vertically and horizontally.
Use minimum 9mm thick MASTERBOARD®. Seal the front face with diluted tile adhesive and
the back face with chlorinated rubber sealer or PVA sealer at the weight of 150g/m².
Sheets must be dry when installed.
Fasten panels into position using 32mm long, No.8 stainless
steel screws. Ensure fixing centres are at
a maximum of 200mm.
Screw heads must be countersunk below the surface of the boards.
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At butt joints between sheets, no filling is required. At maximum
3660mm centres, vertically and horizontally, expansion joints of minimum 5mm width should be included through
both tiles and
boards. Support boards each side of such joints.
At corner and floor joints, bed MASTERBOARD®
into silicone or polyurethane sealant to seal joints.
At all times, the tile and adhesive
manufacturers’ recommendations for tiling
onto calcium silicate or fibre cement board substrates
should be followed.
Do not have ceramic tile joints in line with
joints between sheets of MASTERBOARD®
except at movement joints. |
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