Warmup DWS300, Installation Manual

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Preparation of timber or concrete subfloor
Using WBP plywood
Ensure adequate underfloor ventilation.
Securely fix existing floorboards and if
necessary, pre-level with a latex/cement
self-levelling compound to give a flush fit
for the subsequently applied WBP plywood.
Refer to BS 5385: Part 3, clause 14.4
regarding sealing the backs and edges
of the WB plywood before fixing.
Fixing ply directly to the joists will not
provide a sufficiently stable floor finish
to accept tiles; fitting tongue and groove
flooring and then over-boarding with ply
or a tile backer board is recommended.
A rigid base is essential.
The above recommendations apply to floors
of small areas as advised in clause 14.4 of
BS 5385: Part 3: 1999.
Using insulated tile backer board
Fix the tile backer board as per
manufacturer’s instructions.
For best results and for ease of installation,
Warmup recommends the use of an
extruded polystyrene building or insulated
tile backer board with a cement-based
facing, such as Warmup
®
Insulation Board.
After attaching the board to the subfloor, the
Warmup
®
Undertile Heating System
may
be laid directly on top of the tile backer/
building board, and then tiled over. It is
important to ensure that the tile adhesive
and grout used are flexible and that the tile
backer/building board has been fitted as per
the manufacturer’s instructions. High quality,
cement-based adhesives with their flexible
additives are most suitable.
NOTE: Do not use the green Warmup
®
primer
when installing on insulated tile backer board.
Tiles Flexible tile adhesive
Heating wire Primer
18mm WBP plywood or Warmup
®
Insulation Board
Tiles Flexible tile adhesive
Heating wire Warmup
®
Insulation board
Insulation board adhesive
Subfloor
(concrete or timber)
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