This is probably a daft question, but.... I'm laying 10mm warmup insulation boards on 18mm ply (no sub-floor below the ply). Warmup site says to use flexible adhesive, then screw the insulation boards using washers.
I am concerned that if I use a washer the screw/washer will not be flush with the top of the insulation board, so will make it difficult for the tiler. (My 'builder' mate told me that if the floor is not smooth as glass, the tiler will have problems...")
If the screw-head/washer is pround by a millimetre, will this make tiling difficult? I suppose I could drill out countersunk recesses for the washers, but this seems a lot of fanying around if not necessary...
Also, should the ply (structural spruce ply - EN636-2) be sealed with PVA before I lay the insulation boards?
Lastly, the warmup site calls for FG tape over the joins in the insulation board. I have some self adhesive plastering tape - will that do?
Many thanks
I am concerned that if I use a washer the screw/washer will not be flush with the top of the insulation board, so will make it difficult for the tiler. (My 'builder' mate told me that if the floor is not smooth as glass, the tiler will have problems...")
If the screw-head/washer is pround by a millimetre, will this make tiling difficult? I suppose I could drill out countersunk recesses for the washers, but this seems a lot of fanying around if not necessary...
Also, should the ply (structural spruce ply - EN636-2) be sealed with PVA before I lay the insulation boards?
Lastly, the warmup site calls for FG tape over the joins in the insulation board. I have some self adhesive plastering tape - will that do?
Many thanks