When installing Fastwarm® insulation boards we recommend a minimum of a 3mm bed of flexible tile adhesive. This depth would be dependant on the subfloor. Should there be concerns of unevenness, a deeper bed will be suggested.
When tiling directly over the Fastwarm® underfloor heating systems we recommend a 7mm bed to ensure cables are fully covered and tiles are fully adhered to the surface.
Please ensure all surface are primed with the primer supplied within your kit. If you're looking to source a primer to go with your adhesives, see our range of primers here.
To correctly calculate the amount of adhesive you require use the follow formula or our product calculator.