Which levelling compound, adhesive and grout should i use?
It is very important that you read the Thermowarm installation guide.pdf (967 Kb, right click to save) prior to any installation.
The adhesive should be of an S1 grade such as Single Part-Flexible Normal Set Grey Adhesive 20kg
The grout should be suitable for underfloor heating such as Mapei Ultra colour plus flexable grout 5kg. White 100.
The levelling compound should be suitable for underfloor heating such as Single Part-Flexible Levelling Compound 25kg.
Following the instructions for careful substrate preparation is paramount and should not be overlooked.