Technical
How do I fix to a cement-sand screed with underfloor heating?
The screed should be a minimum of 3 weeks old before the heating is brought to its intended operating temperature and maintained at that temperature for a minimum of 3 days. It should then be allowed to cool to room temperature before ceramic tiles or natural stone are fixed.
Tiles should be fixed in a highly polymer modified cement-based adhesive and grouted with either a ‘flexible’ CG2 grout or a CG1 grout with the addition of a flexible additive (refer to tick charts).
The heating may be switched on 14 days after completion of tiling, raising the temperature gradually at a rate of 5oC per day.
For free technical advice on the Norcros and Johnsons product ranges please call 0870 609 2851 or click here to email.
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