The heating pipes should be installed according to manufacturer's instructions, fixed down and tested prior to being encapsulated in a screed or levelling compound.
If the pipes have been laid in a reinforced cement/sand screed this must be allowed to dry fully prior to tiling. A sand/cement screed should be left for 3 weeks with the underfloor heating off to dry. After this period the heating system should be turned on and raised by a maximum of 5°C/day until the maximum recommended operating temperature is achieved. This temperature should be maintained for 3 days and then the system turned off and the screed allowed to cool to 15°C before tiling commences.
If weberfloor flex levelling compound is used to cover the pipes instead of a cement/sand screed, the drying time will be considerably shorter.
Ensure that the cured surface of the floor is rigid, sound, clean, dry and free from any contaminating barrier. Prime with weber PR360 and allow to dry.