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I am planning to build my house. I chose the floor heating solution, I have large rooms (living room 42m², kitchen 13m², bedroom 16m²,...). I am undecided on the choice of the screed on the heating pipes, I inquired with friends who tell me that it is necessary to put a liquid screed (anhydrite) which allows a better coating of the pipes and thus a better yield, no need for expansion between the pieces eyc... On the internet I find the same arguments. So I put the question to my commercial to know what kind of screed he intended to put. He replied that they were putting on an anhydrite liquid screed. But during the development with the site leader he tells me that he would do the traditional screed because he had a better return on this screed than the liquid screed compared to the tiles and he was much more specialized with the screed tradi que the liquid but if I wanted I can ask the liquid screed. So I'm undecided because there are many more positive reviews on a liquid screed especially for performance, but the manufacturer that I take is pro tradi. I'm afraid if I take the liquid screed it is poorly made. What do you recommend as screed for underfloor heating? and for what reason? Thank you in advance for your answer

A fluid screed (or liquid) can be divided into two versions: anhydrous screed (based on very dry calcium sulphate) and cement screed.
Fluid screeds, in general, allow a very good coating of the heating network by the soil.
- The andhydride screed removes the splitting jointsbut it remains sensitive to moisture. It takes a long time to dry, hence the problems of sticking the tiles if it is done while the screed was not dry "at heart". Some professionals do not recommend their use in damp rooms, especially in case of accidental flooding (the screed can then swell).
The cement screedWhether fluid or conventional, is insensitive to moisture. A conventional screed is however, in theory, less efficient at the level of the coating, but the addition of plasticizers partly avoids this disadvantage.

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