We are faced with a choice: cement screed or anhydrite screed, popular lately. Now there are different opinions about it in terms of price, accuracy and thermal conductivity. If most claims are to be believed, anhydrite screed is much better at transferring underfloor heating heat. In a YouTube video, I saw just the opposite. What's right now?
A flow screed hugs the pipes better than a cement screed.
Cement in the basement and bathrooms. In other cases, anhydrite. This is usually the best way to go.