Hello everybody. My first post on here; any advice and pointers greatly appreciated. Ground floor extension c45m2. Wet UFH system under 50mm of calcium screed (thermio plus). Screed went down 4 weeks ago (sanded down after 2 weeks). Final tile is a 600 x 300 porcelain. I have had several tilers around and am getting conflicting views on how to approach this job. One tiler has said that ditra matting is a must between the screed and tile. While others have said not required. Also seem to be variation in the adhesive; some say a cementious one as ok; others not. Any thoughts on the need for ditra matting, the type of adhesive and any other pointers are very much appreciated. Thanks in advance.