Hi all, I'm hoping you can advise me on a few things. We have recently had underfloor heating installed. All was going well however whilst the builder was fitting the system, I noticed that he was using Everbuild 708 levelling compound to embed the wires. I could see anywhere on the packet that it is suitable for UFH. The current situation is that the UFH is down and covered and 708 and looks well. However... I rang Everbuild and they have confirmed to me that 708 is not suitable for underfloor heating and may potentially crack in the future! This leads me to a few questions. How likely is the 708 to crack when the UFH is in use? Secondly, I have read about Durabase matting. Is it worthwhile me getting this put over what I currently have to ensure it doesn't crack? The builder refuses now to do anything more and it is a fair size area (20+ sq m) so I'm looking for a cost effective solution as it will cost me a fair bit to get it taken up. My plan was to have Karndean tiles fitted over this surface. I hope you can advise me in the right path as I'm pretty anxious and feel really let down and my kitchen is in a right state! Thank you.