I am refitting my bathroom and have discovered that the subfloor had no DPC and was extremely uneven. I have taken it out and re-laid about 5 inches of concrete over a DPC. I want to lay underfloor heating which I know I have to wait 3-4 weeks before turning on, but how long do I have to wait before I can lay latex levelling compound (to install the underfloor heating) and then tile? Thanks in advance for any advice.
