Hi, I'm sorting out tiling my basement floor. The floor is concrete with a concrete upstand all round (i.e. a paddling pool. The concrete isn't very level as being a basement you can't get outside it to level it. Anyway I'd like a level surface to tile on. Current variation is of the order of 0-10mm and it's pretty level on average as they did use a self levelling laser when attempting to float it flat.
To find out how uneven it is I was planning (after priming it) to use water to find the highest point by basically filling it up (water being very self leveling AFAIK!). Having a rough plan of how much filling needs to be done I can then hoover up the water using the wetvac I already have.
The real question is can I use a cheap self-smoothing compound to fill the worst spots until I'm within say 3mm of level, and the use a more expensive latex levelling compound to finish off (and bury the underfloor heating cable in. What I'm concerned about is the interface and bond between the self smoothing and self-levelling compounds.
Any thoughts?
Fash