Reallyme

Thank you for the info guys - you gave me lots to look into There isn't much movement in the suspended floor at the moment - just a couple boards that could do with tightening down. Would ply used to bring the levels up also help provide any stiffness there too? There is some rewiring and plumbing to be done yes, mostly under the suspended floor section - does that change things at all? It sounds like my best bet would be; - ply to bring the levels up - self levelling compound the whole area, or, if things are pretty flat after the ply maybe just do self levelling compound in some areas & feather the edges? - decoupling mat the whole area - expansion joints in the door ways - how long of a tile run is ok without joints? 2 of the 3 doorways are well suited for them, but 1 doorway would break the brickbond pattern. Without a joint in that door way, the length of that tile run would be about 8.5m - is that too long without an expansion joint?

Hi all I'm looking to tile a large part of my downstairs ideally without thresholds or level changes between the doorways and where the currently-different floor sections join. But, the sub floors are a mix of materials and levels right now. We have; - About 30m2 of very new chipboard flooring that is about 10mm higher than the adjoining; - 10m2 of old concrete+screed flooring, which itself is about 3mm higher than the adjoining; - 23m2 of suspended timber flooring So about 13mm height difference between highest and lowest subfloors with the concrete+screen section acting as a go-between The tiles I'm planning to put down are 600x400 porcelain Do you guys have any recommendations with respect to dealing with the level and material changes?