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Upstairs ensuite floor... which solution?
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[QUOTE="borrowdale, post: 986600, member: 59732"] Hello, I've started refurbishing my ensuite and I'm a bit overwhelmed by the number of options available for floor preparation. Have done a lot of googling and not found any threads on here which completely address the situation I have, so any advice would be really appreciated! The floor was previously 8mm porcelain tiles directly onto 22mm chipboard. A couple of them were cracked, and they lifted cleanly in about 2 mins with no adhesive remaining on the floor. Obviously not good so I want to do it properly. I'm planning to use 10mm rectified porcelain 60x30 tiles but not directly onto chipboard. The problem I have is that although the floor is solid and has minimal deflection (tried the glass of water test), there is a sag towards the centre of the room of about 8mm across a 1m spirit level. Ideally I'd like to have a perfectly flat/level surface to tile onto. The low point is on top of a joist. I did consider taking up the 22mm chipboard completely and re-laying 18mm structural ply (packing the joist), but the advice seems to be that ply should only be used for over-boarding and not for the floor itself. I was originally planning to use Hardiebacker with an S1 adhesive under and over it (priming the chipboard first), with the tiles on top, but now think I need to use some kind of self-levelling compound to level the floor. What brand of self-levelling can I use over the hardiebacker? Can I fit tiles to the self-levelling directly? I also read that Mapei renovation screed can be used to level chipboard. Could I lay ditra mat over that? [/QUOTE]
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Upstairs ensuite floor... which solution?
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