Smoothing material to flatten not level?

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I am preparing to tile a bathroom wooden floor in an old cottage. I need to alter the height of some small areas before laying insulating cement boards. If I were to level the floor it would raise the door threshold more than I want. So I'm aiming for a flat floor, not a horizontally level floor. I was planning to used tile cement adhesive as smoothing agent. Will this be OK or is there something else that I could use? I don't want something that will flow to a level.
Any advice gratefully received.
 
I'd use rapid set adhesive and bridge the low points with a feather edge or plasterers darby. Could use self leveller but it will set you back a day while it dries
 
Rapid leveller, tile after 1 hour. Don’t put too much down and mix it on the less watery side and it will be perfect
 
Or if you want to really use adhesive, I'd suggest BAL stone & tile ptb. Can be used thick and up to 25mm depth.
I'd disagree with using rapid level 30 (if that's the one you're thinking of localtiler) it's brilliant stuff but also brilliant at flowing level, even with less water)
 
Depends how thick it’s needed, can be mixed thicker to stop it flowing so well. If your going thick like 10mm then it’s not gonna work
 
If a pro says it's difficult to use tile adhesive, I'll think again.
How about some of the levelling compounds suggested above, if necessary used in in layers?
 
How uneven is this floor, any photos? If you pour levelling compound at one end of the room, it’s not gonna run to the other unless your pouring a real load of it.
 
Ardex feather finish. It's like filler bit pricey and don't know what maximum thickness is
 
Sadly I'm not at the location so a photo is not possible.
I estimate the maximum thickness is about 9mm.
I read that Ardex feather finish is not up to this depth.
If is was not a wooden floor ( to be covered with cement insulating board) I would put a mortar mix down and with straight edge timbers I would drag and tamp it to a flat finish.
 
If your sticking boards down with tile adhesive anyway just make good the worst areas and stick them down!
 

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Geoff Stafford,
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Flintstone,
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Geoff Stafford,
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