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We've just done the same to our bathroom - as airhead says it's pretty standard. I chucked some extra noggins (from one joist to the other) in between the joists to try and stiffen as much as possible then 18mm ply went on top, followed by cheap ditra alternative, then tiles. you still end up with a bit of a threshold step though.
In a previous bathroom a builder did, we wanted the tiles to be the same level as the adjacent original flooring. the builder put battens 18mm below the joist then sat pieces of 18mm ply inbetween joists. i think they then just put the membrane straight onto this (was a wet room) and then tiled.
With hindsight this was a shit idea and i had to regrout every 6 months because the grout lines popped - on a tangent, i would highly recommend "fix-a-floor" though to fix loose tiles.
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terlg
Fantastic, thanks!
Another query for anyone/everyone - bathroom (currently being disassembled) has floorboards (under ply, under tiles) as the OG floor (house is c.1906), and one of my wife's biggest pet peeves is thresholds and steps up/down into rooms.
I was looking at using something like Ditra matting, or it's cheaper cousin Dural Ci - and playing with the idea of taking the floorboards up, laying 18 or 24mm (?) of ply on to the joists, then the mat, then floor tiles to attempt to keep the level as close to the rest of the landing.
Joists are spaced every 40cm or so - does that sound feasible? Or am i missing something silly (other than fact I appear to have paid £££ for a civil engineering degree where I appear to have learned next to nothing about structures...)