Bathroom floor

Our current floor is tongue and groove but with significant gaps and the boards are slightly convex.
SWMBO would like something better than the existing carpet tiles but I realise I need to overboard it in some way. I guess I need something like 10mm ply but I really am concerned about making a step as my wife is always tripping. Could I get the floor sanded flatter and get away with something thinner to overbard it before tiling? Could I use a floor leveling compound?
Not sure if I want ceramic - possibly a lino plank type of covering.
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it will be a trip hazard whatever you do I feel, unless you want to remove the boards and start from scratch again. Brian
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DerbyBorn wrote:

Punch the nails below the surface then use a small block plane to flatten the raised portions of the boards, I did this when fitting oak flooring over floorboards (also replaced a couple of boards that someone had lifted/butchered).
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Our builders simply stapled thin ply over the 9" floor boards here. 26 years ago so perhaps 0.25" prolly 5.5mm now. I didn't notice them doing any serious preparation work.

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replying to DerbyBorn, Iggy wrote: Yep, you can sand them quite flat or Plane them like Andy said. Presuming you'd be removing any cabinetry and the toilet for the new floor and therefore keeping the same height to the user, then you'd really just need a new (thicker or 2nd layer) door threshold. Yes, the new threshold would, possibly, need some getting used to, but there won't be any secondary floor lip that will catch most anyone.
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On 20/11/17 17:39, DerbyBorn wrote:

3mm hardboard BUT get the floor flatter first.

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On Tuesday, November 21, 2017 at 2:39:30 AM UTC, The Natural Philosopher wrote:

Replacing the boards with moisture resistant mdf would give you the same level. I wouldn't take a chance with ceramic because, however much you reinforce the floor, there may still be slight movement in the joists.
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On Monday, 20 November 2017 17:39:17 UTC, DerbyBorn wrote:

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If you are going to tile you'll need a flat and stable surface. Replacing t he floorboards with 18mm WBP ply would be prudent but you'd still need to e nsure the foor is properly supported so there will be no movement which can promote cracked grout or worst case tiles.
Also, don't underestimate how cold ceramic tiles will be if you are walking in there with bare feet. I fitted electic UFH and with the insulation, the heating wires embedded into SLC, the tiles and adhesive there was a 20mm s tep up into the bathroom.
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What sort of floor covering do you intend using? Makes a difference to how flat the original needs to be.
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On 20/11/17 17:39, DerbyBorn wrote:

A 10mm step is OK if you put in a 3-4" threshold and chamfer it so there's no actual step to trip on. I've got several (in 3 cases it goes up nearer 20mm).

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+1. I ended up doing that in a loo, two houses ago.
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