What floor boards for bathroom?

Standard will be okay but you can go for the slightly more expensive water resistant version if you want peace of mind. We did but I don't anticipate the floor being soaked now we have sealed it and tiled it.
 
If you're looking at floor sheets there's 18mm and 22mm.. check which it is as I didn't!

I went for the water proof (green stuff) simply because a small gap, once the water is in will expand. Thing is I think the stuff looses it's water proof nature over time anyway as the old panels soaked up the splashes when the floor was pulled up.

The 18mm got reused as tool boards in the garage.
 
If you're looking at floor sheets there's 18mm and 22mm.. check which it is as I didn't!

I went for the water proof (green stuff) simply because a small gap, once the water is in will expand. Thing is I think the stuff looses it's water proof nature over time anyway as the old panels soaked up the splashes when the floor was pulled up.

The 18mm got reused as tool boards in the garage.

And it needs to be 22mm or you bought two types? :p Seems places stock 18mm more than 22mm (Wickes and Selco for example, B&Q don't stock any).
 
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Are you planning to replace the floorboards? Can't you just put some plywood over the existing boards and tile on to that? Or is that what you are intending to do?
 
Are you planning to replace the floorboards? Can't you just put some plywood over the existing boards and tile on to that? Or is that what you are intending to do?

Half the floorboards are old, knackered or missing so yes I'm just going to replace it all.

Oh for tiles to be laid on?

You should ply line even if you have green boards down.

Yes, for floor tiles.

So, joists > green MR boards (18 or 22) > ply?
 
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Half the floorboards are old, knackered or missing so yes I'm just going to replace it all.
Yes, for floor tiles.
So, joists > green MR boards (18 or 22) > ply?

Yes- green board on the joists, then ply on top.

From experience the green stuff will need supporting batons between the joints under it where you have a non-tongue and groove join. Then ply on top. Nail in place and I'd still use the flexible wood flood adhesive.

Just make sure you have adequate ventilation with that stuff..
 
Ha, thanks. Just remeasured the bathroom now the bath panel etc is off and the room is exactly 2440mm, which is quite handy. There's obviously a reason as to why the boards all come in 2440mm but rooms aren't a standard size surely?!

Makes things simpler anyway, only 2 boards needed.
 
You'd be better off with ply if your tiling, can get thicker stiff. Stiffer than MDF too.

Prob worth adding some noggins to the joists too to help strengthen it up.
 
You'd be better off with ply if your tiling, can get thicker stiff. Stiffer than MDF too.

Prob worth adding some noggins to the joists too to help strengthen it up.
 
I'm so far in now I may as well do it properly :p.

The ply on top, how thick does that need to be given the 18mm MR MDF underneath? Does it still need to be 18mm or can it be much thinner? Just worried that with two lots of 18mm, plus adhesive and tiles the floor's going to be some 50mm thick.
 
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