Best wood to replace bathroom floor

longwalks1

we are due to renovate our bathroom and under the old tiles it’s a combination of creaky, original floorboards and chipboard. We’re going to retile it and use Ditra Matt, should we replace the boards & chipboard  and if so, replace it with what? 

neilmcl

I've no idea what "Ditra Matt" is or why you're planning on using it but if there's nothing actually wrong with the floorboards than them being a bit "creaky" then that can easily be remedied, you don't really want to be replacing them. As far as the chipboard is concerned, that was there for the tiles so it will depend on what the manufacturer's recommended sub floor requirement is for your new flooring.

longwalks1

Hi neilmcl - this is ditra matt, to prevent any movement of tiles.
https://www.schluter.co.uk/ditra-25.aspx
I’ll have a look and see what sub floor is recommended for the floor tiles I’ve bought

Doozergirl

Ditra matting is a decoupling membrane.  You use it to reduce differential movement between the tile and sub-base. 

Cement board is widely used now as a sub-base in bathrooms as it's incredibly tough and provides an ideal base for adhesive. If the floorboards aren't reliable then you can replace those with a decent thickness of ply and then cement board over.   It's more important to remove the risk of movement than work with it. 
 

I wouldn't bother with the ditra mat in there unless it's a massive room or you are still worried about bounce in the floor joists.  

Just create a solid base.