Bathroom flooring - WBP Ply or P5 Chip?

[bm057]

I'm currently renovating a first floor bathroom, and have removed the floorboards (split, badly damaged and smelt of wee).

I was planning to use 18mm P5 chipboard, but have been put off by bad reviews.

Would WBP Plywood be a better solution? If so what thickness should I use (joist 40cm apart)?

I'll be tiling over the boards.

Any advice greatly appreciate.

 

[Deluks]

25mm wbp will be rock solid. Never ever ever ever tile on top of chipboard. (actually never ever ever use chip as a floor )

Read the tiling sticky at the top of the tiling page for the full lowdown.

 

[bm057]

Ta. Much appreciated.