Replacing chipboard floor for bathroom tiles

Mike C · Post by **Mike C** » Wed Dec 31, 2008 1:33 pm

New member here, I've read a great deal of really useful advice on this site and hope somebody can help with this.

I'm intending to tile a bathroom floor which has chipboard laid (and floating) on polystyrene. Most of the chipboard has turned to mush so this has to go, most of it went up the vacuum cleaner anyway.

I think the best thing would be to replace the chipboard with plywood but I have no joists to screw it down on to so any joints are likely to flex. Would it be sufficient to put 2 layers of 12mm WBP ply down, upper layer turned 90 degrees from the lower and then screw them together?

The room is only 2m x 2m and tiles will not be natural stone.

Only-Me · Post by **Only-Me** » Wed Dec 31, 2008 5:10 pm

Put Vinyl down.

Floating floors are notorious for being a pain in the ar55e

Mike C · Post by **Mike C** » Sat Jan 03, 2009 12:32 pm

Thanks, had a feeling it was going to be a problem.

However, as this is a complete re-fit, I have access to the whole floor and it will be really easy to lift the lot up. Would it be possible to screw battens onto the underlying concrete and put ply onto those?

Do tell me if this is a silly idea or if it's going to create other problems.

The whole house is built like this and it really moves a lot in places. Every time the washing machine is used it buries itself further into the floor, but that's another job.

Thanks again.

Tryanything · Post by **Tryanything** » Sat Jan 03, 2009 12:56 pm

Depending on the height you may be able to reduce the thickness of
insulation and cement scread the floor and maybe install underfloor
heating