ply lifting in corners

[terry the tiler]

just priced a floor which has been plyed and is flat apart from round the wc and corners of the room, the ply tends to go upwards by around 10mm? meaning the tiles are gona rise at the edges totaly spoiling the job ! just wondering wot u guys / gals would do ?

[whitebeam]

How thick is the ply

[Oli]

Why is it lifting mate, cant you screw it down in the corners, is it the sub floor lifting and raising the ply with it, possibly water ingress warping the ply is it WBP?

[doug boardley]

if it's round the toilet, it sounds like it could be damp, swollen chipboard flooring under your ply

[Oli]

if it's round the toilet, it sounds like it could be damp

You got a confession to make Doug?

[whitebeam]

He'll blame the kids

[timeless john]

What would I do - I'd rip it all up ( wearing gloves) and chuck it in the skip!
Relay Hardie tile backer boards and make it a perfect job.
If te customer will not accept that tell them to hit the pot next time!

[terry the tiler]

ply is 6mm and might be the joists or something because the ply is all nailed and solid and dry !

[whitebeam]

6mm and nailed is not good, as timeless john reccomended

[Dave]

6mm ply full stop is not good..

[pete f]

rip it out back to joists replace with 25 mm wpb