In article ,
S Almond wrote:
They're usually made in such a way as they shouldn't warp under normal
circumstances.

These doors warp if they get damp. Full stop. They're designed to go to
12% moisture (and have been taken to 18% in the lab) without warping -
and that's not very damp at all. If you've been using the bath or
shower, the air on the corridor side of the door may have reached 20%+.
There's no known cure. In short, immediately paint 'em on 6 sides (like
it says on the instructions!), or they warp!

Yes if it's of traditional construction. But these days it's often cheaper
to make the door out of 'plywood' or blockboard with a plain veneer rather
than solid timber which will be far less susceptible to warping.

--
*I never drink anything stronger than gin before breakfast *

Dave Plowman London SW
To e-mail, change noise into sound.