Hi Phil Addison
In you wrote:
I think the reason the chipboard has started to curl up is because it gets
damp and is not treated in any way.

Quite right, but it's not just "curling up", what is happening is that
wet has got at it and it is expanding and disintegrating. Water
resistant grade should have been used, or preferably wood floorboards.
You will have to replace it sometime, either now or when someone's foot
goes through it!! At least find out why it's getting wet and put a stop
to that in the meanwhile. Since the sanitary ware is in place on it,
fitting ply (of dubious merit) is at least as difficult as re-doing the
job properly.

Having lifted a small section of the boards earlier this week I have now
discovered the source of the dampness. One of the hot water pipes
supplying the bath has a leak, but only when the pipe is hot. Hence the
funny smell around my flat - no baths from now on ;-)

The board I took out was rotten to about half way through the board, and it
took some extracting, as the pipework was installed in two stages, first
without the floor and then with. If I ever find out who put this in I will
throttle them!

Anyone got any rough ideas on the costs of replacing about 2sqm of
chipboard, and reinstalling sanitary ware? I would love to be able to
tackle the job myself, but I've never attempted plumbing before. Any hints
n tips would be gratefully appreciated.

Cheers,

--
Fishter
unhook to email me | http://www.fishter.org.uk/
And your point is?