On Sun, 29 May 2005 13:13:48 +0000 (UTC), Gaffar
wrote:

The other qestion is, are 18mm water resisitant Tongue & Cheek chipboard
panels
suitable for 1st flooring (especially in a shower room)

According to building regs it is:

http://www.google.co.uk/search?hl=en&c2coff=1&q=water+resistant+chipboard+ odpm&spell=1

Still, I'd seal it with a couple of coats of something decent like
marine varnish and tape the joins with aluminium tape. If you can
seal the edges too and a border round the underside before laying even
better.

Whatever you use if it stays wet for a long time it will rot unless
treated, so sealing is a good way to go.

If tiling on it check with adhesive manufacturer for compatiblity with
your sealer of choice.

cheers,
Pete.