On Tue, 22 Nov 2005 17:56:02 +0000, Nigel Molesworth
wrote:

I've ordered an undermount sink for the kitchen. The worktops are
going to be granite, and the granite supplier suggested fitting the
sink to the base unit with MDF, such that the lip of the sink is the
same height as the top of the carcass.

Has anyone had any experience of MDF in this situation? Isn't it prone
to damage by water? Wouldn't treated chipboard (or even an off cut of
the old worktop) be better?

Hi,

If using MDF look for a moisture resistant grade IIRC it's called
something like 'P5'.

Whatever you use, MDF, ply, marine ply it will all rot eventually if
it gets wet and stays wet, so it's a good idea to seal it, PVA, paint,
wood stain would do.

Also to check moisture resistance of MDF or ply just boil an offcut in
water for some time.

cheers,
Pete.