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The3rd Earl Of Derby wrote:
wrote:
Hi,

Advice needed....

I'm renovating an old office and I'm intending to lay 22mm T&G
chipboard over the existing floorboards as they are very old, a little
uneven, and unsuitable for carpet tiles. I was wondering whether it
would be helpful to put 10mm-25mm of expanded polystyrene under the
new chipboard to take up some of the bumps and lumps of old nails,
damaged boards etc as well as possibly improving the sound insulation
between floors. Is there any possibility that the polystrene and the
chipboard could react over time? Would a wood pulp sheet material be
more suitable.
snip
I think you would be better of with sheet material layed down(chipboard)
rather than T&G but you will still have to knock in any protruding
nails/screws.

Actually, as long as they protrude less than the polystyrene is thick,
they'll just punch into it, with no impact on the chipboard.