On Sun, 02 Sep 2007 12:13:06 GMT, jonjo wrote:

I have a solid floor with the old type hard composition Marley tiles
on top.
Is it necessary to put a polythene damp proofing membrane down before
laying insulation material & then the planks etc. ?

Thanks for any help

I used cheap plastic sheeting for mine. it was about £3 for 5mx3m
sheet in b+q.
Was stored over with the blue tarps in the building section not in the
flooring bit.