In an earlier contribution to this discussion,
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

It's probably not strictly necessary, but it won't do any harm - and will
stop any condensation from getting to the laminate. You can get underlay
which has a damp-proof membrane and a thin layer of foam combined, and is
easier to use than the separate stuff.
--
Cheers,
Roger
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