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Originally Posted by Joe T
I'm about to replace a carpet (laid on concrete) with laminate flooring.
Instructions mention using an underlay with a vapour barrier. However, don't
concrete floors in houses already have a damp proof membrane incorporated?
Is the vapour barrier only required in a new house where the concrete has not
yet fully dried out? Or is there some other dampness factor I am missing?
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If the instruction mention DPM, use it. If any problems occur later, your warrantee will be useless.
Plus the DPM underneath the concrete has nothing to do with protecting your wooden flooring on the concrete itself. We always use DPM when installing wooden flooring on concrete/screed underfloor: a - hardly any extra costs, b - better protection against any residue moist in the concrete floor (however old)
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