do I need a dpm... wood on concrete

10 Nov 2005
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United Kingdom
We are putting 18mm oak down on top of concrete flooring. we have the fibreboard underlay, but the pack instructions are suggesting a dpm between the concrete and underlay.
The concrete has been down for a number of years, one room 10yrs plus, the other over three years, so no moisture issues.
There is a DPM and insulation surrounding and beneath the concrete.

So the Q is, if the concrete is dry and no further moisture can seep into it, do I still need a dpm between the concrete and underlay. or are wickes try to get me to spend £75 unnecessarily.
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With concrete of those ages and an intact DPM underneath you should have no problems without an additional DPM.
We do recommend to use an underlayment that does have a DPM - and why risk the manufacturers guarantee by "saving" £75 quid?

You would be better of returning the fibreboard to Wickes (7mm green plates?) which could result your floor ending feeling bouncy and replace it with a combi-underlayment (3mm foam with a DPM attached).
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