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I am going to install laminate flooring (without attached padding) on the concrete floor in my basement.

Do I need a moisture barrier in addition to the underlayment padding or does the underlayment padding also act as a moisture barrier?

For instance this product

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2 Answers 2

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After doing a bit more research the answer appears to be "it depends on the product."

Some pads are designed to also be a moisture barrier and some are not so read the product specifications.

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I'm not a fan of moisture barriers in basements but it likely would be a good thing under the floor. That said, it all depends on the flooring. The flooring will tell you exactly what you need to install it.

Personally, in a basement, I'd definitely add at least the pad...not so much for sound suppression (which is nice) but just to have a small thermal barrier between the cold concrete.

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No question a pad and some sort of moisture barrier is required. The question is do the padded underlayments also provide the required moisture barrier? Or do I need 2 separate products? –  Craig Apr 17 '12 at 20:17
    
ah! Sorry. I misunderstood the question. I suppose that would come down to the spec's of the particular underlayment/pad. The product you link to states that it can be used on below-grade floors. Does that mean concrete? I'm not sure. Maybe contact them directly and ask. –  DA01 Apr 17 '12 at 20:35

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