2 in 1 underlayment

Old 06-17-14, 08:50 AM
gorth97's Avatar
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2 in 1 underlayment

I see a lot of 2 in 1, and 3 in 1 underlayments in the stores and online.

For laminate installations over concrete, if I use the 2 in 1 underlayment, does that mean I don't have to use the 6 mill poly moisture barrier because it's already included in the underlayment? Or is that something else?
Old 06-17-14, 11:30 AM
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If the underlayment is a vapor barrier in addition to a cushion designed for laminate then yes. You don't want a second barrier of poly. Pay attention to how the underlayments are seamed together. However, the underlayment also should be approved by the flooring manufacturer or it will void the warranty. Don't be under the assumption that thicker underlayment is better, too much flex can be detrimental to the flooring. Some Laminates have cushions already attached to the backside of the planks. You would need to add a vapor barrier, but not additional cushion.

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