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Old 02-11-2010, 07:24 PM   #1
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Laun install help for vinyl flooring

I am ready to install some lauan on my subfloor but I have some questions. This is an old farm house that I have just finished replacing the subfloor on and the bottom side will be sprayed with the closed cell foam insulation. Do I need to lay down a vapor barrier on the subfloor before I install the lauan? If I do what do I use felt paper, plastic house wrap or another type of material. I am not sure if it would need a vapor barrier since the bottom side of the floor will be sprayed with the foam insulation.


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Old 02-12-2010, 06:01 AM   #2
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Closed cell foam is a vapor barrier.
You never want two vapor barriers because moisture can get trapped between them.


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Old 02-12-2010, 08:01 AM   #3
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The vinyl floor itself will be enough of a vapor barrier.
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Old 02-12-2010, 08:14 AM   #4
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Lauan is not the recommended choice for vinyl underlayment, if that is what you are installing, but I used it for years and never had a problem. It can have voids in the layers that can cause problems.
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