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Old 12-31-2011, 08:26 AM   #1
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What kind of vapor barrier for hardwood?


Happy New Year!

I have a question about vapor barriers. We are installing 3/4" x 3-1/4" oak over 3/4" plywood and need to select a vapor barrier. It's a 30 y.o. home build over a crawl space. Southern Illinois - lots of t-storms in the spring.

What would be the best barrier? I have some floor leveling to do and suppose I will start with 30 lb felt for the big gaps. Okay? I saw a cool YouTube video where the guy was using "door skin" but have been unable to find it anywhere.

Went to LL yesterday and the sales guy said that felt was "old school" and I should use their Eco Silent Sound HD or a silicone barrier.

So, what do you experts say? Felt? Red Rosin? Silicone? Waxed paper? Saran wrap?

Thank you very much!

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Old 12-31-2011, 08:33 AM   #2
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What kind of vapor barrier for hardwood?


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Originally Posted by MurphyMan View Post
I have a question about vapor barriers.
We are installing 3/4" x 3-1/4" oak over 3/4" plywood
and need to select a vapor barrier.
If you're going to install a vapor barrier it really belongs below the subfloor along with the insulation; not above all of that. Above the subfloor (in the heated space)... old school rosin paper should be plenty enough to install your new flooring with.

hth


Last edited by TarheelTerp; 12-31-2011 at 08:36 AM.
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Old 12-31-2011, 09:04 AM   #3
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What kind of vapor barrier for hardwood?


Maybe vapor barrier is the wrong term? The house has backed fiberglass insulation between the joists, held up with chicken wire.

I am trying to choose a good interface between the oak flooring and the plywood. I am looking at a publication from the National Wood Flooring Association that says "Do not use common red rosin or building paper which is not asphalt saturated. They are not vapor retarders as their perm rating is far greater than 50".

Last edited by MurphyMan; 12-31-2011 at 09:24 AM.
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Old 12-31-2011, 09:28 AM   #4
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What kind of vapor barrier for hardwood?


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...the National Wood Flooring Association that says "Do not use common red rosin or building paper which is not asphalt saturated..."
That describes tar paper.
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Old 12-31-2011, 09:57 AM   #5
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What kind of vapor barrier for hardwood?


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Went to LL yesterday and the sales guy said that felt was "old school" and I should use their Eco Silent Sound HD or a silicone barrier.
Imagine him saying that when he had another product to sell to you?
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Old 12-31-2011, 03:00 PM   #6
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What kind of vapor barrier for hardwood?


Cupping of wood floor, need input

Gary

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