Air barrier behind T&G paneling

We have some T&G paneling that is going to be installed on our walls and ceilings on a house we are building. Understanding that T&G paneling is not an air barrier we have typically installed Sheetrock first and installed our paneling over top the Sheetrock.

Our interior trim salesman says it is better to use OSB or plywood on the wall as sheetrock holds too much moisture and could cause problems with our T&G. He has been selling interior trim for about 30 years so typically trust his opinion.

I like the idea of having the OSB as an additional nailer and may eliminate some blocking but I feel like we will get a better air barrier with sheetorck since all joints will be finished. OSB would require some sort of tape or something and feel like most tapes do not adhere well to OSB. Also seems to me that OSB can hold more moisture than Sheetrock can.

Anyone ever had any issues with either of these techniques or have a preference?

Thanks.

Asked by Danny Kelly
Posted Tue, 01/17/2012 - 21:59
Edited Tue, 01/17/2012 - 22:00

Tags: Green building techniques

1.

I would Check with product manufacturer. Be wary of building/fire codes also for the proposed installation.

Answered by Mark Costa
Posted Tue, 01/17/2012 - 23:42

Edited Tue, 01/17/2012 - 23:46.

2.

If you are worried about wet sheet rock, I'd worry first about why all the water is there and prevent it, if possible, regardless of your air barrier. Did your salesman explain why there would necessarily be that much moisture? OSB off-gasses somewhat, and may not be the best product if anyone in the house has chemical sensitivities.

Answered by John Klingel
Posted Tue, 01/17/2012 - 23:50

3.

John,
There is no reason that the gypsum drywall should be damp. You can safely ignore the advice of this salesman.

Answered by Martin Holladay, GBA Advisor
Posted Wed, 01/18/2012 - 06:25