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<font face="Helvetica, Arial, sans-serif">This is my experience and
recommendation as well.<br>
However, in lieu of rigid drywall, you could use rigid foam
insulation with the joints taped under the T&G. Two layers
with the joints offset is always even better.<br>
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<pre class="moz-signature" cols="0">Dr John Straube, P.Eng.
<a class="moz-txt-link-abbreviated" href="http://www.BuildingScience.com">www.BuildingScience.com</a></pre>
<br>
On 11-12-12 7:20 PM, Corwyn wrote:
<blockquote cite="mid:4EE69A59.6030605@midcoast.com" type="cite">On
12/12/2011 3:39 PM, Sacie Lambertson wrote:
<br>
<br>
<blockquote type="cite">We have tongue and groove ceilings,
<br>
</blockquote>
<br>
EVERY example I have tested of tongue and groove (especially
v-match) ceilings or walls has leaked significant amounts of air.
Were I to make a recommendation for someone wanting that, it would
be to build the surface with drywall, and put the wood over it
once it has been found to be air tight.
<br>
<br>
Thank You Kindly,
<br>
<br>
Corwyn
<br>
<br>
<br>
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