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Tom,<br>
When you say the spaces are irregular, is it safe to assume you mean
the spacing between the rafters. Trimming the batts narrower to fit
the non-standard cavities can be finicky work but is possible. The
sprayed foam is also likely to be an irregular surface, but the
batts will conform to some extent. Both complications would
discourage me from using batts, even though I mentioned that earlier
as an option. <br>
<br>
I agree that installing a good, sealed, air barrier (taped and
mudded drywall for example - just avoid plastic) before installing
the t&g ceiling is essential. The primary source of moisture is
from the inside air; water from a roof leak is always a long-term
possibility but interior humidity is a constant pressure.<br>
<br>
I'd think about blowing the space with "spider blown" fiberglass
after the air barrier is in place, then sealing the access openings.<br>
<br>
Bob Klahn<br>
<br>
On 5/10/2011 9:18 PM, <a class="moz-txt-link-abbreviated" href="mailto:tom@honeychrome.com">tom@honeychrome.com</a> wrote:
<blockquote
cite="mid:20110510181838.829494f83a1efe767477bcfea0b8f9b3.be29feb4b5.wbe@email02.secureserver.net"
type="cite"><span style="font-family: Verdana; color: rgb(0, 0,
0); font-size: 10pt;">
<div>Thanks Bob and Ron for the responses. Yeah, when I had the
foam installed I should have told them to fill the cavities
completely and paid the price, but they were 'the experts' and
told me it wasn't worth it. It didn't really make sense to me
at the time, but I didn't follow through. I don't plan on
selling this house, so resale and short-term investment
recovery isn't a priority. I haven't installed the ceiling
yet, so I can still add insulation before I put the paneling
up. The ceiling is t&g pine boards, so I could install
most of it up to the peak and blow in cellulose from the top,
or put in fiberglas bats, though the spaces are somewhat
irregular. Seems like the cel. might be the better option.
But there is also the moisture issue. Even pretty well
sealed, it is rather dry in the house in the winter
(wood-stove heated) and the roof isn't vented (which is why
blown-in closed cell was installed). Will filling in the
space left with fiberglas or cellulose create a situation
where moisture can collect?<br mce_bogus="1">
</div>
</span>
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