I WAS talking about "properly fitted fiberglass". I got a quote of
$1,050 to put recycled denim insulation in the attic rafters. When I
asked him to quote me for the same job using fiberglass, he said it was
so much less efficient that they (their company) didn't use it. . .
So you're saying that Denim *is* more efficient, but "not much more"?
So would you recommend getting a quote from another company--one that
does use fiberglass?
I don't know anything about denim as an insulating material--never seen
it used so have no data. I'd think it would be possible to Google for
detailed specs on it and any other materials and get real data, not just
I would also get at <least> one other quote just on general
It might be that denim is slightly more efficient than fiberglass.
Cellulose is. But both denim and loose blown cellulose have more
drastic drawbacks (packdown or soakdown or both).
If you're that concerned, look for someone who can do Rockwool and
get a quote.
Rockwool is only a trifle more expensive than fiberglass, is a bit
more efficient than fiberglass, and is better than fiberglass
in most of the other issues with fiberglass.
Better sound control too.
See www.roxul.com for one brand.
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.
Denim batts, or blown-in denim?
Denim batts and fiberglass batts have about equal R-values. Cotton
blown-in and cellulose blown-in have about equal R-values.
The real work in insulating an attic is putting in the styrofoam,
cardboard, or plastic eave vent chutes. If you have no soffit
vents (or no soffits), the installer may still have to block off
the point where the rafters intersect the top plate to keep blown-
in insulation from escaping there. Usually they'll stuff under the
chutes or at that point with fiberglass batting. It's not a
pleasant job. You lay on your back or stomach on a board in a very
Once that work is done, laying batts or blowing in the insulation
is a piece of cake.
I'm presuming that you already have insulation in the attic. Have
you considered just rolling out unfaced fiberglass batts on top of
To reply by e-mail, remove the obvious word from the e-mail address
Some of what you're mulling over involves which material to use, while other
questions involve marginal differences. However, adding a second "method" in
addition to internal insulation can make the benefits add up to more than
the sum of its parts. Not really in terms of insulation factors, since that
would defy the laws of physics, but in terms of comfort and peace of mind.
So....have you considered new siding, and adding Tyvek underneath it? That's
the silver stuff you see houses covered with before the siding goes on. Do
that, along with whatever insulation you choose, and you're gonna have one
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