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Old 01-17-2018, 08:47 AM   #1
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Insulation for narrow gap wall?


Howdy folks!
I live in a tiny house that was tacked together during the Great Depression.
The exterior walls feature an uninsulated gap that's about 2˝ inches.
Foam insulation contractors insist that foam won't spread properly in such a narrow gap.
Is anyone aware of a free-flowing loose fill insulation that won't eventually settle much or at all—that could be poured into a large hole drill up high?

Thanks!
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Old 01-17-2018, 08:54 AM   #2
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Re: Insulation for narrow gap wall?


Hi Master,
What is on the inside and outside. If concrete or brick there are moisture concerns. And approximately where are you, heating or cooling climate, or both .

Bud
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Old 01-17-2018, 10:57 AM   #3
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Re: Insulation for narrow gap wall?


Elmira Heights, NY

The outside is old Dutch lap siding covered with Masonite siding. UGH!
The inside is either old drywall coated with a thin layer of plaster, or 3/4" furring strips, with thin fiberglass insulation between, over the drywall/plaster—covered with paneling. UGH, again!
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Old 01-17-2018, 12:50 PM   #4
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Re: Insulation for narrow gap wall?


Can I assume the 2.5" gap is available on all outside walls?
Electrical wiring should not be the old knob and tube with a 1930 vintage home so foam insulation should still be an option. But, have you talked to any contractors that install cellulose. A bit more work with the narrower gap (not the normal 3.5") but they should still be able to do it. The decision would have to be made as to blowing in from the inside or outside. This time of year I would vote for the inside. If that paneling could come off that area would be easy to cover, just put the paneling back up.

In terms of adding insulation to the smaller space it is always the first amount of insulation that yields the most savings. And blown-in cellulose will air seal. The contractors use a lot of it up here in Maine.

Make a few calls and get a quote or two and listen to what they are suggesting. If you can DIY, cellulose can be done.

Bud

As for pouring in an insulation they still make "perlite or vermiculite insulation" but I would expect some settling over time and its r-value is a bit lower.
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Last edited by Bud9051; 01-17-2018 at 12:55 PM.
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