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Question DetailsAsked on 1/28/2015

Whats the best blown in insulation material?

House built in 1866

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You can find a lot of prior questions with a LOT of comments and responses on insulation issues in the Home > Insulation link in Browse Projects, at lower left.

For my money - except for horizontal insulation in floor joists, NO blown-in insulation - it just settles too much, leaving substantial gaps at the top of the wall after a few years. If interior surface is not being opened up (like a complete remodel) to allow use of fiberglass batt, I would recommend foam-in-place closed cell insulation, even though it costs double or more. Especially if this is original interior, as you probably have little or more likely zero interior surface vapor barrier, so you don't want a moisture-absorbing material like cellulose or cotton in your wall.

I guess if you are fixed on blown-in, I would use fiberglass insulation because it does not readily support mold growth. And make sure they inject at two levels (just below top plate, and mid-wall), with 90 degree nozzle pointing downward to pack it in a bit so it is not so loose - that reduces the insulation value a bit, but can pack it is tight enough that it is not likely to settle dramatically and leave a foot or so gap at the top of the wall.

Here is a prior similar old-house insulation question that might also be of interest to you -

Answered 5 years ago by LCD

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