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Question DetailsAsked on 9/7/2011

I am trying to decide about insulation in my attic...There are different materials to blow in. Which is more expensive, "green," effective

I have walk in attic, older home (1930s) with no insulation.

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1 Answer


Are you wanting to blow insulation into the attic area? ie: on the walk-in floor? This would provide GREAT insulation value, but make your attic useless for storage.

Are you positive there is NO insulation under the floor/between joists?

As far as blown in insulation, you can use fiberglass, foam, cellulose, or cotton.

Fiberglass has the primary advantage of NOT settling. It also will not take on mositure. Fiberglass is naturally not flamable.

Foam is a hot product right now. It is expensive, but has some great features. It can not get wet. It fills most cavities completely. It has fantastic R-values (ability to insulate) per inch. You could use 3" of foam instead of 12" of fiberglass. Sometimes this is the only product that can deliver the required R-value in the given space.

Cotton is the new "green". It is also the most expensive. It must be treated to make it not flamable.

Cellulose is the old green. Cellulose is ground-up newspapers. It is my favorite. You will need to use about 20% more thickness than fiberglass (to accommodate setteling) but the price makes this very doable. Cellulose MUST be kept dry. Cellulose is treated to make it not flamable. My favorite is borax treated. This makes it also good as an in-cavity bug killer.

Whatever you decide, the more be better. You can never go wrong with extra insulation.

Answered 9 years ago by Belles Architecture

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