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Russell DuPree
Compressing f/g insulation

If I use fiberglass batts that are thicker by a few inches than the wall space, will I lose insulation value?

Timothy Miller
Re: Compressing f/g insulation

Howdy yes compression of the fiberglass does reduce its R value. you might consider instead separating the extra from the batts then installing the sized batts.the ca it pulls apart easily.

A. Spruce
Re: Compressing f/g insulation

Yes.

It is not the insulation that does the work, it is the trapped air inside it.

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