Question by Ron B: Can I add blown-in cellulose insulation on top of preexisting loose-fill fiberglass insulation?
I just moved into a house and need to add insulation to my unfinished attic. Presently, there is approximately four inches of loose-fill fiberglass insulation, but I would like to increase the R-value to 49. I’d rather use cellulose insulation versus fiberglass, because I heard mice and rats use fiberglass as nesting material, whereas cellulose contains chemicals (boric acid, for example) that repels such creatures.
Answer by imaramblins
While I’m not an insulation contractor, I did have the mouse problem in my old house. I actually saw them run up my outside brick facade, and between a gap in the facia board, and the brick. That’s how I found their entry point, and could deal with the problem.
If you currently don’t have a mouse problem, you shouldn’t have to worry. Just make sure all possible entry points (facia boards, soffits, gable vents, etc. are tight, caulked, etc.), and you should be good to go. No worry of nesting, if they’re not there to begin with. Make sure your pad is tight, but ventilated properly, and blow it in baby!
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