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I have 1930 colonial, got quotes from several people, one quoted attic and walls to have celluose blown in, the other said just do the attic.
What should we do???
you will lose the most heat through the attic but youll lose it through the walls as well. if the walls have insulation in them already thats in good condition you only need the attic done.. the best way to find out whats in the walls without opening them up is to get a insulating contractor who has thermo imaging gear that can scan the walls to find out
Thanks. Walls are empty....so?
go with the blown in cellulose
Or you could go with injected foam insulation.
You could run into major moisture problems. Cellulose absorbs moisture and im guessing you probably dont have a vapor barrier. The result can be rotten studs and sheathing. Better to use foam or insulate from the outside if possible. Otherwise, air gaps...ie no insulati8ns... have a fair r value if you stop air leaks. I have no wall insulation, but my stucco exterior is fairly tight. My energy bills are similar to new construction the same size. Actually my ac bill is lower because I have deep soffits that shade the house.
+1 on spray foam overall. It seals air leaks and insulates better. Stop the air movement and you eliminate moisture problems. Although and insulation retrofit has risks.
Id also look at a 2in layer of spray foam on the attic floor to seal it with rolled fiberglass over it. Cellulose is really nasty stuff and again, is hydroscopic and can cause moisture problems.