Insulation for interior walls
We are in the process of building a “pretty good house” in Manitoba Canada. D.P. Cellulose insulated 12” thick walls, triple pane windows, no gas appliances. Also working hard to limit noise transfer between bedrooms. We have decoupled walls with staggered studs, and framed them either 4”
Or 4.5” wide (bottom plates) with 2×4 studs.
These wall thicknesses seemed great at the time but now I’m not sure how to insulate them. Do we use 3.5” roxul bats and leave 1/2” void or do we use 5.5” Fiberglass and compress it? I’m wondering if the Fiberglass will negatively affect the indoor air quality? Does anybody have insight on this?
From reading on green glue website they say Fiberglass will work equally as well as roxul but that air spaces can work against you.