This customer in Wilbraham, MA called us when he realized he needed new insulation in his basement. After a very detailed evaluation with our Home Comfort Specialist, they decided that using spray foam in the rim joist would be the best option.
This homeowner already had fiberglass batts in the rim joist. Fiberglass is a notoriously bad insulation. It's prone to falling down or sagging, letting air leak in, and being comfortable as bedding for pests such as rodents.
We immediately removed the fiberglass insulation from the rim joist. We then went back in with two part expanding spray foam, installed on the rim joist and the sill plate. This goes into every crack, gap, and joint to make sure that there are no air leaks.
