Is it worth it to replace my exterior wall insulation?
Long time lurker, first time poster here.
We have a brick house that was built in 1963, and I'm gearing up for a renovation project that will combine two bedrooms and an existing bathroom into a master suite. Since I will be building new walls, and finishing drywall, I'm toying with the idea of replacing the exterior wall insulation.
It appears to me that the existing insulation is approximately 3" mineral wool batt insulation. It is black fibers that are 1/2"-3/4" in length, and the paper backing is black as well.
My question is whether or not it is worth it to replace the existing insulation with R-13 or R-15 fiberglass batts. Would the energy savings be worthwhile enough to warrant the extra work?