Insulating walls in old houses
Making progress on my 1915 Harris Allen in North Berkeley; I've got the new foundation going, new electric is almost in place and am insulating the attic to R38. I've gotten wildly different quotes on "drill and fill" insulation for the exterior walls. $1900 for 2200 sq ft from a couple of guys and $5900 from a high tech firm that would use an IR camera to find and fill all potential voids.
Seems like a big spread...maybe I could buy an IR camera for less than $4000! Anyway what has been your experience and any advice?