We live in a 1960s built home partially renovated with the original section having 4" walls and a fiberglass pink insulation.
I knew we had cold walls and they were leaking heat continuously, but did not know how best to approach upgrading them. After a significant amount of research on the internet comparing different methods and different companies doing this kind of work, and approaching multiple companies, I decided to hire Beyond Foam Insulation to complete the work. Beyond Foam assisted me in hiring someone they recommended and trusted to remove the existing vinyl siding, remove the building paper and sheeting, have the sheeting and vinyl siding labeled and stacked so that it could be re-attached to our home exactly as it was before.
Beyond Foam came in immediately after the siding was removed to spray in the foam. It seems to me they utilized and filled in every possible crevice and space and maximized the volume and thickness (and r value) prior to the crew replacing the sheeting, applying new building paper and replacing the vinyl siding just as it was before. Our yard was cleaned up, scanned for nails with a magnetic device, and within the span of a few days from start to finish, it looked like nothing had been done...but we immediately could tell the difference in warmth of our house from the inside.
I'm glad we upgraded the insulation the way we did rather than approaching the work from the inside taking off the drywall or perhaps inserting foam through holes. I was a little scared about the siding, but it doesn't look like it was ever removed. Also, I think they were able to have more thorough access to applying the foam from the outside reaching right into and above the soffit.
I'm very satisfed with the end result and would recommend this method of upgrading insulation to older exterior walls and I would recommend having Beyond Foam complete the work.