That's great info thanks! We're outside of Chicago. Did you take down the interior walls before you installed the airkrete?
No. That is one of the big advantages of air krete in renovations, leaving walls in place. My installer removed wood clapboard siding (2 pieces at the top of each wall, some additional to get under windows and above doors), drilled holes in the sheathing about 2.5" diameter, filled with air-krete, installed a polystyrene plug in the hole, then re-installed the siding. I asked for a quote where I removed and replaced the siding and it was only a couple of hundred dollars less, so I let them do it. We had so much else to do with other projects that I needed that time. I used an Angie's List coupon to get $250 off the total price anyways. The installer wanted warm, dry days for air-krete install. It goes in wet like shaving creme and sets up hard once it dries, but it dries in the cavity. To give you an idea of how well this stuff gets into small gaps, it got into the electrical boxes through the gaps between the wires and the box openings. One wall had old wiring with no ground and they had to turn off a breaker because the installer (outside the home) kept getting shocked. Apparently it is a good electrical conductor when wet, and an insulator when dry.
Another benefit of air-krete is apparently mice don't like it. I found some fiberglass bat insulation in one wall prior to insulating. We thought there was no insulation but apparently the bathroom had some insulation added during a remodel once upon a time. The stuff was serving no purpose other than rearing large families of mice.
We DID have to tear out the knee walls and ceiling upstairs for them to apply the PSF to the roof decking, though. That stuff will blow your ceiling or roof apart during expansion. It is really a great product for air-sealing, though, and the closed cell has the highest R-value per inch available, which is why we needed it. Our sloping ceilings had 4.5" to stuff insulation, and we got R20 or R25 in there. They recommend R-60 for attics. That demo was a gigantic mess. There was some old cellulose in the sloping ceiling area, so it was like walking around in a giant mouse nest upstairs. We cleaned it up with snow shovels. I spent $20 on dust masks that week, best $20 I ever spent on home improvement.