Don’t know how I missed this the first time. I did see this type of leveling in action, albeit for sidewalks. I think they did sections of the parking lot as well but I didn’t personally see that being done.
Spent some time talking with the installers. They seemed pretty confident in their ability to control the amount of lift provided as well as the amount of weight they can move. What else are they going to say?
I watched them do a few sections and the lift was very controllable. The guy set up simplistic device to show how much he needed to lift. A hole was drilled where they needed to lift, then he stuck the nozzle in. He would pull the trigger a bit at a time until it started to move. Only a couple of times did he miss the mark and have to add a bit more. I didn’t see him ever lift too much, so my guess is he has a good feel for just how much to shoot.
In the end it seemed to expand and move the sections into virtually perfect alignment. Under a microscope my guess is they are pretty far off, but then perfection wasn’t really needed. Based on what I saw and remember, I would say they got somewhere between 1/32" - 1/16" on fairly consistent basis.