Installing metal building over unlevel concrete pad
I'd also think a little bit about doing wedge anchors, leveling plates and jamb nuts along with the grout, especially if the rails are really light gauge. That's how I'd do it. It's not something that we come across with the sheet metal building kits, but with equipment, tanks, pumps, steel columns, etc, leveling plates, jamb nuts, and NS grout are the way to go.
Also certain grouts can be extended out to 2.5 - 3 inches using pea gravel. The whole reason you want to limit the grout thickness is the heat that gets generated during the cure. Extending it with pea gravel helps because the pea gravel acts as a heat sink during curing. But you have to buy the right grout to go that thick.
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