I've got a 3 yr old 12x16 shed on a gravel pad. I put down driveway cloth, then 4" #2 stone- tamped and drove a machine over it for a bit-- then added 4" of crusher run and repeated. My plan was to rent a power tamper for a day -but the shed got here and it seemed 'good enough'.
Now the 4x4 skids have settled into the gravel a 1-3 inches.[I'm 71 & still learning]
So- I'm jacking it up and my initial thought was to slide treated 2x6s across every couple of feet.
The more I think about it I wonder if I might be better off making 24x24x3" PT pads and running them every 6' around the perimeter. [and probably making a trap door in the center of the shed for another]
There are 5 4x4 PT runners- and the joists resting on them are 2x6's on 16" centers.
Seems like this method would make future leveling much easier, and I think the 2x2 pads are less likely to work their way down into the gravel than a 2x6 would.
I've got lots of time and a few barn jacks and a couple hydraulics so it is going up slow, but sure.
Does someone have a comment-- or a better idea?