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BellyScratchFTW t1_is5l3fn wrote

You're wanting to put down ground contact rated pressure treated lumber for the ground contact pressure treated runners to sit on? Seems unnecessarily redundant. Especially if it's going to sit on gravel.

If you're in an area with a lot of rainfall and/or freeze/thaw cycles and want the shed to last a LONG time and never settle from where it started, I'd recommend taking the top soil up and then laying down the 4 inches of #57 (1/2" to 3/4"). Level it and compact it. Then you can either put the shed (with runners) directly on top of that or build it up more with concrete blocks if you like. Taking the top soil up is important because it's easily compressible. If you left it there's a good chance that your shed will sink a little, given enough time. But with those runners being pressure treated, they should be able to stay dry enough sitting on top of gravel.

What I'd be most worried about in my area is termites under there. They'll easily mud tunnel up to the shed from the ground. So if you're in a termite area, and most of the US is, I'd recommend treating (or having treated) the ground/gravel right before they put the shed down. Here's a map of the US termite zones if that helps.
https://www.termitestreatment.com/distribution-of-termites-in-usa/

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EnuqieuEsur OP t1_is5ljah wrote

The pressure treated lumber was to build a perimeter to contain the crushed 3/4 stone.

I’m in MA so though there are no major termite concerns it is still something worth treating ahead before the shed is dropped.

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BellyScratchFTW t1_is5nz9d wrote

Oh, glad to hear about the termites not being a big problem. I think the rest is just up to you. If you dig down the top soil (at least the grass layer at minimum), you'll likely have your 4 inches of perimeter right there.

If you chose to not take out the top soil, you have the option of extending your gravel "pad" by a foot or so all around. This will naturally taper off to grass and likely wouldn't be an issue later. But if you wanted a cleaner look, I'm confident that your idea of using pressure treated lumber or blocks would work well.

Your gravel will likely not put much pressure against the lumber or blocks and push them out.

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