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I have used 1-inch-thick flagstones under plastic sheds before; I find the flagstones secondhand at a good price on some neighborhood trading website, I can transport and place them myself with moderate labor, and they fit tightly together and give a pretty good feel under the shed's built-in plastic floor. I rake the ground bare and adjust the dirt for ...


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I did something similar awhile a back but I used concrete piers instead. Since I live in an area where the ground never freezes I didn't have to think about frost lines so I didn't have to very deep. This was kind of a go between the costs. The slab is nice as you'll have your floor already. With a pier system you have to build the floor as well.


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One alternative to concrete would be soil cement. The basic principle is that you mix 5-10% of portland cement with the soil, add water then compact it. This reduces both cost and environmental impact. Depending on the use case and type of soil, you could probably get away with just compacting the soil. To get around the moisture problem you could use ...


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