Makes sense Jim. Thanks. And many people use gravel pass under sheds w.o issues. Works well as drainage plus my soil drains well to begin with. The shed comes on 4x4s that are PT along with the joists and flooring.
It is a prefab from good old Amsih country.
My shed was built in Lancaster PA by the Amish at a place called Pequea. I went to their place to sit down with them and hash out all the details I wanted in the shed. They were very accommodating and in the end I got exactly what I wanted.
In order for the shed not to be labeled "Permanent", and thus cost a hell of a lot more in fees and raising my property taxes, I had to build the foundation for the shed out of pressure treated 6x6's for the outer frame and 3/4 inch crushed stone for the fill on the inside. According to the town zoning laws, it had to be made from this or they would not pass it when it was done in order to keep it as "Non-permanent".
Also, due to zoning laws in the area where I live, which is zoned Protected Conservation land, I could only make the pad for my shed the same size as the square footage of the shed due to restrictions on "Impervious surfaces" versus the total square footage of my yard. My shed is 10x16, so the pad could only be 10x16. If I wanted it any bigger I would have had to remove some of the existing "Impervious surfaces" on my property such as part of my driveway or my deck. And that was NOT going to happen.
Anyway, because my pad is filled with the rock, it drains very nicely, so I think you will be fine with what you are doing.
Here is a picture of my pad when I was done compacting the stone and a picture of the shed I just took today. You can see that the shed sits just about right at the edges of the 6x6's. My shed also has 5 pressure treated 4x4 runners, pressure treated 2x4's on 16 inch centers for the floor joists, and a pressure treated 5/8 inch plywood floor for reference.
My next shed project is to put gutters on it to keep the water from splashing up onto the siding and possibly rotting it out.
