The neighbors play house is the same way, built 5 years ago...and it hasn't moved a mm. a Fixed structure on the property is taxable, right now the building permit I pulled for this classified it as a tool shed. tossing a bottle jack on the frame to shim it up for thermal expansion and land erosion/settling is perfect to extend the life and the frame will not warp and shift. If I was building it to be a livable structure, then I would go all the way out and make the sono tubes go down below the frost line, which in the cities code is at 41"...
City of Meriden building code.
Frost Protection. Except where otherwise protected from frost, foundation walls, piers, and other permanent supports of buildings and structures shall be protected from frost by one or more of the following methods.
blah blah blah.
Exceptions:
1. Freestanding accessory structures with an area of 400 square feet(37m^2) or less and an eave height of 10 feet(3048 mm) or less shall not be required to be protected.
2. Decks not supported by a dwelling need not be provided with footing that extend below the frost line.
and seeing that we're not in Hurricane Alley, Tornado Alley, or Earthquake prone area. No real need to go over board for a tool shed. I"m kinda going overboard already on the base...it's prolly strong enough to park a car on.
and for the ramp...
Five Star Ramp 1000-Lb. Capacity, Arched | Arched Ramps | Northern Tool + Equipment