Shim for Shed Base

Sorry.... I meant to say 8 x 12..... and the gaps go up to 1- 1/2 " (not

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Construction grade redwood. If you pick up a 1x12x8 plank, you'll probably be able to build all the shim stacks you need. Make each stack at least 6x3 and tweak the height by stacking pieces or sanding the top down slightly. Run the built-up ones together with galvanized nails and/or construction adhesive (Liquid Nails etc.), lift the frame slightly to tap them into place if necessary, and toenail through the frame to hold them in place.

One open question: Is the frame straight ?

TO answer your question, I'd use concrete products - concrete and or bricks, blocks, etc - and build yourself a level set of "footings" on top of the slab. Space them appropriately for your minimal framing timbers.

This will both level the frame area and get you some ventilation under the shed floor.

Bob