I'm also looit into OkayGrid, Hoofgrid, Stabiligrid sorts of products. Seem to run $3..$6 per square foot, 20+ year life. For 100' x 12' = 1200 sq ft, $3600..$7200 plus grading and gravel though. OkayGrid Bodenmat. A tough mat system that is fully load bearing, in sheets of 1200 x 800mm and a thickness of 22mm.
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