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1/2 is too thin for stand alone. If you use it put plywood under it. Use 3 inch and you can glue it right to the frame. Liquid nails works good as does any water based cement/glue. Avoid organic solvents, ie acetone, esters, gasoline. In a yard you would put the track right on the foam, or make roadbed and ditches with a knife. You start at the top and dig down instead of the bottom and build up. Do it backwards from the old way. If you go too deep plaster or spackling sticks good. You can use acetone to dig with, but I don't really recommend it. BTW I live in Aurora... 35 miles west of Springfield.
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