I have made panels just a couple of inches thick but they do have a tendency to bow. Garden mesh would be better than plywood, you want maximum drainage.
spaceman
I am looking to make 8' wall panels and was wondering what was the thinnest you could make them and not be breakable, no structural support just for walls. Also wanted to know what to put under the pour, just garden mesh or plywood bottom. Am building mixer with fiberglass tank will send pics when done. Thanks Michael south TX.
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