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Building Forms There are a few main differences between cob forms and rammed earth forms. Cob slipforms do not need to be nearly as strongly engineered and robust as rammed earth forms do. There is much less pressure put into cob forms, compared to with rammed earth. The other major difference is that cob forms have an open-air metal mesh siding, instead of plywood siding for rammed earth forms. Cob forms can be built very practically, simply using a 2x4 wood framing, and nailing thick gauge met