---

The coosa FAQ Dennis posted speaks to this specific situation - read the answer to the question "What factors should I consider in choosing and installing Coosa panels?"

In short, they recommend using the same methods that were used to construct the original panel. So if the original was laminated both sides, I would do that. Stiffness is important and core thickness has a major impact on the stiffness of a laminated panel, so I would possibly go thicker than the original, if it will fit. You can choose a panel that weighs the same as the original plywood, but since the Coosa is less dense, it will be thicker. The back is not exposed to UV, so I would be inclined to laminate the back with epoxy resin and woven fibreglass or even carbon fibre if you really want to go nuts.