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Wood may also be a good choice. Species we use outdoors are Cedar, Cypress, Sapele, Ipe, White Oak, and treated pine. Those are all rot resistant but all wood weathers outdoors, like cracking, splitting, warping, etc. Wood finishes help but need to be reapplied regularly. Coating in epoxy is a great way to protect the wood long term but you have to protect raw epoxy from UV as well. You can use a UV stable epoxy hardener like West 207 or add a filler like aluminum powder to block the UV from degrading the epoxy.
You may also look into an architectural composite material like Richlite but I don't have any first hand experience with it. |