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Yes, you can replace wood boards with COOWIN composite though there are a few factors to take into consideration. First, you need to make sure your substructure is code-compliant, confirm that the COOWIN board you selected has the same thickness as the wooden board it is going to replace to ensure your deck remains smooth and flat. Although replacing old wood deck boards with COOWIN boards can be done, it can result in an undesirable patchwork appearance. A better option, if your substructure is code-compliant, would be to replace your entire deck with all COOWIN deck boards.