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Message: <blockquote data-quote="FuzzyGrub" data-source="post: 496354" data-attributes="member: 3438">I'm guessing that your hull thickness is around 0.100" and ribs on 16" centers.  My guess is that you can feel that flex when you stand on it.  For no flex, 1/8" or more, but will add weight. I went with foam boards between ribs to fully support the floor, which is only a mear 0.040" in my build.  The thin aluminum was easier for me to work with, given my lack of tools to work with heavier.  The existing floor is the support system, and the top alum is to protect the foam and hold it in place if capsized.   Some pictures: <a href="https://www.tinboats.net/threads/johns-river-jon.24099/page-3" target="_blank">HERE</a>No matter what thickness you choose, I'd use the foam boards for the additional support.</blockquote>