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Message: <blockquote data-quote="Azdesert" data-source="post: 510862" data-attributes="member: 34734">Pouring the foam on top of the sub floor and under the main floor keeps it from being in direct contact with the hull. That stuff gets water logged over the years and can end up causing some corrosion. Doing it that way helps it from getting water logged. The pour foam can add lots of weight to the boat over time. North Country Jet Boats stopped using it about 5 years ago because of these problems. If the design of the boat has a subfloor, IMO it is the best way to add pour foam,  a floor slightly above the hull doesn't give you this option.I really wanted to add pour foam on my current project because it does help with stiffing the hull, as well as floatation.  But because I am only putting a floor in I elected to pass on using pour foam because I don't any of the known problems in the out years.</blockquote>