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Message: <blockquote data-quote="onthewater102" data-source="post: 457798" data-attributes="member: 13702">Not really. A cubic foot of water weighs a smidge over 62lbs. At only 2lbs/cuft foam is one of the lightest options out there - you're not going to gain anything meaningful with a different material.Check out my thread on my tracker III linked in my signature - I just poured foam in between my floor ribs last night, each cavity is 4' wide, ~14" wide and 1.5" deep. I added roughly 3 cu.ft. of flotation just by filling these cavities beneath my floor. On a 15' boat you probably have a similar space to work in - you might be surprised how much wasted space there is that you can put to use for safety in the event of an emergency.</blockquote>