2-part flotation foam. its available as 2#/cubic foot for pure flotation, up to 16# per cubic foot (used to add anti-crush and buoyancy to submarines)Scott, thank you for the reply, can you please give me an example of 6# foam? I was thinking about the big sheets of that pink foam board insulation from Home Depot.
yes, I would use 6# with typical stringers, 8# without any support in a typical boat.Scott would a foam poured enough support?