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Message: <blockquote data-quote="Ray Clark" data-source="post: 519046" data-attributes="member: 31103">A 2" thick 4' X 8' piece of Expanded Polystyrene foam board will provide about 310 pounds of flotation.  That's the pink Owens Corning stuff you see in the home improvement store.Here's the calculation on that:Volume of the 2" X 48" X96" board:  9,216 cubic inches.Convert the volume to gallons (9,216 / 231):  39.89 gallonsWeight of water is about 8 pounds per gallon.  39.89 gallons of water weighs about 319.1 poundsThe sheet of foam board weighs about 9 pounds.319 pounds - 9 pounds = 310 poundsIf you use that foam, make sure you get the stuff that will not absorb water.</blockquote>