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Message: <blockquote data-quote="Canadian Dave" data-source="post: 418663" data-attributes="member: 21172">Greetings onthewater102,Excellent topic and one that anyone modifying a boat should carefully consider.  I had an issue with waterlogged pink foam sheets under the floor of my jet jon that equated to literally 100s of pounds of additional weight.  My solution, which has yet to be proven, was to add a layer of geogrid between the floor and the first layer of foam hoping that the grid would separate the foam from the floor, allow any water a path to follow to the back of the boat and perhaps encourage drying by adding an air space.  I appreciate DaleH's advice re: encapsulating the foam with a layer of plastic.  I wonder if a combination of geogrid and encapsulating the foam in a heavyish gauge plastic bag that could be sealed would be a viable option?  Red house wrap tape has proven to be a long lasting product, perhaps it could be used to seal a heavy gauge bag of foam?  hmmmm  #-o</blockquote>