We bought a johnboat and thought the it was oddly heavy. This weekend we
discovered that the foam under the deck was saturated with water. The
oddest thing I have ever seen. After removal, the boat is easily handled by
two men. It took four before. So now it has no foam for buoyancy. I
obviously want to replace it. The old foam was covered with some sort of
plywood, which has disintegrated, and aluminum sheeting. I would like light
weight substitute to perform the stiffening function of the plywood.
Without it, the sheeting will be destroyed. Any suggestions?