I don't know what is the best kind of foam to use, bot would it be styrofoam? Could I secure styrofoam to my floor with Liquid Nails, and then secure 1/4" plywood to the styrofoam with Liquid Nails?
The styrofoam would bridge the channels that run lengthwise on the boat so wouldn't keep water from draining to the back. Since the plywood would rest directly on the styrofoam it wouldn't need to be very thick. It would essentially protect the styrofoam.
What would be the downside to this approach? One downside I can think of is how difficult it might be to remove and replace the plywood someday, although I don't know how securely the Liquid Nails would hold it all together.
The styrofoam would bridge the channels that run lengthwise on the boat so wouldn't keep water from draining to the back. Since the plywood would rest directly on the styrofoam it wouldn't need to be very thick. It would essentially protect the styrofoam.
What would be the downside to this approach? One downside I can think of is how difficult it might be to remove and replace the plywood someday, although I don't know how securely the Liquid Nails would hold it all together.