Originally Posted by Patricia D.
But as a concept, would it work to stiffen/strengthen the floor?
If it is bonded well to the plywood then yeas it would stiffrn the floor.I covered the new 3/4 inch exterior plywood floor when I replaced the floor in my 16' Scamp
I covered the ply with 6. oz. fiberglass cloth and bonded it with Epoxy resin.
I did top and bottom ans especially the sides. I rounded the edges so that the fiberglass would follow the contour since it really doesn't like to go around sharp corners.
The top of the covering will be in compression ao if it is not thicker and well bonded it won't help much.
The bottom will be in tension and the wood in the middle just keeps the space from changing, adding stiffness.
Also the floors tend to rot out from water on the top and not on the bottom so much.
I covered the ply before I installed it and then bonded it to the shell along the sides with strip of cloth and epoxy.
I was also careful to epoxy and cover all penetrations through the floor because the problems start when the center plies of the wood get moisture in them.
I have has leaks
while building and resealing the windows
and was just faced with puddles on the top of the fiberglass floor which wipe up easily.
No penetration into the wood.
and others that sandwich wood between fiberglass shells are a different thing altogether since the fiberglass is NOT bonded to the wood leaving space for the water to sit and soak into the wood and rot.
My floors are monolithic in that the fiberglass is bonded with epoxy all around with no space for the water to get in and sit.
So far I have not seen any floors rot from the bottom, but many places in mine where there were unprotected penetrations and leaks
tha kept the floor wet from the top.
If I were you I would lay fabric on the top and bond to the shell and cover the floor and I would spend the extra money on epoxy since it will resist moisture better than the polyester, but others disagree.
factory sprays polyester resin on the floor and it does not do the job.