ok thanks, anyone what the approximate cost might be for a transom repair? also you mentioned "stringers" not sure but my floor is full cover with fiberglass
Most fiberglass boats have a series of stringers that run forward from the transom under the floor - they provide rigidity for the hull and support for the floor. They are usually made of wood, encapsulated in fiberglass. The floor is also wood with fiberglass on top. Most boats also have the empty space between the hull/stringers/floor filled with foam for flotation.
The problem is that most boats are built with an expected "trouble free" life of 10 years, maybe a bit more. Just like your car, they are not built to last forever. That doesn't mean you can't make them last forever, but it requires maintenance and repair.
Boat factories are not very good at making sure that water can't get into the wood/foam eventually, and a lot of boat owners don't help the situation either.
Once water makes it's way into the wood via a crack, screw hole, etc., rot begins. Eventually, it takes over. The wood gets waterlogged (and heavy). The foam under the floor gets waterlogged (and even more heavy). It holds the water against the stringers and floor - and eventually the water makes its way through everything and it all just rots.
There are plenty of threads on these forums showing what is probably under your fiberglass. Take a look at both of my threads in my sig below (different boats than yours, and older, but the problem was the same).
