I live in Central Ohio and we have an old Florida room that I want to convert into a bedroom for my son. The floor is a concrete slab about 3 ft. off of the ground. The whole room is enclosed. My problem is any time it rains we get water leaks between the concrete slab and the wall. The horizontal board that sits on top of the slab is soft and rotting in places. What type of contractor should I call to come out and take a look at it? Also, can the board at the base of the wall and the top of the slab be replaced without tearing the whole wall out? Thanks for your help.