Hi there, I have a new construction townhouse. Part of the top floor is an outdoor fiberglass deck. Whenever we get torrential rains the water seems to be seeping through the stuccoed walls and running beneath the fiberglass floor to leak into the room directly underneath the deck. My question is - how high up the walls does the fiberglass typically go? Am I correct that it only goes up a few inches from the floor or should it cover the whole wall? Trying to find out whether this is due to faulty construction. Secondly, what should I do about these leaky exterior walls around the deck? Might a coat of polyurethane sealer over the walls help? Many thanks.