Hi, i have had a small leak from a shower inlet pipe that goes over my bath , their is a good two foot section that as rotted and damaged the floor board (very damp and soft)the problem is i cannot get to most of the board due to pipes running over the top . I know the solution is to replace the damaged section but due to position and amount of work i cant at the moment , what i would like to know is their anything i can use to fill and build the board back up and make it as level as possible. Can any one please help