We were told that we need an internal french drain, is this the only way that our problem can be solved, as the gameroom is a finished room and we were told the walls have to be removed and replaced. Does this sound correct???: My home is 3.5 years old and we have found that our basement floods when it rains hard and if it only rains lightly, the basement is always musty and mildewy and mold grows everywhere. We now find that there are step cracks in the basement wall. Can anyone tell me how this should be fixed.