Our basement is pretty humid and has moisture coming up through the concrete floors. The basement has a history of mold and flooding. From listening to The Money Pit, I know proper grading and gutter maintenance outside the home should prevent this. We had a basement expert come by and he said grading was not enough – a total overhaul was necessary and he wanted to install drain systems, a new sump pump, etc to address the moisture (our ultimate goal is to finish the basement). Is he right or is he just trying to sell his services?