Our hallway floorboards are not in the best of shape. On the lower floors, there are a couple of patches where you can feel the floorboards flex a little when you walk on them, adding a little bounce to your step. On the top floor, they are more stable, but the whole hallway creaks a lot, which is not insignificant because it’s the floor where the kids’ bedrooms are and, as any parent will tell you, once your child is asleep, you want him/her to stay that way. So we’re wondering what people would recommend for both situations? How big (or small) an ordeal is this potentially?