Your home’s roof is a large surface area that collects rain water and drops it where you least want it, on your landscaping and along your basement walls. In some homes, this can lead to a wet basement, possibly causing mold and mildew. It can also lead to premature erosion or pitting of driveways, and sometimes damage wooden thresholds, patio doors and decks. Even if you don’t experience these problems, you may want gutters simply to keep water from pouring on you when you walk in or out of you front door.