Your roof covers the largest asset you own, so it pays to know the signs of trouble. Fortunately, many of the danger signals are easy to see-you can sometimes even spot them from the ground. (Tip: Binoculars help!) A small leak can go undetected for years, causing huge damage before you notice anything. It's a good idea to inspect your roof regularly. Many contractors offer free inspections. But even if you have to pay, it's better than finding leaks after the damage is done. Here are a few of the most common and easy to recognize signs of roof problems.