Perform visual inspection of ceilings and walls for evidence of water incursion

Finding a roof leak can be difficult because often the actual spot where the roof leaks is not always exactly where the water stains are appearing on your ceiling. Water can enter the roof at one point, and then run down to another before it starts to soak into the ceiling. It’s sometimes easy to spot obvious roof damage (shingles are missing or damaged, stains on ceilings or walls), but by then, you probably already have some significant water damage. Your best bet is to find the roof damage before the leaks appear.