If your roof isn’t too steeply pitched and has material that won’t be damaged by walking on it, AND you are mentally and physically fit to do so, carefully inspect it in good weather. Look for broken or missing shingles, missing or damaged flashing and seals around vent pipes and chimneys and damage to boards along the eaves. Shingle damage up-slope will often cause water damage far downhill. Check the chimney cap and screen and look down the flues for obstructions or animal nests. If you can’t or don’t want to get on the roof, you might want to use a ladder around the perimeter. Pay close attention to valleys and flashings; these are the primary leak-generators. Some simple, easy fixes now can prevent thousands of dollars of water damage later.