Typically, roof problems are discovered after leaking or other serious damage occurs. Periodic (once a year) inspections often can uncover cracked, warped, or missing shingles and tiles, loose seams, deteriorated flashings, excessive surface granules accumulating in the gutters or on the ground, and other visible signs of roof problems. Also, most any tile or shingle roof 10 years of age or older will require some maintenance. Flat roofs should have maintenance around 5 years of service. Indoors, you should look for cracked or peeling paint, water stained ceilings, or peeling wallpaper as signs of possible water entry. Outdoors, look for stains under the overhangs, especially at valleys..