From inside your house, there shouldn't be leaks, brown spots, water damage and mold, sagging points within the ceiling, or visible light from outdoors. From an exterior view, search for "bald spots", places where shingles are missing, curling shingles, broken flashing around fireplaces, pipes, vents, along with other sticking out points, cracks, loose material, flapping shingles, bits of roof or shingle in the gutters or around the bottom of the house, external signs of sagging within the roof, and spots of moisture or mold. Do not wait for water to pour inside your house before you decide to call San Antonio roofing services! Look for small signs and indications and feel free to contact them to ask questions and recommendations.