Granules in the gutters. Asphalt shingles are protected by a layer of mineral granules, and they shed them slowly over a normal lifespan. When you're scooping out what looks like coarse sand every time you clean the gutters, the shingles are giving up their UV protection and the mat underneath is next.
Shingles that look wavy or lifted from the ground. Walk to the street and look across the roof plane at a low angle. Shingles should lie flat and uniform. Curled edges, a wavy line along a course, or a shingle sitting slightly proud of its neighbors usually means heat damage, failed adhesive strips, or nails that have backed out.
Stains around a chimney, a skylight, or a vent pipe. Most leaks are not holes in the field of the roof. They happen where the roof is interrupted. Flashing pulls away from masonry, a vent boot cracks in the sun after eight or ten summers, and water follows the gap down. These are inexpensive to fix early and expensive once the sheathing is wet.
Daylight or dark staining in the attic. On a bright day, go up with the light off and look at the underside of the deck. Pinpricks of daylight at the ridge or around a penetration are obvious. Dark streaks or blackened plywood are just as telling, and so is insulation that's matted down in one spot instead of fluffy.
A sagging line in the roof plane. A dip or a ripple along a rafter line is a structural signal, not a cosmetic one, and it usually means the decking has been wet long enough to lose strength. That one is worth a phone call the same week.
A roof that's simply old. Most architectural shingle roofs in this climate give you somewhere around twenty to twenty-five years, less on a steep sun-facing plane with poor attic ventilation. If you know the roof is in that range and you're seeing one of the signs above, you're deciding between a repair that buys a couple of seasons and a replacement. We'll give you our honest read on which is the better use of your money, with photos of what we actually found up there.