This guide provides general information. An on-property inspection is the way to assess actual condition and the appropriate scope.
Shingle edges are curling, cupping or lifting
Raised edges catch wind and can indicate age, heat stress or fastening problems. Look across the roof plane in low-angle light rather than focusing on a single shingle.
Granules are collecting near downspouts
Some loose granules are normal on a new roof. Heavy or continuing loss on an older roof exposes asphalt to ultraviolet light and often signals broader wear.
The attic shows moisture, stains or daylight
Dark decking, damp insulation, rusted fasteners or visible daylight deserve prompt attention. Not every mark means replacement, but the entry path should be traced.
The roofline sags or changes shape
A dip between rafters or along the ridge may point to deck or structural movement. Avoid walking the area and arrange an inspection.