Roofs rarely fail all at once. These are the signals that usually arrive first.
From the ground
Look for curling or cupped shingle edges, bald patches where granules have washed away, dark streaking, and any sagging line along the ridge. Granules collecting at the bottom of downspouts is a reliable sign of age.
From the attic
On a bright day, daylight through the decking means gaps. Water stains, damp insulation or a musty smell point to leaks that may be traveling before they show on a ceiling.
Age
Three-tab asphalt commonly lasts 15 to 20 years, architectural shingles 20 to 30, depending on climate and ventilation. If your roof is near the end of that range and repairs are becoming frequent, replacement is usually the cheaper path.
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