U.S. Census Bureau — American Community Survey
Signs of an Aging Roof in Columbus, OH
51% of homes in Columbus were built before 1980 — about middle-of-the-pack (#8 of 20 we track) for share of pre-1980 housing. A home that old has almost certainly had at least one full roof replacement already, and a lot of Columbus housing stock is due for (or overdue for) its next one — which is exactly why these visible wear signs matter more here than in a newer-built city.
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Median year built
51%
Built before 1980
37%
Built before 1960
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates, 2022.
What to actually look for
These signs apply to any asphalt shingle roof regardless of the home's age — but they show up more often, and matter more, on housing stock that's already past one replacement cycle.
Granule loss in gutters or downspouts
Asphalt shingles shed their protective granules as they age. Finding a gritty, sand-like buildup in gutters or at downspout outlets is one of the earliest visible signs the shingle's UV protection layer is wearing through.
Curling or cupping shingle edges
Shingles that curl upward at the edges or cup in the middle have lost the flexibility they need to lie flat — usually a sign they're near or past their expected service life, especially after repeated heat and freeze-thaw cycling.
Missing, cracked, or visibly bald shingles
Any shingle that's cracked, torn, or missing entirely is an active leak point, not just a cosmetic issue — water finds its way in through gaps that small.
Dark streaks or moss/algae growth
Dark streaking is usually algae, and moss patches hold moisture against the shingle surface longer than normal drying allows — both accelerate material breakdown over time, particularly on north-facing slopes that get less direct sun.
Sagging roof deck or visible dips
A roofline that looks uneven or dips between rafters usually means the decking underneath has absorbed water damage — this is a structural sign, not just a surface one, and generally warrants a prompt inspection rather than a wait-and-see approach.
Daylight visible through the attic roof boards
If you can see daylight through the roof boards from inside the attic, or find water stains on attic insulation or rafters, water is already getting through somewhere — even if there's no visible drip yet.
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