Most homeowners who think they need a new roof do not need a new roof. They need a repair, a maintenance pass, or a second opinion from a roofer who is not also the one quoting the replacement. The inverse is also true: a roof that looks fine from the driveway can be three years past its useful life. The way to tell is not by looking at the roof. It is by knowing which signs actually predict failure and which signs are cosmetic. Here is the list.
The honest version: most roofs do not need replacement
Roofing replacement is a forty- to eighty-thousand-dollar decision in most markets. The contractors who knock doors after a storm have a financial incentive to find replacement-grade damage on every roof they inspect. The maintenance pass that an honest local roofer offers (replace ten shingles, reseal three flashings, clear the valleys) is a six-hundred-dollar job. Both can be true on the same roof at the same time, and the contractor's recommendation will follow the business model.
That is why the second opinion matters. If a contractor tells you the roof is gone, get another inspection from a roofer with no connection to the first one before you sign anything. Real end-of-life roofs survive a second opinion. Storm-chaser exaggerations do not.
Seven visible signs from the ground
Stand across the street, look at the roof in good light, and walk the perimeter. These are the signs visible without a ladder.
Missing shingles or visible patches. Even one or two missing shingles is a leak path waiting for the next rain. Multiple missing shingles in a localized area suggest wind damage. Missing shingles across multiple slopes suggest the roof has lost adhesion at scale, which is end-of-life.
Curling, cupping, or buckling shingles. Asphalt shingles lose flexibility as they age and as the petroleum in the shingle dries out. Edges that curl up are common in the last five years of a roof's life. Severe buckling across the field is end-of-life.
Dark patches or streaking where granules have washed away. The granules on the shingle surface are the UV protection. Once they wash off, the asphalt underneath degrades quickly. Patchy granule loss is a repair item. Uniform granule loss across multiple slopes is replacement-grade.
Sagging roof lines or visible dips. Look down the ridge from one end. A sag indicates structural problems below the shingles (decking rot, rafter failure, or improper load over time). This is rare and serious. Get a structural inspection before any roof work.
Granules in the gutter or downspout extension. Coarse, sand-like material at the bottom of the downspout means the shingles are shedding faster than they should. A handful of granules after a year is normal. A buildup that fills the downspout extension every six months is not.
Flashing rust streaks running down the siding. Look below every chimney, every wall-to-roof junction, and every vent pipe. Orange streaks mean the flashing is corroding and water is getting behind it. This is a repair item if isolated, a replacement consideration if it shows up at multiple locations.
Moss, algae, or lichen on the shaded slopes. Cosmetic in most cases, but heavy moss growth holds moisture against the shingles and accelerates degradation. A roof with extensive moss on the north slope is not failing because of the moss; it is failing because of the moisture the moss traps.
Five signs only visible from the roof
These signs require a roofer on the roof or a ladder at the eave. Do not climb a roof you do not know is sound.
Hail-impact bruising. Round, soft spots in the shingle surface that crush slightly when pressed. Hail bruising is what insurance adjusters specifically look for and what triggers a valid storm-damage claim. The bruises are usually invisible from the ground.
Exposed nail heads. Shingles installed in cold weather, or by undercrews working fast, occasionally have nails driven through the shingle face instead of into the nail strip. Each exposed nail head is a leak path. Sealing exposed nails is a standard repair.
Failed sealant lines between shingle courses. Asphalt shingles bond to each other via self-sealing strips that activate in heat. After fifteen to twenty years, those bonds can release, especially on lower-pitch roofs. A roofer can lift the shingle edges by hand on a failed roof.
Decking visible through the underlayment in the attic. Stand in the attic at noon on a sunny day. If you can see any daylight through the roof deck, there is a hole. Daylight at vent penetrations is sometimes normal; daylight in the field of the roof is not.
Inadequate or blocked ventilation. Look for ridge vent that has been painted over, soffit vents stuffed with insulation, or turbine vents that no longer spin. Bad ventilation cooks the shingles from below and cuts roof life by five to ten years. This is one of the most common reasons a young roof needs early replacement.
Age, climate, and the actual lifespan numbers
Shingle warranties do not predict lifespan. The marketing material says fifty years; the field service life is materially shorter, and it varies by climate.
Three-tab shingles: 15 to 20 years in mild climates. 12 to 17 in hail-belt or extreme-heat climates. Mostly out of new construction now, but on a lot of houses built before 2005.
Architectural (dimensional) shingles: 20 to 30 years in mild climates. 17 to 25 in hail-belt or extreme-heat. The current default for most residential re-roofs.
Class 4 impact-rated shingles: 25 to 40 years in mild climates. 22 to 32 in hail-belt. Worth the premium in hail-prone regions because of the insurance discount and the extended field life.
Metal roofing: 40 to 70 years for standing seam, 30 to 50 for screw-down panel. Higher install cost, substantially lower lifetime cost. Common in Texas hill-country and high-fire regions.
Tile or slate: 50 to 100+ years. The roof underlayment fails long before the tile does; expect to redo the underlayment at year thirty to forty without replacing the tile itself.
Climate adjustments: hail-belt regions (the corridor from north Texas through Oklahoma, Kansas, and Nebraska) reduce lifespan by three to seven years across all materials. Coastal regions with salt air reduce metal lifespan but not asphalt. High-UV regions (desert Southwest) reduce asphalt lifespan but not tile.
Repair versus replace: the cost crossover
The decision-rule that holds up across most jobs:
If repair cost is under 10 percent of replacement cost, and the roof has more than five years of expected life remaining, repair is the right call.
If repair cost is 10 to 30 percent of replacement cost, weigh the roof's remaining life. Five-plus years remaining = repair. Less than five years remaining = start budgeting for replacement and do a minimal repair now.
If repair cost is over 30 percent of replacement cost, replacement is almost always the better decision regardless of remaining life. The labor cost of repairing a failing roof is a rounding error compared to the cost of the roof failing again in eighteen months.
The exception is storm damage with insurance coverage. If a storm has triggered a covered claim, the insurance payout often covers full replacement at terms more favorable than the homeowner could reach paying out of pocket. The insurance-claim guide walks through how that process actually works.
What to do next
If you have read this far and at least two of the signs above apply to your roof, schedule an inspection. The right inspection is from a roofer who has operated under the same name at the same address for at least three years and who pulls the building permit in their own name on every job. The how-to-hire-a-roofer guide covers what to check before you let a contractor on the roof, and the questions-to-ask guide gives you the exact phrasing for the call.
Most decisions to replace a roof are made under pressure, in a crisis, from incomplete information. The way to beat that pattern is to know the signs ahead of the storm. If we cover your city, the report on our coverage page lists the local operators worth starting a conversation with.