Signs You Need a New Roof (and Signs You Don’t)

The clearest replacement sign is wear that shows up across the roof: HUD’s inspection guide says asphalt shingles that are losing their granules and starting to curl should be replaced. One leak at a chimney, a few missing shingles after a storm, or black streaks are local problems or discoloration, and they call for a repair or nothing at all.

The difference matters because a replacement is the largest roof decision an owner makes, and a repair-sized problem can look dramatic from the yard. One test sorts the signs.

The Roof-Wide Test That Sorts Every Sign

Ask two questions about anything you see. Is it on every slope, or in one place? And does it come from the shingles wearing out, or from one part failing?

A roof is a field of shingles plus a set of details: flashing, vents, valleys, edges. The shingle field ages together, because every shingle on a slope gets the same sun, rain and heat. When the field is worn out, the signs appear across the slopes, furthest along on the slopes that get the most sun. Details fail one at a time. A cracked pipe boot or lifted step flashing can let in a lot of water while the shingles around it have years left.

Wear spread across the roof points to replacement. A problem confined to one spot, however dramatic, points to a repair of that spot.

Here is how the test reads for the signs owners ask about:

The depth pages are shingle granule loss, wind damage to roofs, how to find a roof leak, black streaks, moss and lichen and sagging roof causes.

Signs That Point to the End of Service Life

These signs count toward replacement when they show up across the slopes, not in one patch.

• Granule loss with curling. HUD’s Residential Rehabilitation Inspection Guide, revised February 2000, says asphalt shingles that “begin to lose their granular covering and start to curl” should be replaced. Look for dark, smooth patches where the asphalt shows through, together with shingle edges turning up or down. For what each curl shape means, see curling, cupping and clawing shingles.
• Cracked, brittle or warped shingles on every slope. The National Roofing Contractors Association’s consumer resources page lists cracked, warped and missing shingles among what an inspection twice a year can turn up. A few are a repair. Many, spread across slopes, are wear.
• Repeated leaks from different places. One leak is a detail. New leaks appearing in different areas season after season point to a covering that no longer sheds water reliably.
• Shingles that break or lose pieces when a roofer handles them, reported in writing after a professional inspection.
• Soft decking in several areas, found by a roofer, which means water has been getting past the covering in more than one place.

Age adds context but does not decide on its own. A roof near the end of its expected range with the signs above is a replacement candidate; the same age with none of them may have more life left. For expected service life by material, see the lifespan ranges for each roofing material.

Signs That Point to a Repair, Not a Roof

These problems can cause real damage, but they sit in one place and are fixed in one place.

• A leak at one chimney, skylight, wall or vent. HUD’s guide names worn or loose flashing first among its roof checks. Flashing and penetrations fail on their own schedule, and replacing them does not require a new roof.
• A few missing or torn shingles after wind, on an otherwise sound roof. The roofer replaces them and checks the seal on the shingles around them.
• A cracked rubber boot around a plumbing vent pipe. It is a small part that can leak a lot.
• Clogged valleys or gutters. HUD’s guide flags debris in valleys and gutters as well. Water that backs up can find its way under the roof edge. Cleaning, not replacing, is the fix.
• One damaged area from a branch or a dropped tool.

Ask the roofer to write down the cause of each problem and whether it is local or roof-wide.

Signs That Look Bad but Don’t Mean Replacement

Some signs alarm owners more than they should, because they are visible from the street.

Black streaks. Dark streaks running down a slope are algae. The Asphalt Roofing Manufacturers Association’s technical bulletin on algae discoloration, revised June 2024, describes the problem as discoloration and says it is most widespread in the Gulf States and along the Northwest and Eastern Seaboards. On their own, streaks do not show the granule loss or curling HUD ties to replacement.

Some granules in the gutters of a recently installed roof. Loose granules left from manufacturing and handling can wash off a roof in its first seasons. The test is the same as for any granule question: is bare asphalt showing on the shingles? If not, it is not age wear.

An old stain on a ceiling that has stayed dry. It may record a leak that was fixed years ago. Check the attic above it after a rain. Dry wood and a faded ring point to history, not a current problem.

A shingle color that does not match after a repair. Patched areas can look different from the rest of the roof. That is a matching question, not a sign of failure.

Signs That Need a Structural or Storm Assessment First

Two kinds of signs skip the repair-or-replace question and go to a different specialist.

A sagging ridge, a dipping rafter line, or a wavy deck points to the structure underneath. New shingles do not fix framing, so get the structure evaluated before any roofing quote; sagging roof causes and warning signs explains which sags are emergencies.

Damage across several slopes right after hail or high wind may look like end-of-life wear but comes from one event. That is a storm and insurance question first. Photograph the damage and the date, and talk with your insurer before you sign a replacement contract.

Plan a Replacement or Book a Repair?

If the wear signs show up across the roof, and especially if granule loss and curling appear together, book a replacement assessment and ask the roofer to say in writing which signs are roof-wide. Count the layers too: under its re-roof policy, which follows the 2018 International Residential Code (IRC), Lincoln, Nebraska requires all layers to come off when a roof already has two or more. Your town may enforce a different code edition or its own amendments, so check your building department’s rule before you compare quotes.

If the signs are confined to one area, book a repair and ask for the cause in writing; what drives the price of a roof repair shows what that quote should account for.

Get a second opinion before you sign a replacement contract when the recommendation rests only on age, streaks or a single leak, or when the roofer cannot show roof-wide wear in photos. A second roofer reviewing the same slopes, or the same photos, is a fair check on a large decision. If you are weighing the cost of repairs against a replacement, the repair versus replacement framework works through the numbers.

Before either call, photograph each sign with its slope and location from the ground or the attic, never from the roof, and if you want a neutral look first, see how the different roof inspections compare.

This guide is general information for U.S. homeowners, not legal, insurance, tax, or engineering advice. Codes, laws, and policy terms vary by location and change over time; confirm details with your local building department, your insurer, or a licensed professional.

Sources

• Residential Rehabilitation Inspection Guide, U.S. Department of Housing and Urban Development
• Resources (warranties, maintenance, weather events), National Roofing Contractors Association
• Algae Discoloration of Roofs (Technical Bulletin), Asphalt Roofing Manufacturers Association
• Re-Roof Policy, City of Lincoln, Nebraska