Roofs do not fail dramatically. They fail gradually, and then suddenly. The gradual part is visible if you know what to look for. Here are fifteen specific things to check, organized from what you can see without a ladder to what requires a professional inspection.
What you can check without a ladder
1. Granules in your gutters
Run your hand through the gutter trough. Granules look like coarse sand or pebbles and are typically grey or colored to match your shingles. Finding some is normal on a newer roof. Finding thick accumulation means the granule layer is actively detaching. The granule layer is the shingle's UV protection. When it goes, the asphalt underneath degrades rapidly. After any significant rain or wind event, check your downspout discharge for granule deposits.
2. Curling or cupping shingles
Shingles curl in two ways. Cupping curls the edges up, like a bowl. Clawing curls the middle up and the edges down. Both are signs of moisture imbalance, aging asphalt, or inadequate attic ventilation. Either pattern means the shingles are no longer lying flat against the roof deck, which compromises their ability to shed water and increases wind vulnerability. You can see curling from the ground on the lower courses of the roof.
3. Missing shingles
Visible from the driveway. Missing shingles leave the underlayment and decking exposed. In Oklahoma, where rain can follow wind by minutes during a storm system, exposed decking can take water damage within hours of a shingle blowing off. Missing shingles are an immediate repair item, not a wait-and-see.
4. Visible sagging
A healthy roof surface is flat or uniformly sloped. Sagging areas, particularly in the middle of a slope or near the valleys, indicate structural problems: compromised decking, failed framing, or long-term moisture damage. This is not a repair. A sagging roof section needs a professional assessment immediately.
5. Moss or algae growth
Green or black staining on the shingle surface. In Oklahoma, this typically appears on north-facing or heavily shaded slopes where moisture lingers. Algae causes black streaking. Moss retains moisture against the shingle surface and accelerates granule detachment and mat degradation. Moderate algae can be treated. Significant moss growth with physical lifting of shingles indicates underlying moisture problems.
6. Damaged or missing ridge caps
The ridge cap is the capping material at the peak of the roof, where two slopes meet. It is exposed to direct wind, hail, and UV. It also covers the most vulnerable point on the roof: the ridgeline. Cracked, missing, or visibly deteriorated ridge caps are a leak path and a wind vulnerability. You can usually evaluate ridge cap condition with binoculars from the yard.
7. Flashing damage around chimneys and vents
Metal flashing at every penetration, chimney, skylight, and dormer intersection. From the ground, look for lifted edges, visible rust or corrosion, or gaps where the flashing meets the chimney or wall. Flashing failures are among the most common sources of roof leaks and are often repairable without full replacement. But failing flashing on a roof that is already 18 years old is a sign of system-wide age.
What to check from inside
8. Water stains on ceilings or walls
Brown or yellow staining on interior ceilings is the most visible indicator of active or past water intrusion. Fresh stains after a recent storm are an emergency. Old stains from a leak that has since dried may indicate a problem that has been building for months. Either warrants a roof inspection. Note the location of stains and tell your inspector: they will find the entry point above that location.
9. Daylight visible in the attic
Access your attic on a clear day, turn off your flashlight, and let your eyes adjust. Pinpricks of light coming through the roof deck mean holes. Gaps at the ridgeline, pipe penetrations, or eave edges can also show light. Daylight means water has a path in. This is immediate.
10. Soft spots on the decking
In the attic, press against the underside of the roof decking. Solid OSB or plywood resists pressure. Soft, spongy, or visibly sagging areas indicate moisture damage, rot, or delamination. Compromised decking cannot support new shingles and must be replaced regardless of what the exterior shows.
11. Excessive heat in the attic
On a summer day in Tulsa, a properly ventilated attic should be hot but not unbearable. If your attic feels like an oven with no air movement, ventilation is inadequate. This accelerates shingle degradation from below, raises energy costs, and shortens the lifespan of everything in the attic. Not a direct sign of roof failure, but a condition that accelerates it.
Signs that require professional assessment
12. Hail bruising on shingles
Circular dark marks on the shingle surface, soft to the touch, indicating a fractured mat beneath the granule layer. Most hail damage is not visible from the ground. After a confirmed hail event in your zip code, a professional inspection is the only way to know the actual damage extent.
13. Granule loss pattern
Not just granules in gutters, but the pattern of granule loss on the roof surface. Widespread uniform loss is weather-related aging. Loss concentrated in one area may indicate a manufacturing defect. Loss in a random scattered pattern across all slopes after a storm is a hail signature. The pattern matters for both damage documentation and cause determination.
14. Underlayment condition
The underlayment is the layer of felt or synthetic material between the shingles and the decking. It is the last line of defense against water intrusion when the shingles fail. Deteriorated underlayment that has dried, cracked, or torn provides no protection when a shingle is missing or damaged. Underlayment condition is only visible when shingles are removed.
15. The age calculation
Know how old your roof is. If you do not know, you can often find it in past homeowners insurance paperwork, building permits, or ask a neighbor who has lived nearby long enough to remember. A roof over 20 years old on standard architectural shingles in Oklahoma has used most of its realistic lifespan regardless of visual condition. At that age, the question is not whether to replace, but when, and which material to choose.
Frequently asked questions about roof warning signs
How do I know if my roof needs to be replaced or just repaired?
The key variables are age, extent of damage, and decking condition. A roof under 15 years with isolated damage is usually a repair candidate. A roof over 20 years with multiple signs from this checklist is typically a replacement. If several of the 15 indicators below apply to your roof, schedule a professional inspection to determine scope.
Can I check my roof for damage without climbing on it?
Yes. Most of the warning signs visible to a homeowner can be observed from the ground, from inside the attic, and from inside the home. Granules in gutters, interior water stains, sagging areas, and visible daylight in the attic are all checkable without setting foot on the roof surface. A professional inspection fills in what you cannot see safely.
What does granule loss mean for my roof?
Granule loss means the ceramic coating on your shingles is degrading. The granule layer protects the asphalt mat from UV and acts as a wear surface. When granules are gone, UV exposure accelerates asphalt oxidation and brittleness. Granule loss is one-way: it does not reverse. Significant granule loss indicates the shingles have used a large portion of their useful life.
How long can I wait after seeing signs of roof damage?
It depends on the sign. Active interior water intrusion requires immediate attention to prevent structural and mold damage. Granule loss and surface cracking on an older roof indicate degradation but not necessarily emergency. Storm damage from a confirmed hail or wind event should be inspected and documented within 30 days, before evidence degrades and insurance filing windows tighten.
Checking the boxes on this list?
Free inspection that covers all 15 indicators, plus drone footage and moisture readings. We tell you what we find, not what we want to sell you.