10 Signs You Need a New Roof in St. Louis

Know the signs before a small problem becomes a big one. 10 clear indicators St. Louis homeowners should look for — and what each one means for your roof.

Your roof doesn't fail overnight. It sends signals for months — sometimes years — before the first ceiling stain appears. Recognizing those signals early is the difference between a planned replacement on your schedule and an emergency repair during the next storm. These are the ten most reliable signs that your St. Louis roof has reached the end of its useful life.

Sign 1: Granules Filling Your Gutters

Asphalt shingles are coated with mineral granules that provide UV protection and fire resistance. As shingles age, those granules loosen and wash off — they end up in your gutters and at the base of downspouts. Some granule shedding is normal on new shingles (manufacturing excess). Heavy granule accumulation on a 15-plus-year-old roof signals accelerated aging. Check your downspout discharge areas after rain: granules that look like coarse sand or gravel are what you're looking for.

Sign 2: Curling or Cupping Shingles

Curling takes two forms. Cupping is when the edges of a shingle curl upward — caused by moisture imbalance between the top and bottom of the shingle, often accelerated by poor attic ventilation. Clawing is when the middle of the shingle lifts while the edges stay flat — a sign of advanced aging or heat exposure. Either form means the shingles have lost their flexibility and weather-sealing integrity. In St. Louis's freeze-thaw climate, curled shingles are prone to cracking, lifting in wind, and admitting water.

Sign 3: Exposed Mat or Bare Spots

When granules have shed completely in an area, you'll see the darker fiberglass or organic mat beneath. These bare spots accelerate UV degradation and are direct paths for moisture infiltration. On a new roof, concentrated bare spots in circular or oval patterns are a sign of hail impact — the granule loss is impact-driven rather than age-driven, and the pattern matters for insurance documentation.

Sign 4: Missing Shingles

Individual missing shingles after a windstorm can be repaired if the roof is otherwise sound. The problem: matching shingles from a roof installed 10–15 years ago is often impossible. Manufacturers discontinue color runs, and weathered shingles don't match new ones. More importantly, missing shingles indicate the roof may be at the threshold of wind resistance failure — if one came off, others are close. Multiple missing shingles in the same area after a wind event often signals the decking nailing pattern has failed and the whole slope is compromised.

Sign 5: Age — 20 Years or More

Architectural (dimensional) asphalt shingles carry 30-year warranties, but warranty life and service life aren't the same thing. In St. Louis, with summer heat cycling, UV exposure, and annual hail events, a realistic service life is 18–25 years for a properly installed architectural shingle roof with adequate ventilation. A roof older than 20 years should be on your inspection radar every year. After 25 years, replacement planning is prudent even if no obvious symptoms appear — the system is borrowed time.

Sign 6: Valley Wear and Deterioration

Roof valleys — the V-shaped channels where two slopes meet — carry concentrated water volume during rain events. They wear faster than flat slopes because of the volume and velocity of water flowing across them. Look for exposed flashing metal, worn-through shingles, or soft spots along valley lines. Valley failures are among the most direct paths to active interior leaks because the water volume is high and the flow is concentrated into a seam.

Sign 7: Flashing Failure

Flashing is the metal or rubberized material sealing the transitions between your roof and chimneys, skylights, dormers, pipe penetrations, and walls. It's the most failure-prone part of any roofing system. In St. Louis, contractor-applied caulk over flashing is a common shortcut — it lasts two to four years before cracking. Look for rust-stained mortar at chimney bases, visible gaps between flashing and masonry, or caulk that's cracked and pulling away. Failed flashing produces active leaks that target the structure at the worst possible points.

Sign 8: Attic Leaks, Staining, or Daylight

Get a flashlight and spend five minutes in your attic after heavy rain. Active dripping is obvious — but so are older stains on rafters or sheathing (dark water marks, white salt deposits, or black mold patches) that indicate intermittent leaking that dried before you noticed. Daylight visible through the roof deck when you turn the flashlight off is an immediate concern — any gap large enough for light is large enough for water, insects, and heat transfer.

Sign 9: Sagging Roof Deck or Soft Spots

A properly installed roof deck is rigid. If you can see a visible dip or wave in the roofline from the ground, the decking has been compromised — typically by prolonged moisture exposure that caused the OSB or plywood to delaminate or rot. Soft spots underfoot (if you can safely access the roof) confirm the same. Sagging decking means the structural foundation for the new shingle system is compromised — no shingle installation should proceed without deck repair or replacement in those areas.

Sign 10: Multiple Repairs, Patches, or Mismatched Sections

A roof that has been patched multiple times is telling you something. Each repair addresses a symptom without fixing the underlying condition — shingles that are past their service life, ventilation that's accelerating degradation, or flashings that have failed system-wide. Visibly mismatched shingle sections from previous repairs are a cosmetic indicator of this pattern. When repair costs begin to stack up toward 30–40% of replacement cost, or when a second repair is needed within two to three years of the first, replacement is typically the more economical path.

What to Do If You See These Signs

Two or more of these signs together — especially on a roof older than 15 years — warrant a professional inspection. An inspection by a certified roofing contractor gives you a documented condition assessment: what's wrong, what's urgent, and what can wait. That documentation is also useful if a storm hits before you've replaced the roof — it establishes pre-existing condition vs. storm damage.

Revolve Construction provides free, no-obligation inspections across the St. Louis metro — St. Louis City, St. Louis County, Jefferson County, and surrounding communities. We photograph everything, explain what we find, and give you options — repair, monitor, or replace — without pressure. Call (314) 400-8006 or schedule online.

How to Look at Your Roof Safely From the Ground

You do not need to climb on your roof to assess most of these signs. From ground level with binoculars on a clear day, you can see shingle condition, ridgeline straightness, valley integrity, chimney flashing gaps, and missing shingles on all slopes. Walk the full perimeter of the house and check each slope from multiple angles — what is hidden from the front may be obvious from the back or side. Take photos on a clear day with good light; the angle of sunlight matters for seeing texture and granule coverage. The attic inspection requires access but no roof climbing — a flashlight and five minutes in your attic gives you signs 8 and 9 from the inside.

Repair vs. Replace: How Professionals Decide

The repair-versus-replace decision has a clear framework. If isolated damage exists — a few missing shingles, a failed pipe boot, a cracked valley — on a roof that is otherwise in good condition and less than 15 years old, targeted repair is typically the right call. If the damage is widespread, if the roof is within five years of its expected service life, if the deck is compromised in multiple areas, or if the insurance claim scope covers full replacement anyway — replacement makes more economic sense. The hidden cost in repeated repairs: each repair on an aging roof is often temporary because the underlying system continues to degrade. A roof that gets repaired three times in five years may cost more in total than a replacement would have at the first repair.

The Cost of Waiting: Water Damage Math

A roof that is visibly failing but not yet actively leaking has a clock on it — and when the leak begins, secondary damage moves fast. A slow leak over a single winter can produce: drywall replacement and painting in one or more rooms, insulation replacement in the affected attic area, mold remediation if moisture was not addressed quickly, and potential structural repair if rafters were repeatedly saturated. The cost of that secondary damage typically exceeds the cost difference between repairing and replacing the roof when the warning signs were first visible. Acting on three or more of the ten signs in this guide — particularly on a roof older than 15 years — is almost always the more cost-effective decision.

Getting a Second Opinion

If you have seen two or more of these signs and a contractor has recommended replacement, getting a second opinion from a different certified contractor is reasonable — particularly if the first recommendation came from a door-knocker or post-storm solicitation. A contractor who is confident in their assessment welcomes a second opinion: it confirms their scope and builds trust rather than undermining it. Two independent recommendations that align on replacement scope is strong evidence that the call is correct. Two recommendations that diverge significantly warrant asking both contractors to explain what specifically they found to support their position.