When Hail and Wind Hit: What Really Happens to a St. Louis Roof

A Metro St. Louis Case Study and Homeowner Guide

Why this metro keeps getting hit

Anyone who has lived through a spring in St. Louis County knows the pattern. A warm afternoon, a line of storms crossing the Missouri River, and twenty minutes of hail and straight line wind that changes the condition of every roof in the subdivision.

The numbers back up what homeowners already feel. In 2026 alone there were twelve hail reports within ten miles of the St. Louis city center, with the largest stone measured at 1.50 inches, roughly ping pong size, and local storm surveys recorded wind events that stripped shingles from homes across St. Louis County. Statewide, hail causes an estimated $49.7 million in losses per year in Missouri, and while thunderstorms can happen in any month, most occur between May and August. One national carrier reported that Missouri now carries the second highest total of hail claim dollars paid in the country, up 10 percent year over year, and that March 2026 storms alone generated more than 50,000 claims across the Midwest.

Then there is the tornado and downburst exposure layered on top. The March 14, 2025 outbreak put twelve confirmed tornadoes in the St. Louis warning area, and the May 2025 tornado tracked through Clayton and across the Fontbonne campus, causing minor to major roof damage to homes along its path.

If your home sits anywhere from Wildwood and Ellisville through Ballwin, Chesterfield, Kirkwood, Webster Groves, south city, or across into St. Charles County, your roof has almost certainly taken impacts in the last three seasons.

The case study: a Ballwin home that looked fine

The following is a composite drawn from the kinds of jobs we see every season in west St. Louis County. Details are representative rather than a single named customer.

• The property. A two story home built in 2004, reroofed in 2015 with standard architectural shingles rated for 110 mph wind. Roughly 32 squares, two dormers, three valleys, a chimney with step flashing, and aluminum gutters.
• The storm. An evening supercell drops quarter to half dollar size hail for about eight minutes, followed by a wind gust front measured nearby in the 60 mph range.
• What the homeowner saw. Nothing. From the driveway the roof looked identical to the day before. A neighbor’s siding was dented and a gutter was pulled loose two doors down, so the homeowner assumed his house was spared.
• What was actually there. Eighteen months later the ceiling in the upstairs hallway showed a brown ring. By then:
  • The test squares on the west and south slopes carried nine to fourteen hail impacts each, well past the threshold most adjusters use to call a slope damaged.
  • Granule loss at the impact points had exposed bare asphalt in dozens of places.
  • Several shingles were bruised, meaning the mat underneath had fractured even though the surface looked whole.
  • The sealant strips along two courses on the windward slope had broken loose, so the shingles were no longer bonded and were lifting with every gust.
  • The ridge cap was creased, and two pipe boot collars were split.
  • The claim deadline in his policy had passed.

He paid for the full replacement out of pocket, plus drywall, insulation, and paint. A claim filed in the first sixty days would likely have covered the roof, the gutters, and the screens, less his deductible.
That is the entire lesson of this article. Storm damage is rarely visible from the ground, and the clock on the claim starts the day of the storm, not the day you see the stain.

What hail actually does to roofing material

Asphalt shingles are three layers doing three jobs. Granules on top, asphalt in the middle, fiberglass mat underneath holding it all together. Hail attacks all three.

Granule loss
Impacts knock granules away at the strike point, sometimes leaving a visible depression, and can crack the surfacing so that fractures radiate outward from the point of impact. Those granules are the wearing surface and the sunscreen. Once they are gone, the asphalt base mat is exposed to ultraviolet rays and mechanical abrasion, and degrades faster than the rest of the roof. The loosened granules wash into the gutters and pile up at the downspouts, which is often the very first clue a homeowner gets.

Bruising
When a stone hits, the top of the shingle is compressed while the bottom is pulled in tension. The bottom expands and can crack. If that fracture does not pass all the way through, it is called a bruise, and it is still functional damage because it leaves a soft spot that is vulnerable to further damage. A bruise feels spongy under a thumb, like a bruised apple. It will not show up in a photo taken from the yard.

Mat fracture
This is the one that matters most. A fractured fiberglass mat may not be immediately visible, and hidden mat damage can develop into cracks and tears later as the shingle wears. That is why a roof can pass a casual look in May and start leaking the following spring.

Broken sealant strips
Every shingle is glued to the one below it by a factory applied sealant strip that cures in the sun. Storm impact can loosen that strip, and the damage may either be visible or simply weaken the bond, creating the possibility of future blow off.

Metal and accessories
Hail dents flashing, vents, pipe collars, drip edge, gutters, and downspouts. Dented and loosened metal stops directing water where it was designed to go, and gutters are usually the first damage a homeowner notices from the ground.

What wind does

Wind damage works differently. It does not need to break anything to defeat a roof.

Wind gets under the leading edge of a shingle and peels it upward. Once the sealant bond breaks, that shingle becomes a flap. It may fall back into place looking perfectly normal, but it is now loose, and every subsequent storm works it further. The telltale is a crease, a horizontal line across the shingle where the mat was bent past its recovery point. A creased shingle has already failed even though it is still on the roof.

Wind also concentrates at ridges, hips, rakes, eaves, and any slope facing the prevailing direction. Those are the first areas we inspect. Hail and wind together are the worst combination, because hail breaks the bond and wind then exploits it.

One more thing worth knowing: manufacturer warranties generally exclude blow offs and broken sealant bonds caused by winds above the shingle’s rated wind coverage. The manufacturer is not going to pay for a storm. Your insurance policy is the instrument designed for that.

How the leak actually starts

Homeowners often ask why a roof that is missing only a few granules eventually leaks. The path is predictable.

1. Surface breach. Granule loss and mat fracture create a spot where water is absorbed instead of shed.
2. Freeze and thaw. St. Louis winters push water into those fractures, freeze it, expand it, and widen the crack. One winter turns a bruise into a split.
3. Underlayment exposure. Water reaches the felt or synthetic underlayment. That layer is a backup, not a roof. It is also full of nail holes.
4. Deck saturation. Water finds a nail penetration or a seam and reaches the plywood or OSB deck. Sheathing swells, fasteners loosen, and the shingles above lose holding power.
5. Interior intrusion. Water travels along rafters before it drops, so the stain on your ceiling is frequently several feet from the actual breach.
6. Secondary damage. Wet insulation loses R value and stops working. Mold can establish in a dark cavity within days. Framing rots. Wet drywall fails. Water that reaches a junction box becomes an electrical hazard.

By the time a ceiling stain appears, the roof deck has usually been wet for months.

The real risks of leaving it alone

You lose the claim. Many property policies require storm damage claims to be filed within a set window after the date of loss, commonly twelve months, and once that anniversary passes a carrier can deny coverage even if the damage is discovered later. Check your own policy language, because terms vary by carrier. The practical rule is simple. Report promptly.

You cross the ten year line. Most carriers apply a ten year rule to roof age. Before that mark, a covered loss is typically settled at replacement cost. After it, many policies drop to actual cash value, meaning depreciation is subtracted and you absorb the difference. A roof that was eight years old at the time of the storm and twelve years old when you finally file is a very different settlement.

Repairs stop being repairs. Shingle lines are discontinued constantly. Missouri follows reasonable matching standards, so if replacement materials do not reasonably match the existing roof in color or texture, a full slope or full roof replacement may be warranted, but that argument only exists if the claim was filed on time.

The cost multiplies. A roof replacement is one trade. A roof replacement plus deck sheeting, insulation, drywall, paint, and mold remediation is five, and only the roof portion was ever going to be covered.

Resale problems. Buyers order inspections. A four year old storm damaged roof with no claim history becomes a price concession, a lender condition, or a dead deal.
Coverage consequences. Carriers are increasingly strict on roof condition at renewal, and percentage based wind and hail deductibles are common in this market. A visibly deteriorated roof can drive nonrenewal or an exclusion.

What to do if you think you were hit

In the first 48 hours

• Stay on the ground. Do not walk a wet or steep roof. Every year people are injured doing this.
• Photograph everything from ground level. Gutters, downspout outlets, screens, siding, deck furniture, air conditioner fins, vehicles, and any dented metal.
• Look for granule piles at the base of downspouts. That is your earliest indicator.
• Check ceilings, closets, and the attic with a flashlight for staining or daylight.
• If water is actively entering, move belongings, contain the water, and call for an emergency tarp.
• Save the date. Note the storm date and keep the local news coverage or a weather report for your address. Proof of loss starts with proving a storm occurred.

In the first two weeks

• Get a professional inspection and a written damage report before you call the carrier, so you know whether you actually have a claim.
• Read your declarations page. Find your deductible, whether it is a flat dollar amount or a percentage of the dwelling value, and whether you carry replacement cost or actual cash value on the roof.
• File the claim yourself if the damage supports it. Be present when the adjuster inspects.
• Do not authorize permanent work before you know the scope.

Missouri law protects you, and you should know it

Missouri statute RSMo 407.725 governs how any roofing contractor may behave on insurance funded work, ours included. Three provisions matter to you:

1. A contractor may not advertise or promise to pay or rebate any portion of your insurance deductible as an inducement to the sale, and that includes allowances, discounts, gifts, credits, or referral fees of monetary value.
2. A contractor may not represent or negotiate on your behalf on an insurance claim for roof or exterior work, and may not advertise that it will.
3. If you have signed a contract to be paid under a property and casualty policy, you may cancel it before midnight on the fifth business day after you receive written notice from your insurer that all or part of the claim is not covered.

A violation of this section is treated as an unfair practice under the Missouri Merchandising Practices Act.

Knowing these three provisions tells you what a compliant offer looks like before you sign anything. An offer to absorb your deductible or to handle the insurance company on your behalf is not something Missouri permits a roofing contractor to make, so you can set that expectation for yourself from the start.

A few other things worth confirming with anyone you hire: a permanent local address, a current certificate of insurance, whether they pull the permit, and payment terms that do not require a large cash deposit before work begins.

What Anvil Roofing Co does about it

We are a local roofing company based in Ballwin serving the St. Louis metro, and we work storm claims the way they are supposed to be worked.

Free documented inspection. We assess the full system, not just the shingles. Test squares per slope with impact counts, bruising checked by hand, sealant bond tested, creasing identified, flashing, vents, boots, ridge, drip edge, gutters, and siding all photographed. You receive a written report whether or not you have a claim, and if the roof is sound we will tell you so.

An honest claim opinion. Sometimes there is real damage. Sometimes it is weathering or blistering that a carrier will not cover. Knowing the difference before you open a claim protects your loss history.

Adjuster meetings, done correctly. We will meet your adjuster on site and show our documentation so nothing is missed. Under Missouri law your claim is yours to negotiate. We do not represent you on it, and we do not touch your deductible. What we do is make sure the damage is visible, measured, and on the record.

Supplements when scope is missed. Adjusters work fast and work broadly. If the approved scope leaves out code required items, ventilation, valley metal, drip edge, ice and water barrier at eaves, or accessories, we document it and submit the supporting detail.

Emergency tarping. Active leaks get secured first. In this metro the next round of rain is often within 48 hours.

Full replacement and exterior repair. Roofing, siding, and gutters, so one contractor carries the whole exterior scope. We pull permits, we carry insurance, and our contracts include the Missouri statutory notices they are required to include.

Workmanship you can call back. We are based in Ballwin and we are here next season and the season after. If something needs attention in year three, you are calling the same company that installed it.

Common questions

My neighbor got a new roof and I did not. Why? Hail falls in swaths and wind hits slopes differently. Two houses on the same street can have genuinely different outcomes. It is also possible your damage is there and nobody has looked properly.

Will filing a claim raise my rates? Weather claims are treated differently from liability claims, but carriers do consider claim frequency. That is exactly why you want an honest inspection first rather than filing on a hunch.

My roof is not leaking. Do I really need to do anything? A hail damaged roof almost never leaks immediately. The damage is to the shingle’s remaining service life. Hidden mat damage develops into cracks and tears later, and by then the claim window has usually closed.

How old is too old? Ten years is the practical line most carriers draw on roof age. If your roof is approaching that mark and you have had storms, get it documented now.

What does an inspection cost? Nothing. And we will put the findings in writing either way.

The bottom line

In metro St. Louis, the question is not whether your roof will be hit. It is whether the damage gets found while the claim is still live and while your roof is still young enough for the carrier to pay replacement cost rather than depreciated value.

A ceiling stain is not the start of the problem. It is the receipt for a storm you let pass.