How to Identify Wind Damage on a Roof (Adjuster's Field Guide)

If a storm just rolled through and you are trying to figure out whether your roof actually took wind damage — or whether what you are seeing is normal wear — this guide walks you through the same signs a trained adjuster checks. The short version: real wind damage leaves physical deformation. Shingles that wind has damaged are creased, folded, torn, or missing. A shingle that has simply come unsealed and lies flat, with no crease or tear, is not, by itself, evidence of wind damage. Learning that one distinction is most of the battle.

To identify wind damage on a roof, look for creased, folded, torn, or missing shingles concentrated along the eaves, rakes, ridges, and corners — the areas where wind uplift is highest. Lift a few tabs by hand to check for broken seals you cannot see from the ground, then check the attic and ceilings for water intrusion. Confirm the damage lines up with a verifiable wind event using the NOAA storm record, and document each damage mode with close-up and wide-context photos before you call your insurer. Here is the full inspection, step by step.

Quick-reference: what to check

1. Walk the perimeter from the ground and scan the eaves, rakes, ridges, hips, and corners — wind damage concentrates there, not in the field of the roof.
2. Look for the four damage modes that define genuine wind damage: creases, folds, tears, and missing shingles (or portions of shingles).
3. Lift tabs by hand to find broken seals and subtle creases that are invisible from a distance. This often requires tactile pressure, not just a look.
4. Distinguish wind damage from mere unsealing — a flat, unsealed shingle with no crease or tear is not wind damage on its own.
5. Check other roof materials by their own signs — displaced or broken tile, loosened or backed-out metal fasteners, lifted or separated seams.
6. Inspect the attic and interior for water stains, damp insulation, or mold that signal hidden intrusion.
7. Document collateral evidence — gutters, fences, window screens, and debris fields that corroborate a wind event and its direction.
8. Pull the NOAA storm record for the loss date to tie the damage to a verifiable wind event.
9. Photograph every damage mode close-up and in wide context, including hand-lifted tabs showing broken seals.
10. Get a qualified inspection before making permanent repairs — temporary tarping to prevent further damage is fine and usually reimbursable.

Before you climb up: how wind actually damages a roof

Wind damage to an asphalt-shingle roof is, at its core, a story about one thing: the seal.

Modern asphalt shingles are self-sealing. Each course bonds to the one below it through a strip of temperature-activated adhesive — the sealant strip. When that bond is intact, the shingle lies flat and tight, and the wind has nothing to grab. The Insurance Institute for Business & Home Safety (IBHS), which runs full-scale wind testing on roof assemblies, puts it plainly: "the most important factor affecting high-wind performance for self-sealing asphalt shingles is the strength of the seal between shingles." Improvements in those adhesives, IBHS notes, have "yielded dramatic increases in the wind ratings" of modern shingles.

Here is why that matters for your inspection. Once the seal breaks — whether from wind, age, a cold-weather installation, contamination, or years of thermal expansion and contraction — the leading edge of the shingle becomes a lever. Wind gets underneath it, lifts it, and the uplift force on the whole shingle climbs. Peer-reviewed wind-engineering research published in the Journal of Wind Engineering & Industrial Aerodynamics (2023) tested full-scale roof panels in straight winds up to 155 mph and found that "progressive unsealing (not loss of strength) is a culprit" — the seal lets go along the leading edge first, and failure cascades from there. A companion 2014 study reached the same conclusion: partially unsealed field shingles are more vulnerable to wind uplift than sealed ones.

This is the single most consistent finding across every credible source on the subject — IBHS, the National Roofing Contractors Association (NRCA), peer-reviewed wind engineers, and forensic engineering firms like Haag all agree the seal is the controlling variable. It drives two things you need to understand before you inspect:

Wind damage concentrates where uplift is highest. Wind does the most work at the roof's edges — the eaves, the rakes (the sloped side edges), the ridges, the hips, and the corners. A shingle roof "has maximum resistance when the wind is blowing at a 90° angle to the length of the shingle," InterNACHI's inspection guidance explains, which is the case when wind hits straight at the eave. But when wind strikes the rake, it meets a much smaller bonded area — "a maximum of ¾-inch wide" of adhesive strip — and "can then lift the tab and enter beneath the affected shingle, increasing the uplift forces on that entire shingle." That is why genuine wind damage clusters at edges and corners, and why damage scattered uniformly across the field more often points to age.

A printed wind rating is not a field wind-speed guarantee. Shingles carry laboratory wind ratings you may see cited — Class F, Class H, "rated to 150 mph." Those ratings are useful for comparing products, but they do not tell you the wind speed a roof will survive once it is installed and aging on your house. ASTM states it directly of its wind test, and NRCA reiterates it: "The results of this test do not directly correlate to wind speeds experienced in service." A shingle with a degraded seal can fail at a fraction of its printed rating. Do not reason from "these were 130 mph shingles, so it couldn't be wind." Seal condition, not the label, governs the outcome.

With that mental model, the inspection becomes straightforward: you are looking for physical deformation, concentrated in the high-uplift zones, that ties to a real wind event.

A quick word on wind ratings

You will run into wind-rating numbers, so it helps to know what they mean — and what they do not. There are three test regimes you may see referenced:

• ASTM D3161 is a fan-driven air-stream test. Per NRCA's Mark Graham, it certifies shingles as Class A (passes at 60 mph), Class D (90 mph), or Class F (110 mph). It is used mainly for shingles that lack factory self-sealing strips.
• ASTM D7158 is the primary test for self-sealing shingles. It compares uplift force against uplift resistance and assigns Class D (design wind speed up to 115 mph), Class G (up to 150 mph), or Class H (up to 190 mph). The classifications assume the shingles are on a building in Exposure Category B or C, with a mean roof height of 60 feet or less and no topographic wind speed-up effects.
• UL 580 and UL 1897 test the uplift resistance of the roof-deck assembly and roof-covering attachment, expressed as pressure classes. UL 580 testing "stops at Class 90, with a 52.5 psf allowable limit"; UL 1897 continues from there to higher loads.

The practical takeaway repeats the point above: because a wide variety of shingles now earn the top Class H rating under D7158, and because the lab numbers "do not directly correlate to wind speeds experienced in service," the class on the wrapper is a weak field discriminator. NRCA's position is that these standards "provide a useful, credible means of differentiating among asphalt shingle products" — good for shopping, not for predicting what an installed roof will withstand.

You may also see graduated wind-speed thresholds describing when different damage modes appear — for example, that seals can break and shingles begin to lift around 45 to 57 mph, that shingles can be creased or torn from the roof around 58 to 74 mph, and that hurricane-force winds of 75 mph and up cause widespread shingle loss and possible deck or structural damage. Treat these as industry guidance rather than settled science. They are directionally consistent with the seal-fails-before-tear sequence that the peer-reviewed research establishes, but the exact band cutoffs are not confirmed on a primary IBHS or National Weather Service table. The more reliable rule is the one the engineering literature actually supports: there is no single clean "failure speed," because a shingle with a degraded seal fails at a far lower wind speed than its printed rating. Inspect for deformation, not for a magic number.

The four signs of genuine wind damage (asphalt shingles)

For asphalt shingles, the definition of wind damage is narrow and well-established. The canonical statement comes from a 2017 technical paper by Lopez and colleagues, published through IIBEC (the International Institute of Building Enclosure Consultants):

"Any sealed-down shingle affected by wind will leave lasting evidence of the event having occurred. This evidence is exhibited as creases, folds, tears, missing shingles or portions of shingles, or any combination thereof."

And the corollary, which is just as important:

"A shingle that is simply not adhered and is not creased, folded, torn, or missing, is not evidence of wind-caused damage."

So you are looking for four things. Here is what each one looks like, what causes it, and what to record.

Sign 1: Creasing

What it looks like. A crease is a line across the shingle where it was bent back on itself by uplift and did not fully return. On a weathered shingle it can be obvious — a horizontal fracture line, often with granule loss along the crease. On a newer, more pliable shingle it can be nearly invisible. The Lopez paper notes that on new shingles "the creases required very close inspection and tactile manipulation (i.e., placing hand pressure from underneath the shingle) of the granular surface to observe the crease; nonetheless, they were present and observable."

Why it matters. Creasing is the clearest fingerprint of wind. The mechanism, per Haag's forensic engineers: under enough uplift "the bottom edge of the shingle suddenly becomes detached at the shingle's sealant strip," and the shingle "either lifts and tears out around the nails, or the individual shingle tabs will lift and fold." A crease means the shingle was physically bent by wind — and a creased shingle has lost integrity at the fold even if it is lying flat again.

What to document. Photograph the crease line close-up, then lift the shingle gently to show the fold and the broken seal beneath. Because subtle creases hide, run a flat hand under suspect tabs — you will often feel a crease you cannot see.

Sign 2: Folding

What it looks like. A fold is a crease taken further — the tab has lifted and bent over, sometimes still in that position, sometimes folded and flopped back. Haag describes the tabs that "lift and fold" once the sealant releases.

Why it matters. A folded tab is unambiguous physical deformation. It also exposes the underlayment and the course below to water until it is repaired.

What to document. Capture the fold in place before you touch it, then a close-up of the crease at the base of the fold. Note its location on the slope — folds concentrated at a rake or eave corroborate wind direction.

Sign 3: Tearing

What it looks like. Tears show up as shingles ripped around the nail line, partial shingles where a piece tore away, or fastener heads pulled through the shingle. Haag describes the shingle that "lifts and tears out around the nails" under uplift.

Why it matters. Tearing is often where installation defects show their hand. InterNACHI's guidance notes that improperly placed fasteners let "the wind pull the shingle over the heads of their fasteners," and that "high-nailing shingles drastically reduces the wind resistance of the roof." A torn shingle is genuine damage regardless of cause, but the tear pattern can tell an inspector whether wind alone or wind-plus-defect did it.

What to document. Photograph the torn area and, if visible, the fastener line. If you can see nails that have pulled through or shingles torn above the nail heads, capture that — it is relevant to how the loss happened.

Sign 4: Missing shingles (or portions of shingles)

What it looks like. The most obvious sign: bare spots where a shingle or tab is gone entirely, exposing underlayment or deck.

Why it matters. A missing shingle is unambiguous, but you still want to confirm wind as the cause rather than assume it. Missing shingles concentrated in the high-uplift zones, alongside creased and folded shingles nearby, and tied to a dated wind event, build the wind case. Look at the surrounding shingles too — the ones still present near a missing one are often creased or unsealed.

What to document. Photograph each bare area in wide context (showing where on the slope it sits) and close-up (showing the exposed underlayment or deck, and the condition of the neighboring shingles). If you find the displaced shingle in the yard or gutter, photograph it too.

Hidden wind damage you can't see from the ground

Some of the most consequential wind damage is invisible from a ladder or the lawn. Three categories to check.

Broken seals with no visible deformation. A shingle can be fully unsealed and still lie flat. From the ground, that roof looks fine. The only way to find a broken seal is to lift the tab. As the Lopez paper documents, on pliable shingles even genuine creasing can require "tactile manipulation" — hand pressure from underneath — to detect. A broken seal is not, by itself, wind damage (more on that in the next section), but it is a vulnerability, and where it coexists with creasing it confirms uplift occurred. Lift tabs across the high-uplift zones and note where the bond has released.

Subtle metal-panel damage. On metal roofs, wind damage can be quiet. InterNACHI's inspection guidance notes that loose or missing fasteners "will suffer reduced wind resistance and possible moisture intrusion" — and a fastener that has loosened can admit water while the panel still looks securely attached from the ground. Seams, "a weak point in the system," can also be compromised without an obvious panel failure. You will not catch either without a close look.

Interior and attic intrusion. Get into the attic. Inspectors check the attic deck, ceilings, and interior walls for water stains, damp or matted insulation, and mold — evidence of leaks "that might not be obvious from the outside." A fresh stain under a section of roof where you also found lifted or torn shingles is strong corroboration. Where access is limited, drone-based infrared thermography can map moisture saturation across a large roof by detecting temperature differentials, though that is a specialist tool, not a DIY step.

How to tell real wind damage from weathering or a shingle that's just unsealed

This is the section that separates a defensible claim from a denied one. Broken seals and detached shingles have many causes that are not wind, and adjusters and forensic engineers are trained to distinguish them. Here is how.

Multiple non-wind causes break seals. The Lopez paper is explicit: "There are multiple factors that negatively influence the adhesion of shingles. These factors include manufacturing inconsistencies, improper installation, aging and deterioration, installations during cold weather, contamination of the adhesive, as well as cyclic thermal expansion and contraction." Any of these can leave a shingle unsealed without a single gust of damaging wind.

The pattern test. This is the most useful single discriminator. Thermal cycling — the daily expansion and contraction of the roof — leaves a telltale signature. Per Lopez: "Cyclic thermal expansion and contraction, for example, will yield a pattern of unbonded shingle overlaps extending up-slope diagonally, reflecting the pattern in which these shingles were installed." Critically, that pattern "will not vary in direction or increase/decrease in areas of the roof where wind uplift would be greater/less." In plain terms: thermal-cycling unsealing follows the installation pattern uniformly across the roof, regardless of which parts catch more wind. Wind damage does the opposite — it concentrates where uplift is highest (eaves, rakes, ridges, corners) and leaves physical deformation. If the unsealing is a uniform diagonal pattern everywhere, that is thermal cycling, not wind.

The "zippering" misconception. You may hear a contractor call a line of detached shingles "zippering" and attribute it to wind. Haag's engineers flag this directly: zippering is commonly misattributed to wind but "actually results from cyclic expansion and contraction." Their reasoning is worth internalizing, because it is the cleanest logical test in the whole field:

"The mere presence of shingles that are detached from the roof's surface, but do not exhibit creasing, folding, or tearing is a great indicator that the roof has not experienced very high winds."

The logic: wind strong enough to break a seal is "most certainly strong enough to lift a shingle that is no longer sealed down" and crease or tear it. So if you find broken seals with no creasing, folding, or tearing anywhere, the wind that supposedly caused it would have left deformation — and the absence of deformation points away from wind.

One important caveat. A pre-existing unsealed roof is not immune to later wind damage — it is primed for it. Haag again: "While the partial detachment of the shingles is not initially caused by wind, once the detachment occurs, the shingles become more susceptible to becoming wind damaged." So a roof can have old thermal-cycling unsealing and fresh wind damage on top of it. You separate them the same way: the physical deformation (creases, folds, tears) concentrated in the high-uplift zones and tied to a dated storm is the wind signature; the bare unsealing is not.

Wind damage on tile and metal roofs

Asphalt is the most common roof and the best-documented, but the signs differ on other materials.

Concrete and clay tile

Forensic engineers at EDT describe wind damage to tile as "displaced tiles, missing tiles, and broken tiles from debris impact." As with asphalt, location is the tell: "The areas of a roof most susceptible to wind damage are located on the perimeter of the roof, the ridges, and the hips, where wind pressures are greatest." On the ridges and hips specifically, "high winds will lift the ridge and hip tiles and displace them, and not set the tiles back in their original locations" — so a ridge tile that is shifted, rotated, or out of alignment is a wind indicator.

There is one distinction that catches people on tile roofs, and it is important for an accurate claim: a broken tile is not automatically wind uplift. EDT is explicit that "broken tiles on the roof does not necessarily indicate evidence of wind uplift of tiles. Rather, in a high wind event, tiles are typically broken by impact from airborne debris." So broken tile may still be storm-related — debris driven by wind — but the damage mode is impact, not uplift, and documenting which it is matters. Look for displacement and missing tiles as the uplift signature, and treat breakage as a debris-impact question. Properly installed concrete and clay tile is engineered to withstand high winds, so wind-displaced or missing tile generally signals a significant event.

Metal panels and standing seam

Metal-roof wind damage is often subtle, and fasteners and seams are where to look:

• Fasteners. InterNACHI's metal-roof inspection guidance notes that thermal expansion and contraction, and movement of the substrate, "can cause through-fasteners to loosen or back out over time," and that "metal roofing with loose or missing fasteners will suffer reduced wind resistance and possible moisture intrusion." A fastener that has loosened or backed out is both a wind-resistance weakness and a water-entry point — check fastener rows closely for any that sit proud of the panel or look loose.
• Seams. Seams "are a weak point in the system," and whatever the seam type, it "should be undamaged and capable of preventing moisture intrusion." Watch for lifting, separation, or misalignment along seam lines. Much metal-roof wind damage does not announce itself: loosened fasteners and compromised seams can let water infiltrate while the panels still appear securely attached. Because the damage is at the fastener and seam level rather than dramatic panel loss, a close inspection of every fastener row and seam line — not just a scan for missing panels — is the job. Document each loosened fastener and compromised seam; that subtle damage is the claim, even when no panels are gone.

Putting it together: confirm the wind event and document the claim

Finding the damage is half of it. Tying it to a verifiable wind event and documenting it properly is what makes a claim stick. Work in this order.

Read the high-uplift zones first. Across every material, the highest uplift is at the perimeter, eaves, rakes, ridges, hips, and corners. Damage clustered there supports wind; damage spread uniformly across the field suggests age. Let the pattern guide where you look hardest.

Gather collateral evidence in the same session. Wind that damaged your roof usually left other marks. Photograph gutters and downspouts (dented, detached, or full of granules and shingle fragments), fences (blown sections, leaning panels), window screens (torn or popped out), and any debris field. These corroborate both that a wind event occurred and which direction it came from — and they are evidence an adjuster expects to see.

Pull the NOAA storm record. Go to the NOAA NCEI Storm Events Database and find the record for your loss date and location. It documents storm dates and recorded wind speeds, and it is the authoritative way to anchor your damage to a verifiable event. A claim that says "wind damage on [date]" backed by a NOAA record of high winds that day is far stronger than one without.

Photograph every damage mode two ways. For each instance of damage, take a close-up (showing the crease, fold, tear, or missing tab in detail) and a wide context shot (showing where on the slope it sits). For broken seals, lift the tab by hand and photograph the released bond — that documents damage that is otherwise invisible. Capture collateral damage in the same set.

Get a qualified inspection before permanent repairs. Have someone who knows the IIBEC and Haag criteria distinguish wind damage from weathering and unsealing — physical deformation present, damage concentrated in high-uplift zones, not a uniform diagonal up-slope pattern. Do not make permanent repairs before your adjuster inspects; temporary measures to prevent further damage, such as tarping, are appropriate and generally reimbursable.

What to do next, based on what you found

Use what your inspection turned up to decide your move.

If you found clear physical deformation (creases, folds, tears, or missing shingles) concentrated at the edges and corners, and a NOAA record confirms high winds on your loss date: you likely have a legitimate wind-damage claim. Document everything as described above, get a professional inspection to corroborate, and file with your insurer. Bring the NOAA record, the photo set, and the inspector's findings.

If you found only broken seals and unsealed shingles lying flat — no creasing, folding, or tearing — in a uniform pattern across the roof: this is most likely thermal-cycling unsealing or age, not a wind event. That does not mean your roof is fine; an unsealed roof is vulnerable to the next storm. But filing it as wind damage on its current evidence is unlikely to hold up. Consider having the seals professionally evaluated and the roof's remaining life assessed.

If you found a mix — old uniform unsealing plus fresh deformation in the high-uplift zones: the fresh deformation is your wind claim. Separate the two clearly in your documentation: photograph the creased, folded, and torn shingles in the edge zones as the wind damage, and let the inspector address the pre-existing unsealing separately. Because pre-existing unsealing makes a roof more susceptible to later wind damage, the two coexisting is a recognized scenario.

If you have a tile or metal roof: apply the material-specific signs. For tile, separate displacement and missing tiles (uplift) from breakage (likely debris impact). For metal, document every loosened or backed-out fastener and lifted or separated seam — the subtle fastener-level damage is the claim, even if no panels are missing.

If you are not confident reading the difference between wind damage and weathering, get a qualified inspector before you file. That distinction is exactly what determines whether a claim is paid or denied.

Red flags: mistakes and bad actors to avoid

A storm brings out contractors and shortcuts you should be wary of.

The storm chaser who finds damage on every roof. After a big wind event, crews canvass neighborhoods promising "free inspections" and then declare damage regardless of what is actually there. The tell: they call mere unsealing or normal weathering "wind damage" and push you to file immediately. Real wind damage means deformation. If someone shows you flat, unsealed shingles with no crease, fold, or tear and calls it a wind claim, they are either untrained or working an angle.

Reasoning from the wind rating instead of the roof. Be skeptical of anyone — contractor or adjuster — who argues from the printed shingle rating rather than the physical evidence. "These were 130 mph shingles, so it can't be wind" ignores that seals degrade and that lab ratings "do not directly correlate to wind speeds experienced in service." The condition of the seal and the presence of deformation decide the question, not the wrapper.

Calling "zippering" wind damage. As covered above, a clean line of detached-but-undeformed shingles is the signature of thermal cycling, not wind. A contractor who insists otherwise is misreading the roof — and a claim built on it is exposed to denial when a forensic engineer applies the Haag criteria.

Pressure to sign before a real inspection. Do not sign a contract or an assignment of benefits before someone has been on the roof and distinguished wind damage from weathering. The legitimate sequence is inspect, document, then decide.

Permanent repairs before the adjuster sees it. Repairing the roof before your insurer inspects removes the evidence. Tarp to prevent further water damage if you must, keep receipts, but leave the damage for the adjuster.

Frequently asked questions

What does wind damage on a roof actually look like?

On asphalt shingles, genuine wind damage shows up as creases, folds, tears, or missing shingles (or portions of shingles) — physical deformation, not just shingles that have come unsealed. It concentrates at the eaves, rakes, ridges, hips, and corners, where wind uplift is highest. On tile, look for displaced, rotated, or missing tiles; on metal, loosened or backed-out fasteners and lifted or separated seams.

Can wind damage a roof without anything looking obviously wrong?

Yes. A shingle can be fully unsealed and still lie flat, so the roof looks fine from the ground. Subtle creasing on a pliable shingle can require lifting the tab and feeling for the crease by hand. On metal roofs, loosened or backed-out fasteners can let water in while the panels still appear attached. This is why a close, hands-on inspection finds damage a ground-level look misses.

How can I tell wind damage from a roof that's just old or unsealed?

Look for two things: physical deformation and location. Wind damage leaves creases, folds, tears, or missing shingles, and it concentrates in the high-uplift zones. Age and thermal cycling leave a uniform diagonal pattern of unsealed shingles across the whole roof, regardless of where wind hits hardest, and without deformation. A flat, unsealed shingle with no crease or tear is not, on its own, wind damage.

What is "zippering," and is it wind damage?

"Zippering" describes a line of shingles that have come detached from the roof. It is commonly blamed on wind, but forensic engineers attribute it to cyclic thermal expansion and contraction. The logic: wind strong enough to break a seal would also crease or tear the shingle, so detached shingles with no creasing, folding, or tearing point away from wind as the cause.

At what wind speed does roof damage start?

There is no single clean threshold. Industry guidance suggests seals can begin to break and shingles lift in the rough range of 45 to 57 mph, that shingles can be creased or torn somewhere around 58 to 74 mph, and that hurricane-force winds of 75 mph and up cause widespread loss — but these bands are approximate, not confirmed primary standards. The reliable principle is that a shingle with a degraded seal fails at a far lower wind speed than its printed rating, so seal condition matters more than any fixed number.

Do I need to get on the roof to check for wind damage?

A thorough inspection requires getting onto the roof to lift tabs and check seals by hand and to look closely at fasteners and seams — much wind damage is invisible from the ground. If you are not comfortable or able to do that safely, have a licensed contractor or inspector do it. You can still spot obvious signs (missing shingles, displaced tile, debris) from the ground and in your attic.

How do I prove the damage came from wind and not something else?

Tie it to a verifiable event and document the pattern. Pull the NOAA NCEI Storm Events record for your loss date to confirm high winds occurred, photograph the deformation (creases, folds, tears, missing shingles) concentrated in the high-uplift zones, and capture collateral evidence — damaged gutters, fences, screens, and debris — that corroborates the event and its direction. Check the attic, too: a fresh interior water stain under a section where you found lifted or torn shingles is strong corroboration.

Is broken tile always wind damage?

Not necessarily. Forensic engineers note that broken tiles usually result from impact by airborne debris during a high-wind event, not from wind lifting the tile itself. The uplift signature on tile is displacement and missing tiles, especially at ridges, hips, and the perimeter. Broken tile may still be storm-related, but the damage mode is debris impact, which is worth documenting accurately.

What should I do before I call my insurance company?

Document first. Photograph every damage mode close-up and in context, lift tabs to record broken seals, capture collateral damage, and pull the NOAA storm record for your loss date. If you can, get a qualified inspection that distinguishes wind damage from weathering. Do not make permanent repairs before the adjuster inspects — tarping to prevent further damage is fine and usually reimbursable.

Can a roof that was already unsealed still get wind damage?

Yes — in fact it is more vulnerable. Forensic engineering guidance notes that once shingles are partially detached (from age or thermal cycling), they "become more susceptible to becoming wind damaged." A roof can carry old uniform unsealing and fresh wind deformation at the same time; the fresh creases, folds, and tears in the high-uplift zones are the wind-damage evidence, separate from the pre-existing unsealing.

Methodology note

This guide draws on primary engineering and standards sources rather than contractor marketing. The definition of genuine wind damage — creasing, folding, tearing, and missing shingles, versus mere unsealing — comes from the IIBEC technical paper by Lopez et al. (2017) and forensic engineering analysis from Haag Global. The seal-strip mechanism and the finding that progressive unsealing (not strength loss) drives failure come from IBHS and from peer-reviewed research in the Journal of Wind Engineering & Industrial Aerodynamics (2014 and 2023). Wind-rating standards (ASTM D3161, ASTM D7158, UL 580, UL 1897) and the critical caveat that laboratory ratings do not correlate to in-service wind speeds are sourced to NRCA's Mark Graham via Professional Roofing and to ASTM. Tile guidance comes from EDT Engineers; metal-roof and inspection-technique guidance from InterNACHI. Storm verification references the NOAA NCEI Storm Events Database.

Two points are flagged honestly. The graduated wind-speed bands (45–57 / 58–74 / 75+ mph) are presented as industry guidance, not established fact, because they could not be confirmed on a primary NWS or IBHS source; the well-supported principle is that seal condition, not a fixed speed, governs failure. And metal- and tile-roof sections lean more on trade and inspection-body sources than the Tier 1-dense asphalt section. Contractor blogs, roofer SEO content, and law-firm marketing pages were excluded as sources. Published May 2026.