Wind and Storm Damage Recognition

A Minnesota storm rolls through overnight, and the next morning a board member is standing in the parking lot looking up at the buildings, phone in hand, not sure what counts and what does not. A few shingles are in the grass. One roofline looks a little ragged. Is that new, or was it always like that? This page is built for that moment. It walks through what wind and hail actually do to the common roof and exterior materials on association property, how to tell fresh storm damage from ordinary age, and what a board should write down while the memory is clear.

What this page does, and what it does not do

This page helps your board recognize storm damage and document what you see. It does not advise you on insurance. TruPoint HOA Consulting does not tell you whether to file a claim, does not estimate claim value, and does not interpret policy or coverage language. Those decisions belong to your association, your insurer, and, where appropriate, licensed professionals such as a public adjuster or an attorney. Our role is to help your board see condition clearly and build a factual record of it.

We are also advisors, not code officials or engineers. Where a question turns on structural safety or code compliance, that goes to a licensed engineer or your building official, not to a roofing opinion.

Where storm damage tends to show up first

Wind does not hit a roof evenly. Research from the Insurance Institute for Business and Home Safety (IBHS) and post-storm assessments from FEMA point to the same pattern: uplift force is strongest at the corners of a roof, next along the perimeter (the eaves, the rake edges, the ridge), and weakest in the field, the broad middle of each slope. That is why the first shingles to lift, crease, or blow off are usually near a corner or an edge, not in the center of a slope where most people look.

Knowing this helps two ways. It tells your walk-through where to concentrate, and it helps separate real storm damage (concentrated at edges and corners, on the storm-facing sides of the buildings) from scattered wear that shows up evenly across an old roof.

What wind damage looks like

On steep-slope shingle roofs

• Creased tabs. A crease is a hard fold line across a shingle where wind lifted it and bent it back. It stays visible even after the shingle settles flat again. Industry research treats creasing, tearing, or a shingle detaching as the signs that confirm true wind damage.
• Lifted or unsealed shingles. Wind can break the factory seal that bonds one shingle course to the next. A word of caution here: a shingle that is unsealed but shows no crease or tear is not automatically wind damage. Shingles can fail to seal for reasons unrelated to a storm, including age and how they were installed. This is exactly the kind of judgment call that belongs to a qualified inspector, not a guess from the ground.
• Missing shingles. Full tabs or whole shingles gone, often with the ones downwind of them in the landscaping. Missing shingles expose the mat or the deck underneath and are an immediate water path.
• Exposed or backed-out fasteners. Nail heads showing, or shingles that have shifted enough to reveal the nail line.
• Granules in the gutters. Granules are the sand-like mineral coating on asphalt shingles. A sudden pile of them in gutters and at downspout outlets after a wind event is worth noting (some granule loss is normal over a roof's life, a fresh heavy deposit is not).
• Loose, bent, or displaced flashing. Flashing is the metal that seals the joints where a roof meets a wall, a chimney, a valley, or a vent. Wind can peel it back or lift its edges.
• Damaged ridge caps. The capping shingles along the peak sit in the highest-uplift zone and often go first.

On low-slope and flat roofs (breezeways, garages, mid-rise buildings)

Many associations have flat or low-slope sections covered by a single-ply membrane, a large rubber-like sheet such as TPO or EPDM, or by modified bitumen (an asphalt-based sheet good). Wind works on these like someone peeling a sticker off glass. Once an edge lifts, the roof can "unzip" quickly. Look for:

• Lifted membrane edges and curling or opened seams.
• New wrinkles, bubbles, or billowing areas that were not there before (fully-adhered systems tend to ripple, mechanically-attached systems tend to shift and flutter).
• Loose or missing edge metal along the perimeter.
• On ballasted roofs (the ones covered in loose gravel), displaced ballast and bare membrane showing through.
• Punctures or scrapes where wind dragged debris across the surface.

Damage here concentrates at corners, along the perimeter, and around rooftop units. One important quirk of flat roofs: water travels sideways under the membrane, so the leak that shows up on a ceiling inside may be several feet from where the membrane was actually breached.

On the rest of the building envelope

Wind also shows itself in fascia and soffit that have pulled loose, gutters and downspouts that are dented or detached (see the Gutters and Drainage page), bent roof vents, damaged fence sections, and siding that is cracked, loose, or missing. These are often easier to photograph from the ground than the roof itself, and they help establish that a real wind event hit the property.

What hail damage looks like, by material

Hail leaves different fingerprints on different materials, so the first question is always what the roof is made of. Here is what to look for on each.

Asphalt shingles

• Granule loss in circular or oval patterns. Hail knocks the protective granules off in rough circles, exposing the darker asphalt underneath. Those granules shield the asphalt from the sun, so once they are gone the shingle ages faster in that spot.
• Bruising. A bruise is a soft, spongy spot where the hailstone fractured the fiberglass mat (the structural layer) beneath the surface. It can look nearly intact from twenty feet away, and it feels soft under firm pressure, like a bruise on a piece of fruit. A bruised shingle deteriorates well ahead of an undamaged one.
• Cracked or split shingles. Larger stones, or older brittle shingles, can split outright, which is a direct water entry point.
• How to tell fresh from old. Fresh hail hits tend to have sharp, distinct edges. Ordinary aging wear has soft, feathered edges and spreads evenly across the whole roof rather than clustering.

In Minnesota, roughly one-inch hail (about quarter size) is the common "take it seriously" threshold on asphalt shingles. Much of what falls here is quarter-to-golf-ball size, which can leave real damage that only shows up on a close, roof-level look. (Our Hail Damage on Asphalt Shingles deep dive covers this material in full, including the hail-versus-normal-wear comparison and impact-rated shingle options.)

Metal roofing

On metal, the failure mode is usually cosmetic. Hail dents the panels, but because the panels sit tight against the roof deck they mostly keep shedding water even when dented. Softer metals (aluminum and copper) dent more easily than steel. The place to watch is the details: a functional problem on metal usually starts where hail strikes a seam, a ridge or hip cap, or a piece of trim or flashing, which can open a path for water. A useful side benefit of metal and other painted surfaces is spatter marks, spots where hail knocked off oxidation, dirt, or a thin paint film. Spatter helps confirm the direction the storm came from and that hail actually fell.

Composite and synthetic roofing

Synthetic slate and shake products are engineered to flex on impact, so they often take a hail hit as a surface mark without cracking through. Very large stones can still crack them, and each product line has its own tested impact behavior, so recognition here means checking the specific product against the manufacturer's guidance (see the Composite and Synthetic Roofing page).

Natural slate

Slate is hard but brittle. Hail damage shows as cracked or punctured tiles, often with a star-shaped fracture radiating out from the point of impact.

Wood shake and shingle

Wood is the most vulnerable of the common roof materials to hail. Damage shows as splits and cracks running along the grain, usually near the thin edges, along with broken corners and impact marks. One honest difficulty: a hail split can look a lot like a "foot-fall" split from someone having walked on the roof, so wood is a material where an experienced eye matters (see the Natural Slate and Wood Shake page).

Low-slope membrane

On flat roofs, hail shows as circular indentations, pockmarks, and small punctures in the membrane. On modified bitumen you may see granule displacement much like an asphalt shingle. Check the flashing, the edge metal, and the sealant around vents, pipes, and rooftop-unit curbs, all of which are easy for hail to crack or displace.

A useful distinction: functional versus cosmetic

Inspectors sort hail damage into two buckets. Functional damage reduces the roof's ability to shed water or shortens its expected service life (a fractured mat, a puncture, a cracked tile). Cosmetic damage changes appearance without changing performance (a dent in a metal panel that still keeps water out). This distinction is about the condition of the roof itself and what it means for how long the roof will last. It is not a statement about insurance, and TruPoint does not extend it into one.

Do not forget the inside

Some of the most important evidence is in the attic and top-floor ceilings, not on the roof. Fresh water stains on rafters or on the underside of the roof deck, damp or matted insulation, and new ceiling stains all point to water that has already found a way in. These interior signs sometimes appear before anything is obvious from outside, and they are safe to check without a ladder.

What a board should document (and only that)

The goal of documentation is a clear, factual record of condition, taken close to the event. Capture these:

• The storm date and, if you can, the wind direction. You can confirm that a storm actually occurred over your address, and its date, county, hail size, and estimated wind speed, using NOAA's free Storm Events Database, which is searchable by county and date. A printed record from that database is a clean, neutral way to establish that an event happened.
• Dated photos, wide and close. Wide shots that show which building and which elevation, then close-ups of each specific sign. Most phones stamp the date automatically, which is exactly what you want.
• Locations. Note the building or address, the slope or elevation (north, south, east, west), and the component (roof field, ridge, valley, flashing, gutter, siding, fence).
• Interior evidence. Photograph any attic or ceiling water signs, with the unit or common area noted.

A few guardrails. Stay off the roofs. Document from the ground, from windows, and with binoculars or a zoom lens, and leave roof-level inspection to a qualified professional with the right equipment. Keep the record factual, what you see, where, and when. Recording condition is the board's job. Judging what that condition is worth, or how it should be handled with an insurer, is not, and it is not ours either.

When to bring in a qualified professional

Call in a qualified roofing professional after any storm that brought roughly one-inch or larger hail or wind in the neighborhood of 50 miles per hour or higher, any time you can see damage from the ground, or any time you have interior water signs. A trained inspector does the thing a board should not try to do from the parking lot: get on the roof safely, and tell fresh storm damage apart from age, sun wear, foot traffic, and installation defects. Getting that call right early keeps a small, real problem from being missed and keeps a board from chasing damage that is not storm-related.

There is a quieter piece of timing that matters more than most boards expect. A baseline inspection before storm season, documented with photos, gives your association a dated record of the roof's condition on a clear day. When a storm does come through, that baseline is the honest before-and-after that makes the whole recognition process faster and less arguable. This is the evidence-based reason to act, and it is the opposite of a countdown clock. There is no rush being manufactured here, only a record worth having before you need it.

Take the next step

If a storm has already come through, download the Storm Damage Documentation Checklist and work it building by building while the details are fresh. If you want a dated record of where your roofs stand today, before the next system rolls in, request a baseline roof inspection. Not sure which fits your association? Use the question form and tell us what you are seeing, and we will point you to the right starting place.

Sources and further reading

• Insurance Institute for Business and Home Safety (IBHS), wind and hail research: ibhs.org (Opens in a new tab)
• National Roofing Contractors Association (NRCA), damage assessment guidance: nrca.net (Opens in a new tab)
• UL Solutions, UL 2218 impact-resistance standard: ul.com (Opens in a new tab)
• NOAA National Centers for Environmental Information, Storm Events Database (search a storm by county and date): ncei.noaa.gov/stormevents (Opens in a new tab)
• FEMA, storm damage assessment resources and hail data: fema.gov (Opens in a new tab)
• International Association of Certified Home Inspectors (InterNACHI), roof inspection references: nachi.org (Opens in a new tab)
• Haag Engineering, origin of the roof test-square inspection method (named for reference)
• University of Minnesota Extension, related Minnesota building-science topics such as ice dams and attic ventilation: extension.umn.edu (Opens in a new tab)