Reading Hail Damage on Ann Arbor's Commercial Roof Membranes
Severe thunderstorm hail is less frequent in Washtenaw County than in parts of the country further west and south, but it does occur, and hail damage on a low-slope commercial membrane is easy to miss from the ground. We inspect the roof, document what hail impact actually looks like on a flat roof, and produce a written scope. We're the roofing contractor documenting the damage, not the public adjuster negotiating the claim.
Why Hail Damage Is Hard to See on a Flat Roof
Hail damage on a pitched residential shingle roof leaves obvious bruising and granule loss visible from the street. A commercial low-slope membrane hides its hail damage better. Impacts show up as small punctures, cracked or bruised membrane at seams, dented metal flashing and coping, and damaged rooftop equipment housings, none of which are visible without walking the roof and inspecting closely.
What We Look For During a Hail Inspection
- Membrane bruising, cracking, or puncture at seams and field areas
- Dented or creased metal coping, edge flashing, and rooftop unit housings
- Damaged pitch pockets, pipe boots, and other roof penetrations
- Cracked or displaced skylight and vent covers
- Granule loss or coating damage on modified bitumen or coated systems
- Photo-dated records of impact density and pattern across the roof field
Impact Density and Why It Matters
A single hailstone strike rarely justifies a claim on its own. What matters to an adjuster is impact density, how many strikes per test area show membrane damage, since that pattern is what distinguishes a genuine hail event from isolated wear or mechanical damage from foot traffic or debris. We map impact locations across the full roof field so the documentation shows the actual pattern rather than a handful of cherry-picked examples.
Membrane Type Changes What Hail Damage Looks Like
Hail damage presents differently depending on the roof system. TPO and PVC single-ply membranes show cracking or fracturing at the impact point, sometimes not immediately visible until the membrane is flexed or probed. EPDM can show similar cracking, while metal coping and flashing dent visibly and are often the clearest evidence of a hail event even when the membrane itself shows only minor marking. We document according to the system actually installed, not a generic checklist.
Meeting the Adjuster on a Hail Claim
Hail claims are frequently where an adjuster and contractor see the roof differently, since membrane hail damage is subtle and easy to underestimate from a quick walkthrough. We walk the roof with the adjuster, point to specific impact locations, and explain the density pattern and why it's consistent with a hail event rather than another cause. We describe what we find and let the owner and adjuster work through the coverage decision from there.
Building Stock Around Ann Arbor
Newer TPO and PVC roofs common on tech-office and research-park buildings tend to show cleaner, more identifiable impact marks than older, more weathered systems downtown, where prior repairs and general wear can make isolating fresh hail damage from existing conditions more involved. We account for that context in every documentation package rather than treating every roof the same.
Hail Damage Found During Routine Maintenance
Not every hail claim starts with someone noticing a problem right after the storm. Buildings on our preventive maintenance program sometimes turn up hail impact evidence, cracked pitch pockets or dented coping, during a scheduled visit weeks or months after the actual storm date. When that happens we cross-reference the finding against known storm dates for the area and document it the same way we would a fresh report, since a delayed discovery doesn't make the underlying damage any less real.
What We're Not Doing
We're your roofing contractor, not a public adjuster or your advocate in a dispute with the insurer. We document and substantiate the hail damage so you and your adjuster work from an accurate, complete scope. We don't file the claim or promise a specific settlement.
Coating and Coated Roofs Need a Closer Look
Acrylic and silicone coated roofs around Ann Arbor add a wrinkle to hail documentation, since a coating can mask underlying membrane cracking that would otherwise be visible, or conversely show coating-only damage that doesn't reach the membrane beneath. We probe coated areas showing impact marks rather than taking the surface condition at face value, since the coating and the membrane underneath don't always fail together.
Hail Damage Roof Claim Questions We Hear
Can hail actually damage a flat commercial roof?
Yes. It's less visually obvious than on a pitched shingle roof, but hail can crack or puncture membrane, dent metal flashing and coping, and damage rooftop equipment.
How do you prove hail damage versus normal aging?
Through impact density and pattern. Hail damage shows a consistent strike pattern across the roof field tied to a specific storm date, while aging shows up unevenly at seams and known weak points over time.
Do you need a specific hail size to file a claim?
Coverage depends on the policy, not a specific hail size. We document the damage found; the insurer determines coverage against the policy language.
Should we wait to see if a leak develops before getting an inspection?
No. A cracked membrane that isn't actively leaking yet can still be a documented hail impact, and waiting risks the crack widening into a leak before it's on record.
What if the adjuster doesn't see the same damage we're pointing to?
We walk the specific locations with them and explain the technical basis for what we're calling hail impact. A disputed assessment is ultimately resolved between the owner and their insurer.