Hail Damage and the Roof Insurance Claim: What Gets Paid and What Does Not

A hailstorm rolls through, somebody walks the roof, and the phone calls start. The owner wants a new roof. The contractor sees fractures. The adjuster sees a fifteen-year-old membrane with ponding and open laps. Six months later there is an engineering report on the file and everybody is arguing over a hundred square feet of test area.

Most of these disputes get decided by two things: whether the damage is functional or cosmetic, and what the policy says about valuation, deductibles, and roof age.

What hail does to a low-slope roof

Start with the definition the industry uses. Functional damage reduces the roof's ability to shed water or shortens its expected service life. Anything else is cosmetic. That line is the whole fight.

Single-ply (TPO, PVC, EPDM). Hail fractures the membrane at impact, usually as a circular or star-shaped break in the top ply. The important finding from severe hail testing is where those failures happen: in one IIBEC study of low-slope assemblies impacted with 2.0-inch freezer ice balls, 81 percent of failures occurred directly over fasteners and metal plates. Membrane over a hard point has nowhere to go. That study also found EPDM performed best of the single-plies tested, 80-mil TPO outperformed thinner TPO, and PVC performed worst on a small sample.

Modified bitumen and BUR. More mass, more plies, and in that testing they tended to fail in the field only after a second impact in the same place. Damage shows up as fracture of the reinforcement, a bruise you can feel by hand, and granule displacement that exposes bitumen. Freshly exposed bitumen is shiny black and weathers to gray, which is one way an experienced inspector dates a strike.

Metal. Panels dent, and dents are where the cosmetic argument gets made hardest. The functional questions on metal are at the seams, the fasteners, and the coating, not in the middle of a flat pan.

What is underneath matters more than what is on top. The same testing found assemblies over higher-density gypsum board substantially outperformed assemblies over lower-density polyisocyanurate. More important for claims: damage to the substrate and fastener plates can occur with no visible damage to the cover at all. Torn facers and broken polyiso cores under an intact membrane will not show up in a walk-and-photograph inspection, and they degrade uplift resistance whether anyone finds them or not.

How the damage gets assessed

The test square method is the standard, and it is older than most of the membranes it gets used on. Mark a 10-foot by 10-foot square, avoid overhanging trees and heavy foot-traffic paths, examine everything inside it closely, and record what you find. On membrane roofs the count is not damaged units but hail-caused fractures, punctures, and ruptured areas.

A few procedural details that get skipped and then argued about later:

• One test area per directional slope or elevation. Wind-driven hail arrives at an angle, and one face can be hammered while another is clean.
• More test areas wherever the covering type or age changes, and one for each 50 squares of roof area on large roofs.
• Collateral evidence first. Soft metals, gutters, vents, HVAC coil fins, and fences establish that hail fell, how big, how hard, and from what direction.
• Core cuts and a moisture survey. Infrared or a nuclear survey plus verified cores is often the only way to show wet insulation and hidden substrate damage.

Repair versus replace has a documented method too: a cost formula weighing damaged units per square, unit repair cost, a difficulty factor of 1, 1.5, or 2 for good, fair, and poor condition, and slope area. Worth knowing it exists, because "the roof is old so it all has to go" is not its conclusion.

Three different opinions, three different weights

A contractor's estimate is a price to do work, not a cause-of-loss determination, and adjusters discount it because the contractor gets paid.

An adjuster's finding is the carrier's opening position, and adjusters vary widely in low-slope experience. Many have seen far more shingle roofs than 60-mil TPO.

An engineering report, usually retained by the carrier once the number gets large, becomes the record. If the first real technical document on the file is the carrier's engineer, the claim is being argued on their evidence. Getting independent observations in early, with dates, locations, test square counts, and cores, is what changes outcomes.

The policy terms that decide the money

Replacement cost versus actual cash value. RCV pays to repair or replace without deducting depreciation. ACV pays the depreciated cost. Idaho's Department of Insurance illustrates it with two identical neighbors: a $15,000 roof, $1,000 deductible, ten years old. The RCV policyholder nets $14,000. The ACV policyholder, on $1,000 per year of depreciation, nets $4,000. A policy can be RCV on the building and ACV on the roof, and increasingly that is how they are written.

Roof age schedules. Carriers increasingly pay the roof portion of a wind or hail loss off a published schedule tied to age rather than at replacement cost. Allstate moved first with a scheduled roof depreciation option and other carriers in hail-exposed states followed. The schedule is given to you at binding and usually applies only to wind and hail losses.

Percentage deductibles. Wind and hail deductibles are commonly written as a percentage of insured value rather than a flat dollar amount, typically 1 to 5 percent. On a $6 million building, a 2 percent wind and hail deductible is $120,000. That kills a legitimate claim that would have paid easily under a $10,000 flat deductible, and plenty of owners do not know which one they have until they file.

Cosmetic damage exclusions. Real, approved, and usually traded for a premium credit. Texas adopted an endorsement excluding cosmetic hail damage to roof coverings for risks receiving premium credits for impact-resistant coverings meeting UL 2218, void unless the insured signed it. Check your declarations page for that endorsement before assuming dents are covered.

Late reporting. Policies require prompt notice, and hail damage frequently is not found for months. Idaho's Unfair Claim Settlement Practices statute requires an insurer to act reasonably promptly on claim communications and to affirm or deny coverage within a reasonable time after proof of loss is completed. It does not excuse a late notice. The state's guidance is blunt: report as soon as you know there is damage. The notice requirement and the suit limitation period live in the policy, and they vary.

Why a worn-out roof usually loses

Every property policy excludes wear, tear, and deterioration. When a roof was already failing, the carrier does not have to prove the hail did nothing. It only has to argue that what you are looking at is age.

That case is easier to make than it should be, because weathering mimics hail. Granule flaking on an old cap sheet leaves gray, weathered exposed bitumen. Blisters weather away into pits with steep sides. Foot traffic marring pushes up a ridge of bitumen and granules around the edge of the mark, which hail impact does not do. Faked hammer damage clusters in the middle of the roof, comes in uniform size, and is not randomly distributed the way real hail is. A competent inspector tells these apart. An owner with no records cannot argue about it.

An undocumented roof at year eighteen of a twenty-year life gets depreciated hard or denied, and the argument is not really about the storm.

Before and after the storm

Before:

• A dated baseline condition report with photographs, ideally annually, and always at acquisition or a change in management.
• Core cut records and a moisture survey on file, so the pre-storm moisture state is known.
• The roof's real specification: membrane type and thickness, attachment method, cover board and insulation type, installation date.
• Documented maintenance, with dates and invoices.
• Current declarations, checked for the wind and hail deductible, the roof valuation basis, any roof age schedule, and any cosmetic damage exclusion.

After:

• Notify the carrier promptly, in writing, even before you know the extent.
• Mitigate and keep the receipts. Do not make permanent repairs before the carrier has looked.
• Get the storm on record. NWS reports and hail size data for that date and location establish that hail capable of causing damage fell there.
• Document with test areas, not a walking tour. Marked squares, counts, locations on a roof plan, cores.
• Ask for every denial or partial denial in writing.

Impact-resistant assemblies and what the ratings mean

Two rating systems matter, and they are not the same test. UL 2218 drops a 2-inch steel ball from 20 feet, twice in the same spot, and a Class 4 covering has to show no cracking or rupture. FM's classifications use a 2-inch steel ball for moderate hail (81-inch drop, roughly 8 ft-lb) and severe hail (141.5-inch drop, roughly 14 ft-lb), and for very severe hail it fires 2-inch preformed ice balls at 152 to 160 feet per second for 53 to 58 ft-lb. Ice shatters and spreads the load differently than steel, so the ice ball tests are the harder and generally the more realistic ones.

What the ratings promise is narrow. They describe one assembly, tested new, in a lab. They do not promise a hail-proof roof and they do not settle a claim. The IIBEC testing is the reality check: under 2.0-inch freezer ice balls, only 46 percent of samples passed at Class 4 impact energies and 17 percent at Class 5.

The rating earns its keep in the assembly: high-density cover board rather than membrane directly over polyiso, fully adhered attachment rather than mechanically fastened (which removes the fastener-plate failure mode entirely), and heavier membrane. Premium credits for impact-resistant coverings are real in some states, and so is the trade. The credit sometimes comes attached to the cosmetic damage exclusion.

The Idaho picture

Idaho gets hail every year and it is not the plains. In 2025 the Storm Prediction Center logged 5,432 hail events nationally, led by Texas (902), Kansas (375), Oklahoma (369), Nebraska (315), and Missouri (253). Idaho is not in that conversation, and by the published summaries of FM's hail zoning it sits outside the very severe hail region, which runs the plains from Texas through the Dakotas plus parts of the surrounding states. FM Data Sheet 1-34 itself is not public, so check the current map with your carrier or consultant before designing to it.

The state hazard mitigation plan describes Idaho as having relatively low potential for significant hail events, with hail falling somewhere in the state every year but typically minor. The exceptions are on the record: golf ball hail in Bonneville County in June 1996, and about $1 million in property damage from an August 1997 Bannock County storm.

That profile has consequences here. Idaho roofs are rarely specified for severe hail, so when a real cell hits, what is under the membrane is usually mechanically fastened single-ply over polyiso, the configuration that fails over fasteners. Local adjusters handle fewer hail claims than their counterparts in Kansas, and out-of-state storm chasers show up fast after any event that makes the news.

If you hit a wall with a carrier, Idaho's Department of Insurance Consumer Affairs is free, at (208) 334-4250 or (800) 721-3272, and complaints can be filed online. It is an unbiased resource for disputes with insurers and agents, not a claims court, and it expects you to have tried your carrier first. If the dispute is over the amount of loss rather than whether it is covered, most policies contain an appraisal clause. Appraisal sets cost only, not coverage, it is not a court proceeding, and you pay part of the cost. Where the policy has that clause, you generally have to go through it before you can sue.

One honest note

VG3 Consulting is not a roofing contractor, a public adjuster, an insurance agent, or a law firm, and nothing here predicts any particular claim. Your policy language and Idaho law govern your loss, and two buildings with identical damage can settle very differently because of a deductible basis or an endorsement nobody read. Read your own policy, and talk to your carrier or a licensed professional about your situation. What we do is the technical side: knowing what the assembly is, what the damage is, and documenting it well enough that the conversation is about facts.