Wind & hurricane: coverage, deductibles, and mitigation
Wind is covered — but with a percentage deductible that can run six figures, and with flood carved out entirely. Here's how coverage works and how to harden a building against the storm.
Is wind and hurricane damage covered?
Windstorm — including hurricanes, tropical systems, tornadoes, and straight-line wind — is a covered peril on standard commercial property forms. But in wind-exposed regions it comes with a crucial catch: a separate percentage or named-storm deductible, calculated against your building's insured value rather than the size of the loss. And flood, including hurricane storm surge, is excluded — it must be insured separately.
In a hurricane, wind damage (covered) and storm-surge flooding (excluded) often occur together. The anti-concurrent causation clause governs how a claim is paid when both perils combine — it's the most litigated issue in coastal claims. Carrying separate flood coverage is what closes the gap.
The wind deductible: why the number bites
A percentage wind deductible is calculated against the insured value, not the loss. On a $5,000,000 building with a 5% named-storm deductible, you absorb the first $250,000 of storm damage before coverage responds. Owners routinely read "5%" as small and discover at claim time it's a six-figure retention.
- Named storm deductibles trigger only on officially named events; ordinary wind/hail then falls under the smaller flat deductible (better for the insured).
- All-wind percentage deductibles apply to any wind event.
Always convert the percentage to dollars before binding, and confirm the business could absorb it after a storm. A wind deductible buy-down is available by endorsement, subject to appetite.
How to reduce wind risk (and improve insurability)
Wind mitigation is well-established engineering — the FORTIFIED standard (from the Insurance Institute for Business & Home Safety) and FEMA guidance both center on the same principle: keep the building envelope intact so wind can't get inside and pressurize the structure. Once wind enters through a failed opening, internal pressure is what lifts roofs and collapses walls.
The highest-impact measures, roughly in order:
- Roof attachment and a sealed roof deck. Improved sheathing attachment (re-nailing to code), a sealed roof deck, and secured drip edges and vents — the roof is the first thing to fail and the most important to strengthen.
- Opening protection. Hurricane shutters or impact-rated glazing on windows and doors, so wind-borne debris can't breach an opening and pressurize the building.
- Roof geometry and cover. Roof shape affects wind loads; the cover and its attachment determine whether it stays on.
- Anchor and brace. Continuous load path from roof through walls to foundation; brace large interior fixtures; secure rooftop equipment.
- Site work before a storm. Remove or secure loose outdoor items, trim adjacent trees and branches, and protect glass and doors.
Wind-mitigation features — roof attachment, opening protection, roof geometry — materially lower premium and improve availability on the coast. A percentage deductible stacked with a coinsurance penalty can be devastating, so mitigation plus insurance-to-value discipline is the coastal playbook.
Building to the wind load: design speeds and risk categories
Modern wind-resistant construction starts with the design wind speed for the location — the code-specified speed used to calculate the pressures a building must withstand. In hurricane-prone regions these escalate sharply toward the coast: Florida's code, for example, sets design speeds that climb well past 170–180 mph in the southernmost and coastal zones. Buildings are also assigned an occupancy risk category (I–IV) based on use, with essential facilities like hospitals designed to the highest standard. A building engineered to the correct design speed and exposure category (ASCE 7 Exposure C or D in open or coastal terrain) is fundamentally more survivable — and underwriters know it.
Commercial-specific vulnerabilities
- Roof-mounted equipment. HVAC units, condensers, and ballasted equipment are a leading source of commercial wind loss — either torn loose to become debris or breaching the roof when they move. Mechanically anchoring rooftop equipment (not relying on ballast alone) is a high-value commercial measure.
- Wind-borne debris protection. In debris regions, glazing and openings should be rated for impact, and critical enclosures (including standby-power and generator enclosures for facilities that must stay operational) should meet the code's wind-load, rain-intrusion, and debris-impact test protocols.
- Low-slope and large-span roofs. Common in commercial buildings and especially exposed to uplift; membrane attachment, edge securement, and a sealed deck are decisive.
- Ballasted roofing systems. Where the membrane is held by stone or pavers rather than anchored — vulnerable in high wind and a specific focus of commercial resilience standards.
The wind & hurricane insurance playbook
- Convert every percentage deductible to dollars before binding.
- Carry separate flood coverage if there's any surge or flood exposure — wind coverage alone leaves the water side of a hurricane uninsured.
- Invest in wind mitigation and document it — FORTIFIED designations and roof/opening upgrades improve both risk and terms.
- Keep insurance-to-value current so a percentage deductible and coinsurance don't stack into a catastrophic gap.
- Have a preparedness plan — shutters installed, loose items secured, utilities and equipment protected before a storm.
Frequently asked questions
Wind damage from a hurricane is covered (subject to a separate wind or named-storm deductible), but flood and storm surge are excluded and must be insured separately. In a hurricane the two often combine, which is why separate flood coverage matters.
Against your building's insured value, not the loss amount. A 5% named-storm deductible on a $5M building is $250,000, applied before coverage responds. Always convert the percentage to dollars before binding.
Keeping the building envelope intact — a strong roof attachment/sealed roof deck plus opening protection (shutters or impact glass). Once wind breaches an opening, internal pressure is what lifts roofs, so protecting the roof and openings comes first.
A construction and re-roofing standard from the Insurance Institute for Business & Home Safety that strengthens a building against hurricane, hail, and high wind — focusing on roof attachment, sealed roof decks, and opening protection. FORTIFIED designations can improve insurability in wind-exposed markets.