2.1 Causes of Loss / Named-Peril vs. Open-Peril

Causes of Loss: How Property Coverage Is Triggered

Every property policy answers one question before it pays a claim: was the cause of loss covered? In insurance, a peril is the actual cause of damage — fire, windstorm, theft, vandalism. A hazard is a condition that increases the chance or severity of a peril; hazards do not cause loss directly. Exam writers test the peril-versus-hazard distinction heavily, so anchor it early.

The coverage trigger depends on whether the policy uses a named-peril or an open-peril approach. This single choice controls who carries the burden of proof on every claim.

Named-Peril Coverage

A named-peril (also called specified-peril) policy lists each covered cause of loss. If a peril is not on the list, it is not covered — period. The insured carries the burden of proving that the loss was caused by a listed peril.

ISO standardizes named perils through its Causes of Loss forms in commercial property and through the numbered perils in the Dwelling and Homeowners programs. Key forms:

In the Homeowners program, HO-2 Broad Form and the HO-8 Modified Form are named-peril on both dwelling and contents.

Open-Peril Coverage

An open-peril policy (the modern term replacing the older “all-risk” label) covers every cause of loss except those specifically excluded. The advantage to the insured is broad protection and a reversed burden of proof: the insurer must prove an exclusion applies in order to deny a claim. Because of this, open-peril coverage commands a higher premium.

ISO open-peril forms include the CP 10 30 Special Causes of Loss form (commercial), HO-3 (open-peril on the dwelling, named-peril on contents), and HO-5 (open-peril on both dwelling and contents). The DP-3 Dwelling Special Form is the dwelling-program parallel.

Burden of Proof — the Tested Trap

• Named-peril: insured proves the loss came from a covered peril.
• Open-peril: insurer proves an exclusion to escape paying.

Exam items love this reversal. A common distractor states that the insurer always carries the burden of proof; that is true only for open-peril forms.

Standard Exclusions Across Forms

Certain causes of loss are excluded under essentially every property form because they are catastrophic, uninsurable in the standard market, or covered elsewhere:

• Ordinance or law (cost to comply with building codes)
• Earth movement (earthquake, landslide, sinkhole collapse)
• Flood and surface water
• War, nuclear hazard, and governmental action
• Wear and tear, deterioration, inherent vice
• Intentional acts by the insured

These appear in the Exclusions section and are frequently subject to the anti-concurrent causation language, which denies coverage when an excluded peril combines with a covered one to produce the loss.

Anti-Concurrent Causation and Ensuing Loss

Two clauses decide close cases. Anti-concurrent causation (ACC) language states that an excluded peril is excluded even if a covered peril contributes to the loss "in any sequence." So if wind-driven rain and flood both damage a building, the flood exclusion can bar the entire claim under ACC wording — a frequent post-hurricane dispute.

The ensuing-loss (resulting-loss) exception softens some exclusions: although a cause (such as faulty workmanship) is excluded, any ensuing covered peril it sets off is still covered. Example: defective wiring is excluded, but the resulting fire is covered, because fire is a covered ensuing peril.

Matching Perils to the Standard Forms

Memorize which programs use which approach, because the exam asks it directly:

Direct vs. Indirect Loss

A final distinction: a direct loss is physical damage to covered property from a covered peril (the burned building). An indirect (consequential) loss is the financial fallout that follows — lost rent, business income, extra expense, or spoilage. Indirect losses require their own coverage (business income, extra expense, spoilage endorsements); a standard property form covering only direct damage will not pay them. Exam distractors blur the two, claiming a basic fire policy automatically covers lost income; it does not unless time-element coverage is added.

Putting the Trigger to Work

In practice, the named-peril versus open-peril choice changes how an adjuster and an insured argue a claim. On a named-peril dwelling, the insured opens the file by identifying the listed peril and documenting that it caused the damage; if the proximate cause is not on the schedule, the file closes with a denial regardless of how severe the loss was. On an open-peril form the adjuster instead reviews the exclusions, and unless one clearly applies the claim is paid, which is why open-peril forms cost more and are marketed as premium products.

When you see an exam stem that gives a form name, immediately recall whether it is named or open peril and who therefore must prove what; that single recall resolves a large share of property questions. Remember too that contents and the dwelling can carry different approaches within the same policy, as the HO-3 demonstrates with open-peril structure but named-peril contents.