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

What Triggers Property Coverage?

Every property policy pays only when a covered cause of loss (peril) damages covered property at a covered location during the policy period. The exam tests how the trigger is described and where the burden of proof falls. Two structures dominate the market: named-peril and open-peril (also called "all-risk" or "special" form). Knowing which structure a form uses, and who must prove what, answers roughly one question in five on the property side.

Named-Peril Coverage

A named-peril form lists each covered peril. If the peril is not on the list, there is no coverage, even if the loss was sudden and accidental. The classic personal-lines example is the ISO Dwelling Basic Form (DP-00-01) and the basic/broad coverage in homeowners forms.

• Basic perils (DP-1 / HO basic): fire, lightning, internal explosion; the standard Extended Coverage (EC) group adds windstorm/hail, explosion, riot/civil commotion, aircraft, vehicles, smoke, plus volcanic eruption; V&MM (vandalism & malicious mischief) is added separately.
• Broad perils (DP-2 / HO broad, Coverage C contents): the basic/EC list plus falling objects; weight of ice, snow, or sleet; accidental water/steam discharge; freezing; artificially generated electrical current; and building collapse.

Under named-peril, the insured bears the burden of proof: the claimant must show the loss was caused by a listed peril.

Open-Peril Coverage

An open-peril (special) form covers all direct physical loss except what is specifically excluded. The ISO DP-00-03 (DP-3) dwelling special form and the HO-3 / HO-5 homeowners forms use open-peril on the building (HO-5 extends it to contents).

Here the burden flips: the insurer must prove an exclusion applies to deny the claim. Because the carrier shoulders the proof, open-peril forms cost more and are considered the broadest first-party protection short of a manuscript policy.

Burden-of-Proof Comparison

Common Traps

• Trap: Students assume open-peril = "covers everything." It does not — flood, earth movement, war, nuclear hazard, ordinance or law, wear and tear, and intentional acts are still excluded. "Open" means open except the named exclusions.
• Trap: HO-3 is open-peril on the dwelling (Cov A/B) but named-peril on contents (Cov C). Only HO-5 makes contents open-peril. Watch the answer choices that flip this.
• Trap: Theft is excluded under the basic dwelling forms; you generally need a broad/special form or the homeowners program for theft of contents.
• Trap: A "sudden and accidental" loss from an excluded peril is still not covered — suddenness does not override an exclusion.

Proximate Cause and Concurrent Causation

When multiple perils combine, the proximate cause — the dominant, unbroken cause that set the chain in motion — controls coverage. ISO forms add anti-concurrent-causation (ACC) language to flood and earth-movement exclusions so that if an excluded peril contributes in any sequence to the loss, the entire loss is excluded. ACC wording is the reason a wind-vs-flood dispute after a hurricane turns on which peril the adjuster can prove.

How Forms Step Up in Breadth

Think of the ISO menu as a ladder. The DP-1 / HO-1 basic rung covers the fire-lightning-EC core. The DP-2 / HO-2 broad rung adds the falling-objects, weight-of-ice, water-discharge, and collapse group — still named-peril, but a longer list. The top rung, DP-3 / HO-3 special, abandons the list approach on the building and simply covers everything not excluded. Each step up trades premium for breadth and shifts more proof onto the carrier.

The distinction matters because adjusters and producers must set client expectations. A homeowner who buys an HO-2 to save premium and later suffers a sewer backup or a slowly leaking pipe may find the loss limited or excluded, whereas the same event under an HO-3 with an endorsement is far more likely to respond.

Direct vs. Indirect (Consequential) Loss

Property coverage is divided into direct loss — physical damage to the covered property itself — and indirect (consequential) loss, the financial fallout that follows. Additional living expense (Coverage D / Fair Rental Value in dwelling forms) and business income in commercial forms are indirect coverages: they pay only because a covered direct peril first made the property unusable. The exam often pairs a direct-loss fact pattern with a consequential-loss answer choice to test whether you can separate the two.

Coverage Triggers and the Policy Period

A first-party property policy is occurrence-triggered: the covered peril must strike during the policy period, regardless of when the claim is reported. This contrasts with the claims-made trigger used in some liability forms. Damage that begins before inception (pre-existing) or that is purely gradual (wear, deterioration, latent defect) is not a covered "sudden and accidental" trigger, which is why progressive water seepage is one of the most litigated coverage questions in property claims.