North Carolina Anti-Concurrent-Causation Clause: What It Does and What It Doesn't

In this guide

• What the anti-concurrent-causation clause actually says in a typical NC policy
• Six things the ACC clause does — and what each one means in practice
• Six things the ACC clause doesn't do — and why those limits matter
• How NC's § 75-1.1 framework may apply when carriers stretch the clause
• How Property People Law approaches NC ACC disputes

Key takeaways

• The ACC clause is policy language that generally provides: when an excluded peril contributes to a loss in any sequence, the entire loss may be excluded regardless of any other contributing cause. NC carriers use it heavily in Helene denials.
• The clause has specific structure and specific limits. It generally applies only when the excluded peril actually contributed to the specific damage — not to every piece of damage that happened during the same storm event.
• ACC clause language varies across NC carriers. Some clauses are written broadly; others are narrower. The specific language in your policy controls the analysis.
• When carriers stretch the clause beyond its actual reach, the conduct may push toward NC's § 75-1.1 unfair-trade-practices framework and the common-law bad-faith claim.
• At Property People Law, we read NC ACC clauses and identify where the carrier's argument exceeds what the clause actually supports. Our initial review is free; our NC residential and commercial property damage work is generally on contingency — we only get paid from the recovery, not your pocket.

North Carolina has spent the last 18 months working through Hurricane Helene insurance disputes, and the anti-concurrent-causation clause has been at the center of most of them. Carriers have cited the clause in Helene denials at scale — sometimes for damage where the clause genuinely applies, sometimes for damage where it doesn't. Understanding what the clause actually does and what it doesn't do is the foundation for evaluating any NC denial that cites it.

The clause is short — typically a few sentences embedded in the exclusions section of the policy. But its impact on coverage is large because it allows the carrier to deny entire claims when only part of the loss involves an excluded peril. The argument is structural: if flood contributed at all, in any sequence, the whole claim is excluded. Understanding the structure of that argument — and the structural limits courts and regulators have recognized — is what determines whether a particular ACC denial holds up.

This article walks through what the clause actually says in a typical NC policy, six things the clause does, six things the clause doesn't do, how the § 75-1.1 framework may apply when carriers stretch the clause, and how we at Property People Law approach NC ACC disputes. Every policy is different, every claim turns on its own facts.

What the ACC clause actually says in a typical NC policy

Most NC homeowners policies contain ACC language broadly similar to: "We do not insure for loss caused directly or indirectly by any of the following [excluded perils]. Such loss is excluded regardless of any other cause or event contributing concurrently or in any sequence to the loss."

Three structural features matter. First, the clause modifies coverage exclusions — it operates within the exclusions section, not as a stand-alone coverage grant or denial. Second, the clause speaks to contribution "concurrently or in any sequence," which is the language carriers cite for the proposition that timing is irrelevant. Third, the clause applies to specific named perils in the policy's exclusions list — typically flood, earth movement, war, nuclear hazard, and others — not to coverage generally.

Specific language varies meaningfully across NC carriers. Some ACC clauses are unusually broad; some are narrower or only apply to specific excluded perils. The general framework is consistent, but the specific words in your policy decide individual cases.

Six things the ACC clause does

• Allows the carrier to deny loss caused by an excluded peril even when a covered peril also contributed. If wind and flood combined to cause specific damage, the ACC clause may allow denial of that combined-cause damage. This is the clause's core function and the reason carriers cite it.
• Operates regardless of the order of perils. The clause's "in any sequence" language means the carrier can argue ACC whether the excluded peril came first or second. Helene-era denials cite this language to argue that even where wind came first, ACC still applies if flood eventually contributed.
• Allows characterization of mixed-cause damage as falling inside the excluded peril. Damage that has multiple contributing causes — wind, flood, debris impact, wind-driven rain — may be characterized as flood under ACC when flood was one of the contributing causes. The clause is the mechanism for this characterization.
• Applies to consequential damage that flows from the mixed-cause event. Some carriers extend ACC to mold growth, contents damage, and additional living expenses when the underlying event involved excluded perils. Whether the extension actually holds up depends on whether the consequential damage flows from a covered cause or from the excluded cause.
• Modifies the wind-driven rain coverage in some cases. Many NC policies cover interior damage from wind-driven rain through wind-created openings. Carriers sometimes argue ACC modifies this coverage when separate flooding occurred during the same event. The argument has real limits, but it gets made.
• Shifts the practical burden of proof. Although the carrier generally has the legal burden of proving an exclusion applies, the ACC clause in practice often forces the property owner to develop affirmative evidence that the damage was caused by a covered peril independent of any excluded peril contribution. The clause changes how cases are litigated.

Six things the ACC clause doesn't do

• Doesn't exclude pure covered-peril damage that occurred in isolation. Damage caused solely by a covered peril, before any excluded peril contributed, may not fall inside the clause. Wind damage to a roof that occurred hours before any flooding arrived was caused solely by wind — flood didn't contribute to that specific damage. The clause requires actual contribution by the excluded peril, not just temporal coincidence.
• Doesn't override coverage grants for losses with separate covered causes. Wind-driven rain through wind-created openings is a separate covered peril analysis. The interior damage from rain entering through a wind-damaged roof opening generally remains covered as wind-driven rain — even when separate flooding occurred elsewhere on the property. The chain of covered causation stands on its own.
• Doesn't reach damage physically above the flood line. Surge, river flooding, and groundwater inundation generally have a physical maximum height — what they reached. Damage to upper stories, attics, or roof structures above that height was not caused by flooding regardless of what happened below. The ACC clause doesn't extend coverage analysis to damage the excluded peril couldn't physically have caused.
• Doesn't make ambiguous policy language clear. Where ACC language or the underlying exclusion language is ambiguous, NC courts have generally construed ambiguity against the carrier as the drafter of the policy. The clause doesn't get a pro-carrier construction simply because it appears in the policy. The standard of construction applies the same way it would to any other policy provision.
• Doesn't relieve the carrier of its burden to prove the exclusion applies. NC law generally puts the burden of proving exclusions on the insurer. The ACC clause is part of the exclusions framework, and the carrier generally has to prove that the excluded peril actually contributed to the specific damage — not that flooding occurred somewhere on the property generally.
• Doesn't protect the carrier from § 58-63-15 or § 75-1.1 review. When the carrier applies the ACC clause without a reasonable investigation, applies it to damage clearly outside its reach, or uses it as cover for refusing to engage with documented covered causes, the conduct itself may move into the regulatory and unfair-trade-practices framework. ACC isn't a shield against bad-faith analysis when the application of the clause is itself unfair.

How NC's § 75-1.1 framework may apply when carriers stretch the clause

Most ACC denials are contract disputes. The carrier took a position; whether the position holds up depends on the evidence and the policy language. That's an ordinary breach-of-contract analysis.

Where the analysis may push into NC's unfair-trade-practices framework is when the carrier's ACC application is so aggressive that no reasonable reading of the clause supports it. Applying ACC to damage that physically occurred before the excluded peril arrived. Applying ACC to second-floor damage when the flooding only reached the first floor. Applying ACC to wind-driven rain through wind-created openings without analysis of whether the chain of causation actually involved the excluded peril. Refusing to investigate timing evidence or to share engineering reports that support a wind-first analysis.

The November 2024 NC Insurance Commissioner bulletin warning carriers against penalizing policyholders who pursued NFIP denial letters as part of coverage disputes adds a regulatory backdrop. Carriers whose conduct after the bulletin continued patterns the bulletin called out may face stronger inferences of unfair handling. Whether § 75-1.1's treble damages framework or NC's common-law bad-faith claim applies in a specific case depends on the carrier's actual conduct and what the record shows.

See our NC bad-faith pillar for the broader framework. The specific intersection of ACC application and § 75-1.1 analysis is where most NC Helene-era cases that move beyond contract dispute end up.

How Property People Law approaches NC ACC disputes

When a NC property owner reaches out about an ACC-based denial, the first conversation is free and the framework is consistent. We read the specific ACC clause in your policy — language varies, and the specific words matter. We map the damage on your property against the ACC contribution requirement. We identify pure covered-peril damage that occurred before any excluded peril contributed. We identify wind-driven rain damage from openings the wind created. We identify damage above the flood line. We compare the carrier's ACC argument against the actual physical and timeline evidence.

From there we tell you what survives the ACC denial, what evidence is needed to establish the position, and whether the carrier's application of ACC may itself support a § 75-1.1 or common-law bad-faith argument. Some ACC denials are defensible. Many aren't. The first review tells you which one you're holding.

Our NC residential and commercial property damage work is generally on contingency — we only get paid from the recovery, not your pocket. Past results in other cases don't guarantee outcomes in any new matter, and every claim turns on its own facts.