What Is an Anti-Concurrent Causation Clause for Florida Property Insurance Claims?

An anti-concurrent causation (ACC) clause is a provision in property insurance policies in Florida that allows an insurer to deny an entire claim when an excluded peril contributes to the loss, even if a covered peril also caused damage.

These clauses typically state that the exclusion applies “regardless of any other cause or event contributing concurrently or in any sequence to the loss.” In practical terms, this means that if an excluded cause, such as flooding, plays any role in the damage, the insurer may attempt to deny coverage altogether, even if a covered cause, like wind, was the primary or dominant factor.

How Does an Insurer Use an Anti-Concurrent Causation Clause to Deny a Claim?

In Florida, insurers use an anti-concurrent causation (ACC) clause to deny claims by arguing that if any excluded peril contributed to the loss, the entire claim is barred, even if a covered peril also played a role.

An ACC clause typically states that the policy will not cover a loss caused “directly or indirectly” by an excluded peril, regardless of any other cause or event contributing concurrently or in any sequence to the loss. This language allows insurers to bypass traditional causation analysis and avoid paying claims involving multiple causes.

In practice, insurers apply the ACC clause by identifying an excluded cause, most commonly flooding, storm surge, or long-term wear and tear, and asserting that it contributed in some way to the overall damage. Once that connection is made, the insurer may take the position that the entire loss is excluded, even if wind or another covered peril caused substantial damage.

For example, after a hurricane, an insurer may argue that storm surge (excluded) and wind (covered) both contributed to the damage. By invoking the ACC clause, the insurer attempts to deny the claim in full rather than paying for the portion attributable to wind.

This approach is often challenged by policyholders who argue that covered damage can be separated from excluded damage. However, insurers typically resist these arguments and rely on the ACC clause to frame the loss as a single, indivisible event.

Whether the denial is valid depends on the specific policy language, the facts of the loss, and the quality of the causation evidence. In many cases, successfully contesting an ACC-based denial requires detailed documentation and expert analysis to challenge the insurer’s application of the clause.

How Does an Anti-Concurrent Causation Clause Work in a Hurricane Damage Claim in Florida?

Hurricane damage provides the most common context in which Florida insurers invoke ACC clauses. A standard Florida homeowners’ insurance policy covers windstorm damage but excludes damage from flooding, storm surge, and surface water. In a hurricane, these perils frequently affect the same property at or near the same time.

When an insurer invokes the ACC clause in a hurricane claim, the analysis typically unfolds as follows. The insurer assigns an adjuster to inspect the property and document the damage. The adjuster or a retained engineer produces a report that identifies storm surge, flooding, or rising water as a contributing cause of some portion of the damage.

The insurer then issues a denial letter citing the flood or storm surge exclusion and invoking the ACC clause to assert that, because an excluded peril contributed to the loss, regardless of whether wind or wind-driven rain was the primary cause, the entire claim is barred.

This approach has been used aggressively after every major Florida hurricane. It places the homeowner in the position of proving not merely that wind caused the damage, but that the excluded peril did not contribute to it in any sequence. This more difficult evidentiary burden requires engineering analysis, meteorological data, and expert testimony.

EXAMPLE: A hurricane makes landfall with sustained winds of 130 mph. Wind removes roof shingles and a section of fascia, allowing rain to enter the attic. Storm surge from the same storm reaches the base of the exterior walls but does not enter the home.

The insurer invokes the ACC clause, arguing that storm surge, an excluded peril, contributed to the overall loss, and denies the entire wind-and-rain damage claim. Whether that denial is legally defensible depends on the specific policy language, the physical evidence, and the policyholder’s causation analysis.

Are Anti-Concurrent Causation Clauses Enforceable Under Florida Law?

In Florida, anti-concurrent causation (ACC) clauses are generally enforceable when the policy language is clear and unambiguous, and the insurer can prove that an excluded peril contributed to the loss. Florida courts have upheld ACC-based denials in certain hurricane and storm-related cases where the evidence supported the insurer’s causation argument.

However, enforceability is not absolute. Courts have recognized important limitations that can impact whether an ACC clause will be upheld in a specific case.

What Is the Efficient Proximate Cause Doctrine, and Does It Affect ACC Clauses?

Florida courts recognize the efficient proximate cause doctrine, which focuses on the primary cause that sets the chain of events in motion. If that initiating cause is a covered peril, such as wind, a court may find coverage applies even if an excluded peril contributed later.

The interaction between this doctrine and ACC clauses is not fully settled in Florida, and outcomes can vary depending on the facts, the policy language, and the court.

Can Ambiguous Policy Language Make an ACC Clause Unenforceable?

Yes. If an ACC clause is ambiguous, inconsistent, or conflicts with other policy provisions, Florida law generally requires that the ambiguity be interpreted in favor of the policyholder.

Poorly drafted or internally conflicting policy language can weaken an insurer’s reliance on an ACC clause and support a challenge to the denial.

What Is the Difference Between Concurrent Causation and Anti-Concurrent Causation?

In Florida, these two concepts address what happens when multiple causes contribute to a property loss:

• Concurrent causation: If at least one cause of the loss is covered, the claim may still be paid even if an excluded peril also contributed.
• Anti-concurrent causation (ACC): The opposite rule. If any excluded peril contributes to the loss, the insurer can deny the entire claim, even if a covered peril was also involved.

Insurers include ACC clauses in policies specifically to override concurrent causation. Florida courts generally enforce ACC clauses when clearly written, meaning even minor involvement of an excluded peril can be used to deny an otherwise covered loss.

Hurricane and Tropical Storm Damage

Hurricane claims are by far the most common context for ACC clause denials in Florida. The combination of wind, wind-driven rain, storm surge, and flooding in a single event gives insurers multiple potential excluded perils to invoke.

After Hurricanes Irma, Ian, Idalia, and Helene, ACC clause denials accounted for a significant volume of coverage disputes throughout Florida. The wind-versus-water causation question, whether damage was caused by covered wind or by excluded storm surge and flooding, is the central factual issue in most hurricane-related ACC disputes.

Water Damage from Multiple Sources

In some water damage claims, both a covered water source and an excluded water source contribute to the same loss. A sudden pipe failure inside the home is typically a covered peril, while groundwater intrusion, seepage through foundation walls, and surface water entry are typically excluded.

If an insurer can identify any evidence of excluded water intrusion in the vicinity of a covered plumbing failure, it may invoke the ACC clause to deny the entire water damage claim. The key question is whether the excluded water source actually contributed to the specific damage or merely co-existed with it.

Foundation and Structural Damage

Foundation claims frequently involve both covered perils, sudden impact, structural collapse from a covered cause, and excluded perils such as earth movement, soil settlement, and subsidence. Florida homes built on expansive soils or near areas with unstable soil conditions are particularly susceptible to this type of multi-causation dispute.

An insurer that identifies any evidence of soil movement or settlement may invoke the ACC clause to deny structural damage that was actually caused by a sudden covered event.

Mold Claims Following Covered Water Losses

When mold develops following a covered water loss, insurers sometimes invoke the ACC clause by characterizing the mold as the product of long-term moisture accumulation—an excluded gradual condition rather than the result of the covered water event.

If the insurer can argue that mold existed before the covered loss or that gradual moisture intrusion contributed alongside the covered discharge, the ACC clause may be used to deny or limit mold remediation coverage even when the primary cause of the mold growth was the covered water loss.

What Evidence Does a Florida Homeowner Need to Challenge an ACC Clause Denial?

In Florida, challenging an anti-concurrent causation (ACC) denial requires clear evidence that a covered peril caused the specific damage, or that the insurer cannot prove an excluded peril contributed.

What Types of Evidence Are Most Important?

• Meteorological Data: Weather reports, storm tracking, and flood maps help show whether excluded perils, such as storm surge, actually impacted the property.
• Forensic Engineering Reports: An engineer can identify cause-specific damage patterns and determine whether wind (covered) or water (excluded) caused the loss. This is often the most critical evidence.
• Pre- and Post-Loss Photos: Photos and videos establish the property’s condition before and immediately after the event, helping isolate damage caused by the covered peril.
• Contractor Estimates: A licensed contractor can document the scope and value of damage and support which portions are tied to a covered cause.
• Insurance Policy Language: The exact ACC clause and endorsements control the dispute. Ambiguities or conflicts in the policy may support a challenge.

What Is the Biggest Mistake Homeowners Make?

The biggest mistake homeowners make in Florida property insurance claims is waiting too long to gather evidence.

Delays give insurance companies a strategic advantage. As time passes, damage conditions change, repairs may alter the property, and critical evidence disappears. Insurers then argue that:

• The damage worsened over time
• The cause of loss cannot be reliably determined
• A covered event did not cause the damage

Acting quickly preserves the evidence needed to prove your claim and protects your ability to recover the full value of your loss.

Does Citizens Property Insurance Use Anti-Concurrent Causation Clauses in Florida?

Yes. Citizens Property Insurance Corporation, Florida’s insurer of last resort, uses policy forms that include anti-concurrent causation (ACC) clause language. These provisions apply to excluded perils such as flooding, storm surge, and earth movement.

Citizens’ policies have been heavily litigated after major hurricanes, and Florida courts have generally upheld ACC clauses when the insurer can prove that an excluded peril contributed to the loss. However, each case depends on the specific facts and the exact wording of the policy.

It is important to understand that Citizens’ policies are not identical to private insurance policies. They may differ in how exclusions are written, how ACC clauses are structured, what endorsements are available, and what dispute-resolution options exist.

In Florida, a property insurance attorney challenges an anti-concurrent causation (ACC) denial by combining policy analysis with strong evidence. The process begins with a careful review of the insurance policy to determine whether the ACC clause is clearly written or contains ambiguities that can be interpreted in the homeowner’s favor.

The attorney then builds an independent evidentiary record, often using forensic engineering reports, weather data, and contractor estimates to prove that a covered peril, such as wind, caused the damage. This evidence is submitted to the insurer in a formal demand challenging the denial.

If the insurer still refuses to pay, the attorney may file a Civil Remedy Notice under Florida Statute 624.155, giving the insurer 60 days to resolve the claim. If the issue remains unresolved, the case can proceed to litigation, where expert analysis and detailed investigation are used to challenge the denial and pursue full compensation.

Williams Law Association, P.A. has handled ACC disputes across these levels of complexity for more than 30 years.

What Should a Florida Homeowner Do Immediately After Receiving an ACC Clause Denial?

Preserve all damage and avoid permanent repairs until an inspection is completed. Obtain a complete copy of your policy, including endorsements. Do not give statements or accept any settlement before understanding your rights. Most importantly, consult an attorney to evaluate whether the denial is legally valid.

Before responding to the insurance company, giving a recorded statement, or accepting any payment, consult a Florida property insurance attorney.  Our expert property insurance attorneys can quickly evaluate whether the denial is legally valid, identify weaknesses in the insurer’s position, and advise you on the best path forward.

An ACC denial does not mean your claim is over. It means the insurer has taken a position that must be tested against the policy language, the evidence, and how Florida law applies to your specific loss.

Get Help with an ACC Clause Denial in Florida

Williams Law Association, P.A. is a Tampa, Florida, property insurance law firm that has represented Florida homeowners and commercial property owners in ACC clause disputes, hurricane damage claims, and bad faith insurance cases for more than 30 years. All property insurance claims are handled on a contingency-fee basis, with no upfront cost to the homeowner.

If your claim has been denied based on an anti-concurrent causation clause or if your insurer is using wind-versus-water arguments to reduce or deny your recovery, you should not accept that decision without a legal review. These denials are often based on contested causation issues that can be challenged with the right evidence and strategy.

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