Why your policy excludes flood, and what the exclusions are actually doing there

An exclusion looks like a refusal and functions as a boundary. Insurance works by collecting from many and paying a few, which requires that the events being covered are random with respect to each other.

A peril that damages every insured property in a county on the same afternoon breaks that arithmetic, and a policy that promised to cover it at ordinary rates would not survive the first bad year.

That single idea explains most of what is in the exclusions section, and it explains why the fix for each gap is a different product rather than an argument.

The three families of exclusion

Correlated catastrophe. Flood, earthquake, war, and in some regions wind. All of them hit everyone at once. These are excluded from standard property policies and provided separately, through a specialized policy, an endorsement, or a state program.

Maintenance and wear. Deterioration, rust, settling, gradual seepage, insect and rodent damage. These are excluded because they are certain rather than uncertain. Every roof reaches the end of its life. Insuring an event that will definitely happen is not insurance, it is a savings plan with an administrator taking a cut.

Moral hazard and known risk. Intentional loss, and property already damaged when the policy was written. Straightforward, and rarely disputed by anyone acting in good faith.

Water, which is where most disputes live

Water is the peril most likely to produce a coverage argument, because a homeowner experiences one thing, a wet floor, while the policy distinguishes sharply between several causes with different answers.

Flood coverage in the United States is available largely through a federal program administered by FEMA, alongside a private market that has grown in recent years. The important practical point is that a flood policy is a separate purchase with its own waiting period before it takes effect, which means buying one during a forecast is not a plan.

The clause that surprises people

Many policies contain language stating that if an excluded cause contributes to a loss in any sequence, the whole loss is excluded, even if a covered cause also contributed. It is usually found near the top of the exclusions section.

The effect matters in exactly the situation where it is hardest to argue: a storm that brings both wind and water. If wind removes part of a roof and storm surge floods the ground floor, the clause is doing real work in deciding what gets paid.

Its enforceability has been litigated in various states with varying outcomes, and a policyholder in a coastal or flood-prone area is well advised to know whether their form contains it before anything happens.

Reading the exceptions, which is where coverage hides

Exclusions are frequently followed by exceptions that restore coverage in specific circumstances, and those exceptions are where a careful reader finds money.

The classic example is the wear and tear exclusion followed by an exception for resulting damage: the failed water heater itself is not covered, because it wore out, but the damage the escaping water did to the floor and the drywall may be.

The distinction is between the thing that failed and the damage the failure caused. It comes up constantly with plumbing, roofing and appliances, and it is worth stating clearly in a claim rather than assuming an adjuster has drawn the line in the same place you would.

Closing the gaps deliberately

Once the exclusions are read as a list of things to buy separately, the shopping list is short and specific.

• Water backup endorsement. Inexpensive, widely available, and covers the sewer and sump failures that a base policy will not. The most commonly recommended addition for a house with a finished basement.
• Service line coverage. The buried water, sewer and electrical lines between the street and the house, which are the homeowner's responsibility and are excluded from most base forms.
• Flood. Worth pricing even outside a mapped high-risk area, because maps describe probability rather than certainty and a meaningful share of flood claims come from outside the highest-risk zones.
• Earthquake. Region-dependent, usually with a percentage deductible rather than a fixed one, which changes the analysis considerably.
• Ordinance or law. Not a peril, but a gap: it pays the difference between rebuilding what was there and rebuilding to current code.

How to read your own policy in twenty minutes

Start with the declarations page, which lists limits, deductibles and every endorsement attached. The endorsement list is the shortest route to knowing what you actually have, because a policy with a water backup endorsement and one without look identical in a summary.

Then read only two sections of the policy itself: the list of what is covered, and the exclusions with their exceptions. Skip the rest on a first pass. Where a sentence is genuinely unclear, write the question down and send it to the agent by email rather than asking on the phone, so that the answer exists in writing.

One question is worth asking the agent directly, in that email: whether the policy is written on a named perils basis or an open perils basis. On a named perils form, only the listed causes are covered and everything unlisted is out, whether or not it appears in the exclusions.

On an open perils form, everything is covered unless excluded, which makes the exclusions list the operative document. Many policies use one basis for the structure and the other for contents, which is why a homeowner can be surprised by a contents denial on a loss the building side paid.

The deductible deserves a look on the same pass. Some are flat dollar amounts and some are percentages of the dwelling limit, and percentage deductibles are increasingly used for wind, hail and earthquake.

A percentage deductible on a large limit is a much bigger number than most people are carrying in an account, and it is the sort of thing better discovered in February than during a claim.

Doing this once, in a quiet month, converts the exclusions from a source of unpleasant surprises into a purchase list. Most of the gaps have a product attached, most of those products cost a small fraction of the base premium, and the one thing that never works is discovering the boundary during a claim.