In September 2005, I was sixteen years old with a learner's permit, behind the wheel of my family's car on Interstate 45, helping my mom and my stepfather get us out of south Houston ahead of Hurricane Rita. My little brother was five. The drive that should have taken a couple of hours took most of a day. We sat in gridlock in hundred degree heat with the windows down and the air conditioning off, trying to save the gas we were not sure we could replace. That was survival. You do what you have to do for your family.

Rita set off one of the largest evacuations in American history, somewhere between two and a half and nearly four million people. Heartbreakingly, more lives were lost in that evacuation than to the storm itself. And when it was over, like most families who fled, we came home to a house that was essentially fine. I have never forgotten any of it, and I hope no Houston family is ever put in that spot again. It also left me with a question worth answering long before the next storm. When you cannot go home, what does your insurance actually pay for?

What loss of use actually covers

Loss of use, listed on most policies as Coverage D, is one of the most useful parts of a homeowners policy and one of the least understood. When a covered loss makes your home unlivable, say a hurricane tears off part of the roof or a fire forces you out, this coverage pays the additional cost of living elsewhere while your home is repaired. That means the difference between your normal expenses and the higher ones, a hotel or rental, meals out when you cannot cook, extra mileage, pet boarding, even a storage unit. It pays the gap, not your whole life.

Two details matter. First, there is a limit, usually somewhere around 20 to 30 percent of your dwelling coverage, and a time cap tied to how long repairs reasonably take. Second, most policies include what is called civil authority coverage, which pays those same living expenses, generally for up to about two weeks, when a government order keeps you from your home because a covered disaster damaged the area around you. It even applies when you stay with family, since you can still run up real costs for food, gas, and boarding a pet.

The two gaps that catch families off guard

Here is where the hard lessons live, and where Rita taught me the first one.

A precautionary evacuation is usually not a paid claim. If you leave ahead of a storm and your home is never actually damaged, the gas, the hotel, and the days away generally come out of your own pocket. Loss of use is built to help after a covered loss makes your home unlivable, or after a covered disaster triggers an evacuation order, not simply because you made the wise choice to leave early. Your mortgage still has to be paid either way. None of that means you should not evacuate when it is time. It means you should not count on insurance to fund the trip.

The second gap is flood, and in Houston it is the one that hurts most. Your homeowners loss of use does not apply when the reason you cannot go home is rising water, because flood is excluded from the homeowners policy. And here is the part most people never hear until it is too late. A standard flood policy through the National Flood Insurance Program does not cover loss of use or temporary housing at all. According to the program itself, additional living expenses are simply not part of an NFIP policy. If a flood drives you out, the hotel is yours to pay unless you carry a private flood policy that adds that coverage, which some do. The timing of when flood coverage even takes effect is its own trap, which we cover in why you cannot wait for a named storm.

What to do before the next storm

You cannot control the weather or the traffic, but you can control how ready your coverage is, and that has to happen before a storm is named.

Know your loss of use limit and how it works, so you are not guessing in a hotel parking lot. If your home faces real flood risk, and in Houston most homes do, ask specifically whether a private flood policy with loss of use makes sense for your family, because the standard federal policy will not pay for a place to stay. And if a covered loss ever does force you out, keep every receipt, hotels, meals, gas, boarding, because loss of use pays the difference and that difference is built from the details.

This is what we mean when we say we read the contract before claim time. About 40 percent of the time we tell families their coverage is already where it should be. The rest of the time, we would rather find the gap now, around a kitchen table, than have you find it on the road.