A crack is repaired once it has stopped changing. Filling one that is still opening buys a season and destroys the only record you had of how fast the house was moving.

Why the Houston seasons matter to the timing

An ordinary two-year storm here drops 5.1 inches in a day onto ground running to 51% clay, which swells as it takes water and shrinks as it dries. Some of what a dry spell opens will close again after rain. Measuring across that swing rather than within it is what separates seasonal movement from movement that is going somewhere.

Watching a crack through wet ground and dry

Order of operations: record it, leave it, then decide. A phone photograph with a ruler held against the crack, repeated a season later, costs nothing and settles the only thing in dispute. A survey does better still, because it also separates settlement from heave, and those two call for opposite work.

How long to wait has a local answer. The 2-year 24-hour rainfall for this location is 5.1 in, which is to say a serious soaking is an ordinary event here rather than a rare one. In the Harris County mapping, the highest mapped share of soil susceptible to ponding is 5 percent, so lots where water stands are a minority and they are not spread evenly. If yours is one of them, the crack you are watching may be answering to a puddle beside the slab rather than to anything the whole house is doing. Either way, a record spanning a wet stretch and a dry one carries information a record from one month cannot.

Sealing it early does damage of its own. The filler hides the evidence, the following months produce nothing visible, and the movement proceeds underneath until it returns, by which point both the money and the timeline are gone. One case runs the other way: where a crack is actively letting water into the structure, closing it solves a water problem on its own terms, and the measurement can continue around it.

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