Policies commonly separate a sudden event from gradual movement. Foundation claims usually turn on which one the evidence supports. Read your own policy and ask your insurer directly — nobody else can tell you what yours covers.

The cause an adjuster will ask about in Houston

Up to 51% of the mapped soil here is clay, and the dominant unit is Clodine-Urban land complex, 0 to 1 percent slopes. So seasonal ground movement is the default explanation in this area. It is also the explanation least likely to be treated as a sudden event. That is why finding a plumbing leak, if one exists, changes the conversation. It replaces a gradual process with something that has a date attached.

An event with a date versus the ground’s ordinary year

Policies generally separate something that happened from something that has been happening, and the ground here reliably supplies the second kind. In the Harris County mapping this site reports, the largest mapped soil unit is somewhat poorly drained, meaning soil that takes water up and releases it slowly. That describes an annual cycle rather than an incident, and cyclical movement is the category most often excluded.

It is worth being exact about what the same county mapping does and does not say. The flooding frequency recorded for that largest mapped unit is None, which is a statement about a soil map unit and not a forecast for your street. Separately, the 100-year 24-hour rainfall for this location is 16.9 in. Storm water standing on a lot, a bayou out of its banks, and a supply line failing beneath a slab occupy three different places in a policy. Only some of them carry a date.

Which is the argument for pressure-testing the drains before you file anything. Testing first tells you whether a leak exists under the slab. A leak supplies exactly the dated cause that policy wording is built around. Testing after a denial yields the same information stripped of its weight. Alongside it, keep dated photographs, an elevation survey, and whatever inspection came with the purchase. Nobody, this page included, can say how your insurer will decide. What can be said in advance is which facts the decision rests on, so they exist before anyone asks.

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