In North Texas, a crack in your brick, stucco, or siding usually comes from one of two unrelated sources: the ground underneath your house moving, or the exterior surface itself flexing from heat and hail. They look similar from the driveway but they are fixed by completely different trades, and they're covered — or not covered — very differently by your homeowners policy.
Foundation-driven cracks tend to run diagonally through mortar joints in a stair-step pattern, taper from wide to narrow, and cluster near corners, windows, and doors. Cracks caused by thermal cycling or hail tend to be more uniform, spread across a whole elevation, or show up as impact dents and bruised caulk rather than structural separation. Neither type is rare here — Dallas-Fort Worth homes see both, often on the same house in the same year.
Most of North Texas sits on expansive clay — the Blackland Prairie and Eagle Ford formations run through Dallas, Fort Worth, Plano, Frisco, McKinney, and Arlington. These clays absorb water and swell, then dry out and shrink, sometimes by inches of vertical movement across a slab over a single wet-to-dry cycle. When a foundation heaves or settles unevenly, the rigid materials attached to it — brick veneer, stucco, stone, even trim boards — don't have anywhere to go, so they crack at their weakest points: mortar joints, corners, and openings.
The other category is purely a materials-and-weather problem. Fiber cement, vinyl, and painted wood siding expand and contract daily as temperatures swing from cool mornings into 100-plus-degree afternoons. Over years, that constant flexing opens hairline cracks in caulk lines and stucco, especially on west- and south-facing walls that take the most direct sun. Hail adds a third, more sudden mechanism: a spring storm can bruise or crack siding, chip brick, and dent metal trim in a matter of minutes, with no connection to the soil at all. A homeowner who assumes every new crack means the foundation is failing can end up paying for an engineer's visit that finds nothing wrong with the slab — while a homeowner who assumes every crack is "just the heat" can miss real foundation movement until a door won't latch or a floor visibly slopes.
Two regional facts drive almost everything on this page. First, the clay. DFW-area soils have some of the highest shrink-swell activity in the country, and the region's boom-bust rainfall pattern — wet springs followed by long, dry, triple-digit summers, with occasional multi-year droughts — keeps that clay in constant motion. Mature trees planted close to a foundation make it worse by pulling moisture unevenly from the soil on one side of the house. Second, the storms. North Texas sits inside what meteorologists sometimes call hail alley's eastern edge, and the March-through-June severe weather season regularly brings golf-ball to baseball-size hail along with straight-line thunderstorm winds that can gust well past 60-70 mph. Those winds and hailstones do real, sudden damage to siding, gutters, and roofing that has nothing to do with the ground beneath the slab.
This is a different problem than coastal Texas deals with. There's no hurricane storm surge and no salt-air corrosion issue driving material choices here. The two forces that matter in Dallas, Fort Worth, Plano, Frisco, Arlington, Irving, McKinney, and Denton are what the clay is doing to the slab and what the sky is doing to the exterior — and a lot of exterior repair work in this region gets misdiagnosed because those two forces get lumped together.
Start with documentation, not diagnosis. Photograph new cracks with a coin or ruler for scale and note the date. If a crack changes width in a season or two, that's meaningful; if it's been static for years, it may be old cosmetic movement that already settled out. Check the classic foundation signs at the same time: doors or windows that stick or won't latch, gaps opening between trim and siding, visible slope in a floor, or cracks that appear on both the interior drywall and the exterior wall in roughly the same spot. Those are worth a call to a licensed structural engineer or a reputable foundation repair company for an actual evaluation — not a siding or roofing contractor, and not a foundation company that also happens to sell you the repair on the spot without an independent inspection.
Separately, have the exterior envelope itself inspected, especially after any hail event or at the start of storm season. This is where a contractor like Alpine Exteriors is useful: we look at siding, trim, flashing, and roofing for hail bruising, cracked caulk joints, and heat-fatigued material, and we can tell you plainly when what we're seeing looks like a foundation issue instead of a siding or roofing issue, so you're not paying to caulk over a crack that's going to reopen the moment the slab shifts again. On insurance, know that most standard Texas homeowners policies exclude damage from foundation movement, settling, and expansive soil unless you've added a specific endorsement — while wind and hail damage to siding and roofing is typically a covered peril, subject to a separate wind/hail deductible that in Texas is often a percentage of your dwelling coverage rather than a flat dollar amount. That split matters for the order of repairs: stabilize a moving foundation first, because sealing or replacing exterior finishes before the slab is addressed usually just buys you the same crack again in a year or two. Consistent watering practices around the foundation during summer droughts — a soaker hose on a timer rather than none at all — is one of the few things a homeowner can do proactively to reduce clay shrinkage before it starts pulling on your walls.
Often, roughly. Stair-step cracks through brick mortar, cracks that widen at one end, and cracks paired with sticking doors or sloped floors point toward foundation movement. Scattered dents, bruised caulk, and cracks confined to one storm-facing wall point toward hail or thermal stress. When it's ambiguous, or when both seem to be happening at once, it's worth getting an exterior inspection and a foundation evaluation as two separate opinions rather than guessing.
Usually not on its own. Standard Texas homeowners policies commonly exclude gradual settling and expansive-soil movement, which is the main cause of foundation cracking here. Some insurers offer an optional foundation or slab endorsement — check your declarations page or ask your agent directly, since coverage varies by carrier and policy.
A quick walk-around after the worst of a summer drought and again after a wet spring is a reasonable habit, since those are the seasons when clay shrink-swell is most active. Photographing existing cracks once and comparing every few months is enough to catch meaningful movement without becoming a chore.
It stops the cause, but existing cracks generally still need to be repaired, patched, or replaced afterward — foundation stabilization doesn't heal material that's already cracked. It does mean that repair should hold, instead of reopening the way it would if you patched over an untreated, still-moving foundation.
If you're seeing new cracks in your siding, brick, or stucco anywhere from Denton to Arlington, Alpine Exteriors can walk your exterior, tell you what we're actually looking at, and point you to a foundation specialist if that's what the evidence suggests. We'd rather give you a straight answer than sell you a caulk job that won't hold. Reach out to schedule an inspection and get a clear picture of what your home needs next.