Foundation repair in Cibolo: boom-town slabs on old Blackland clay.

The pattern we see in Cibolo is timing-driven: builder warranties expire around year two, pad consolidation and the first hard drought arrive around years three to seven, and that's when the stair-step cracks and sticking doors start the phone calls.

OLD TOWN ON MAIN STREET TO THE STEELE-COUNTRY SUBDIVISIONS — BENTWOOD RANCH AND FALCON RIDGE TO STEELE CREEK AND THE FM 1103 CORRIDOR — MINUTES OFF OUR DAILY I-35 RUN.

The ground along Cibolo Creek

Cibolo is Central Texas expansive-clay country on the prairie's western edge.

Cibolo sits on the north side of Cibolo Creek in western Guadalupe County, at the western edge of the Blackland Prairie where it grades toward the Post Oak Savannah. That means expansive, shrink-swell clay soils along the creek and across most of the city footprint — ground that lifts when it rains and drops when it dries. The USDA maps highly active clay under much of town, and Cibolo Creek's floodplain pulls the low-lying, creek-adjacent lots through the widest seasonal moisture swings. There's no shallow limestone here to hold a slab edge steady, so the wet-dry cycle drives most of what we measure.

Because the geology is fairly uniform, diagnosis in Cibolo is lot-level rather than neighborhood-level. A downspout dumping roof water at one corner all storm season, then baking through August, produces the crack cluster radiating from that corner that's nearly diagnostic in newer subdivisions. Drought pulls the exposed edges down; the first big storm heaves them back unevenly. Most of the cracked drywall we're called about here is that cycle meeting fresh construction — which the free elevation survey confirms or rules out.

A boom town on old ground

From a 1877 rail stop to one of the metro's fastest-growing suburbs.

Cibolo incorporated in 1965 and grew from a rural rail town — its Old Town heritage on Main Street dates to the 1877 railroad, later formalized in a 2010 Old Town mixed-use overlay — into one of the metro's fastest-growing suburbs, from roughly 3,000 residents in 2000 to over 32,000 by 2020. That history means two clear foundation stories. Old Town holds the oldest stock: modest homes on older, lighter footings decades into the clay cycle, where seasonal door sticking and corner cracking are the common calls.

Everywhere else is young. The FM 1103 corridor and the Steele-country subdivisions — Bentwood Ranch, Falcon Ridge, Turning Stone, Cibolo Valley Ranch, Saddle Creek Ranch — were built through the 2000s and 2010s on engineered post-tension pads, and the newest sections like Steele Creek and Buffalo Crossing are still going up in the 2020s. Most perform well; where cut-and-fill met native clay at a lot edge, the seam shows up a few summers later. The pattern is timing: builder warranties expire around year two, and the first hard drought finds the soft spots around years three to seven. A dated elevation map, taken before your 1-2-10 structural window closes, is the objective evidence that makes a claim — or peace of mind — possible.

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