Geotechnical Engineering & Soil Testing in Cibolo, TX
Building on Expansive Clay in Cibolo
Cibolo sits in Guadalupe County adjacent to Schertz and shares the same highly expansive Vertisol clay soils that define the central Bexar County Blackland Prairie. The dominant soil type across much of Cibolo is the Houston Black clay, a Vertisol that swells substantially when wet and shrinks dramatically during dry periods. That shrink-swell cycle is the leading cause of foundation distress throughout this part of Texas. Between 2018 and 2023, Cibolo saw a population growth rate of nearly 21 percent, pushing new construction deep into some of the most reactive clay terrain in the region. Master-planned residential communities going up across Cibolo need geotechnical investigations that quantify exactly how much that ground will move before a foundation gets poured on top of it.
Our Geotechnical Services in Cibolo
Subsurface Exploration
Our field crews run soil borings across Cibolo sites targeting the Houston Black clay and documenting its Plasticity Index, moisture content, and Atterberg limits at multiple depths. Those laboratory results feed directly into the PVR calculation that drives foundation design in this soil type. We also document groundwater depth near Cibolo Creek where seasonal water table fluctuations can compound the effects of expansive clay on foundation performance.
Foundation Recommendations
Most Cibolo residential sites require post-tension slab foundations engineered to handle the PVR calculated from the site-specific soil data. Where PVR values are elevated, we may recommend over-excavation and replacement with non-expansive select fill before the slab is poured. Our reports give your structural engineer the exact numbers and the specific recommendations for your lot, not a regional average.
Why Cibolo Builders Choose San Antonio GeoTech
Cibolo is one of the fastest growing cities in the San Antonio area and the construction pace across Guadalupe County demands a geotechnical firm that understands local soil conditions and can deliver PE-sealed reports on a schedule that keeps your project on track. We are familiar with the City of Cibolo and Guadalupe County permitting requirements. Call us to get a written quote for your site within one business day.