Concrete Slabs & Foundations for Texas Structures
Monolithic slabs, post-tensioned foundations, and pier-and-beam slabs — engineered for Gulf Coast clay.
Foundation work is where the soil meets the structure — and in the Gulf Coast clay belt, it's where most cheap contractors get exposed. The Beaumont clay running through Galveston County and the south Houston area is some of the most expansive soil in the country. A foundation poured without proper engineering will crack, heave, and pull away from the structure within a few years.
Texas Strong Concrete pours monolithic residential slabs, post-tension slabs, garage and shop foundations, ADU pads, and commercial slabs across our service area. Every pour is engineered to the local soil profile — we don't pour off a generic spec. Where soil conditions warrant, we work with a licensed structural engineer to stamp the foundation plan before any concrete is ordered.
What You Can Expect
Engineered for Expansive Soil
Post-tension or rebar grid sized for Gulf Coast clay.
Vapor Barrier + Insulation
Properly placed under every slab — code is the minimum.
Slab Edges Done Right
Turned-down edges with proper rebar overlap at corners.
Concrete Mix Spec'd Locally
4,000-5,000 PSI, air-entrained for our climate cycle.
Why Texas Strong Concrete for Foundations & Slabs
The foundation is the most important pour we do — everything else on the property rests on it, and getting it wrong is the single most expensive mistake possible in residential construction. The combination of Gulf Coast clay soil, hurricane storm-surge potential, and the long-term load of a Texas house means foundation work in our service area requires more engineering than the same job in, say, central Kansas. We treat every foundation pour as engineered work, not just concrete delivery.
The two foundation systems we install most often are monolithic slab with rebar reinforcement and post-tension slab with stressed cables. Monolithic slab means the entire foundation — the field, the thickened edges, and any interior grade beams — is poured at one time, with continuous reinforcement throughout. Post-tension uses high-strength steel cables run through plastic sheaths inside the slab; after the concrete cures, the cables are tensioned (stressed) to put the slab into compression. Post-tension is the dominant residential foundation in the Gulf Coast because it handles expansive clay better and resists cracking under soil movement.
Both systems start with the same prep: we strip topsoil, compact the sub-base in lifts, place a moisture barrier (typically 10-mil polyethylene), and place steel rebar or cables on chairs at the proper height. The thickened edges are formed around the perimeter and under any interior load-bearing walls; these turned-down edges transfer the load to the soil below frost line (which in our area is a non-issue — frost depth is essentially zero — but the edge thickening serves the structural purpose). Vapor barriers and termite-prevention treatments go in before the concrete arrives.
Concrete mix design matters at the foundation level. Residential slabs in our area use 3,000-4,000 PSI concrete with proper air entrainment. Garage and shop slabs use 4,000 PSI minimum with fiber additives. Commercial slabs spec to the engineered plan. We use local ready-mix suppliers (Cemex, Argos, or independent batch plants) who deliver fresh and on time; concrete that arrives more than 90 minutes from batch is rejected.
For barndominiums, ADUs, and commercial slabs, we work with licensed structural engineers on every project. Engineering stamps run $800-2,500 depending on project complexity; we include this in the bid up-front, not as a surprise charge. For projects on lots with known soil issues — much of Texas City, parts of Dickinson, lower Galveston — we recommend a geotechnical (soil) test before designing the foundation. The $1,500-2,500 soil test pays for itself if it reveals an issue requiring deeper sub-base or moisture mitigation. Call (833) TSC-CONC to discuss your project; we'll walk the site, talk through engineering needs, and give a written scope before any contract.
What You Can Expect
Foundations & Slabs Service in Every Major Texas City
We handle foundations & slabs sales across all 15 of our Texas markets — click your city for localized details.
When Foundations & Slabs Is the Right Choice
Common situations where homeowners across Texas reach out to us.
You're building a new home or ADU
New construction requires engineered foundation plans, soil testing, and code inspection. We coordinate the whole stack.
You need a garage, workshop, or barn slab
Detached structures usually use monolithic slabs with turned-down edges. We pour to the loading the structure will see.
You're adding a room or sunroom that needs its own slab
Additions require a new slab tied to the existing foundation with proper rebar dowels. Done wrong, you get a crack right at the joint.
You want a barndominium foundation
Barndos use thicker slabs with extra rebar to handle the steel-building loads. We've poured several in Manvel, Santa Fe, and rural Galveston County.
You're pouring a commercial slab for a small business
Commercial slabs need engineered design for the load class. We work with the engineer and pull permits.
Common Questions About Foundations & Slabs
What's the standard thickness for a Texas residential slab?+
Most residential slab-on-grade foundations are 4 inches thick in the field with thickened (8-12 inch) edges at the perimeter and under load-bearing walls. Garage slabs run 4-6 inches. Workshop and barndominium slabs run 5-8 inches depending on what's stored or operated inside.
Do you use rebar or post-tension?+
Both, depending on the application. Rebar with welded wire mesh is standard for garages, ADUs, and small additions. Post-tension (cables stressed after the pour) is the dominant residential foundation in our area because it handles expansive clay better and uses less steel. We recommend the right one based on soil and structure.
How long should concrete cure before building on top?+
Concrete reaches 70% of its design strength in 7 days and 90% in 28 days. We allow framing to start at 7 days for residential and at 14 days for heavier commercial structures. Full design strength (28 days) is when furniture, vehicles, and loads can go on.
What's the cost of a residential slab in Galveston County?+
Monolithic residential slabs run $6-9 per square foot installed in our area. Post-tension slabs run $7-11 per square foot. ADU and garage slabs are smaller pours so the per-square-foot cost is higher ($10-14) because of mobilization.
Do you need a permit for a slab foundation?+
Yes for any structure that will be lived in or has utilities. ADUs, garages, workshops, and additions all need a building permit, which includes a foundation inspection. We handle the permit and coordinate with the inspector.
How does Gulf Coast soil affect slab design?+
Expansive clay heaves with moisture changes. We address this with thickened edges, properly engineered post-tension cables (when applicable), and in some cases a layer of select fill or sand between the slab and the native clay. Local engineers know the soil; we coordinate with them on every foundation.
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