Concrete flatwork in Texas

What does Texas ground do to a slab?

Texas is hard on concrete. Concrete flatwork in Texas has to outlast clay that swells and shrinks, wet ground that pushes water up from below, and summer sun that can heat a slab past 140 F. So the prep, the mix, the rebar, the joints, and the cure all have to fit what Texas will do to that slab over the next 20 years.

We pour concrete flatwork across Texas, from driveways in Wichita Falls and Sherman to truck aprons and barn pads along I-30 at Texarkana. Our Wichita Falls team covers North Texas, and our Texarkana team covers East Texas.

What counts as flatwork?

Flatwork is any flat pour that isn’t a building foundation.

Driveways. A standard driveway in Sherman or Gainesville is 4 inches thick. It gets fiber or wire mesh over 4 to 6 inches of packed crushed stone. That’s built for daily car traffic on stable soil, and we only go heavier when a soil report or the load calls for it. On expansive clay, we step up to 5 to 6 inches with #4 rebar on 16-inch centers and a thickened edge. Pads for RVs and trailers get 6 inches with steel in them.

Sidewalks, patios, and pool decks. Public sidewalks follow city specs: 4 inches, broom finish, ADA slopes, and code joint spacing. A private patio can be a plain broom-finish slab off the back door. It can also be stamped to look like flagstone or slate from across the yard.

Barn pads and shop slabs. Barn floors take 6 inches of concrete, #4 rebar on 12-inch centers, and a thickened edge. A hard trowel finish stands up to urine acid and daily washdowns.

Commercial slabs and loading docks. Loading docks, truck aprons, dumpster pads, and parking pads along I-30 and I-20 are engineered pours. They run 6 to 10 inches thick, sized to the traffic, with #5 rebar on 12-inch centers.

Barndominium slabs. Here the slab is both the foundation and the finished floor inside. See Texas barndominium slab, barndominium shop slab, and the barndominium slab specification guide.

Why does Texas concrete need real subgrade prep?

The dirt under the slab, called the subgrade, decides how long Texas flatwork lasts. Each half of the state fails in its own way.

North Texas expansive clay. Across Wichita, Clay, Montague, Cooke, Grayson, and Fannin counties, most of the ground is expansive clay over weathered Permian red bed. This clay swells when rain soaks it and shrinks as it dries out. The slab rides along. Its plasticity index, a measure of how much it swells, often tops 35, and Blackland Prairie pockets top 50 (Source: Texas AgriLife Extension). In the worst soils, the ground can rise and fall more than an inch a year. Good prep takes four steps:

1. Bring the native dirt to the right moisture.
2. Compact it to 95 percent Proctor, a lab measure of how tight soil can pack.
3. Add 4 to 6 inches of crushed stone.
4. Compact the stone the same way.

The stone spreads the load, and it slows ground water on its way up into the slab.

East Texas sandy loam. The ground in Bowie, Cass, Morris, Titus, Hopkins, and Harrison counties is sandy loam and silt. It holds weight better than the clay belt. Water is the problem. The area gets 45 to 55 inches of rain a year and runs about 70 percent humidity (Source: NOAA). Water finds its own paths through the dirt to the bottom of the slab, paths a builder-grade site plan misses. Where the lay of the land calls for it, we add a capillary break (a stone layer that stops water wicking up) and drainage around the edge.

Summer heat. From June through September, it often tops 100 F. The mix has to stay under 95 F when it’s placed, the limit set by ACI 305R-20. We keep it cool with cold water or iced aggregate (the rock in the mix). We add set retarders to slow the set, and we pour early in the morning or at night. We mist the slab until it first sets, then cut control joints within 4 to 12 hours.

North Texas flatwork: suburbs, ranches, and oilfield yards

North Texas work splits three ways: suburban homes, ranch country, and commercial jobs along US 82 and US 287. Grayson and Cooke counties carry the DFW growth up to the Red River. Wichita Falls and its oilfield service trade drive the commercial side.

A Sherman or Gainesville driveway runs 4 inches with fiber or mesh on stable soil, or 5 to 6 inches with rebar on expansive clay, with a broom finish. On a 4-inch slab, the saw-cut joints land about 8 feet apart. We pour stamped flagstone and slate early in the day or in cooler months. Around Wichita Falls, commercial work means oilfield service yard pads, shop floors, and parking slabs, each bid as its own project. Out in the country, it’s barndominium and farm slabs. Post-tension is common on expansive clay under a big footprint. See Texas barndominium slab.

What does East Texas flatwork along I-30 and I-20 need?

East Texas work runs three ways too: small-city homes, rural barndominiums and shops, and commercial pours along the freight routes.

Distribution corridor flatwork. I-30 runs through Texarkana, Mount Pleasant, and Sulphur Springs. I-20 runs through Longview and Marshall. Both carry warehouses, trucking, and light manufacturing. The common pours are loading docks, truck aprons, and equipment parking pads. For heavy-traffic aprons we spec a 4,000 to 4,500 PSI mix and 8 inches of concrete with #5 rebar on 12-inch centers. We check the packed stone base with a nuclear density gauge. Isolation joints, a gap that lets the slab and the building move apart, go at the building face. Food plants around Paris and Mount Pleasant add cove base and finishes that meet USDA and FDA rules. We check the compaction right before the pour, because East Texas rain can soak the base overnight.

Farm, shop, and home slabs. Barn floors and wash bays here get the same 6-inch barn spec, plus a silicate densifier to harden the top and a slope to the drain. Homes keep us busy too. We pour driveways and patios in Texarkana, Paris, Marshall, Longview, Mount Pleasant, and Sulphur Springs.

Which rebar, mix, and cure does your slab need?

Steel, mix, and cure are the difference between a 25-year slab and one that cracks in three.

Reinforcement by slab type

Match the steel to the traffic and the soil:

• Standard 4-inch driveway: fiber, or 6-by-6 wire mesh set up on chairs.
• Home slab on expansive clay: #4 rebar on 16-inch centers.
• Heavy-traffic commercial: #5 rebar on 12-inch centers, sometimes doubled at the apron edges.
• Home slab over 3,000 square feet on expansive clay: post-tension cable usually beats plain rebar. Crews pull the cables tight 5 to 7 days after the pour, which squeezes the slab together. Post-tension is priced per job, after we see the site or the plan. It almost always costs less than fixing a cracked slab a year later.

#4 rebar on 18-inch centers runs $2.12 a square foot on a Slab Boss Pour. The 16-inch and 12-inch spacing we recommend above is priced per job.

Mix. PSI (pounds per square inch) is how much load the cured concrete can take. We use 3,000 PSI for inside slabs and covered patios, and 4,000 PSI for driveways and other outdoor slabs. Slabs that freeze and heavy commercial work get 4,500 PSI or more. North Texas plants draw their rock from Ogallala gravel and Red River limestone. East Texas plants use rock from the Sabine and Neches river basins.

Joints, cure, and air. Joints go about 24 times the slab thickness apart, cut one-fourth of the way through. We put down a curing compound and add wet curing per ACI 308R-16. Every outdoor slab gets an air-entrained mix, with 5 to 7 percent air.

What should Texas property owners know before pouring?

Permits and utility locates. Texas cities have their own specs for public sidewalks, commercial flatwork, and any pour that crosses a public right-of-way. We handle the permits. Texas 811 needs two working days’ notice before anyone digs. On rural land with private utilities, it can take longer if the co-op or water district has to send someone out. For bigger home and commercial slabs on expansive clay, a soil report from a geotechnical engineer runs $1,500 to $2,500. It measures how much the ground swells and shrinks, and it usually pays for itself the first time.

When to pour. Spring (March to May) and fall (September to November) are the easiest seasons. Days sit between 60 and 85 F, so the mix stays in its working window. Crews don’t have to chase cold water, ice, or pre-dawn pours just to meet the ACI 305R hot-weather rules. Summer and winter pours still work. They just take more care. Our crews are typically 3-6 weeks booked at any given moment.

Pair the work. Driveways often go with a coated garage floor. Barn slabs often get polished once the cure is done. See Texas polished concrete, Texas garage floor coatings, and Texas barndominium slab. With Pour-4-Polish, one spec governs the pour and the finish, so the slab is built for the polish or coating before the truck shows up. That slab takes a finish far more cleanly than one handed off between two trades who never talked. Book a Slab Boss Pour placed to that spec with the polishing on one quote, and you get 30% off field and edge polishing.

Which Texas cities do we serve?

• Wichita Falls, Sherman, Denison, Gainesville, Stephenville, Mineral Wells (940 area code)
• Texarkana, Paris, Marshall, Mount Pleasant, Sulphur Springs, Longview (I-30/I-20 corridors)

Every pour gets the same prep, mix, and cure, tuned for Texas ground. Start with the online quote calculator.