Calculate cubic yards, bags needed, and Lewisville TX-accurate ready-mix costs for driveways, patios, garage slabs, post-tension foundations & footings across Denton County and the greater DFW Metroplex.
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Use 4–5 in. for driveways. 3,000–3,500 PSI is the Lewisville standard. No air entrainment needed. Probe moisture in black clay before any pour — never pour on dried, cracked, or over-wetted Vertisol. Slope all slabs 1% min. Schedule summer pours before 7 AM. Add set retarder May–Sep.
Patio 4 in · Sidewalk 4 in · Driveway 4–5 in · Garage 4 in · PT Slab 5–6 in (per PE design) · Footing / Pier: per structural engineer
Residential flatwork minimum: 3,000 PSI · Lewisville standard: 3,500 PSI for driveways and exterior slabs · PT foundations: 4,000 PSI minimum per structural engineer design — PT cable layout and stressing per registered PE required · Frost depth: 10 in. — minimal; air entrainment NOT required in Lewisville · Drainage: All slabs must slope minimum 1% away from structures — DFW receives 38 in. rain/yr and pooling on black clay causes severe slab movement · Black clay: Moisture-condition subgrade to optimum water content before placing flex base; never pour on bone-dry cracked Vertisol or over-saturated clay · Summer heat: Add set retarder for all pours when temps exceed 90°F · W/C ratio: ≤ 0.50 for exterior surfaces. Verify all requirements with City of Lewisville Building Inspections before starting permitted work.
A standard 20×20 ft driveway at 4 inches needs ~4.9 cu yd. At Lewisville pricing ($135–$152/yd for 3,500 PSI), material runs $661–$745. The biggest Lewisville driveway mistakes are: pouring on bone-dry, cracked black clay in July (the clay shrinks 6–8% when dry and swells back on moisture, lifting the slab); and skipping the 4-inch compacted flex base layer. Always moisture-condition the Vertisol sub-base and install proper crushed limestone flex base before pouring any Lewisville driveway. Control joints every 8–10 ft are essential over DFW expansive clay.
Lewisville and Denton County are underlain by Houston Black clay (Vertisol series) — a black, waxy, shrink-swell clay with a Plasticity Index of 30–60+ and a volume change potential of 6–10% between wet and dry states. This clay is the primary reason DFW leads the nation in residential foundation repairs annually. When this clay dries during Texas summers, it shrinks and pulls away from slabs — creating voids that cause slabs to crack, tilt, and settle. When it rewets from rain or irrigation, it swells and heaves slabs upward. Moisture management is the single most important concrete factor in Lewisville.
Post-tension (PT) slab foundations dominate Lewisville residential construction because they are the most cost-effective system for managing DFW's extreme expansive clay. A PT slab uses high-strength steel tendons (cables) embedded in the concrete and tensioned to approximately 33,000 lbs after the concrete cures. This pre-compression holds the slab together as one rigid unit, resisting the differential movement caused by the expansive clay beneath it. PT slabs in Lewisville typically use 4,000 PSI concrete, 5–6 inch thickness, and PT cable layout designed by a registered Texas PE — never pour a PT foundation without a structural engineer's stamped design.
Managing Houston Black clay moisture is the foundation of successful Lewisville concrete work. Follow this protocol for every project: (1) Pre-pour moisture conditioning: In summer (May–Sep), the Vertisol sub-base will be bone-dry and cracked — water the sub-base slowly over 3–5 days before excavation to bring it to optimum moisture content (approximately 20–25% water content). Never pour on dry, cracked Vertisol. (2) Sub-base: Place 4–6 inches of compacted Grade 1 crushed limestone or caliche flex base over the conditioned clay and compact to 95% Proctor — this distributes loads and insulates the clay from rapid moisture change. (3) Vapor barrier: 6 mil poly vapor barrier over the flex base for all interior slabs and foundations — this prevents moisture migration from below. (4) Control joints: For flatwork, saw-cut control joints to 1/4 of slab depth within 24 hours of pour at maximum 8–10 ft spacing in both directions — DFW black clay will try to crack the slab at random if you don't control where it relieves stress. (5) Post-pour moisture: For foundations and structural slabs, maintain uniform soil moisture around the perimeter permanently through consistent drip irrigation — the #1 cause of DFW foundation failure is drought-induced perimeter shrinkage. (6) Drainage: Grade all soil away from concrete edges at minimum 6 inches drop per 10 feet — pooling water rewets the clay unevenly, causing differential heave.
Lewisville summers are among the most demanding concrete environments in the continental US outside of Phoenix. From May through September, ambient temperatures routinely exceed 95°F by mid-morning, with concrete surface temperatures reaching 130–145°F in direct sun. Rapid moisture evaporation causes plastic shrinkage cracking within minutes if unmanaged. Follow this Lewisville summer protocol for every warm-weather pour: (1) Schedule all pours to begin at or before 6:30–7:00 AM — aim to have all concrete placed, screeded, and bleed water evaporated before 10 AM; (2) specify set retarder for any pour over 3 cu yd in summer (+$8–$14/yd) — this buys critical working time in DFW heat; (3) order mix with chilled or ice water from your Lewisville ready-mix supplier in June–August (+$10–$16/yd) to reduce concrete temperature at placement; (4) wet all forms, sub-base, and tools with cool water immediately before the truck arrives; (5) apply evaporation retarder spray (Confilm or equivalent) across each freshly screeded section immediately — this is non-negotiable on Lewisville summer pours; (6) erect shade cloth or white poly tarps over large pours if the sun is direct; (7) apply curing compound within 20–30 minutes of final troweling on the entire surface — white-pigmented compound reduces heat absorption; (8) moist-cure for 7 days — in DFW summer heat, keep curing blankets wet at all times or use multiple coats of curing compound. Never add extra water to a hot summer mix on-site — it will cause drastic strength reduction and plastic shrinkage cracking.
Post-tension slabs are the standard residential foundation in Lewisville and across the DFW Metroplex. When working around an existing PT slab or contracting a new one, these rules are critical: (1) Never core-drill, cut, or saw into a PT slab without a PE-certified PT layout drawing — cutting a PT cable under 33,000 lbs of tension causes the cable to retract explosively into the slab, sometimes shooting through the opposite edge. Many DFW homeowners and contractors have been seriously injured by this. Always obtain the original PT layout drawing from the builder or hire a GPR (ground-penetrating radar) cable location service before any concrete cutting on a PT slab. (2) New PT pours: specify 4,000 PSI concrete minimum; do not stress PT cables until the concrete reaches at least 3,000 PSI compressive strength (typically 3–5 days after pour in DFW summer heat, 5–7 days in winter); stressing must be performed by a certified PT contractor using calibrated hydraulic jacks per the PE design. (3) Curing PT slabs: wet-cure or curing compound for 7 days minimum before stressing — proper curing is essential for PT systems to achieve design strength.
Lewisville and Denton County are served by multiple ready-mix batch plants across the DFW Metroplex including facilities along I-35E, TX-121, and the Sam Rayburn Tollway. DFW is one of the most competitive ready-mix markets in the US — multiple large producers including TXI, CEMEX, Vulcan Materials, and regional independents serve the market, keeping prices at or below national averages for equivalent mixes. The Colony, Flower Mound, Carrollton, Coppell, and Grapevine carry identical pricing to Lewisville. Short-load fees of $85–$160 apply for orders under 5–7 cu yd.
| Mix Type / PSI | Lewisville Price / Cu Yd | National Avg | Best For | Air Entrained? | TX Code |
|---|---|---|---|---|---|
| 3,000 PSI | $130–$143 | $130–$148 | Patios, sidewalks, light residential flatwork | Not Needed | Min Compliant |
| 3,500 PSI — Lewisville Std. | $136–$152 | $138–$158 | Driveways, garage floors, general exterior flatwork | Not Needed | Recommended |
| 4,000 PSI — PT Foundations | $145–$160 | $148–$166 | PT slab foundations, grade beams, structural | Not Needed | PT Standard |
| 4,500 PSI — Heavy Structural | $156–$170 | $160–$175 | Commercial grade beams, heavy-load slabs | Not Needed | Compliant |
| 5,000 PSI — Commercial | $164–$185 | $172–$190 | Commercial, tilt-up, industrial floors | As Specified | Compliant |
| Summer Chilled Mix Water | +$10–$16/yd | +$10–$18/yd | All pours when temps exceed 90°F (May–Sep) | Separate | Recommended |
| Set Retarder | +$8–$14/yd | +$8–$15/yd | All large pours above 85°F May–Sep | Separate | Recommended |
City of Lewisville permits, Texas Building Code, PT foundation standards, and DFW black clay soil guidance for Denton County concrete projects.
Apply for City of Lewisville building permits for driveways, PT foundations, retaining walls, and all structural concrete work. Building Inspections enforces the Texas Building Code and performs mandatory pre-pour inspections for PT slab foundations, verifying sub-base preparation, PT cable layout, and vapor barrier placement before any concrete is placed. PT foundation permits require a stamped structural engineering design as part of the permit application. Verify that your concrete contractor holds a valid Texas contractor registration before signing any structural concrete contract in Lewisville.
Visit Lewisville Building InspectionsThe Texas Department of Licensing and Regulation (TDLR) licenses and regulates residential contractors in Texas. Before hiring any Lewisville concrete contractor for structural work — particularly post-tension foundations — verify their registration and license status through TDLR's online license lookup. Texas also requires that all PT slab designs be stamped by a registered Professional Engineer (PE) licensed in Texas. TDLR also administers the Texas Residential Construction Commission standards that govern foundation construction warranties and dispute resolution for Denton County homeowners.
Visit TDLR TexasThe USDA Natural Resources Conservation Service (NRCS) Web Soil Survey provides detailed soil mapping for every parcel in Denton County, including Houston Black Vertisol extent, Plasticity Index ratings, shrink-swell potential classifications, and engineering properties. Use the Web Soil Survey to confirm whether your specific Lewisville lot is mapped as high-swell Vertisol or lower-risk alluvial soils near Lewisville Lake and the Elm Fork Trinity River. Understanding your lot's specific clay profile helps size sub-base requirements, plan moisture management, and determine whether a geotechnical investigation is warranted before PT foundation design and pour.
Visit USDA Web Soil Survey