Calculate cubic yards, bags needed, and Lexington KY-accurate ready-mix costs for driveways, patios, garage slabs, foundations & footings across Fayette County and the greater Lexington Kentucky Bluegrass metro.
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Use 4–5 in. for driveways. 3,500 PSI + 4–6% air entrainment recommended for all Lexington exterior flatwork. Footings must extend below the 18 in. frost depth. Karst site? Request a geotech probe before pouring any Lexington foundation. Avoid deicing salt for the first winter.
Patio 4 in · Sidewalk 4 in · Driveway 4–5 in · Garage 4 in · Footing 10–14 in (below 18 in. frost) · Foundation 8–10 in
Exterior flatwork minimum: 3,500 PSI + 4–6% air entrainment recommended · Structural concrete: 4,000 PSI for foundations and grade beams · Interior slabs: 3,000 PSI (no air entrainment needed) · Frost depth: 18 in. — all Lexington footings must extend below · Karst geology: Geotech probe strongly recommended before any Lexington structural foundation pour · Rebar: #3 minimum for residential flatwork over Bluegrass clay · Curing: 7-day minimum; insulated blankets for pours when temps drop below 40°F · Deicing: Avoid all chloride-based deicers for first 12 months. Confirm with Lexington-Fayette Urban County Government — Permits & Inspections before starting permitted work.
A standard 20×20 ft driveway at 4 inches needs ~4.9 cu yd. At Lexington pricing ($140–$158/yd for 3,500 PSI air-entrained), material runs $686–$774. Air entrainment is important in Lexington — Kentucky's transitional climate delivers enough freeze-thaw cycles to cause surface scaling on non-air-entrained concrete within 4–7 years, especially when deicing salts are applied. Specify 4–6% air and W/C ≤ 0.50 for all Lexington driveway pours and seal the surface at 28 days.
Lexington sits atop the Lexington Limestone Formation — a Ordovician-age carbonate bedrock riddled with dissolution voids, fractures, and incipient sinkholes. This karst geology is the same system underlying Mammoth Cave in western Kentucky. Dissolution voids can be inches to feet below a building's footprint with no surface indication. For any Lexington structural foundation, a geotechnical probe or GPR (ground-penetrating radar) survey is strongly recommended before excavation to identify voids that would require grouting before concrete placement.
Fayette County's famous Maury silt loam — the rich Bluegrass soil series that underpins Kentucky's horse farm legacy — is a moderately plastic, fine-textured soil with a PI of 10–20. It is moderately expansive compared to East Texas red clay but still requires proper moisture-conditioning and compaction before concrete sub-base placement. Compact Maury silt loam to 95% of Standard Proctor density at optimum moisture content, then place 4–6 inches of compacted crushed limestone before pouring any Lexington slab or foundation.
The karst limestone geology underlying Lexington and Fayette County is the most geologically distinctive foundation challenge in the Kentucky Bluegrass region. Unlike expansive clay risks that are widespread, karst void risk is highly localized — two adjacent lots can have entirely different subsurface conditions. Every Lexington structural foundation should follow this protocol: (1) commission a licensed Kentucky geotechnical engineer to conduct a pre-design soil borings and probe investigation — borings should extend at least 5 feet into sound limestone to confirm bearing capacity; (2) if voids or dissolution zones are encountered above or within the bearing zone, pressure-grout all cavities with neat cement or sand-cement grout before excavation; (3) specify minimum 4,000 PSI concrete for all foundations — karst sites with variable bearing may experience differential settlement that demands higher-strength, stiffer concrete; (4) consider mat (raft) foundation designs for larger structures over karst to spread loads across a wider area and reduce differential settlement risk; (5) after construction, maintain positive site drainage away from the foundation permanently — water infiltration drives continued limestone dissolution. Lexington LFUCG Permits & Inspections may require a soils report for permits on lots in known karst-active zones.
Lexington sits in a transitional zone between humid subtropical and humid continental climate — winters are mild enough to pour most months but cold enough to require precautions from November through March. With 15–25 freeze-thaw cycles per year, air entrainment is worth specifying for all exterior work. For cold weather pours (when ambient temperature is below 40°F): (1) specify heated mix water (+$10–$16/yd) from your Lexington ready-mix supplier; (2) ensure concrete temperature is 55–70°F at placement; (3) never pour on frozen or frost-covered subgrade; (4) cover all exterior pours immediately with insulated curing blankets and maintain for 5–7 days minimum; (5) for interior basement floors in winter, seal all openings and use a propane or electric heater to maintain ambient temperature at 50°F+ for 7 days after pour. Lexington's relatively mild winters compared to Louisville or Lincoln mean cold-weather concrete is manageable with basic precautions.
Lexington summers are characterized by high humidity (65–80% RH) combined with temperatures of 88–95°F from June through August. High humidity actually slows evaporation from concrete surfaces compared to dry-heat cities like Phoenix — but the combination of heat and humidity can accelerate set in the mix. For summer Lexington pours above 85°F: (1) schedule pours before 8 AM; (2) add set retarder to the mix (+$8–$12/yd) for any large pours over 5 cu yd; (3) wet forms and subgrade the night before; (4) apply evaporation retarder spray (Confilm) immediately after screeding each section; (5) apply white-pigmented curing compound within 30 minutes of final troweling; (6) moist-cure for 7 days minimum — Lexington's warm, humid air helps maintain adequate moisture for curing without as aggressive management as in desert climates.
Lexington and Fayette County are served by multiple ready-mix batch plants including facilities along I-64, I-75, and the New Circle Road corridor. Kentucky pricing is competitive mid-South — similar to Louisville, above Lexington's rural surrounding counties. Georgetown, Nicholasville, Richmond, and Winchester carry comparable pricing. Short-load fees of $90–$170 apply for orders under 5–7 cu yd across Fayette County batch plants.
| Mix Type / PSI | Lexington Price / Cu Yd | National Avg | Best For | Air Entrained? | KY Code |
|---|---|---|---|---|---|
| 3,000 PSI | $133–$146 | $130–$148 | Interior slabs, basement floors | Not Needed (Interior) | Interior Only |
| 3,500 PSI + Air — Lexington Std. | $140–$155 | $138–$158 | Patios, sidewalks, general exterior flatwork | 4–6% Recommended | Compliant |
| 4,000 PSI + Air — Driveways/Structural | $148–$162 | $148–$166 | Driveways, foundations, karst-site structural | 4–6% Recommended | Recommended |
| 4,500 PSI — Structural | $158–$172 | $160–$175 | Grade beams, karst mat foundations, heavy loads | 4–6% Recommended | Compliant |
| 5,000 PSI — Commercial | $165–$188 | $172–$190 | Commercial, tilt-up, high-strength structural | As Specified | Compliant |
| Winter Heated Mix | +$10–$16/yd | +$10–$20/yd | All pours when temps below 40°F (Nov–Mar) | Separate | Recommended |
| Summer Set Retarder | +$8–$12/yd | +$8–$15/yd | Large pours when temps exceed 85°F (Jun–Aug) | Separate | Recommended |
LFUCG permits, Kentucky Building Code, karst geology investigation, and Bluegrass soil standards for Fayette County concrete projects.
Apply for Lexington-Fayette Urban County Government (LFUCG) building permits for driveways, foundations, retaining walls, and all structural concrete work. LFUCG Permits & Inspections enforces the Kentucky Building Code and performs mandatory pre-pour footing and foundation inspections. Karst-active zones in Fayette County may require a geotechnical investigation report as a condition of permit issuance. Verify contractor insurance and licensing credentials through the Kentucky Department of Housing, Buildings and Construction before signing any concrete contract.
Visit LFUCG PermitsThe Kentucky Department of Housing, Buildings and Construction administers the Kentucky Building Code (KBC), which governs all residential and commercial concrete construction in Lexington. The KBC is based on the International Building Code with Kentucky amendments and specifies minimum concrete strengths, frost protection requirements, and inspection protocols. Kentucky also licenses residential contractors through this department — verify that any Lexington concrete contractor holds a valid Kentucky contractor license before signing an agreement for structural work.
Visit KY DHBCThe Kentucky Geological Survey (KGS) at the University of Kentucky publishes detailed karst hazard maps, sinkhole databases, and limestone bedrock geology data for Fayette County and the inner Bluegrass region. Use KGS resources to pre-screen your specific Lexington property for documented karst features, sinkhole history, or dissolution zones before commissioning a full geotechnical investigation. KGS also publishes guidance documents on building on karst in Kentucky — essential reading before pouring any Lexington structural foundation on a site with limestone bedrock near the surface.
Visit Kentucky Geological Survey