Concrete Slabs in Metairie, LA

What Do Concrete Slabs Cost in Metairie?

A concrete slab in Metairie runs $9 to $15 per square foot in 2026. A 400 square foot patio lands between $3,600 and $6,000. A 600 square foot garage slab lands between $5,400 and $9,000. Three factors move the number on a Metairie job more than elsewhere.

• Base depth: If existing fill is organic or unconsolidated, excavation goes deeper and base material volume rises. An extra 2 inches of limestone across 500 square feet adds $300 to $500 in material alone.
• Reinforcement grade: Soft clay subgrade requires a full rebar mat rather than wire mesh, which adds $1.50 to $2.50 per square foot.
• Dewatering: When the water table is within 3 feet of the subgrade, a pump runs during excavation and base compaction. That adds a half-day of equipment time to the job cost.

Permit requirements vary by slab size and use. Confirm current thresholds and fees with the Jefferson Parish Department of Inspection and Code Enforcement before breaking ground.

What Does Metairie Ground Demand for a Concrete Slab?

The soft alluvial clay and organic silt under Metairie compress unevenly under load, so the subgrade preparation and slab section both require more material than a standard pour. The following specs reflect what Metairie conditions actually require.

Subgrade and base

Existing soil is excavated to a minimum of 8 inches below finish slab elevation. The base layer is 6 inches of compacted crushed limestone, placed in two 3-inch lifts and compacted to 95 percent of maximum dry density. Compacted sand can substitute on some sites, but limestone drains faster, which matters near a high water table.

Vapor barrier and slab section

A 6-mil poly vapor barrier lays over the compacted base before any concrete is placed. The barrier protects against moisture migration from below, which accelerates in Metairie's saturated subsoil. Slab thickness is 5 inches for residential applications and 6 inches for slabs carrying vehicle loads. The mix is 4000 PSI to handle the stress of a subgrade that continues to move in small amounts over years.

Reinforcement and joints

A #4 rebar grid on 16-inch centers runs through the full slab, tied and chaired 2 inches off the vapor barrier. Turndown edges are formed monolithically on slabs where a thickened perimeter replaces a separate footing. A monolithic pour on a turndown edge reduces the number of cold joints, which are a common crack initiation point on settling subgrade. Control joints are saw-cut every 8 to 10 feet within 12 hours of the pour.

How Does a Concrete Slab Job Run in Metairie?

A typical Metairie slab job runs 3 to 5 days from excavation to a slab ready for foot traffic. Day one is excavation and dewatering if the water table is close. Day two is base placement and compaction across both lifts, which cannot be rushed. Day three is forming, rebar placement, vapor barrier, and the pour. The screed pass and finishing happen the same day. Control joints are cut the following morning. Foot traffic is safe at 24 to 48 hours. Vehicle traffic waits 7 days. Full cure is 28 days.

Recent Slab Project in Metairie

Garage slab replacement, central Metairie. The original 1970s slab had settled 3 inches at the low corner and cracked across two-thirds of its area from subgrade consolidation beneath old organic fill. Demolished and removed 550 square feet of existing concrete, excavated 10 inches to reach competent material, and placed 6 inches of limestone in two compacted lifts after pumping standing water from the excavation. Poured 5 inches of 4000 PSI concrete with a full #4 rebar mat on 16-inch centers over 6-mil poly, formed with a turndown edge on the drive side. Broom finish. Four days total.

Questions Metairie Customers Ask About Concrete Slabs

Does my Metairie slab need rebar or is wire mesh enough?

On Metairie's soft clay subgrade, a #4 rebar grid on 16-inch centers is standard. Wire mesh controls plastic shrinkage cracking but provides little structural reinforcement when the subgrade shifts. Rebar holds the slab together if the ground moves beneath one section, which it eventually does in this soil.

How long before I can park a vehicle on a new slab in Metairie?

Vehicle traffic requires 7 days minimum. Concrete reaches approximately 70 percent of its design strength at 7 days and full 4000 PSI strength at 28 days. Driving on a slab before 7 days risks surface damage and can crack a slab that has not yet reached structural strength.

Will my slab settle over time even if it is built correctly?

Minor long-term settlement of 0.25 to 0.5 inches over 10 to 15 years is possible on organic subgrade in Metairie even with proper base prep. A well-compacted limestone base and a monolithic pour with turndown edges significantly reduce settlement and keep any movement uniform rather than differential.

Contact New Orleans Concrete Contractors for a free on-site estimate in Metairie. A crew member reviews the existing subgrade, measures the area, and returns a written scope with material specs and a firm price range before any work begins.