Concrete Slabs in Kenner, LA

What Do Concrete Slabs Cost in Kenner?

Concrete slab installation in Kenner runs $9 to $15 per square foot in 2026, installed and finished. A 500 square foot garage slab lands between $4,500 and $7,500. A 1,000 square foot commercial slab runs $9,000 to $15,000. Four variables move the number inside that range.

• Subgrade depth: soft organic layers sometimes require excavation of 10 to 12 inches before a base can be placed, adding $1 to $2 per square foot in dig and haul cost.
• Slab thickness: a 5-inch slab uses roughly 25 percent more concrete than a 4-inch slab of the same footprint.
• Reinforcement: #4 rebar on 16-inch centers costs more than wire mesh but is the appropriate choice for unstable clay.
• Dewatering: when the water table is within 2 feet of grade, a pump running through the pour adds half a day and equipment cost.

Confirm whether your project triggers a permit with Jefferson Parish Department of Inspection and Code Enforcement before work begins. Do not rely on a contractor's estimate of the threshold.

What Does Kenner Ground Actually Demand for a Concrete Slab?

Kenner's alluvial clay and organic silt compress gradually under a loaded slab, so the subgrade does more work here than the concrete itself. Skipping base depth or compaction is the single most common reason Kenner slabs crack and tip within five years.

The standard sequence for Kenner ground: excavate to 10 to 14 inches below finished grade, remove any soft organic material, compact the exposed subgrade with a plate compactor in two passes, place 6 to 8 inches of crushed limestone or coarse sand in lifts and compact each lift to 95 percent Proctor density. Lay 6-mil poly vapor barrier across the full footprint with 12-inch overlaps at seams and lap up the forms. Pour 4000 PSI concrete at 5 inches thick in a monolithic pour where the design allows, using a turndown edge to eliminate a separate footing on residential slabs. Screed to a 1/8-inch-per-foot drainage fall away from any structure. Control joints are cut or formed every 8 to 10 feet in each direction within 12 hours of the pour.

#4 rebar on 16-inch centers, set at mid-depth on chairs, is the reinforcement standard. Wire mesh is not adequate for soil with ongoing subsidence potential.

How Does a Kenner Slab Job Run, Start to Finish?

A typical Kenner residential slab takes 3 to 5 days from excavation to a surface ready for foot traffic. Day one is excavation, subgrade inspection, and base placement. Day two is compaction of the final base lift, form setting, vapor barrier, and rebar placement. Day three is the pour, screed, and finish. The slab stays behind forms for 24 hours and is closed to foot traffic for 48 hours. Vehicles stay off for 7 days. Full cure is 28 days.

When groundwater is encountered above 2 feet during excavation, a submersible pump runs continuously through the pour to keep the subgrade dry. That adds 4 to 6 hours to the schedule and is common in lower-lying sections of Kenner near drainage canals.

Recent Slab Project in Kenner

Garage slab replacement, central Kenner, 480 square feet. The original 1970s slab had dropped 3 inches at the rear corner where organic fill had compressed beneath a thin gravel base. Removed the old slab and excavated to 14 inches, removing 6 inches of silty fill before reaching stable clay. Placed and compacted 8 inches of crushed limestone in two lifts, laid 6-mil poly with lapped seams, set #4 rebar on 16-inch centers on 2-inch chairs, and poured 5 inches of 4000 PSI in a single monolithic pour with a turndown edge at the apron. Broom finish, control joints at 8-foot intervals. Four days total, including one day of dewatering.

Questions Kenner Customers Ask About Concrete Slabs

Do I need a thicker slab in Kenner than in other areas?

Yes. Five inches is the practical minimum for any loaded slab on Kenner's clay soil. A standard 4-inch residential slab is appropriate on stable ground, but alluvial clay with a shallow water table compresses unevenly under point loads. The extra inch of concrete, combined with #4 rebar on 16-inch centers, distributes load across a wider area and resists the cracking that follows minor subsidence.

Does the vapor barrier matter if the slab is for a garage?

The 6-mil poly vapor barrier is important regardless of use, because Kenner's water table rises seasonally to within 2 feet of grade. Without it, moisture migrates upward through the slab, weakening the concrete over time and creating surface efflorescence. A garage slab without a vapor barrier in Jefferson Parish typically shows moisture damage within 3 to 7 years.

How soon can I park on a new slab in Kenner?

Vehicle traffic is safe after 7 days, not before. Foot traffic is permitted after 48 hours. Full compressive strength, rated at 4000 PSI for this mix design, is reached at 28 days. Parking heavy equipment or vehicles before the 7-day mark risks surface cracking in concrete that has not yet reached structural strength.

To get a written estimate for a concrete slab in Kenner, call or use the contact form. A crew member reviews the site, checks the subgrade condition, and returns a line-item quote with slab spec, base depth, and reinforcement schedule included.