Concrete Slabs in Gretna, LA

What Do Concrete Slabs Cost in Gretna?

Concrete slab work in Gretna runs $9 to $15 per square foot in 2026. A 400 square foot garage slab lands between $3,600 and $6,000. A 600 square foot patio or shed pad runs $5,400 to $9,000. Three factors move the number on nearly every Gretna job.

First, subgrade depth. Sites where old fill has consolidated require excavating to stable material and replacing with compacted limestone, sometimes 8 to 10 inches deep instead of the standard 6. Second, dewatering. When the water table is within 24 inches of the excavation floor, a pump runs during the entire base prep phase, adding a half-day of equipment time. Third, reinforcement. A standard residential slab uses #3 rebar on 18-inch centers. On Gretna sites with documented fill transitions, the schedule moves to #4 rebar on 16-inch centers, which adds roughly $0.80 to $1.20 per square foot.

What Does Gretna's Ground Demand for a Concrete Slab?

Gretna sits on alluvial clay and backswamp fill, and the dominant failure mode is differential settlement where old fill meets native soil beneath the slab. Correcting for that starts at the subgrade, not at the concrete.

What subgrade preparation does Gretna clay require?

Excavation goes to a minimum of 6 inches below finished slab elevation, deeper where soft spots are found with a probe rod. The base is limestone compacted in 3-inch lifts and tested with a plate compactor to confirm density before any concrete is ordered. Skipping the compaction test is where most settlement failures start in Jefferson Parish.

What vapor barrier and slab spec apply here?

A 6-mil poly vapor barrier laps a minimum of 12 inches at seams and runs continuous under the full slab footprint. The concrete is 4000 PSI mix poured at 4 to 5 inches thick. Slabs with an attached turndown edge use a monolithic pour so the footing and slab cure as a single unit, which performs better on soils that move. Control joints are cut every 8 to 10 feet within 12 hours of the pour to direct any shrinkage cracking.

How Does a Concrete Slab Job Run in Gretna?

A 400 to 600 square foot slab in Gretna typically runs 3 to 4 days from excavation to final screed. The local ground adds at least one step that is not always part of a job on the north shore or in areas with stable fill.

Day one covers excavation, soft spot removal, and base material placement. If standing water is present, a submersible pump runs through this phase. Day two is compaction, grade check, vapor barrier, and form setting. Reinforcement is placed and tied before the pour is scheduled. Day three is the pour itself: concrete is screeded flat, edged, and finished to the specified texture. Control joints are cut the same day. Curing compound goes on immediately after finishing. Foot traffic is safe at 24 to 48 hours. Vehicle traffic waits 7 days. Full design strength reaches 28 days.

Permit requirements vary by job type and scope. Confirm what triggers a permit and any applicable fees with the Jefferson Parish Department of Inspection and Code Enforcement before work begins.

A Recent Concrete Slab Project in Gretna

Garage slab replacement, Gretna

A 480 square foot garage slab had dropped 1.5 inches along the back wall where compacted fill from a previous addition had consolidated against undisturbed clay. The existing slab was removed and the subgrade was excavated an additional 4 inches beyond the standard depth to reach stable material. Eight inches of crushed limestone was placed and compacted in two lifts, verified with a plate compactor before forms were set. The replacement slab was poured monolithic with a turndown edge, 4000 PSI mix at 4.5 inches thick, #4 rebar on 16-inch centers, and 6-mil poly throughout. Broom finish. The job ran 4 days.

Questions Gretna Customers Ask About Concrete Slabs

Do I need a permit for a concrete slab in Gretna?

Permit requirements in Jefferson Parish depend on the slab's size, use, and whether it is attached to a structure. There is no single threshold that applies to every job. Confirm the current requirements directly with the Jefferson Parish Department of Inspection and Code Enforcement before any work starts.

Why does my old Gretna slab keep cracking along the same line?

Recurring cracks in the same location usually mean the subgrade beneath that section is still moving, which is common where fill material meets native clay. Patching the surface does not stop the movement. A lasting repair starts with opening the slab, removing unstable fill, and recompacting the base before re-pouring.

Can a concrete slab be poured in summer heat in Gretna?

Yes, with the right timing. Pours are scheduled for early morning when air temperature is below 90 degrees Fahrenheit, and curing compound is applied immediately after finishing to slow moisture loss. Hot weather that is managed correctly does not affect the finished slab. Hot weather that is ignored shortens cure time and weakens the surface layer.

To schedule a free estimate for a concrete slab in Gretna, call or use the contact form on this site. We review the site conditions, give a written scope, and provide a fixed price before any work is scheduled.