Concrete Slabs in Harvey, LA

What Concrete Slabs cost in Harvey

A concrete slab in Harvey runs $7.50 to $13 per square foot in 2026, installed. A standard 400 square foot patio lands between $3,000 and $5,200. A 600 square foot garage slab or equipment pad typically falls between $4,500 and $7,800. Three factors drive the range.

• Subgrade depth and base material. Harvey sites frequently require 6 to 8 inches of compacted crushed limestone rather than the 4-inch base that is adequate on firmer ground.
• Dewatering. When the water table sits at 2 to 3 feet below grade and recent rain has saturated the clay, a pump runs during excavation and base placement. That adds half a day of labor and equipment.
• Slab thickness. Residential slabs here are typically poured at 5 inches rather than 4, because the clay subgrade does not provide the uniform bearing that thinner sections require.

Confirm permit requirements and any applicable fees with the Jefferson Parish Department of Inspection and Code Enforcement before work begins.

What Harvey ground means for Concrete Slabs

Harvey's alluvial clay over variable fill creates uneven bearing capacity, which is why subgrade preparation carries more weight here than anywhere else in the metro. Where old fill meets native soil, the two layers compress at different rates under load. A slab spanning that boundary cracks unless the subgrade is excavated, tested, and rebuilt uniformly.

The standard approach on a Harvey slab job runs as follows.

• Excavate 10 to 12 inches below finished grade to reach consistent subgrade material.
• Compact the subgrade in 4-inch lifts and verify compaction with a plate compactor test pass. Soft spots receive additional limestone before the next lift.
• Place 6 to 8 inches of crushed limestone base and compact to 95 percent Proctor density.
• Roll out 6-mil poly vapor barrier over the full slab footprint, lapping seams 12 inches, to block moisture wicking from the clay beneath.
• Pour 4000 PSI concrete at 5 inches of thickness. Place #4 rebar on 16-inch centers in both directions, supported 2 inches off the poly on chairs, not brick scraps.
• Use a monolithic pour for any turndown edge footing to avoid cold joints at the perimeter.
• Screed to a minimum 1/8-inch-per-foot fall toward drainage so standing water does not load the slab edge and accelerate edge settlement.

Control joints are saw-cut every 8 to 10 feet within 12 hours of the pour. On a slab wider than 12 feet, a center joint runs the full width.

How the job runs in Harvey

A typical Harvey slab job from excavation to strip takes 3 to 5 days, one day longer than a comparable job on the north shore because of the base material and dewatering work. Day one covers excavation and subgrade grading. Day two is base placement, compaction, and form setting. Day three is rebar, vapor barrier, and pour. Stripping forms and cutting joints follows 24 hours after the pour. The slab carries foot traffic after 48 hours and vehicle traffic after 7 days.

If the site has standing water at the time of excavation, dewatering runs concurrently with grading on day one. This adds roughly 4 hours but keeps the limestone base from pumping under compaction.

A recent Concrete Slabs project in Harvey

Garage slab replacement, Harvey

A 520 square foot detached garage slab had dropped 3 inches at the rear corner over roughly 15 years, driven by differential settlement where imported fill met the original backswamp clay. The original slab was 3.5 inches thick with no vapor barrier and no rebar. Removal exposed a soft zone 4 feet wide along the back wall.

The soft zone was excavated an additional 4 inches and packed with 6 inches of crushed limestone in two compacted lifts before the full base was brought up to grade. The replacement slab was poured at 5 inches of 4000 PSI with #4 rebar on 16-inch centers and a continuous 6-mil poly vapor barrier. A monolithic turndown edge ran the full perimeter. The job ran 4 days. Broom finish, control joints every 9 feet.

Questions Harvey customers ask about Concrete Slabs

Does a concrete slab in Harvey need a vapor barrier?

A vapor barrier is required on every Harvey slab poured over clay subgrade. Harvey's water table sits 2 to 4 feet below grade. Clay holds and transmits moisture upward through capillary action. Without 6-mil poly beneath the slab, moisture migrates into the concrete and causes surface scaling, efflorescence, and adhesion failure in any floor covering placed above.

How thick does a concrete slab need to be in Harvey?

Residential slabs in Harvey are poured at 5 inches rather than the 4-inch minimum that applies on firmer ground. The clay subgrade in Harvey provides lower and less uniform bearing than sandy or gravelly soils. The extra inch of thickness, combined with #4 rebar on 16-inch centers, distributes load across the slab and reduces cracking risk at the fill transition zones common throughout the city.

Can a Harvey slab be poured after heavy rain?

A slab cannot be poured over saturated base material, and in Harvey that condition arrives faster than most crews expect. If the limestone base has absorbed standing water, it will pump under the screed and produce an uneven surface with weak spots. The base needs 24 to 48 hours of dry weather and a final compaction pass before concrete placement. Dewatering with a submersible pump accelerates recovery on sites where the water table is already near grade.

To book a free on-site estimate for a concrete slab in Harvey, call or use the contact form. A crew member visits the site, checks the subgrade, and returns a written scope with material specs and a fixed price before any work begins.