Concrete Slabs in Tuscaloosa, AL

Concrete slabs carry more than they look like they do: cars and trucks, riding mowers, workbenches, tool chests and the walls of the building on top. In Tuscaloosa, many older homes have carports or detached garages with floors that have cracked, dropped in the middle or broken along the edges, and newer lots add sheds, shops and storm-shelter pads that need a level base. Whatever the use, a slab needs firm, drained ground and the right thickness.

Garage floors

Old garage floors fail in familiar ways. The middle sinks and holds water. Cracks spread across the floor and slowly widen. Edges under the walls crumble, and wood framing starts to rot where water sits against it. In many cases the old floor can be broken out and replaced with the garage standing, working inside and tying the new slab to the existing walls. HomeGuide's slab guide puts a two-car garage floor at $2,400 to $6,900, typically 20 by 20 to 24 by 24 feet, reinforced and 4 to 6 inches thick.

Shed, shop and equipment pads

A shed on blocks or bare ground settles unevenly, and doors start to stick. A concrete pad keeps the building square and keeps moisture out of the floor. HomeGuide lists shed foundations at $600 to $4,800 for slabs from 10 by 10 to 20 by 20 feet, usually about 4 inches thick. For a shop with a vehicle lift, a heavy tractor or a generator, we thicken and reinforce the slab where the load sits.

Carports and covered parking

Carports are common on Tuscaloosa ranches, and their slabs often double as the end of the driveway. Where posts land, we thicken the concrete or pour footings so a new or replacement carport has solid support. The slab is pitched so rain that blows under the roof runs out instead of pooling.

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Building on West Alabama clay

A 2024 Auburn University report for the Alabama Department of Transportation studied shrink-swell clay subgrades in western Alabama, where moisture swings caused severe pavement damage. A slab that carries a building has to stay flat through those wet and dry cycles. We remove soft and organic soil, compact a crushed-stone base in layers, and use rebar or wire mesh sized to the slab. Where a building will sit, we thicken the edges to carry the walls, and inside a garage or shop we can add a vapor barrier to slow moisture coming up through the floor.

Slope and drainage

Garage and shop floors should fall slightly toward the door so water from wet cars or a hose runs out. Outside, we grade the ground to carry roof runoff away from the slab edge. A slab that sits lower than the yard around it will flood in Tuscaloosa's heavy rains, so we set the height before the forms go in.

Permits

The City of Tuscaloosa's permit page says permits are required for all new construction, remodels and alterations. A new garage, shop or carport usually counts as new construction. If your home is in one of the city's local historic districts, an outbuilding visible from the street may also need review by the Historic Preservation Commission. We check what your address needs, in the city, Northport or the county.