Garage Floors & Slabs in Lenexa, KS

Garage floors and slabs carry more than people expect: cars and trucks, mowers, snow blowers, workbenches, storage racks and, at the edges, the weight of the walls. In Lenexa’s 1970s and 1980s homes, original garage floors have often cracked across the middle, sunk near the door or broken at the apron where the driveway meets the garage. Newer homes add sheds and workshops that need a proper pad. Either way the goal is a level, reinforced slab on firm, drained ground.

Replacing a garage floor

Old garage floors fail in a few familiar ways. The center sinks and collects water. Cracks spread and open wider each year as the clay underneath swells and shrinks. The front section by the door drops below the driveway, and water runs into the garage instead of out. In most attached garages the old floor can be broken out and replaced with the house in place, working inside the building and tying the new slab to the existing foundation where needed.

Lenexa’s residential inspection guidelines include a garage slab inspection that verifies the placement, size and location of reinforcing steel before the concrete goes in. The city’s foundation checklist also notes that a vapor barrier is not required under a garage slab, unlike slabs under living space. When a garage floor job needs a permit, we schedule that inspection before pour day.

What makes a garage slab last

• Compacted rock underneath, so the floor is evenly supported on clay
• The right thickness: HomeGuide’s slab guide says two-car garage floors are typically reinforced concrete 4 to 6 inches thick
• Reinforcement, rebar or wire mesh, to keep cracked sections together and level
• Slope toward the door, so meltwater and car-wash water drain out
• Joints laid out so shrinkage cracks run where they are planned
• A clean transition to the driveway apron, without a lip that traps water

Shed and outbuilding pads

A shed pad is lighter work than a garage floor, but it still needs a level, compacted base, or the shed racks and the doors stop closing. HomeGuide says shed slabs are usually about 4 inches thick and often need no reinforcement or decorative finish. For permits, Lenexa’s accessory structure guide says detached accessory buildings of 120 square feet or less do not need a permit, though they must still meet setbacks, and buildings of 600 square feet or less do not need frost-depth footings. Larger buildings need a permit and footings to the city’s 36-inch frost depth. Structures generally have to sit in the rear yard. We check the setbacks for your zoning before we form a pad.

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Other slabs we pour

• Air-conditioner and generator pads
• Trash and recycling pads beside the garage
• Side parking pads for a trailer or boat
• Hot tub bases, sized and reinforced for the full weight of a filled tub
• Workshop floors with thicker sections under heavy machines

Taking care of a garage floor

Rinse salty slush off the floor when you can, because brine sitting on concrete speeds up flaking. A sealer or coating protects the surface from oil and salt. Keep gutters and downspouts working so water does not pool along the garage walls and soften the soil under the slab edges. HomeGuide’s slab guide says a slab is drivable after 1 to 2 weeks and fully cured in 28 to 48 days, so give a new floor that time before parking heavy vehicles on it.