Slab foundation repair and piers

What “slab repair” means

Most Fort Bend homes are built on a slab-on-grade foundation, a single layer of reinforced concrete poured directly on the soil. When the clay underneath shrinks, swells or washes out, part of the slab can drop. You notice it as sloping floors, cracks in tile, gaps above doors and stair-step cracks in brick.

Slab repair means supporting the dropped areas on piers that reach more stable soil, then lifting the slab back toward its original level as far as is safe. The goal is to stop the movement and relieve the stress on the house. The goal is not to make the slab perfectly flat, which usually is not possible without causing new damage.

The common pier types

Pier type	How it’s installed	Typical use
Pressed concrete pilings	Precast concrete cylinders stacked and hydraulically pressed into the soil until they resist	The most common residential repair in the Houston area
Steel push piers	Steel pipe sections driven down using the weight of the house as resistance	Heavier homes, or when firm soil is deeper
Helical piers	Steel shafts with screw-like plates turned into the ground	Lighter structures, or where the right torque can be reached
Drilled concrete piers (bell-bottom)	A hole is drilled, sometimes flared at the bottom, then filled with steel and concrete	Some new construction and specific repair cases

Each method has supporters. What matters most is that the specialist explains why their method fits your house and soil, and puts the depth, spacing and warranty in writing.

What happens on repair day

1. Layout: the crew marks pier locations from the approved plan.
2. Excavation: small holes, often a few feet square, are dug next to the slab at each exterior pier location. Interior piers may be reached by tunneling.
3. Installation: piers are pressed or driven until they hit the planned resistance or depth.
4. Lift: jacks raise the slab in small increments while the crew watches elevation readings.
5. Set and backfill: the slab is set on the piers with steel shims and caps, and the holes are backfilled and compacted.
6. Final readings: a closing set of elevation measurements shows how much the slab came up.

Afterward, it’s normal for some cracks to close up, and for doors that dragged to swing freely again. Some cosmetic cracks may need patching. That’s usually a separate, minor job.

Before you sign

• Get the pier count, type and locations in writing, ideally with a diagram.
• Ask how deep they expect to go and what happens if they can’t reach that depth.
• Ask if plumbing tests before and after the lift are included.
• Check who handles permits and whether an engineer’s letter is provided.
• Read the warranty: length, what it covers, whether it transfers to a buyer, and who stands behind it.
• If the job is large, a second opinion is reasonable and common.

Keeping the repair working

Fort Bend clay keeps moving with the weather, so protect the repair with:

• Gutters and downspout extensions that send roof water several feet away from the slab
• Grading that slopes soil away from the house
• French drains where water pools. See French drains and yard drainage.
• Steady watering along the foundation during long droughts, so the soil does not shrink away from the slab
• Root barriers if large trees are close to the house. See root barriers.

Cost

Per-pier prices vary a lot by type, depth and access. See the cost guide for typical published ranges, then compare that to the written quote a specialist gives you after measuring your home.