Foundation Repair Methods Explained

Not all foundation repairs are the same. The right method depends on what type of foundation you have, what's causing the problem, your soil, and your budget. Here's a plain-language breakdown of what contractors actually use.

Pier Systems

Piers are structural supports driven into the ground to stabilize or lift a sinking foundation.

Helical Piers Screw-shaped steel piers rotated into the soil like a giant screw. Good for lighter structures, new construction, and spots where vibration is a concern. They work in almost any soil condition.

Push Piers Steel pipe sections hydraulically driven deep until they hit load-bearing strata. The foundation is then lifted and locked to the pier. Better for heavier structures where helical piers don't have enough soil support.

Resistance Piers Similar to push piers, but they use the weight of the structure itself as resistance during installation.

Concrete Lifting

When concrete slabs have settled, lifting them is usually cheaper than tearing them out.

Mudjacking A slurry of sand, cement, and soil is pumped under the slab through small holes, filling voids and raising the concrete. It's inexpensive and effective, though heavier than foam alternatives.

Polyurethane Foam Lifting Expanding foam injected under the slab lifts it as it cures. Lighter, faster, and less invasive than mudjacking. Costs more per job, but the holes it leaves are smaller and the cure time is quick.

Wall Repair Methods

Carbon Fiber Straps For bowing basement walls with less than 2 inches of inward movement. Carbon fiber straps are bonded to the wall to stop further movement. They can't reverse existing bowing, but they're good at preventing it from getting worse.

Wall Anchors / Tiebacks Steel plates anchored in the soil outside the foundation connect through the wall to interior plates. They can stabilize the wall and, over time, gradually pull it back.

Wall Plate Systems Similar to anchors but use a different mechanical approach to stabilize and correct bowing walls.

Drainage Solutions

A lot of foundation problems start with water. Fix the drainage and you often stop the damage.

French Drains Perforated pipe buried in gravel that redirects water away from the foundation.

Interior Drainage Systems Channels cut into the concrete floor along the perimeter collect water and send it to a sump pump.

Sump Pumps Collect and pump out water that builds up below the foundation floor.

Choosing the Right Method

There's no one-size-fits-all answer here. A good contractor will look at your foundation type, soil conditions, and the specific movement before recommending anything. Get at least two or three opinions before you commit.