Foundation Repair Methods, Compared

"Foundation repair" covers a handful of very different jobs, and the right one depends entirely on what's wrong. Sealing a crack and stabilizing a sinking footing have almost nothing in common. Here's a plain look at the main methods, what each is for, and where it fits — so the recommendation you get makes sense.

Crack injection (sealing)

For: non-structural cracks in poured concrete walls, especially leaking ones.

A crack is injected full-depth with polyurethane or epoxy. Polyurethane stays flexible and is great for sealing out water; epoxy is rigid and can restore some structural bond. This is the fix for a stable crack that's letting water in. It's not the answer for a crack tied to a wall that's actively moving.

Carbon-fiber straps

For: walls in the early to middle stages of bowing.

High-strength carbon-fiber straps are bonded vertically across the wall to lock it against further inward movement. They're low-profile, stay out of the way, and don't require excavation. The catch is that they hold a wall where it is — they don't pull it back — so they're right for a wall that's just started to move, not one that's bowed severely.

Wall anchors

For: walls that have bowed further than carbon fiber can handle.

Anchors are set in stable soil out in the yard and connected to a plate on the inside of the wall by a rod. Tightening them holds the wall and, worked gradually over time, can sometimes recover some of the movement. They need yard access on the outside of the wall to place the anchors.

Steel I-beam bracing

For: walls needing heavy restraint where anchors aren't practical.

Vertical steel beams are fixed against the wall and anchored to the floor and framing to brace it. It's a strong, contained option when there's no room outside for anchors.

Push piers

For: settlement — a foundation that's sinking.

Steel piers are driven down through the weak soil to a load-bearing layer, then the weight of the house is transferred onto them. Because they use the structure's own weight to drive, push piers suit heavier loads. In many cases they can lift a settled footing back toward level, not just hold it.

Helical piers

For: settlement on lighter structures and tighter spots.

Helical piers are screwed into the ground like a giant screw until they reach capacity. They work well for lighter loads — porches, stoops, additions — and in areas with limited access, since they don't rely on the structure's weight to install.

Interior drainage and sump systems

For: water — wet basements and the pressure water creates.

A drain tile at the footing collects water and routes it to a sump pump that moves it out and away. This is the workhorse of a dry basement, and because water pressure is behind so much wall movement, drainage is often part of a structural fix too, not just a comfort upgrade.

Crawl space encapsulation

For: damp crawl spaces and the sagging floors over them.

A heavy vapor barrier seals the space from ground moisture, paired with drainage and support jacks where the floor above has dropped. It protects the framing and makes the rooms above drier and warmer.

How the right method gets chosen

The pattern is straightforward once you name the problem: cracks get sealed or reinforced, bowing walls get strapped, anchored, or braced depending on how far they've gone, sinking footings get piered, and water gets drained. The reason a real inspection matters is that houses often have more than one thing going on, and the order you fix them in matters. A good assessment names the cause first, then the method follows.