Basement wall bracing for bowing walls
A wall that leans in or has a long horizontal crack is being pushed by the soil outside. Bracing stops it from moving further.
Basement walls hold back tons of soil. When that soil is soaked from snowmelt or freezes and expands against the foundation, the pressure goes up. Concrete block walls are especially prone to bowing inward along a horizontal mortar joint, often about halfway up, with stair-step cracks running toward the corners.
What are the warning signs?
- A long horizontal crack along a block or poured wall
- A wall that bulges in when you sight down it or hold a level against it
- Blocks sliding inward at the top of the wall, or a gap at the sill plate
- Stair-step cracks running diagonally toward the corners
- Doors upstairs that suddenly stick, along with any of the above
What bracing options are there?
| Method | How it works | Often used when |
|---|---|---|
| Steel I-beams | Vertical beams fastened to the floor and the floor framing above | Moderate bowing; some can be tightened over time |
| Wall anchors | Plates on the inside tied by rods to anchors buried in the yard | There's room outside to set the anchors |
| Carbon fiber straps | High-strength straps bonded to the wall face | Small amounts of movement, especially on poured walls |
| Excavate and rebuild | Dig outside, straighten or replace the wall | Severe movement or a wall that's failing |
Can a wall be pushed back straight?
Some systems let the contractor tighten the bracing over time to bring a wall back gradually, often in seasons when the soil is dry. Others are meant to hold the wall where it is. A wall that has moved a lot may need to be excavated from the outside and rebuilt.
Fix the water, too
Bracing handles the force, but the force usually comes from water. Pair it with downspout extensions, grading that slopes away, and drain tile where needed. For significant movement, ask whether a structural engineer should design the repair.
The waterproofing company prices the job after walking the basement, looking at the outside grading and finding where the water actually gets in. We don't quote prices, and any number given over the phone before a visit is only a rough starting point.
Where we connect you with help
Common questions
Is a bowing basement wall dangerous?
A small amount of bowing that has stopped moving isn't usually an emergency, but walls that are moving can get worse quickly, especially during spring thaw. Have it looked at, and track it with measurements in the meantime.
Do I need a permit or engineer for wall bracing?
That depends on the scope and your municipality. Some repairs are designed or reviewed by a structural engineer. Ask the contractor and check with your city or village inspections office.
Related services
- Basement waterproofing
- Interior drain tile and sump pumps
- Foundation crack repair
- Window wells and egress windows
More background: Eau Claire basement waterproofing guide.
Water on the basement floor, a damp wall or a sump that won't quit?
Call now and a local waterproofing company will help you find where the water is coming from.