We connect property owners in Pittsburgh and nearby areas, including Mount Washington, Polish Hill, Spring Hill, Lincoln Place, Bon Air and Lawrenceville, with one independent local foundation repair specialist.
Is your basement wall pushing in?
A bowing wall is a basement wall that bends inward in the middle. It is one of the most common foundation problems in older Pittsburgh homes. Here is how people describe it when they call:
"My block wall has a long crack running sideways across the middle."
"The wall bulges in. I can see it when I look down it."
"There is a stair-step crack and the wall leans."
"The top of the wall has slid in past the bottom."
"There is a gap where the wall meets the floor joists."
"Water comes in along the crack."
"The home inspector wrote 'bowing wall' in the report."
If you see any of these, have it checked. Bowing walls tend to get worse, and the fix is smaller when it is caught early.
Why basement walls bow in Pittsburgh
A basement wall holds back the soil around it. When that soil gets heavy or pushes harder, the wall bends. In Pittsburgh, several things make the soil push.
Wet, heavy soil. Pittsburgh set its rainfall record in 2018 at 57.83 inches, and heavy rain events are more common now than in the 1980s. Soaked soil weighs more and presses harder on the wall.
Clay on the hills. Many Pittsburgh hillsides have a clay-rich layer called the Pittsburgh red beds. Wet clay is slick and heavy. On a slope, it can creep downhill and press on the uphill wall of a house.
Freeze and thaw. Water in the soil freezes and swells in winter. That pushes on the top part of the wall, where the ground freezes. Then it thaws, and the cycle repeats all winter long.
Old walls. About half of the homes in the city were built before 1940. Many have block or brick basement walls. These walls are strong when weight presses down on them, but weaker when soil pushes from the side.
Water that is not drained away. Gutters that overflow, downspouts that dump at the wall, and yards that slope toward the house all add water to the soil right where it does the most harm.
How bowing walls get fixed
The right fix depends on how far the wall has moved, how much room there is outside, and whether you want to just stop the wall or try to pull it back.
Carbon fiber straps
Strips of carbon fiber are glued to the wall from floor to top, a few feet apart. They hold the wall in place. They are thin, neat and quick to install. They work best on walls that have moved about 2 inches or less. They stop the wall but do not straighten it.
Steel beams
Steel I-beams or channels are set against the wall, anchored to the floor and bolted to the floor joists above. They hold the wall and work when there is no room to dig outside, which is common on tight city lots and steep hills.
Wall anchors
A steel rod runs through the wall to a plate buried in the yard. A plate on the inside is tightened to hold the wall. Over time, the anchors can be tightened to help pull the wall back. They need open yard space outside, several feet from the wall.
Wall straightening or rebuilding
For a wall that has moved a lot, the crew may dig out the soil, push the wall back, brace it, and fill it back in. A wall that is too far gone may need to be rebuilt. This costs the most.
Drainage
Lowering the water in the soil lowers the push on the wall. An inside drain and sump pump, gutter fixes and better grading are often part of the plan. See basement waterproofing.
What bowing wall repair costs in Pittsburgh
Here are typical ranges from published cost guides. They are not quotes.
Repair
Typical range
Wall anchor, per anchor
About $400 to $1,000
Carbon fiber or steel strap, per strap
About $350 to $1,000
20-foot wall with wall anchors
About $1,600 to $2,800
20-foot wall with straps
About $1,700 to $5,000
Average bowing wall repair
About $4,500, with major repairs $10,000 or more
Wall straightening
About $6,700 to $11,000
Structural engineer visit
About $250 to $500
Price depends on the length of the wall, how far it has moved, whether the yard can be dug, and whether finished walls must come down first. Repainting or new drywall after the repair is extra. See the full Pittsburgh cost guide.
You get the price in writing before any work starts. No hidden fees.
Questions to ask before you hire
How far has the wall moved? Ask for a measurement, not a guess.
Will this stop the wall or straighten it? They are different jobs at different prices.
Why this method? Ask why straps, beams or anchors fit your wall and your lot.
Is drainage part of the plan? If not, ask why not.
What does the warranty cover? Get it in writing and ask if it transfers when you sell.
Is the contractor registered? Pennsylvania home improvement contractors must list their state registration number on every estimate and contract. Jobs over $500 need a written contract, and you can cancel within three business days.
Where we help
We connect homeowners with local crews for bowing wall repair across Pittsburgh and Allegheny County, including Spring Hill, Mount Washington, Polish Hill, Dormont, Bethel Park, Penn Hills, Shaler and Moon Township. See all service areas.
Get your wall checked for free
A bowing wall does not straighten itself. Each wet spring and hard winter pushes it a little more. Call (412) 990-2570 or send the short form, and a local crew will call you back to book a free inspection.
Frequently asked questions
How do I know if my basement wall is bowing?
Look for a long sideways crack along the middle of a block wall, a bulge you can see when you look down the wall, or a gap at the top where the wall meets the wood. Hold a long level or a string against the wall to check.
Is a bowing wall an emergency?
Most bowing walls move slowly, over years. If the wall moves fast, water pours in, or blocks start to fall out, call right away and stay out of that part of the basement.
Can a bowing wall be pushed back straight?
Sometimes. Wall anchors can be tightened over time to pull the wall back a bit. Big bows may need the soil dug out so the wall can be pushed back. Cost guides put wall straightening at about $6,700 to $11,000.
Which is better, carbon fiber straps or wall anchors?
Straps are less work and look neater, and they are best when the wall has moved about 2 inches or less. Anchors are used when the wall has moved more, and they need yard space outside. On a steep or tight Pittsburgh lot, beams braced to the floor and joists may be the better choice.
Why do so many walls bow in Pittsburgh?
Many homes have old block or brick walls, and much of the city is built on hills with wet clay soil. Soaked soil is heavy, and in winter it freezes and pushes. Over the years that pressure bends the wall in.
Do I need to fix the water too?
Usually yes. Water in the soil is what makes it push. Fixing gutters, downspouts, grading and adding an inside drain lowers the pressure on the wall and helps the brace last.
Will a bowing wall hurt the sale of my house?
Buyers' inspectors look for bowing walls. A repair with paperwork and a written, transferable warranty is usually easier to sell than a wall that has not been fixed.