A guide, not a service we sell

Foundation Repair Guide: Bowing Walls, Settlement, and Who to Call

Every foundation repair question comes down to one thing first: is it still moving? A crack that has sat still for twenty years and a wall that bowed another half inch since last spring need different people. Eau Claire Drainage & Waterproofing is a drainage contractor, not a structural repair company, so this guide has nothing to sell you on the structural side. It covers the signs, how to measure them, the repair methods, and the order to call people in.

Where does your house sit on this scale?

Level 1

Stable and cosmetic

A thin vertical crack in a poured wall that has not changed in years. Hairline cracks in a basement floor. Nothing sloping, nothing sticking.

Next step: Mark it, date it, photograph it. Seal it only if it leaks.
Level 2

Worth measuring

A stair-step crack in block, a crack that tapers, a door upstairs that has started to rub, a floor that feels slightly off.

Next step: Start a monitoring record and check it each season.
Level 3

Engineer soon

A horizontal crack along a block joint or across a poured wall, a wall you can see bowing with a straightedge, a crack that is wider than it was last year.

Next step: Book a structural engineer before any contractor.
Level 4

Engineer now

A wall that has slid in at the bottom, blocks pushed out of line, a bow that grows month to month, doors and windows going out of square fast.

Next step: Call an engineer this week and keep clear of the wall.

A rough guide for deciding who to call first, not a diagnosis. Two signs at different levels? Go by the higher one.

Walls

Bowing Basement Walls: What Pushes a Wall In

A basement wall is a retaining wall with a house on top. Soil leans on the outside face all the time, the floor slab holds the bottom, and the floor framing holds the top. When the load outside outgrows what the wall can carry, it gives in one of a few recognizable ways, and the way it gives decides which repair an engineer will consider. The drawing shows the three patterns this guide keeps coming back to.

Simplified and not to scale. Amber arrows show the force; the dashed blue line shows where the wall or footing started.

Horizontal cracks and inward bowing in block and poured walls

A bowing wall usually announces itself with a horizontal crack: along a mortar joint about halfway up a block wall, or across a poured wall at a similar height. InterNACHI's inspection manual calls horizontal cracking potentially serious because it means the wall itself is bent or broken, and it advises recommending a structural engineer when masonry walls show it. Block walls often add stair-step cracks running from the ends of the horizontal one toward the corners. How to tell a leak-path crack from a structural one is covered on our crack repair page; here the crack matters as evidence that the wall is moving.

Shear at the base: a wall sliding in at the footing

Sometimes the wall stays straight and the bottom slides instead: the lowest course of block or the base of a poured wall shifts inward off the footing along a horizontal joint, while the joists keep the top in place. It shows as a step at the base you can feel with your hand. Bracing manufacturers list sheared walls as a separate condition from bowed ones, and it ranks high on the scale above because the wall has lost its grip on its footing.

Saturated soil, frost and lateral earth pressure

Three things make soil push harder. Water first: design codes compute the load on a foundation wall below the water table as the weight of the soil reduced by buoyancy plus full hydrostatic pressure, and wet clay presses harder than sand. Frost second: Canada's National Research Council describes heaving pressure in freezing soil gripping a foundation through the adfreeze bond, and InterNACHI notes that frost heaving may be the culprit when damage sits above local frost depth. Backfill third: InterNACHI lists improper backfilling among the causes of horizontal cracks. Around Eau Claire, snow sits on the ground more than three months in a normal winter and then melts over ground that is still frozen, so the backfill beside a wall is at its wettest exactly when frost is still in it.

Stone, rubble and older block foundations

About one in six Eau Claire homes predates 1940, and in the Third Ward and around Randall Park that can mean stone or rubble laid in soft lime mortar. Those walls rarely crack in one clean line. They bulge in sections, joints wash out, and stones loosen. InterNACHI's manual notes that when large areas or whole walls lean, rebuilding the wall, and possibly the foundation, may be the only answer. Anchors and straps designed for block and poured concrete are not automatically suited to a rubble wall, which is one more reason the engineer chooses the method.

Footings

Foundation Settlement: Sloping Floors, Sticking Doors, Stair-Step Cracks

Settlement is the footing moving down, usually unevenly. A house that settles evenly rarely shows it; one corner dropping is what cracks walls and racks door frames. The third drawing above shows the pattern.

Signs of a settling foundation inside the house

InterNACHI lists the classic set: sloped floors, sticking doors and windows, warped openings, and distorted, cracked masonry. In practice that means a marble that rolls one way, drywall cracks running diagonally from the corners of doors and windows, gaps opening between trim and wall or between a ceiling and an exterior wall, and a door whose latch no longer meets the strike. One of these alone is often seasonal wood movement. Several clustered at one end of the house point at the foundation below them.

Stair-step cracks in exterior brick and block

Settlement cracking in masonry usually follows a rough diagonal path along the mortar joints, stepping up and away from the low point. Look at brick veneer outside and the block wall inside at the same corner. InterNACHI also warns that shrinkage cracks in block can run diagonally upward and are often mistaken for settlement, which is why a crack that is wider at one end, offset across its faces, or growing over time tells you more than its shape.

Why foundations settle on Chippewa Valley ground

InterNACHI's list of settlement causes includes consolidation of soil under the footings, frost heave, soil eroded from around footings by poor surface drainage, faulty drains or leaking water lines, and compaction from vibration. Most of Eau Claire stands on fast-draining sandy outwash, not the shrink-swell clay that drives foundation movement in much of the country, so here the usual suspects are loose or poorly compacted fill and backfill, and soil washed out by a downspout or a leak running at one corner. The ridges around the valley are silt loam over sandstone that drains slowly, and around Stanley the ground is dense glacial till; both hold water against a foundation longer than valley sand.

Frost heave under shallow footings

Frost can lift as well as push. Wisconsin's dwelling code, SPS 321.16, puts footings below the frost penetration level or at least 48 inches below grade, whichever is deeper. That code covers homes begun on or after June 1, 1980; older houses were built to whatever practice the builder followed, and a porch, stoop or older addition may not sit on footings that deep. A shallow footing in wet soil can heave each winter and drop each spring, which reads as a crack that opens and closes with the seasons.

Measure first

How to Measure and Monitor Foundation Movement

The difference between a wall that moved once, decades ago, and a wall that is moving now is the most expensive question in foundation repair, and a homeowner can start answering it this weekend with a string, a level and a phone. Measure at the same points every few months, and especially before and after the spring melt.

Bow, with a string line. Fasten a mason's string tight from the top of the wall to the bottom, or hold a long straightedge vertically, at the worst spot and at both ends of the bowed section. Measure from string to wall at mid-height. Mark the exact spot on the wall so next season's reading is taken in the same place.
Lean, with a level or plumb bob. A 4-foot level held against the wall, or a plumb bob hung from the top, shows whether the whole wall tips in. Record the gap at the bottom of the level, not just "out of plumb."
Cracks, with dated marks or a gauge. Pencil a short line across each end of the crack with the date. For a better record, InterNACHI's manual describes commercially available joint movement indicators, plastic crack gauges fixed across the crack, and notes that cyclical movement may take six months or more to measure.
Floors, with a level or a laser. Note how far a long level is off across the same room each season, or shoot a few marked points with a laser level.
Photos, with a ruler in the frame. Same spot, same angle, a tape measure in the shot, the date in the file name. A season-by-season set is the first thing an engineer will ask for.
Doors and windows. Note which ones start to stick and when. Sticking in humid August and freeing up in January is often just the wood; sticking that gets worse every year is not.

A record like this does not replace an engineer. It makes the engineer's visit shorter, and it turns "I think it got worse" into a number.

Repair types

Foundation Repair Methods Compared

There are two families of foundation repair: methods that hold back a wall that is being pushed in, and methods that support a footing that is going down. Descriptions here come from engineering and inspection references and from manufacturers' own product literature, and they explain what each method is, not which one your house needs. We install none of them.

Common foundation repair methods: what each does, where it tends to fit, its limits, and whether the outside of the wall gets dug up
Method	What it is	When it tends to fit	Limits	Excavation
Wall anchors (plate anchors)	A steel plate buried in the yard, a steel rod through the wall, and a plate on the inside face, tightened against each other.	Bowed block or poured walls with open yard outside the wall.	Needs clear yard space outside, free of decks, drives and utilities; the manufacturer says periodic retightening offers a chance to recover inward movement.	Small holes in the yard only
Steel I-beam wall braces	Vertical steel beams against the inside face, anchored to the floor slab and bolted to the floor joists.	Bowed, leaning and sheared walls, especially where the yard is not accessible.	Beams stand in the room, and the framing above must be able to take the load, which the engineer checks. The manufacturer says some systems can improve a wall's position over time.	No
Carbon fiber straps	Carbon fiber reinforcement bonded to the inside face with epoxy, anchored at the top and bottom.	Walls with limited inward movement that is not progressing quickly.	Holds a wall where it is; does not straighten it. Not for walls that have moved a lot or slid at the base. Manufacturers set deflection limits; the engineer decides if the wall is within them.	No
Excavate and straighten or rebuild	Digging out the outside of the wall, pushing it back or tearing it down and rebuilding it, then backfilling with drainage.	Large deflection, sections that lean badly, failing stone or rubble walls.	The most disruptive and usually the costliest; landscaping, walks and decks come out. It is also the chance to add exterior waterproofing and a footing drain.	Yes, full depth
Push piers (resistance piers)	Steel pipe sections driven down beside the footing, using the weight of the house as the reaction, to a firm bearing layer; a bracket carries the footing.	Settlement of a heavy structure where a firm layer is within reach.	Needs enough structure weight to drive against; digging at each pier location.	At each pier
Helical piers	Steel shafts with helix plates screwed into the ground; installation torque is used to verify capacity.	Settlement, including where a structure is too light to drive push piers against.	Capacity comes from the soil the helix plates reach; an engineer specifies the depth and torque.	At each pier
Slab piers, mudjacking and foam lifting	Piers under an interior slab, or grout or expanding polyurethane pumped under a sunken slab to lift it.	Sunken basement or garage slabs, steps and walks, not bearing walls or footings.	Lifting a slab does not fix the soil or water that dropped it.	No

Wall anchors and steel I-beam braces for bowed walls

Both resist the soil from the inside face. An anchor reaches out into undisturbed soil in the yard; a brace transfers the load down to the floor and up into the framing. Supportworks, one manufacturer, describes its anchor plate as buried an appropriate distance from the wall, connected by steel rods, and its brace as designed for bowed, leaning and sheared walls. Which one fits depends on the yard, the framing above and the condition of the wall.

Carbon fiber straps and their limits

Carbon fiber is the least intrusive option and the one most often oversold. Installers themselves say straps do not straighten a wall; they secure it where it is. They also depend on a sound bond to the wall and on the top and bottom connections, so a wall that has slid at the base, crumbles, or has already moved a long way is not a strap candidate. The deflection limits vary by product, and published installer guidance does not agree on a single number, so treat any quoted cutoff as the engineer's call.

Push piers vs. helical piers for foundation settlement

Both underpin a footing: they extend its support down past the problem soil to a layer that can carry it. A push pier is driven hydraulically, using the weight of the house as the reaction, until it reaches a firm stratum. A helical pier is screwed in, and its makers state that installation torque is used to verify its capacity, which lets it work where there is little weight to push against. Helical piles are evaluated under the ICC-ES acceptance criteria AC358. InterNACHI notes that some settlement can only be corrected by underpinning; an engineer decides whether that applies and how many piers it takes.

Slab lifting: mudjacking and polyurethane foam

Mudjacking, also called slabjacking, pumps a slurry under a sunken slab to raise it; InterNACHI lists sand, cement, soil, limestone and other mixes. Foam lifting does the same with expanding polyurethane. Both are for slabs, not for walls or footings, and both leave the cause in place. A slab that sank because water washed the sand out from under it will keep sinking until the water goes somewhere else.

Who to call

Foundation Repair Companies: Who to Call First and How to Choose

Searching "foundation repair near me" mostly turns up companies that sell and install repair systems, and many offer free inspections. That is not dishonest, but an inspection from a company that installs one kind of repair is not independent. For a wall or footing that is moving, the order below protects you.

Foundation signs by likely cause, the repair types usually considered, and who should assess each first
What you see	Likely cause	Repair types usually considered	Who assesses it
A thin vertical crack, stable for years	Concrete shrinkage	None; inject only if it leaks	You; a drainage contractor if it leaks
A horizontal crack; a wall bowing in	Lateral soil and water pressure, frost	Anchors, braces, carbon fiber, or excavation, plus drainage	A structural engineer
The base of the wall slid in at the footing	Lateral pressure at the bottom of the wall	Bracing or excavation and rebuilding, plus drainage	A structural engineer, soon
Stair-step cracks, sloping floors, sticking doors at one end	Settlement of the footing	Push or helical piers, or no repair if it has stopped	A structural or geotechnical engineer
A crack that opens in winter and closes in summer	Frost heave under a shallow footing	Depends on the footing; drainage and grading first	A structural engineer
A sunken basement or garage slab	Fill that settled or washed out	Mudjacking, foam, or slab piers	An engineer if walls or posts bear on it

A starting point, not a diagnosis. The repair column describes options an engineer may weigh, not a recommendation.

Measure

Start the record above. A few weeks of dated measurements is enough to bring to the first appointment.
Engineer

Hire a licensed structural engineer for an assessment and a written repair design. The engineer sells no product.
Bids

Give the same design to two or three contractors so every bid prices the same repair, and check credentials.
Water

Fix the drainage that loaded the wall, as part of the plan, so the repair is not fighting the same pressure.

Why a structural engineer goes before foundation repair contractors

InterNACHI's standards say home inspectors are not required to provide engineering services or repair estimates, and its manual advises recommending a structural engineer when masonry walls show structural problems. An engineer measures, determines whether the movement is active, and writes the repair: which method, how many anchors, braces or piers, and to what depth. That report costs money and sells nothing. It also gives you something to hand a buyer later, since the Wisconsin Real Estate Condition Report (Wis. Stat. 709.03) asks about known defects in the basement or foundation, naming cracks, seepage and bulges.

Wisconsin licenses and permits for foundation repair

Professional engineers in Wisconsin are licensed by the Department of Safety and Professional Services under Wis. Stat. ch. 443, and DSPS credentials can be checked through its online License Lookup. A business that obtains a building permit for a one- or two-family home must hold a Dwelling Contractor certification under SPS 305.31. The City of Eau Claire says a permit is needed for structural alterations to existing buildings, and Wisconsin's home improvement rule, ATCP 110.03, requires the seller to tell you which permits a job needs before you sign and not to start work until they are issued.

What a written foundation repair bid should state

Under ATCP 110.05, a home improvement contract must be in writing whenever you pay anything before the work is finished, and it must list the seller's name and address, a description of the work and principal materials, the total price, start and completion dates, any security interest, and any warranty. For foundation repair, also look for: whose design the bid follows; the number, spacing and type of anchors, braces, straps or piers; target pier depth or torque; whether the wall will be straightened or only stabilized; who restores the yard, slab and finished walls; what the warranty covers and whether it transfers when you sell; and what drainage work is included or excluded.

Questions for any foundation repair company

Is your recommendation based on an engineer's design, and if not, will you build to one? Is the movement active, and how do you know? What happens to the water that loaded this wall? What is the smallest repair that would work here, and why is it not enough? Can I see proof of insurance and your Dwelling Contractor certification? A company that answers the water question with "it's not our department" is telling you to plan that part separately.

Cost

Foundation Repair Cost: What Moves the Price

For a national frame of reference, This Old House's foundation repair cost guide (updated October 8, 2026) puts the national average at $5,179, with most homeowners paying between $2,224 and $8,134. That is a national average across every kind of repair, not a local price and not ours, since we do not do this work. A single stabilized wall and a house on a dozen piers are different jobs, and the number that matters is the one bid against an engineer's design.

What moves it: the type of movement, since stopping a bowing wall and underpinning a settling footing are different repairs; the amount, because a wall that must be excavated and straightened costs far more than one that only needs holding; how many anchors, braces, straps or piers the design calls for, and for piers, how deep firm soil is; access, including yard space for anchors, finished walls and stored belongings inside, decks and drives outside; the engineer's fee and permits; restoring landscaping, slabs and finishes; and the drainage that should go in alongside. The water side is the part we price, and our waterproofing cost guide sets out what the national guides publish for it.

Where we fit

Why Foundation Repair Has to Include the Water

Most bowing walls and a good share of settlement start with water: soil saturated against a wall, or sand washed out from under a corner. Stabilize the wall and leave the water, and the brace or anchor carries the same load every spring melt. InterNACHI notes that a wall can be relieved of some lateral pressure by lowering the ground level around the building, and draining the soil does more of the same. This is the part of a foundation repair plan we do.

Grading and downspout routing, and yard drainage that carries roof and surface water away
French drains that intercept water headed for the wall
Interior drain tile with a sump pump, through our basement waterproofing work
Exterior waterproofing and a footing drain when a wall is dug out anyway
Injection of cracks that leak but are not moving

What we will not do is call a moving wall a drainage problem. If the inspection turns up a horizontal crack, a bow, a sheared base or signs of settlement, we will say so and point you to an engineer before quoting anything. If the engineer's plan calls for drainage alongside the structural repair, that part is work we can bid, and timing it with the structural contractor saves digging the same trench twice. When the wall is coming out of the ground for excavation anyway, that is the cheapest moment the outside of it will ever be exposed.

Straight talk

Low-Cost Steps Before Any Foundation Repair

Some of the most effective work on a loaded foundation costs less than an engineer's visit, and none of it needs us. Do these first, and keep measuring.

Extend every downspout. A downspout emptying at the wall soaks the backfill at exactly the spot a corner settles or a wall bows. Extensions cost little and work the same day.
Clean the gutters. An overflowing gutter dumps a roof's worth of water along the whole wall, and fall leaves make it worst just before freeze-up.
Rebuild the slope. Wisconsin's dwelling code, SPS 321.12, calls for finished grade sloping away from the house at least 1/2 inch per foot for at least 10 feet. Settled backfill and mulch beds piled against the siding undo that on plenty of older lots.
Find the wet corner. Walk the house in a hard rain and during the melt. Water pooling, a leaking hose bib or a washout at one corner is the cheapest settlement cause to fix.
Keep the measurements going. After the water is redirected, a wall that stops moving tells the engineer something useful, and so does one that keeps going.

None of this repairs a wall that has already bent, slid or settled. It slows the next round, and it is the same work any structural repair should be paired with.

FAQ

Foundation Repair Questions

Do you do foundation repair?

No. We do not install wall anchors, steel braces, carbon fiber straps or piers, we do not excavate to straighten or rebuild walls, and we do not lift slabs. That work should follow a structural engineer's design and be built by a contractor who does it. What we do is the water side: grading and downspouts, yard drainage, French drains, interior drain tile and sump pumps, exterior waterproofing when a wall is dug out, and injection of cracks that leak but are not moving. If an engineer's plan calls for drainage alongside the structural repair, we can bid that part.

Is a bowing basement wall an emergency?

Usually not overnight, but it is not something to leave for years either. InterNACHI calls horizontal cracking potentially serious because it means the wall is bent or broken, and its material advises recommending a structural engineer. A wall that is still moving, one that has slid in at the base, or one leaning past what an engineer considers stable needs that assessment soon. Start a dated record of the crack and the bow today so the engineer has something to work with.

Can a bowed basement wall be pushed back straight?

Sometimes, partly. Manufacturers describe wall anchors and some steel brace systems as able to improve a wall's position over time through periodic tightening, carbon fiber straps hold a wall where it is without straightening it, and a wall that has moved a lot may have to be excavated and straightened or rebuilt. How much recovery is realistic is a question for the engineer, not a sales promise.

Will fixing drainage stop a wall from bowing?

It removes much of the load, but it does not undo movement that has already happened. InterNACHI notes a wall can be relieved of some lateral pressure by lowering the ground level around the building, and drier soil pushes less than saturated soil. A wall that has bent or slid still needs an engineer's decision on whether it must be stabilized. Drainage is the half that keeps a stabilized wall from fighting the same load every spring.

Does a foundation repair job need a permit in Eau Claire?

Often, yes. The City of Eau Claire says a building permit is needed for structural alterations to existing buildings, and Wisconsin's home improvement rule requires the contractor to tell you which permits a job needs before you sign and not to start until they are issued. Ask the city's inspections office about your specific repair, and make the permit part of the written contract.

Free drainage inspection

Have the Water Side Checked, Free

We inspect the drainage and water side of a foundation at no charge: grading, downspouts, drain tile, sump and leaks. This is not a structural inspection. If we see signs of movement, we will tell you to get a structural engineer before anyone quotes a repair, us included.

Call 715-953-0369