# Foundation Crack Repair in Cincinnati: Structural vs Cosmetic Cracks > Diagnose and repair foundation cracks in Cincinnati. Learn the difference between hairline shrinkage cracks and active structural settlement. Canonical: https://cincinnati.groundlevelgrowth.io/foundation-crack-repair/ Updated: 2026-09-28 Phone: (555) 555-0100 Identify whether your basement or foundation crack is cosmetic drying shrinkage or an active sign of foundation movement in Cincinnati clay. ## Diagnosing Foundation Cracks in Greater Cincinnati Homes Discovering a crack in a basement wall or foundation stem creates immediate concern for any homeowner. In the Greater Cincinnati region, where housing stock spans century-old stone foundations in historic riverfront communities to modern poured concrete in Butler and Warren counties, foundation cracks are exceptionally common. However, concrete and masonry cracks represent two entirely distinct categories of problems: 1. **Non-Structural / Cosmetic Cracks:** Flaws caused by intrinsic concrete drying shrinkage, curing thermal stress, or minor surface settlement. These fractures do not compromise the load-bearing capacity of the wall, though they frequently permit groundwater seepage into living and storage areas. 2. **Structural Foundation Cracks:** Manifestations of active structural failure caused by external soil pressures, differential foundation settlement, footing rotation, or frost heave. These cracks compromise the structural stability of the home and will progressively widen unless the underlying geotechnical and structural forces are arrested. Accurate diagnosis is the foundational first step. Applying a cosmetic patch or rigid epoxy to an actively moving wall will inevitably fail, leading to re-cracking and compounding damage. The orientation, width, location, and planar alignment of a crack reveal the specific forces acting on the foundation. --- ## Concrete Wall Crack Classification: Patterns and Structural Significance Foundation walls in Cincinnati are predominantly either **poured reinforced concrete** or **concrete masonry units (CMU / cinder block)**. The geometry and pattern of a fracture provide definitive forensic clues regarding its underlying cause.
Vertical Hairline Cracks Poured Concrete Curing Shrinkage

Non-structural curing shrinkage fractures occurring within the first few years of construction. Best treated with flexible polyurethane injection to permanently seal against water infiltration.

Horizontal Mid-Height Cracks Lateral Soil Hydrostatic Pressure

Severe structural distress caused by expansive clay push. Indicates inward wall flexure requiring carbon fiber strap or structural steel reinforcement.

Stair-Step Mortar Joint Cracks Differential Footing Settlement

Occurs along CMU block mortar lines when one section of the foundation footing settles. Requires deep hydraulic piering to bedrock to halt movement.

### 1. Vertical Cracks (Poured Concrete Walls) Vertical cracks run essentially straight up and down, within 30 degrees of vertical. In poured concrete foundations, vertical cracks are by far the most frequent occurrence. * **Primary Mechanism:** As freshly placed concrete cures, water evaporates, causing the matrix to shrink in volume. Because the concrete is restrained at the bottom by friction against the footing and at the top by mudsills and floor framing, tensile stresses develop within the wall. Once tensile stress exceeds the tensile strength of the young concrete (typically 300 to 400 psi), vertical relief cracks form—often near the center of a continuous wall segment or radiating from snap-tie rod locations. * **Structural Risk:** Generally low. A vertical hairline crack (less than 1/16 inch wide) that does not leak and exhibits no planar offset is structurally stable. * **Action Threshold:** Vertical cracks become structural concerns if they exceed 1/4 inch in width, exhibit planar shear (one side of the crack protrudes inward past the other), or widen significantly from top to bottom, indicating localized footing settlement. Even non-structural vertical cracks require waterproofing remediation if groundwater penetrates during rainfall. ### 2. Horizontal Cracks (Lateral Flexural Failure) Horizontal cracks run parallel to the basement floor, typically occurring midway up the foundation wall between the third and fifth courses of a block wall, or roughly 3 to 4 feet below grade in a poured concrete wall. * **Primary Mechanism:** Foundation walls function structurally as vertical structural slabs supported at the base by the concrete footing and pinned at the top by the first-floor floor joist diaphragm. Unbalanced lateral soil pressure and accumulated hydrostatic water pressure push inward against the exterior face of the wall. The maximum bending moment occurs near mid-height. When inward lateral pressure overcomes the flexural strength of the concrete or masonry, the wall fractures horizontally and begins to bow inward. * **Structural Risk:** Severe. Any horizontal crack must be treated as an active structural failure until professionally evaluated. Unaddressed horizontal fractures lead to inward wall rotation, shearing at the base course, and potential structural collapse under heavy saturated soil loads. * **Action Threshold:** Immediate stabilization. Horizontal cracking accompanied by more than 1/2 inch of inward wall deflection requires engineered reinforcement, such as carbon fiber straps, structural steel beams, or helical tiebacks. ### 3. Diagonal and Re-Entrant Corner Cracks Diagonal cracks propagate across the foundation face at approximately a 45-degree angle. They frequently originate from the lower or upper corners of basement window openings, walk-out access doors, or beam pocket cutouts. * **Primary Mechanism:** Openings in concrete walls create natural geometric stress concentrations (re-entrant corners). Minor diagonal fractures under 1/16 inch radiating from window corners are often secondary drying shrinkage artifacts. However, diagonal cracks that extend continuously from grade level down to the footing indicate **differential settlement**—where one corner or section of the footing has subsided into soft or under-compacted subgrade while the adjacent section remains firmly supported. * **Structural Risk:** Moderate to high. If the crack is accompanied by sticking interior doors, sloping upper floors, or diagonal drywall cracks on upper levels, the foundation footing is actively sinking. * **Action Threshold:** Professional monitoring. If the crack width is tapered (noticeably wider at the top than the bottom) or widening across seasons, underpinning with structural steel push piers or helical piers is necessary to halt settlement. ### 4. Stair-Step Cracks (CMU and Concrete Block Walls) Stair-step cracks follow the horizontal bed and vertical head mortar joints of concrete block or brick foundation walls, resembling a staircase moving up or across the wall. * **Primary Mechanism:** Mortar joints have significantly lower tensile and shear strength than the concrete masonry units themselves. When external stresses act on a block wall, failure concentrates along the mortar line. Stair-step cracking results from either differential settlement beneath one end of the foundation wall or inward deflection caused by lateral soil pressure before the block faces fracture. * **Structural Risk:** Moderate to critical. Symmetrical stair-step cracks radiating downward from opposite corners toward the center of a wall indicate center sagging, whereas a single stair-step pattern at one corner indicates that the corner footing is dropping. * **Action Threshold:** Any stair-step separation exceeding 1/4 inch, any displacement where block faces slip off their mortar bed, or any stair-step crack terminating in a horizontal joint fracture demands structural remediation. ### Foundation Crack Diagnostic Matrix | Crack Profile | Typical Substrate | Primary Underlying Cause | Structural Severity | Primary Remediation Path | | :--- | :--- | :--- | :--- | :--- | | **Hairline Vertical (< 1/16")** | Poured concrete | Autogenous drying shrinkage | Negligible | Monitor; seal if moisture occurs | | **Wide Vertical (> 1/8" - 1/4")** | Poured concrete | Shrinkage combined with localized settlement | Low to Medium | Low-pressure polyurethane injection; carbon fiber staples if active | | **Offset Vertical (Shear Lip)** | Poured concrete | Differential footing movement | High | Structural epoxy injection + carbon fiber stitching / piering | | **Horizontal Mid-Wall** | Block or poured | Hydrostatic pressure & lateral soil thrust | Critical | Carbon fiber straps, steel I-beams, or wall anchors | | **Diagonal Re-Entrant** | Poured concrete | Stress concentration at wall openings | Low to Medium | Polyurethane injection; monitor for foundation settlement | | **Continuous Diagonal** | Poured or block | Differential foundation footing settlement | High | Helical or hydraulic steel push piers | | **Stair-Step Mortar Joint** | Block / Masonry | Footing subsidence or lateral bowing | Medium to High | Tuck-pointing if stable; carbon fiber / piers if active | | **Basement Slab Crack** | Interior floor slab | Sub-slab settling or soil shrinkage | Low (Non-load bearing) | Elastomeric joint seal; polyjacking if slab has dropped | --- ## Hydrostatic Pressure and Southwest Ohio Soil Mechanics Foundation problems in Greater Cincinnati are inextricably linked to the region's distinctive geological formation and climatic profile. Understanding the soil mechanics of southwestern Ohio explains why foundation cracks develop and why water intrusion is so pervasive.
Cincinnati Soil Physics: Expansive Ordovician Kope Formation clay-shale absorbs seasonal Ohio Valley precipitation, expanding in volume and generating lateral pressures of 300 to 600 psf against basement walls. During summer drought, rapid desiccation causes soil shrinkage and differential footing drop.
### 1. The Geotechnical Profile: Ordovician Shales and Glacial Till The Cincinnati metropolitan area rests upon the bedrock of the Cincinnati Arch, dominated by alternating beds of limestone and **Ordovician shale** (most notably the Kope, Fairview, and Bellevue formations). Overlying this bedrock is a dense layer of Wisconsinan and Illinoian glacial till, capped by heavy, fine-grained cohesive clay soils. These native clays possess a high Plasticity Index (PI) and contain active clay minerals (illite and smectite) that exhibit pronounced **shrink-swell behavior**: * **Desiccation Shrinkage (Summer):** During hot, dry summer months, clay soils lose moisture and contract significantly, pulling away from exterior foundation walls and creating subterranean fissures up to several inches wide. * **Expansive Swelling (Spring & Fall):** When prolonged rains or winter snowmelts saturate the soil, the clay minerals absorb water into their crystal lattices, expanding by 10% or more in volume. This expansion generates lateral swelling pressures that can exceed 8,000 to 12,000 pounds per square foot against rigid basement walls. ### 2. Hydrostatic Head Pressure Mechanics Water weighs 62.4 pounds per cubic foot. When downspouts discharge near foundation corners, exterior soil slopes inward toward the house, or perimeter drain tiles become crushed or clogged with clay silt, groundwater accumulates in the loose backfill zone around the basement. Because water cannot drain rapidly through the dense native clay subsoil, it builds up into a column of trapped water—known as **hydrostatic head**. Hydrostatic pressure exerts continuous lateral and vertical force against the exterior concrete: 1. **Lateral Wall Infiltration:** Hydrostatic pressure searches for every flaw in the exterior waterproofing membrane, exploiting cold joints, form-tie penetrations, and hairline shrinkage cracks to force groundwater into the basement. 2. **Floor-Wall Cove Joint Seepage:** Water tables rise beneath the basement floor, driving water upward through the cove joint (the junction where the poured floor slab meets the footing and perimeter wall). ### 3. Freeze-Thaw Cycling and Frost Heave Cincinnati's winter climate oscillates frequently around the freezing point, producing 40 to 60 freeze-thaw cycles annually. In southwestern Ohio, the municipal building code establishes a minimum foundation frost depth of **30 inches** below grade. When saturated soil within the top 30 inches freezes, moisture forms growing ice lenses that expand by roughly 9% in volume. If foundation footings are improperly seated, or if exterior uninsulated patios and stoops adhere to foundation walls through "adfreezing," frost heave lifts and shears the upper courses of the foundation. During the subsequent spring thaw, the support collapses, generating severe diagonal shear fractures. --- ## Injection Methodologies: Polyurethane Foam vs. Structural Epoxy For poured concrete foundation walls, high-pressure and low-pressure chemical injection represents the industry standard for repairing vertical, diagonal, and non-moving settlement cracks. However, selecting the incorrect injection resin leads to premature failure. Contractors and homeowners must understand the strict engineering distinction between **polyurethane** and **epoxy**.
Polyurethane Expanding Foam Water Stop & Flexible Gasket
Structural High-Modulus Epoxy Monolithic Concrete Weld (ASTM C881)
### 1. Polyurethane Foam Injection (Water-Stopping Seal) Polyurethane injection is primarily an elastomeric, non-structural waterproofing solution. * **Chemistry and Reaction:** Polyurethane resins are single-component or two-component prepolymers that react chemically with water present inside the crack. Upon contact with moisture, the resin rapidly expands into a dense, closed-cell micro-cellular foam, expanding to 20 to 30 times its original liquid volume within minutes. * **Hydrophobic vs. Hydrophilic Formulations:** * *Hydrophobic Polyurethanes:* Require only a trace amount of moisture to trigger polymerization. Once cured, they maintain constant volume and are completely unaffected by subsequent wet/dry cycles. Hydrophobic foam is ideal for residential basements that experience wet springs and dry late summers. * *Hydrophilic Polyurethanes:* Absorb water during expansion, creating an elastic gel-like seal. However, in prolonged drought periods, hydrophilic gels can dehydrate and shrink, potentially allowing water bypass when heavy rains return. * **Engineering Advantages:** Polyurethane remains permanently flexible. As the concrete wall expands and contracts under seasonal temperature swings, the elastomeric foam gasket compresses and rebounds without breaking its bond with the concrete pore structure. It can be injected directly into actively gushing cracks. * **Limitations:** Polyurethane provides **zero structural reinforcement**. It possesses virtually no tensile or shear capacity and cannot stop an actively bowing, rotating, or settling wall. ### 2. Structural Epoxy Injection (Monolithic Concrete Bonding) Epoxy injection is an engineered structural repair designed to restore the mechanical and structural integrity of cracked concrete, as detailed in American Concrete Institute guidelines ([ACI RAP-1](https://www.concrete.org)). * **Chemistry and Physical Properties:** Structural injection epoxies are 100% solids, two-component thermosetting resins compliant with **ASTM C881 (Type IV, Grade 1)** specifications for load-bearing applications. Cured structural epoxy exhibits: * Tensile Strength: 7,000 to 9,500 psi (compared to ~400 psi tensile capacity of concrete). * Compressive Yield Strength: 10,000 to 14,000 psi (over 3 times stronger than 3,000–4,000 psi residential concrete). * Shear Bond Strength: Exceeds 2,000 psi, ensuring that failure under subsequent stress occurs within the concrete substrate rather than at the bond line. * **Low-Viscosity Capillary Penetration:** Epoxies are formulated in ultra-low viscosity grades (down to 200–500 cps, similar in consistency to light motor oil) that penetrate microscopic fissures as narrow as 0.002 inches (0.05 mm) via capillary action and sustained injection pressure. * **Engineering Advantages:** Restores monolithic structural continuity. The two sides of the cracked concrete wall are welded together into a single structural element capable of transferring compressive, tensile, and shear loads. * **Limitations:** Structural epoxy is rigid. If the underlying cause of movement—such as active soil settlement or unmitigated lateral hydrostatic pressure—remains unaddressed, the concrete will simply fracture immediately adjacent to the rigid epoxy bond. Furthermore, standard structural epoxies have reduced adhesion on actively wet surfaces and require specialized moisture-tolerant formulations if the crack cannot be dried. ### Injection Comparison Table | Parameter | Polyurethane Foam Injection | Structural Epoxy Injection | | :--- | :--- | :--- | | **Primary Engineering Purpose** | Flexible water stop / moisture barrier | Structural rebonding & load restoration | | **Tensile & Compressive Strength** | Low / Non-structural elastomeric | 7,000+ psi tensile / 10,000+ psi compressive | | **Flexibility / Elongation** | High (accommodates thermal movement) | Rigid (zero flexibility; high modulus) | | **Performance in Active Water** | Excellent (requires water to catalyze) | Poor (requires dry or damp-tolerant formula) | | **Expansion Ratio** | 20x to 30x volumetric expansion | 1:1 (zero volumetric expansion) | | **Minimum Crack Width** | 1/16 inch (0.06") | 0.002 inch (0.05 mm) | | **Ideal Application** | Leaking vertical shrinkage cracks | Stationary structural cracks, dry settled walls | --- ## Structural Stabilization: Carbon Fiber Stitching and Reinforcement When a foundation crack is caused by active lateral earth pressure or differential movement, chemical injection alone is insufficient. The structural deficit must be bridged and reinforced. In modern foundation engineering, **Carbon Fiber Reinforced Polymers (CFRP)** have largely superseded bulky steel beams for non-sheared residential wall stabilization.
Cross-Crack Tensile Staples Recessed Carbon Fiber Grid Staples

High-tensile carbon fiber staples bedded in structural epoxy bridge fracture lines, preventing lateral widening and shear displacement under vibration or seasonal soil stress.

Vertical Wall Reinforcement CFRP Straps with Top & Bottom Anchors

Continuous floor-to-sill carbon fiber reinforced polymer straps permanently arrest inward wall flexure and bowing, anchored mechanically into the floor slab and top sill plate.

### 1. Carbon Fiber Crack Stitching (CFRP Grid Staples) When a poured concrete wall exhibits structural fractures that threaten to displace laterally or widen under shear loads, technicians install **carbon fiber grid staples** across the crack face: * **Installation Method:** Cross-slots (roughly 1/2 inch wide and 12 inches long) are ground horizontally across the crack at 12- to 18-inch vertical increments. Carbon fiber grid staples, composed of continuous aerospace-grade carbon filaments embedded in a vinyl ester or epoxy matrix, are inserted into the slots and encapsulated in high-strength structural anchoring epoxy. * **Load Transfer Mechanism:** The ultimate tensile strength of carbon fiber exceeds 500,000 psi—approximately ten times the tensile strength of standard structural steel. As tensile forces attempt to pull the crack apart, stress transfers into the carbon fiber stitching, locking the fracture in place and preventing planar displacement. ### 2. Vertical Carbon Fiber Straps (Bowing Wall Stabilization) For horizontal cracks and inward deflection in concrete block or poured walls, vertical carbon fiber straps provide permanent flexural reinforcement: * **Application Criteria:** Ideal for foundation walls with inward deflection or bowing of up to 2 inches where the bottom course has not sheared off the footing. * **Structural Integration:** The wall surface is ground down to bare aggregate. High-tensile woven carbon fiber fabric straps (typically 4 to 6 inches wide) are saturated with structural epoxy resin and bonded directly to the interior wall face from top to bottom. * **Top and Bottom Load Anchoring:** To prevent the entire wall from pivoting inward as a rigid unit, modern systems tie the carbon fiber strap into the building framework: 1. *Top Sill Plate Bracket:* A heavy-gauge galvanized steel bracket ties the carbon strap directly to the home's wooden sill plate and floor joist system. 2. *Bottom Footing Pin:* The strap is locked into the concrete footing using a carbon fiber or steel anchor pin, securing the wall against both base kick-out and top-edge rollover. ### 3. When Heavy Structural Interventions Are Required Carbon fiber is an outstanding stabilization material, but it cannot straighten a wall that has already failed past its yield point: * **Wall Bowing Exceeding 2 Inches:** When inward lateral deflection exceeds 2 inches, or when block courses have physically slipped off the bottom footing course by 1/2 inch or more, the wall requires structural steel I-beams (adjustable structural steel columns anchored to the footing and joists) or **helical earth tiebacks** (steel anchor shafts drilled through the foundation deep into stable exterior soil). * **Footing Subsidence (Underpinning):** If diagonal or stair-step cracks stem from downward footing settlement, structural underpinning is mandatory. **Hydraulic steel push piers** or **helical piers** are driven through unstable upper clay layers down to solid bedrock or competent load-bearing load zones, transferring the weight of the home off the failing soil. --- ## The Professional Foundation Crack Repair Sequence Executing an engineered, permanent foundation crack repair requires a disciplined sequence of mechanical preparation, chemical delivery, and site drainage correction:
1. Diagnostic Survey

Calibrated crack depth measurement, moisture testing, and structural deflection analysis.

2. Port Setting & Capping

Mechanical injection ports affixed at 8" intervals and sealed with high-strength surface epoxy.

3. Controlled Injection

Low-pressure resin injection starting from bottom port until resin flows steadily from upper ports.

4. Dressing & Exterior Drainage

Ports ground flush with concrete surface, followed by exterior grading and gutter discharge verification.

### Step 1: Structural Diagnostic Survey & Crack Monitoring Technicians inspect the foundation interior and exterior perimeter. The crack width is recorded along its entire length using an optical comparator or crack-width gauge. Technicians inspect for planar offset (indicating shear displacement) and test for plumb using a laser transit. If crack movement is suspected but unconfirmed, calibrated acrylic tell-tale crack monitors are affixed across the fracture to track movement over 30 to 90 days. ### Step 2: Surface Preparation & Port Positioning The concrete surface spanning 1 to 2 inches on either side of the crack is cleaned down to bare aggregate using a wire wheel or reciprocating mechanical scarifier. Wire brushing is preferred over heavy abrasive grinding to avoid packing concrete dust into the crack mouth. Injection ports (base-plate surface ports or mechanical drilling packers) are aligned directly over the crack at intervals typically equal to the thickness of the wall (e.g., 8 inches apart on an 8-inch thick poured wall; closer for hairline cracks). ### Step 3: High-Strength Cap Sealing A rapid-curing, high-modulus epoxy paste or polyester surface sealer is applied over the crack face between ports, forming a continuous bead approximately 1 inch wide and 3/16 inch thick. The surface seal prevents the liquid injection resin from leaking out the interior face under pumping pressure, forcing the resin to travel through the full depth of the wall to the exterior soil interface. The cap seal cures for approximately 60 to 90 minutes. ### Step 4: Controlled Low-Pressure Injection (Bottom-Up Method) Injection begins at the lowest port on the wall: * Injection pressure is maintained at a controlled 20 to 40 psi. Low-pressure injection ensures that the resin flows thoroughly into fine lateral micro-fissures and does not blow past internal obstructions. * The technician injects resin continuously until liquid emerges from the port immediately above. * Once resin appears at the adjacent port, the current port is capped, and the injection line is transferred to the next higher port. This sequential bottom-up process guarantees that air is purged and the entire 8- to 10-inch cross-section of the concrete wall is completely filled from bottom to top. ### Step 5: Port Removal & Surface Dressing After the resin has fully polymerized (15 to 30 minutes for polyurethane; 12 to 24 hours for structural epoxy), the surface injection ports are snapped off with a hammer or cut flush. If the basement is an unfinished utility area, the protective cap seal can remain in place. For finished basements, technicians grind the cap seal flush with the surrounding concrete and apply an elastomeric vapor barrier coating. ### Step 6: Exterior Drainage Remediation Crack injection addresses the symptom; long-term durability requires eliminating the hydraulic pressure that caused the failure: * **Downspout Extension:** Roof downspouts are routed through solid PVC pipes to discharge water a minimum of 10 feet away from the foundation perimeter. * **Positive Surface Grading:** Soil grade around the foundation is rebuilt to provide a minimum 6-inch drop over the first 10 feet away from the foundation wall (a slope of roughly 1/2 to 1 inch per foot). * **Subsurface Drainage & Sump Systems:** In properties with chronic high water tables or severe clay backfill saturation, an interior perimeter drain tile system and dual-pump sump basin with battery backup are installed to relieve sub-floor hydrostatic head permanently. --- ## When to Engage an Independent Structural Engineer Homeowners facing foundation cracks often wonder whether to call a foundation repair contractor or hire an independent licensed professional engineer (PE). Both play distinct, critical roles in the rehabilitation of residential structures: * **Foundation Repair Specialists:** Provide specialized diagnostic equipment, certified installation crews, warranty-backed proprietary systems (such as carbon fiber straps and injection equipment), and free initial evaluations. Contractors are the proper call for straightforward water leaks, stable hairline vertical shrinkage cracks, and standard crack injection. * **Independent Structural Engineers (PE):** Structural engineers have no commercial interest in selling repair materials or contracting services. A structural engineer conducts a formal inspection, takes comprehensive manometer elevation readings across all floors, calculates soil loads, and issues an unbiased, stamped engineering report with precise remediation specifications. You should retain an independent structural engineer prior to signing repair contracts under the following conditions: 1. A horizontal crack extends across a concrete or masonry wall with inward bowing exceeding 1 inch. 2. A crack exhibits noticeable planar displacement (one wall face pushed inward relative to the other). 3. Stair-step cracks in concrete blocks exceed 1/4 inch in separation or are accompanied by jammed exterior doors and cracked drywall upstairs. 4. You are buying or selling a home, and the home inspector has flagged foundation structural movement on the seller disclosure. 5. A contractor quotes major structural interventions ($15,000 to $40,000+) involving multiple helical piers or complete excavation. An independent engineer's assessment (typically $400 to $800) ensures you only pay for work that is structurally necessary. If you are dealing with broader structural movement, shifting footings, or bowing basement walls beyond single crack repair, review our comprehensive resource on [foundation repair in Cincinnati](https://cincinnati.groundlevelgrowth.io/) to understand full-perimeter stabilization strategies and diagnostic standards across Greater Cincinnati. ## Frequently asked questions ### When is a foundation crack considered dangerous? Horizontal cracks, stair-step cracks in concrete blocks, and vertical cracks wider than 1/4 inch or offset across planes indicate active structural movement. ### Can epoxy injection fix a structural foundation crack? Epoxy seals cracks against water and restores concrete tensile strength, but if the wall is actively moving, structural stabilization like carbon fiber or piers is required. ## Sources - [American Concrete Institute: Causes, Evaluation, and Repair of Cracks in Concrete](https://www.concrete.org) (accessed 2026-09-28) --- Cincinnati Foundation Repair Co is an independent referral service. We connect homeowners in Greater Cincinnati with a local foundation and waterproofing contractor; we do not perform repairs ourselves.