Crack Repair
Concrete and masonry crack repair involves filling, sealing, or reinforcing fissures in slabs, foundation walls, brickwork, and mortar joints, which is intended to address moisture seepage and help stabilize affected substrates.
6 possible tasks · typical 4-step process
What it is
Crack repair services focus on treating fissures across concrete slabs, poured foundation walls, brick veneer, and stone masonry. These procedures can involve cleaning, mechanical preparation, the injection of resins or chemical grouts, and the repointing or patching of surface joints. Typical service scopes address localized material separation, while broad structural replacement, comprehensive underpinning, or resolving deep subgrade soil subsidence are generally handled under separate structural or excavation contracts.
What Crack Repair can include
Epoxy Pressure Injection
This method generally involves placing surface ports along non-moving cracks in poured concrete walls or slabs, sealing the exterior opening, and introducing epoxy formulations designed to fill the void and bond separated surfaces.
Polyurethane Chemical Grout Injection
This technique typically involves injecting expanding hydrophobic or hydrophilic polyurethane resins into foundation cracks, where the material reacts with moisture to form a flexible barrier intended to limit water entry.
Mortar Joint Repointing
This process can include removing deteriorated, cracked, or loosened mortar from between brick or stone units using specialized tools, followed by placing and tooling fresh mortar formulated to match the existing masonry.
Crack Routing and Joint Sealing
For exterior flatwork such as driveways, sidewalks, or patios, contractors often widen surface fissures into defined channels, clean out debris, and apply elastomeric or polyurea sealants to accommodate minor slab movement.
Carbon Fiber Stitching
This reinforcement technique may include cutting channels perpendicular to fractures and setting high-tensile carbon fiber staples, straps, or grid components into structural adhesives to assist with load distribution across cracked walls.
Polymer-Modified Patching
Technicians clean and prepare wide static cracks or surface spalls before applying polymer-fortified cementitious repair mortars, which are designed to enhance adhesion and blend with adjacent surface textures.
How the work is typically performed
- 1
Substrate Inspection and Preparation
Contractors assess visible characteristics such as crack orientation, width, and surface condition. Preparation typically involves mechanical chasing, brushing, or vacuuming to remove loose aggregate, dust, and previous sealants from the opening.
- 2
Port Placement and Surface Sealing
When injection procedures are utilized, technicians place ports at intervals along the fracture and apply a surface paste or capping adhesive along the crack exterior to contain pressurized materials during application.
- 3
Material Delivery and Injection
Depending on the crack type, repair materials such as structural epoxies or expanding chemical grouts are introduced through the ports, often moving sequentially from lower to higher elevations until the void is filled.
- 4
Curing and Surface Profiling
Once injected or applied materials cure according to product specifications, temporary ports and surface caps are typically removed, and the surrounding area may be dressed, ground flush, or coated to align with adjacent surfaces.
Common reasons customers look for this service
- Observation of moisture or water seepage along basement walls or floor joints
- Appearance of horizontal, vertical, or stair-step fractures across concrete or masonry walls
- Presence of surface fissures or gaps extending through exterior concrete flatwork
- Loose, weathered, or deteriorated mortar between bricks, stone, or concrete blocks
- Noticed separation or minor shifting along existing cracks in foundations or slabs
About Crack Repair
What is the difference between epoxy and polyurethane crack injection?
Epoxy and polyurethane serve different functions within crack repair. Epoxy typically cures into a rigid compound often selected for non-moving cracks where restoring structural continuity across concrete elements is desired. Polyurethane grouts generally cure into a flexible foam that expands in the presence of moisture, which is commonly utilized to seal active water leaks and accommodate slight movement in foundation walls.
Does repairing a concrete crack prevent new cracks from forming?
A repair addresses only the specific fissure being treated. Because underlying factors such as soil conditions, ground movement, moisture cycles, and settlement can continue to exert pressure on the structure, stress may redistribute and result in new fractures elsewhere in the concrete or masonry over time.
How long does concrete crack repair material typically take to cure?
Curing times vary depending on the chosen material, application thickness, ambient temperature, and humidity. Expanding polyurethane grouts can set in a relatively short timeframe, often within a few hours, whereas structural epoxies and polymer-modified mortars typically require twenty-four to seventy-two hours to reach their intended cured state.
This page provides general information about Crack Repair for reference only. It is not professional, safety, medical, legal or financial advice, and it does not describe the services of any particular provider. Scope, methods and timing vary by provider and situation. Kuldesac does not perform these services; contact a qualified provider directly to discuss your specific needs.