Epoxy Injection for Commercial Concrete Crack Repair
Stone Restoration of America has provided epoxy injection solutions that commercial property managers and general contractors trust since 1993. Serving properties throughout North and South Carolina, we restore structural integrity to cracked concrete on occupied buildings, parking structures, and building exteriors — stopping water intrusion before it compounds into a larger structural problem. Proudly serving properties throughout North and South Carolina, we are here to ensure the structural integrity of your building exteriors and parking structures, stopping water intrusion in its tracks for long-term protection you can rely on for years to come.
Get a quote for epoxy injection at your commercial property today!
What a Crack in Your Concrete is Really Telling You
Cracks in structural concrete aren’t just an eye sore; they point to more significant issues with your load path, especially when they appear in beams, columns, slabs, and retaining walls. When concrete cracks appear in these key areas, it’s a sign that your system is no longer behaving as designed.
Water follows the path of least resistance, and when cracks appear, they give water an easier route through which to infiltrate the structure. When water intrusion occurs, it can lead to rebar corrosion, spalling, and complete deterioration over time. In occupied buildings, that deterioration cycle carries significant liability exposure. Property owners and facility managers need contractors who can expertly execute repairs to ensure safety and regain structural integrity quickly. Crack patterns also carry diagnostic information. Step cracks following mortar joints, diagonal cracks near openings, and horizontal cracks at structural members each point toward different underlying conditions. Identifying the cause before specifying the repair method is what separates a permanent fix from one that fails when the crack reopens.
That’s where epoxy injection comes in. As the industry-standard method for restoring structural integrity to cracked concrete without demolition or replacement, quality epoxy injection is the gold standard for correcting cracks and preventing water intrusion. Done correctly, it fills the crack completely, bonds the faces together, and restores the section to near-original load capacity.
Restored Strength. Sealed Against Water. No Demolition.
Epoxy injection addresses structural failures and stops water intrusion in its tracks in a single operation. The repair restores load capacity, seals the crack against infiltration, and protects the rebar from further corrosion. Not only is epoxy injection structurally effective, but it’s also less expensive than the cost of removal and replacement. With epoxy injection, there’s no need to relocate tenants, shut down operations, or close down parking structures for weeks on end.
Not only is epoxy injection great for active structural impairments, but it also offers durable repairs for dormant cracks. This repair also integrates seamlessly with existing waterproofing strategies. For engineers of record and GC project teams, epoxy injection under ACI 503 and ICRI guidelines produces a documentable, defensible specification, with all work performed to standard, documented, and available for the project record. For active cracks or cracks with moisture present, polyurethane injection is the appropriate method before epoxy injection is considered. SRA performs both, and crack classification at the outset determines which method — or which sequence of methods — applies to the specific condition.
The Epoxy Injection Process
At Stone Restoration of America, we follow a structured five-step process for every epoxy injection project we take one:
Crack evaluation and classification
Before any material is ordered or equipment staged, we’ll carefully document the crack width, depth, length, and whether it is dormant or active to determine the repair specification.
Surface preparation
From there, we’ll clean and dry all crack faces, mark port locations at calculated intervals based on our evaluation findings, and ensure all surfaces are prepared according to ICRI guidelines.
Port installation
Next, we bond surface-mounted ports at each marked interval, sealing the crack face between ports with epoxy paste to create a closed system and ensure the crack is completely filled.
Injection
Using two-component epoxy under low pressure at each port, we perform injection, confirming penetration at the adjacent port before advancing to ensure thorough repairs.
Port Removal
Once the epoxy has cured, all ports are removed and the surface is finished flush. We carefully document injection depth and penetration to provide to the engineer of record. This documentation package supports the project record, satisfies engineer of record requirements, and provides the property owner with a defensible repair history if the structure is ever subject to inspection, sale, or financing review.
Get a quote for epoxy injection at your commercial property today!
Commercial Applications for Epoxy Crack Injection
Epoxy injection is commonly used for a wide range of concrete structures in commercial and institutional settings, including:
Parking Structures
Slabs, columns, beams, and ramp structures all develop cracks under traffic loading and thermal cycling. Water infiltration in a parking deck accelerates rebar corrosion faster than almost any other exposure condition.
Building Exteriors
Concrete panel cracks and spandrel beam failures are common in curtain wall systems, and water entry through those cracks can cause interior damage across multiple floors.
Retaining Walls
Retaining walls develop cracks under hydrostatic pressure and soil movement. Water infiltration through retaining wall cracks accelerates deterioration of the wall section and, in cases where the wall is adjacent to occupied or trafficked areas, creates potential structural liability.
Industrial Floors, Columns, and Structural Members
Industrial and warehouse floors crack under point loading and forklift traffic. Columns and beams in any structural system may require injection following impact damage, load overloads, or settlement. Epoxy injection restores load capacity to these elements without the downtime and cost of demolition and replacement.
Post-Tensioned Concrete
The repair specification on post-tensioned slabs or beams must account for tendon locations and the structural behavior of the system. Our team understands the additional considerations involved with these structures.
Multi-Family & Mixed-Use Properties
Balconies and podium decks on multi-family and mixed-use properties are another common project type for epoxy injections. Balcony slabs that have cracked and begun leaking into units below need injection repair and, in most cases, a complementary waterproofing layer above.
Frequently Asked Questions About Epoxy Injection
What is the difference between epoxy injection and polyurethane injection?
Epoxy injection is used for structural crack repair. The material bonds the two faces of the crack together and restores load-bearing capacity to the section. Polyurethane injection is used for active cracks or cracks where water is present, because polyurethan expands on contact with moisture and can seal a wet crack. The two methods address different conditions. Using epoxy in a wet crack will result in a failed repair.
Can epoxy injection repair structural cracks in concrete?
Yes. Properly executed epoxy injection restores a dormant structural crack to near-original load capacity. The repair is recognized under ACI 503 and ICRI guidelines specifically for structural applications. Cracks must be dormant for epoxy injection to work properly. Active or moving cracks are not candidates for this method.
How long does epoxy injection last?
On a dormant crack that has stopped moving, an epoxy injection repair is permanent under normal conditions. The bonded section behaves as a continuous element. If the underlying cause of the crack has not been addressed and the crack continues to move, the repair will eventually fail. That’s why crack classification before injection is imperative.
Can you inject a crack that is actively leaking?
Not with epoxy. Active water infiltration prevents epoxy from bonding properly. Cracks with active leaks require polyurethane injection or another moisture-tolerant method first. Once the leak is stopped and the crack is stable, epoxy injection may be appropriate depending on the structural requirement.
How wide does a crack need to be for epoxy injection?
Epoxy injection can be performed on cracks as narrow as 0.002 inches (0.05 mm) under controlled conditions. The practical lower limit on most commercial projects is around 0.005 inches. There is no strict upper limit, but very wide cracks may require a different repair approach or a combination of methods. Width, depth, and structural context all factor into the repair specification.
What types of concrete structures can be repaired?
Epoxy injection is used on parking decks, building facades, retaining walls, industrial floors, columns, beams, post-tensioned slabs, balconies, and podium decks. Any structural concrete element with a dormant crack that requires restored load capacity is a candidate.
Is epoxy injection safe to perform in an occupied building?
Yes, with proper planning. Low-pressure injection generates minimal dust and disruption. Two-component epoxy materials used for injection are not highly volatile, and the work area requirements are manageable in occupied settings.
Do you perform polyurethane injection as well as epoxy injection?
Yes. Polyurethane injection is the appropriate method for active cracks or cracks with moisture present, where epoxy cannot bond properly. SRA performs both methods. Crack classification at the outset of every project determines which method applies — or whether a sequence of polyurethane followed by epoxy is required to address both the active leak and the structural condition.
What documentation is provided after epoxy injection work is complete?
SRA provides documentation of crack classification, port locations, injection depth, and penetration confirmation for every project. This package is formatted for submittal to the engineer of record and becomes part of the permanent project record. For property owners managing occupied commercial buildings, that documentation also supports future inspection, financing, and sale processes.
Request an epoxy injection quote from our team
We work on occupied buildings, active parking structures, and operating industrial facilities. Project planning accounts for tenant access, operational schedules, and safety requirements specific to each site. For general contractors and engineers who need a specialty subcontractor with the certifications, documentation practices, and field experience to handle structural crack repair correctly, SRA is the contractor of record throughout the Carolinas.