Family-owned and operated since 2000, Complete Basement Systems (CBS) is proud to be Long Island’s longest-standing basement and crawl space repair company. For more than 25 years, we’ve helped homeowners protect their most valuable investment by preventing water and humidity damage. Our consultative approach sets us apart—we don’t just fix problems, we educate homeowners and deliver tailored solutions designed for lasting peace of mind.
Founded in 1984, PTS Foundation Supply (PTSFS) has been the Northeast’s go-to resource for helical piles, driven anchors, and installation equipment. From design to installation, we know how complex foundation projects can be. That’s why professionals across the region count on our 100+ years of collective experience to provide reliable products, expert insight, and a partnership that helps every project start—and finish—on solid ground.
Since 1973, Premium Technical Services (PTS) has been the Tri-State area’s trusted partner in foundation repair, below-grade waterproofing, and grouting. With more than 50 years of service and over 100 years of combined expertise on our team, we bring proven solutions to keep your foundation strong, dry, and secure for the long run.
Family-owned and operated since 2000, Complete Basement Systems (CBS) is proud to be Long Island’s longest-standing basement and crawl space repair company. For more than 25 years, we’ve helped homeowners protect their most valuable investment by preventing water and humidity damage. Our consultative approach sets us apart—we don’t just fix problems, we educate homeowners and deliver tailored solutions designed for lasting peace of mind.
Founded in 1984, PTS Foundation Supply (PTSFS) has been the Northeast’s go-to resource for helical piles, driven anchors, and installation equipment. From design to installation, we know how complex foundation projects can be. That’s why professionals across the region count on our 100+ years of collective experience to provide reliable products, expert insight, and a partnership that helps every project start—and finish—on solid ground.
Epoxy Injection Crack Repair for Structural Restoration
"*" indicates required fields
Cracks in your concrete walls or foundation can signal real structural problems. Epoxy injection crack repair is one of the most trusted foundation crack repair services for restoring strength, sealing cracks from water intrusion, and preventing long-term damage. Using specialized epoxy crack injection foundation repair materials and techniques, this process bonds cracked concrete back together, creating a strong, permanent seal that reinforces the original structure.
At Complete Basement Systems, homeowners across Long Island can rely on our residential epoxy injection solutions for basements, foundations, and retaining walls. Our team expertly seals and stabilizes smaller residential cracks to keep moisture out and your home safe. Meanwhile, Premium Technical Services provides large-scale, engineered epoxy injection crack repair for commercial buildings and infrastructure across NYC and surrounding areas.
Whether you’re protecting your home or reinforcing a commercial structure, our foundation crack repair services are designed to handle a variety of materials, surfaces, and applications, ensuring long-term stability and protection against further water or structural damage.
What Is Epoxy Injection?
Epoxy injection crack repair is a specialized method used to restore the strength and integrity of cracked concrete. It works by injecting a two-part epoxy resin (a combination of resin and hardener) directly into the crack under pressure. Once cured, the material bonds the concrete back together, creating a strong, solid seal that’s ideal for structural crack repair and epoxy applications.
Unlike polyurethane systems, which are more flexible and often used for waterproofing, epoxy injection is designed for load-bearing restoration where structural strength is required. It’s commonly applied to concrete slab cracks, horizontal surfaces, walls, and foundations where stability is a concern.
According to Waterproof Magazine, epoxies formulated for structural and load-bearing applications are classified under ASTM C-881, which defines the Type, Grade, and Class of the product used.
- Type: Identifies the type of epoxy used for a specific repair purpose (bonding, crack injection, or anchoring)
- Grade: Refers to the viscosity or thickness of the epoxy resin:
- Grade 1: Low viscosity: Thin and ideal for low-viscosity epoxy crack injection into narrow or deep cracks.
- Grade 2: Medium viscosity: Used for moderate-width cracks.
- Grade 3: Non-sagging consistency: Suitable for vertical or overhead applications
- Class: Indicates the temperature range in which the epoxy can be installed:
- Class A: Below 40ºF
- Class B: 40-60ºF
- Class C: Above 60ºF
For most epoxy injection crack repair projects, professionals use a low-viscosity epoxy system specifically formulated for structural crack repair epoxy to ensure deep penetration and long-term bonding strength.
How Epoxy Injection Works
The epoxy injection crack repair process involves a series of precise, professional steps designed to restore concrete strength and long-term stability. Each phase ensures the epoxy fully penetrates and bonds the cracked area, expanding into voids and solidifying the structure from within. Here’s how our crack repair services are performed.
1. Surface Preparation & Cleaning
The repair begins with cleaning the concrete surface to remove dirt, debris, or loose materials that could affect adhesion. Technicians identify each point of opening along the crack and plan the port layout to ensure full epoxy coverage. Proper prep helps maintain the integrity of the repair and allows the epoxy to bond directly with sound concrete.
2. Port Installation & Sealing
Injection ports are securely placed along the length of the crack, typically spaced every few inches. The surface is then sealed with a quick-curing material, preventing the epoxy from leaking during injection.
3. Mixing & Injection
A two-part epoxy is mixed on-site and injected under controlled pressure, starting from the lowest port point and working upward or outward, depending on the crack’s position. This step ensures the epoxy fills the entire crack and expands into voids for complete coverage.
4. Curing & Strength Development
Once injected, the epoxy begins to harden, typically curing within several hours. As it sets, it bonds the fractured concrete together, effectively restoring the concrete’s strength and structural integrity.
5. Finishing & Cleanup
After curing, ports and surface seals are carefully removed, and the surface is refinished for a smooth appearance. The repaired section is now suitable for long-term use and can often outperform the surrounding concrete when compared to untreated areas.
When to Use Epoxy - Use Cases & Decision Criteria
Epoxy injection crack repair is best for structural cracks where restoring strength and stability is the goal. It’s ideal for foundation crack repair and concrete slab restoration when the crack is clean, dry, and can be fully filled.
- Structural vs. non-structural cracks: Use epoxy for cracks caused by movement, load stress, or settlement. Non-structural or leaking cracks may be better suited for urethane.
- Dry vs. wet substrates: Epoxy must be applied to a clean, dry surface; water prevents bonding.
- Crack width thresholds: Typically used for cracks larger than 0.002 inches. Too narrow or dirty cracks should be cleaned to remove debris before repair.
- Hybrid systems: In some cases, epoxy and urethane are combined. Epoxy for the development of structural strength and urethane to seal against leaks.
Advantages/Benefits of Epoxy Injection
Epoxy injection crack repair offers unmatched strength and performance for restoring damaged concrete structures. Unlike flexible sealants, epoxy permanently bonds the concrete together, creating a rigid, load-bearing repair.
Key benefits include:
- High strength and stiffness: Provides superior reinforcement for structural elements under stress.
- Rigid bonding and load transfer: Ensures the two sides of a crack act as one solid piece after repair.
- Durability: Long-lasting solution that resists further cracking or water intrusion.
- Precision application: Ideal for narrow or deep cracks in walls, beams, and slabs.
- Versatility: Suitable for both residential and commercial concrete crack repair projects.
With professional application, epoxy injection crack repair delivers lasting structural integrity and protection against future damage.
Limitations/Risks of Epoxy Injection
While epoxy injection crack repair is one of the strongest and most reliable methods for structural crack repair, it isn’t suitable for every situation. Because epoxy is rigid when cured, it can’t flex with future movement or shifting.
Key limitations include:
- Not for wet or leaking cracks: This method performs poorly when water is present; epoxy won’t bond or fill properly in damp conditions.
- Limited flexibility: Once injected and hardened, epoxy cannot stretch, making it unsuitable for cracks caused by ongoing structural movement.
- Higher cost and skill requirement: Professional equipment and training are required for proper injection and curing.
- Surface preparation sensitivity: The concrete slab or wall must be clean and dry before application to ensure strong adhesion.
- Temperature constraints: Certain epoxy formulations can only be applied within specific temperature ranges.
When applied correctly and under the right conditions, epoxy injection crack repair remains an excellent choice for permanent, high-strength structural restoration.
Technical Considerations & Best Practices
Successful epoxy injection crack repair depends on careful control of materials, pressure, and environmental conditions. When repairing cracks in concrete, following these technical best practices ensures a durable and long-lasting result:
- Injection pressure: Maintain steady pressure, typically between 50 and 100 psi. This is high enough to push epoxy through the full crack length without causing further damage.
- Resin viscosity selection: Match epoxy viscosity to the crack width. Low-viscosity resins work best for narrow or deep cracks; medium or high viscosity is used for wider gaps or vertical surfaces.
- Temperature and humidity: Follow manufacturer guidelines for temperature and substrate moisture.
- Surface and substrate preparation: Clean cracks thoroughly to remove dust, oil, or debris before sealing and injecting.
- Avoiding failures: Prevent poor adhesion or incomplete fills by maintaining consistent injection pressure and ensuring each port fully discharges resin before moving to the next.
Epoxy Injection Crack Repair FAQs
No. Epoxy injection crack repair is not recommended for wet or actively leaking cracks. Moisture prevents proper bonding, so the surface must be clean, dry, and free of debris before the resin is applied.
After injection crack repair, most epoxy systems cure and reach full structural strength within 24 to 72 hours, depending on temperature and product type.
If a crack reopens, it may indicate ongoing movement or new structural stress. It’s important to check the source of movement. Sometimes, combining epoxy with flexible urethane may be recommended to handle both strength and waterproofing.
Yes, epoxy can completely fill narrow and deep cracks when injected under the proper pressure. For wider cracks, additional surface sealing or multiple injections may be required to achieve a complete bond.
Clean the crack to remove debris, dirt, or oil before sealing and installing ports. Proper preparation ensures the epoxy adheres well and restores the full integrity of the structure.
Get in Touch With Premium Technical Services Today
When it comes to epoxy injection crack repair, precision and expertise make all the difference. The team at Premium Technical Services is here to help you restore the strength, safety, and longevity of your structure.
Our specialists also offer urethane crack injection for waterproofing, providing a complete solution that strengthens your concrete and keeps water out for good. To get started, fill out our online form or call us at (516) 409-6000 to schedule a consultation.
Want to see our work in action? Explore our case studies to learn how Premium Technical Services has successfully repaired and reinforced concrete structures across New York City and beyond.