Epoxy Foundation Crack Repair Kit 10-60ft

Epoxy Foundation Crack Repair Kit — ASTM-C881, 12,000 PSI | 10 to 60ft

ASTM-Certified Structural Epoxy for Poured Concrete Foundation Walls

Poured Concrete Basement Foundation Wall Cracks
Permanent Structural Repair — Bonds Concrete Back Together
Broken footing walls & supports
Swimming pools
Wall spalls or concrete voids in ICF walls
No outside digging required — repair from the inside
ASTM C881 Certified — 12,000 PSI Compressive Strength
Repairs cracks from 1/32 to 3/8 inch wide
Cures at 32°F — 10 to 20 degrees cooler than most competitors
Free NextStar Technical Support — 1-866-445-3984
Ships USA & Canada
Assembled in Canada with U.S. and global materials

ASTM-C881 Compliance — What the Standard Means for Your Repair

ASTM C881 is the American Society for Testing and Materials standard for epoxy resin adhesives used in structural concrete repair. Compliance means the epoxy has been independently tested and certified to meet minimum performance thresholds for bond strength, tensile strength, and compressive strength. NextStar LV-121 epoxy meets ASTM C881 at 12,000 PSI compressive strength — stronger than the surrounding concrete, which typically tests at 3,000–5,000 PSI. The repaired crack is permanently bonded and will not reopen under normal structural loading.

Kit Sizes — 10ft, 20ft, 30ft, and 60ft

• Premium Epoxy 121 LV: 2 Dual Cartridges (600ml / 20.2oz each) — fills a 1/8 inch wide, 8–10 ft crack. 121 LV info
• Crack Seal & Port Adhesive (903 Paste): 1 Cartridge — secures ports and seals crack surface. 903 Paste info
• Dual Cartridge Injection Gun: Professional-grade tool for precise, controlled epoxy delivery
• Surface Injection Ports & Caps: 15 ports — enough for an 8–12 ft crack; optionally exchangeable for corner ports
• Static Mixing Nozzles: 3 — 1/4 x 32 element nozzles & nut
• Injection Hose Assembly: With shut-off valve for controlled port-to-port delivery
• Blowout Repair Syringe: Fast-setting epoxy syringe for sealing blowouts during injection
• Mixing Tools: Trowel and mixing sticks for paste preparation
• Safety Gear: Safety goggles and 4 pairs of nitrile gloves
• Wire Brush: For crack cleaning and surface prep
• Complete Instructions: Step-by-step guide, instructional flash drive video, and MSDS Safety Data
• Ships to USA and Canada

Kit Size Comparison — What’s Included in Each Version

All kits include the base tools: dual cartridge injection gun, wire brush, safety goggles, nitrile gloves, trowel, mixing sticks, blowout syringe, and complete printed instructions with flash drive video. Quantities shown are totals for each kit size.

Video: Step-by-step demonstration of low-pressure epoxy crack injection on a poured concrete foundation wall. Shows port placement every 8–10 inches, crack sealing with 903 paste, cartridge loading, purging, and bottom-to-top injection sequence. Covers real-world scenarios including snap ties, voids, honeycomb, and corner cracks. Applies to all kit sizes — 10ft through 60ft.

DIY Kit or Professional Tool Upgrade — Same Products, Same Results

NextStar Epoxy Crack Injection Kits give homeowners access to the same professional-grade structural repair materials used by contractors. You can upgrade to the contractor injection tool for added convenience on larger jobs — no construction expertise or specialized knowledge required. No exterior digging or excavation is needed. Low-pressure epoxy injection fills cracks, voids, and joints from the inside using an industry-standard method.

NextStar's LV-121 Epoxy cures down to 32°F and gels in 20 minutes — 10 to 20 degrees cooler than most competitors' products, allowing more repairs in cold weather and open foundation conditions. All kits include a flash drive with real-world repair examples covering voids, honeycomb, snap ties, and other common concrete wall scenarios.

Why Cheaper Kits Are Not a Good Value

Most competing crack repair kits use standard 7–9 oz (185–250 ml) caulking tubes. A single NextStar professional-grade dual cartridge contains 600 ml — more than twice the material. Cheaper kits consistently run short before the crack is fully filled, forcing you to buy more to finish the job. Some also use an internal piston that delivers less material than the label suggests.

All epoxy cartridges from any manufacturer have a one-year shelf life. Products purchased at retail may be near or past expiry. NextStar supplies only recently packaged material. Surface patches like caulking or hydraulic cement are a temporary fix — proper epoxy injection restores the wall to its original strength and only needs to be done once.

Epoxy vs Polyurethane — This Kit Is for Structural Repairs

Epoxy and polyurethane serve distinct roles in crack repair. For permanent structural repairs, NextStar's epoxy is the correct choice — its 12,000 PSI compressive strength (ASTM C-881 certified) and low-viscosity formula chemically bonds to concrete for 50+ years of stability. Polyurethane excels at flexible waterproofing of non-structural leaking cracks. At NextStar, we provide both solutions — epoxy for structural integrity, polyurethane for waterproofing active leaks.

Why Choose Epoxy Over Polyurethane for Structural Crack Repair?

When a poured concrete foundation requires structural reinforcement, polyurethane foam is not the correct product — it provides waterproofing but no structural bonding strength. NextStar Epoxy Kits cement the concrete back together as one solid wall. If the wall has seasonal movement after repair, reinforce with our Carbon Fiber Wall Reinforcement — the combination of epoxy injection and carbon fiber straps is the same method used by professional waterproofing contractors.

Dealing with Ultra-Small Cracks and Snap-Tie Holes

For cracks under 1/64 inch wide or rusted snap-tie holes, use the #4 Ultra-Low Viscosity Epoxy with a spring-loaded injection tool — the ULV is very slow to set, allowing extra time for full wall penetration.

When Should You Use Polyurethane Instead of Epoxy?

Use polyurethane injection kits for non-structural cracks that are leaking or actively weeping. Polyurethane remains flexible, accommodates thermal movement, and expands 20 times on contact with water. For continuously leaking or previously repaired cracks, NextStar's High-Pressure Polyurethane Kit works in both wet and dry conditions.

The Seven Steps to Complete Low-Pressure Epoxy Crack Injection

1. Clean the crack. Using the provided wire brush, vigorously clean the crack's full length to remove debris and loose paint, ensuring the surface is clean for port attachment.
2. Mix the port setting paste. Dispense a small amount of Type 903 paste onto cardboard or a paper plate and mix by hand until it turns grey.
3. Attach surface injection ports. Using the mixed paste, attach surface ports to the wall every 8–10 inches along the crack.
4. Seal the crack surface. Apply more paste between ports and over the exposed crack to contain the epoxy during injection. Let cure until hard — approximately 1–2 hours. Surface must be dry for best adhesion.
5. Warm cartridges if needed. For hairline cracks or cold conditions, warm the epoxy cartridges in hot water for 5–10 minutes before use to improve flow and penetration.
6. Load the injection tool. Install a static mixing nozzle on the cartridge and load it into the dual dispensing tool. Attach the feed hose. Purge a small amount onto cardboard to confirm both components are flowing evenly before starting.
7. Inject from the bottom up. Start at the lowest port. Inject slowly — epoxy can take up to 5 minutes to reach the next port. When epoxy arrives at the port above, cap the lower port and move up. Repeat to the top. Use the blowout syringe to seal any leaks as they occur. The repair is now structurally bonded.

Tips & Notes for Epoxy Foundation Crack Repair

1. Take your time — epoxy can take up to 5 minutes to travel to the next port. Do not rush the injection process.
2. Very small hairline cracks require warming the LV or ULV epoxy cartridges in hot water before injection to improve flow.
3. Above-grade exterior cracks must be sealed with epoxy paste or hydraulic cement on the exterior to keep the product inside the wall during curing.
4. Corner cracks: Standard injection ports can be cut or bent to fit, or add corner ports to your order.
5. Spring-Loaded Contractor Tool is recommended for 30 ft or more of repairs or when using thicker viscosity epoxies.
6. Dry concrete walls: The sealing paste surface should be dry and clean. A wet interior wall does not prevent epoxy bonding but dry surfaces give better results.
7. Not sure how much epoxy you need? Use our online volume calculator before ordering.

Frequently Asked Questions — Epoxy Crack Injection

Questions during your repair? Call our free technical support line at 1-866-445-3984 — our team is available to help throughout your project.