Concrete Foundation Leak Repair Made Easy Structural Epoxy for Concrete Walls
Poured Concrete Basement Foundation Wall Cracks Professional results
Base Kit Components 10 ft Epoxy Concrete Crack Repair kit Premium Epoxy 121 LV . Enough material to inject a 1/8" wide 8-10 ft long crackcartridge of Crack Seal and Port Adhesive type 903 Paste. Shipping! USA & Canada
Optional Items
Alternative injection tools are recommended for large jobs or injecting the 101 Epoxy Paste or the Extra High Viscosity Epoxy. The Heavy Duty Two-Part Epoxy Gun has a 26:1 trust ratio vs. the standard 18:1 ratio, which makes dispensing thicker products more manageable. This Epoxy tool has a multi-ratio push-disc for a quick change to other ratio pistons for product mix ratios such as 1:1, 2:1, and 3:1 ratios. Or, the Spring-Loaded Two-Part Contractor Epoxy Gun is an upgraded HD version with spring tensioning, which relieves the user from applying constant pressure during epoxy injection. Only occasional activation is required to maintain the pressure on an average of 50 psi. This injection tool is the best choice option during extensive or large projects. The spring reduces user fatigue during the concrete injection repair process.
Other options include adding extra tubes of Epoxy or requesting the exchange of standard surface ports to corner ports to match your concrete foundation crack repair project.
See installation video guide
Epoxy Technical Specifications
Technical Specifications 1:1 Epoxy
Technical Specifications 2:1 Epoxy
E101 Injection Paste Meets ASTM Specifications:
Tensile Strength, 8500 psi ASTM D-638
Ultra-Low Viscosity# 4 Meets ASTM Specifications:
MIX RATIO 2: 1 VOLUME(A: B )
Easy-to-use as DIY Kit or Upgrade to a Professional Tool, same products DIY Epoxy Crack Injection Kits offer a professional-grade repair solution to any structural cracking in concrete walls. A DIY'er can upgrade to a professional contractor version of the injection tool to make a job more convenient. The kit is very user-friendly so that someone with minimal construction experience can use it. No construction expertise or specialized knowledge is required because no exterior digging or excavation is needed. The low-pressure epoxy injection process from the inside of the wall to the outside fills the cracks, pores, concrete flaws, voids and, joints in an easy industry standard process. These NextStar Epoxy kits offer the best solution to repair projects that may be structural or predict future problems and are designed explicitly for foundation walls or footings. NextStar’s standard 121 Epoxy injection material will cure down to 32°F and gel in 20 minutes, 10-20 degrees cooler than competitors' products, allowing more winter weather repairs or open foundations. All of our injection kits include a flash drive that provides many different repair examples of voids, honeycomb, snap ties, and other scenarios that are pretty frequent with concrete wall repair.
Why are Cheaper Kits Not A Good value? Other concrete crack repair kits on the market use a standard caulking tube and will be short material to adequately fill up the crack or flaw, leaving the repair unfinished. The user is required to buy more products than expected to complete the repair. Most of these tubes are 7-9 oz, 185 – 250 ml, compared to a single professional-grade dual-tube from NextStar, which is a full 600 ml. Some other products on the market use a single caulking tube size with an internal piston to dispense equal amounts of the chemical. During this process, it distributes much less material than the applicator anticipated. The retail or universal cartridge will cost you more because you must purchase more products to complete the repair. A professional-grade dual cartridge system from NextStar provides more injection products in each cartridge.
All epoxy cartridges by any manufacturer have a limited shelf life of one year. The injection product age may be unknown or past the expiry date if purchased at a retail location. NextStar only supplies recently packaged material to extend the use time for our customers. Using caulking materials or hydraulic cement is a temporary surface patch only and nothing more. Using Nextstar professional-grade injection products for foundation crack repairs will save as the job only needs to be done once. The practical solution against structural wall cracks is a material that reestablishes its original strength and does not lose its integrity over time.
Why Epoxy Crack Injection Works? Epoxy and polyurethane serve distinct roles in crack repair, each excelling in specific scenarios. For permanent structural repairs , Nextstar’s epoxy is unmatched—its 12,000 PSI compressive strength (ASTM C-881 certified) and low-viscosity formula chemically bond to concrete, creating a rigid, long-term solution for foundations, walls, and load-bearing cracks (down to 1/32"). Polyurethane , meanwhile, shines in flexible, waterproof sealing : its elastic properties make it ideal for non-structural leaks in pipes, joints, or areas prone to minor movement. While epoxy offers 50+ years of stability and freeze-thaw resistance, polyurethane cures faster and accommodates dynamic shifts in materials like masonry veneers. At Nextstar, we provide both solutions—because the right choice depends on your project’s needs: epoxy for structural integrity, polyurethane for adaptable waterproofing.
Why Choose Epoxy Over Polyurethane for Crack Repair? When you have a poured concrete foundation that is in need of structural reinforcement, it is recommended to use an injection material that provides strength and support to the wall. Polyurethane foam is not suitable for this use. A NextStar Epoxy Kit is customized to offer maximum strength for concrete wall cracks and flaws. Polyurethane Foam resin does not provide any structural strength. Practically the limit for these types of crack injections is ¼ in or (1 cm). In such a case, Nexstar’s Epoxy Foundation Crack Repair Kits are the ideal choice. For structural bonding, Epoxy Resin is used in a similar method and injected with low pressure but cements the concrete back together as one solid wall. If the wall has seasonal movement, you should reinforce the foundation wall cracks with Carbon Fiber wall reinforcement after the injection repair.
Structural cracks in basement walls are usually horizontal. Large horizontal or diagonal cracks are a sign of structural problems, and you may need to contact a local structural engineer for recommendations.
Dealing with Ultra-Small Cracks and Snap-Tie holes Ultra fine concrete cracks that are less than 1/64 inch wide or form ties (snap ties) that have rusted it is recommended to use the #4 Ultra Low Viscosity Epoxy. Use a spring-loaded epoxy tool as it may take an extended time to penetrate the concrete wall. The ULV Epoxy is very slow to set and cure so it will allow for the extra injection time.
When is Epoxy not suitable, and you should use Polyurethane Foams? We recommend using the Polyurethane Injection kits when sealing and waterproofing non-structural small cracks in poured concrete walls. Low-pressure foundation crack injection is the simplest recommended solution for walls that are leaking, wet, or damp cracks. NextStar Poly kits are excellent for concrete fractures from 1/32 inch wide (1 mm) to ¼ inch wide (6.5 mm). Examples:
Active leaking cracks. NextStar offers Polyurethane kits using either low-pressure or high-pressure injection methods. Nextstar’s High-Pressure Polyurethane crack injection repair kits are a better choice if a wall crack is small and actively leaking water, previously repaired, or continuously damp but not visible. The repair can be completed successfully even if the wall is wet, providing the crack is non-structural.
Example of when Polyurethane Concrete Foundation Injection is the best solution Once non-structural cracks develop in a poured concrete foundation wall, the crack often remains stable or unchanged over time and can be injected with polyurethane to stop water from penetrating through from the outside. Basement Foundation wall cracks are commonly vertical or diagonal, and many begin in the edge of the poured window opening. An effective repair product to use for this type of foundation flaw is Polyurethane Foam Resin. Polyurethane foam remains flexible and allows for concrete's natural thermal movement. Contact with water causes a hydrophobic reaction in the Polyurethane to vigorously expand 10 to 20 times its original volume filling the entire flaw, void, length, crack depth, and sometimes the wall's exterior. When adequately injected, water will not penetrate through the crack again!
Tips & Notes for Repair of cracked foundation walls and cracks Take your time to complete the crack repair process; it can take up to 5 minutes for the Epoxy Resin to travel to the next port.Very Small Hairline Cracks require that you warm the tubes of Low or Ultra Low Viscosity Epoxy Cartridges in advance by placing them in hot water.Above Ground Exterior Cracks on the foundation's exterior needs to be sealed over with epoxy paste or hydraulic concrete to keep the product inside the wall during the injection and curing process.Corner Wall Cracks - t he standard injection ports can be cut or bent to fit in a corner crack if you have no corner ports or add the option to your order.Spring Loaded Contractor Epoxy Injection Tool . We recommended if you plan to do 30 or more feet of repairs or plan to use thicker viscosity, it can be a large labor saver on your hands, maintaining pressure.Dry Concrete walls : The wall you are applying the sealing epoxy paste should be dry and clean. A wet internal wall does not prevent the Epoxy's bonding, but the results will be better if the surface is as dry as possible.volume calculator .
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