When should I use polyurethane vs epoxy for crack injection?

Use polyurethane for non-structural, leaking cracks—especially when moisture is present—because hydrophobic PU reacts with water and expands to seal through the wall. Use epoxy for structural cracks when you need to bond the concrete and restore strength.

Can polyurethane be injected into an actively leaking foundation crack?

Yes. Hydrophobic polyurethane is designed for wet conditions; it reacts with water and expands into voids and pathways to stop active leaks and waterproof basements.

What coverage do the kits provide?

Most polyurethane and epoxy kits are sized by crack length. Common options cover approximately 10–60 ft. Choose the kit that matches your measured crack length; supplies and refills are available for longer repairs.

Are low-pressure injection kits suitable for hairline cracks?

Yes. Low-pressure injection with the correct resin viscosity can treat hairline and fine cracks. For previously repaired or very fine, hidden pathways, consider high-pressure options to drive resin deeper.

Do I need extra supplies like ports, pastes, or mixers?

Kits include core materials, but additional ports, surface paste, mixers, and resin can be purchased as needed. See Injection Supplies & Refills for individual components.

Do I need excavation outside the wall?

No. Both polyurethane and epoxy injection systems repair from the inside of poured concrete walls, avoiding exterior excavation in most cases.

Category List

• Concrete Foundation Crack Repair kits

Polyurethane Crack Injection kits
Epoxy Crack Injection kits

• Supplies & Refills

Surface Paste, Mixers ,Ports
Epoxy Injection Products
Polyurethane Foam Products

• Concrete Floor Repair

Roadware Products
Concrete Slab repair kits
Flexible Joint filler

• Carbon Fiber Reinforcement

• Tools

• High Pressure Crack Injection

• Testing & Measurement

• Sump Pumps

• Concrete Sealers / Radon

• Crawl Space Sealing

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Concrete Foundation Crack Repair kits

Repair poured concrete foundation wall cracks from the inside - no digging. Choose polyurethane to stop water leaks, or epoxy to restore strength.

Polyurethane Crack Injection Kits (Waterproofing)

Quick guide: When to use Polyurethane

Best for non-structural, leaking cracks (even if wet).
Hydrophobic PU reacts with water and expands through the wall to seal.
Ideal around pipe penetrations and typical basement wall leaks.

Shop Polyurethane Injection Kits ->

Epoxy Crack Injection Kits (Structural)

Quick guide: When to use Epoxy

For cracks that need strength - bonds concrete back together.
Low pressure delivery with viscosity options for hairline to wider cracks.
Add stitches/staples where reinforcement is required.

Shop Epoxy Injection Kits ->

Supplies, Refills & Accessories

Ports, pastes, mixers, and reinforcement

Injection Supplies & Refills - everything for polyurethane and epoxy systems.

Reinforce across repaired cracks with Carbon Fiber/Kevlar staples where added strength is needed.

Need help choosing? Compare kits below or call for quick sizing help.

Sub Categories

Polyurethane Crack Injection kits

Polyurethane crack injection kits stop leaking concrete basement foundation cracks fast. Best method Basement Waterproofing DIY kits & for contractors. Non-structural leaking concrete cracks in basements and foundations.

Epoxy Crack Injection kits

Concrete Epoxy Crack Injection Kits for Poured Foundation Walls - D-I-Y and Pro Products for Repairing Cracks in Basements and Vertical Walls.

Category Items

10ft DIY Universal Polyurethane Foam Crack Injection kit1

DIY Basement Leak Repair Kit. Permanently stop water with our professional 10ft polyurethane foam injection system. Fast, easy, and effective.

NX1110

~~$150.00 USD~~ $122.00 USD

InStock

Polyurethane Crack Injection Kit 10-60ft

10ft Pro Polyurethane Concrete Crack Injection Kit optional Upgrades to 60ft for Leaking foundation basement walls, Professionally repair concrete wall cracks from 1/32 to 3/8 in wide.

NX1112

~~$219.00 USD~~ $169.00 USD

InStock

Pipe Penetration Kit (1-4 Pipes)

Pipe penetration seal kit for 1 to 4 pipes or holes in concrete. Easy-to-use kit with blended polyurethane foam. Repair around pipes entering basement that may leak.

NX1114

$99.00 USD

InStock

High pressure polyurethane concrete crack injection kit

High Pressure DIY Foundation Crack Injection Repair kit

High-Pressure DIY kit for repairing small leaking concrete cracks. Includes 25 injection packers, polyurethane, high-pressure tool, and installation tools.

NX1116

$199.00 USD

InStock

10 ft DIY ULV Auto Injector Kit 3 for Ultra Small Cracks

Professional-grade ULV Epoxy Crack Injection Kit for cracks smaller than 1/64. Complete DIY solution with auto-injectors for permanent repairs - no digging or special tools needed. Includes all materials and support.

NX1310

$189.00 USD

InStock

Close-up of Nextstar 10ft epoxy crack repair kit components

Epoxy Foundation Crack Repair Kit 10-60ft

10ft Pro Epoxy Concrete Crack Injection Kit optional Upgrades to 60ft for structural concrete foundation wall crack repairs using low-pressure injection of epoxy. Includes Low Viscosity 32 degree curing epoxy. Can be upgraded to a 60ft contractor kit.

NX1312

$218.00 USD

InStock

Carbon Fiber Stitch Staple and Epoxy 8-15 ft Ultimate Repair Kit

Repair structural concrete cracks permanently with NextStar’s carbon fiber stitch & epoxy kit—professional strength for walls up to 15 ft.

NX1314

$301.00 USD

InStock