Do-It-Yourself Foundation Concrete Crack Repair Kits

Foundation Crack Repair Made Easy for Homeowners

foundation crack repairIf you have cracks in your concrete foundation wall, you're not alone. Most houses, both new and old, develop some foundation cracks eventually. If the cracks aren't leaking now, it is only a matter of time that they will as the exterior waterproofing gradually deteriorates over time. If your basement cracks are leaking, now would be the time to repair them to avoid further water damage and possible mold growth in the basement.

Many homeowners have learned the hard way when it comes to crack repair, caulk, hydraulic cement, and patching materials do not last forever. Caulk will eventually lose adhesion and lost it's bond. Hydraulic cement does not adhere well to concrete and because it is a rigid material, the natural movement of concrete will cause it to separate and leak. Both methods are temporary “Band-Aids” only.

An Easy Way to Save Money – Hiring a contractor to repair a troublesome foundation crack can be costly. Using the the RadonSeal® DIY and PRO Foundation Crack Repair Kits makes crack repair quite easy and inexpensive. Successfully used by thousands of homeowners and contractors, low-pressure crack injection fills the entire depth and length of the crack and stops water leaks permanently!

Customer Testimonials

  • NO NEED TO EXCAVATE – Save serious money by repairing the crack from the inside out.
  • NO DRILLING REQUIRED – The low-pressure injection method eliminates the need for drilling.
  • HAIRLINE CRACKS – Low-viscosity urethane is ideal for the repair of hairline cracks.
  • NO SPECIAL TOOLS REQUIRED – The kits ship complete. All you need a standard caulking gun to inject.

Why These Foundation Crack Repair Kits Work the Bestpolyurethane foam

The RadonSeal® D-I-Y Foundation Crack Repair Kits use the same two-component polyurethane or epoxy for injection as our professional toolkits for contractors. Two-component injection polymers are used by practically all contractors because they provide a superior crack repair that will last forever. No special skills are required - just a little bit of patience on your end.

Did You Know? Cheaper kits use single-component, hydrophilic foams that absorb water but eventually crumble after repeated drying.

Once injected, our proprietary, two-component polyurethane expands forcefully to fill the entire crack with hydrophobic foam that repels water and WILL NOT BREAK DOWN, as proven over many years. Your foundation crack will never leak again because the crack has been sealed entirely meaning water will never get into it.

Got the Damp Basement Blues? Learn How to Dry Out a Wet Basement

Our Do-It-Yourself Crack Foundation Repair Kits feature internally split dual-component cartridges. Each crack injection kit comes complete and ready to use, allowing you to fix cracks like a pro but without the labor cost (average labor cost for repairing a foundation crack is $250+).

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Not Sold In Stores but shipped directly from the factory to your door. Orders received by 2 pm ET are normally shipped the same day and UPS® or FedEx® Ground delivers within 2 to 5 working days in the lower 48 states. Based on shipping by courier to the lower 48 states. For expedited shipping or shipping to other states and Canada, please inquire first by e-mail or telephone. For secure and encrypted online processing of your order, click Order Online - all major credit cards accepted. You can also order with your PayPal account. Or simply phone your order in. Our DIY Concrete Repair Products are also available through

RadonSeal® Do-It-Yourself Foundation Crack Repair Kits
Product Price Shipping  
D-I-Y Foundation Crack Repair Kit $114 $11 Order Now button
Easy-Peel D-I-Y Crack Repair Kit $135 $11 Order Now button
   D-I-Y Crack Repair Kit - Epoxy $199 $12 Order Now button
   Easy-Peel D-I-Y Crack Repair Kit- Epoxy  $221 $12 Order Now button
PipeTite™ Gap Filler Kit $69 $7 Order Now button


Which Kit Should You Use, Polyurethane or Epoxy Injection?

Epoxy injection was originally developed to repair cracks in large concrete structures. Since epoxy is stronger than concrete, it provides a structural repair. However, you cannot hold a house foundation together by "gluing" a moving structural crack – another crack would soon develop. Structural cracks in basement walls are typically horizontal. If you have a crack that still keeps moving, consult a structural engineer.

crack foundation concretePOURED CONCRETE FOUNDATION? USE THE POLYURETHANE! – Most basement cracks have already stabilized and just need stopping or preventing water leaks. They are usually diagonal and many start in the corner of a window. Such cracks are best repaired with expanding polyurethane polymer. Polyurethane foam remains flexible and allows for the natural movement of concrete. Contact with water helps it forcefully expand up to 20 times its volume. The crack should be wet inside but not actively leaking.

Each DIY Kit includes two internally split two-component cartridges of polyurethane and mixing nozzles to ensure proper mixing while injecting. The expanding foam will fill the entire length and depth of the crack, as well as voids behind the wall. Water will never find the crack again.

Click for Foam Data Sheet and Foam MSDS

EPOXY INJECTION – Injectable epoxy does not only stop water but also provides structural strength. Its strength and bond with concrete exceed the strength of the concrete itself. It prevents further elongation and yawning of the crack. However, if the underlying cause of the structural stress is not resolved, a new crack may develop right next to the repaired crack. The surfaces inside the crack must be dry for epoxy to adhere.

The epoxy injection kit includes four two-component epoxy cartridges for crack injection. This fills a volume of 60 cu. in. – a crack 8' long and on average 1/16" wide in a wall 10" thick (8'x12 x 1/16" x 10" = 60 cu. in.). Epoxy does not expand. It is suitable for hairline cracks but if the crack is wider, it requires proportionally more epoxy. Epoxy cures slowly and if there is a void on the outside, epoxy will run out and "disappear." This special hydrophobic epoxy is also suitable for damp cracks.

SURFACE SEALER (Standard Epoxy or Easy-Peel) – You also have the choice of the standard epoxy surface sealer when the wall will be framed in but if appearance matters, use the Easy-Peel version which the surface sealer can be easily removed after the repair.

PRO CRACK INJECTION KITS – If you have more than 20 linear feet of cracks, it will be more economical to purchase our Professional Foundation Crack Repair Toolkit. These kits include a professional caulking gun, which makes the job even easier.

COVERAGE – 8-10 linear feet of cracks in poured concrete walls from hairline to 1/2" wide (up to 22" thick walls).

Both the urethane and epoxy kits allow homeowners to repair cracks just like the pros but at a much lower cost. Make repairs to a variety of cracks;

  • Leaky Floor-To-Wall Joints (alternatively you can use the ElastiPoxy Joint & Crack Filler Kit)
  • Underground Walkout Stairs (abutting the foundation)
  • Narrow Cracks in Concrete Ceilings and Slabs
  • Gaps between the Foundation Wall and Sill Plate
do-it-yourself crack injection kit Easy-Peel crack injection kit PipeTite Gap Filler Kit
DIY Crack Injection Kit (polyurethane or epoxy) DIY "Easy-Peel" Injection Kit (polyurethane or epoxy) PipeTite™ Gap Filler Kit (polyurethane)

Application – DIY Crack Injection Kit (standard version)

The standard D-I-Y Foundation Crack Repair Kit contains two jars of the two-component epoxy Surface Sealer and Port Adhesive. After "gluing" on the injection ports, spread the Surface Sealer over the crack. When the crack repair has cured, knock off the injection ports. The gray epoxy layer stays on the surface but it can be removed with a chisel or grinder.

Review our detailed Polyurethane Crack Repair Guide (PDF)

Application – DIY 'Easy-Peel' Crack Injection Kit

If appearance of the finished repair matters, the Easy-Peel Surface Sealer provides the best solution. It is packaged in two-component split cartridges for precise mixing. No guessing or mixing by hand. Each Easy-Peel Foundation Crack Repair Kit contains two Easy-Peel cartridges. After the repair, simply peel off the surface seal together with injection ports all in one piece. It leaves a neat and clean concrete surface.

Practice Patience – During the injection, squeeze the caulking gun very gently with only about 20 lbs. of pressure to allow the polyurethane to penetrate into hairline cracks and the foam to expand. This means spending 2-5 minutes on each port.

Actively Leaking Cracks – This is low-pressure injection so wait until the leak subsides. Running water prevents the surface sealer, as well as the injected polymer, from adhering properly in the leaking area. Or, hire a contractor who can use the high-pressure injection method.

Hairline Cracks: Heating up the polyurethane lowers its viscosity further and makes the injection easier into hairline cracks. Fill a pot with hot water and submerge the urethane cartridges for about 15 minutes.

Above-Grade Cracks: If there is a void on the other side of the crack, the polyurethane foam would wastefully expand into the air. Seal the other side of the crack first with caulk or the surface sealer.

Corner Cracks: The base of each injection port has pre-cut slits. Just fold the base and hold the port in the corner until the glue holds. Or just cut the base off. You can also request that we ship corner ports only.

Extra Material: If there is a large void behind the wall, it will consume more polyurethane foam, typically in the lowest injection port. You can order additional cartridges by phone.

SHELF LIFE: 1-YEAR. Unopened kits in salable condition are returnable. Review our Commercial Terms.


PipeTite Gap Filler Kit - The Permanent Solution for Sealing Concrete Penetrations

The size of the holes drilled through foundation walls is always a size larger than the pipes and workers just stuff some mortar into the void. Over time, the mortar will inevitably deteriorate and start leaking water. These recurrent water leaks are an endless nuisance to many a homeowner. Hydraulic cement does not stick to pipes and caulk will get loose.

concrete hole repairThe PipeTite Gap Filler Kit provides a permanent solution for pipe penetrations through poured concrete walls. It is very similar to the D-I-Y Foundation Crack Repair Kit but smaller. The polyurethane foam tenaciously adheres to concrete, plastic, and metals. It beats caulking, mortar, hydraulic cement, or patching compounds. It will never separate, peel, or leak – it is permanent!

The expanding polyurethane will fill the entire gap around the pipe and water will never get in again. It also protects the concrete by preventing water from getting inside the gap. All you need is a common caulking gun.

Application is very similar to crack injection:

First, glue on one or more injection ports around the pipe and enclose the gap with the surface sealer. Let cure and inject the polyurethane polymer, which forcefully expands and fills the entire void with polyurethane foam. In case there already is solid mortar, you can drill holes through it with a masonry bit and inject the polyurethane sealant through it.

Form wire ties: These steel wires or rods hold the forms together when foundation walls are poured. But once the exterior waterproofing breaks down, water attacks the form ties, making them rust or fall out. Water starts squirting into the basement. Caulking or patching are only temporary fixes. Glue an injection port right on top of the hole and inject the PipeTite expandable urethane to fill the void and stop the leak permanently.