Do-It-Yourself Foundation Concrete Crack Repair Kits

Foundation Crack Repair Made Easy for Homeowners

If you're a homeowner that has settling cracks in your concrete foundation wall, you're not alone! Most homes, both new and old, will develop some foundation cracks eventually. If the cracks aren't leaking now, it is only a matter of time that they will as exterior waterproofing membranes gradually deteriorate over time. If your basement cracks are currently leaking, now is the time to repair them to avoid further water damage and possible mold growth in the basement.

Many homeowners have learned the hard way that when it comes to repairing a crack in a basement wall, materials such as caulk, hydraulic cement, and patching compounds do not last forever. Caulk shrinks and will eventually lose adhesion and its bond with the concrete. Hydraulic cement does not bond well to concrete and because it is a rigid material (like patching compounds), that natural movement of concrete will cause it to separate and leak again. All these types of waterproofing repairs are considered temporary "band-aids" only.

RadonSeal Do-It-Yourself and Contractor Crack Reapir Kits

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

Save Money By Repairing the Crack Yourself – Hiring a crack repair specialist to visit your home and repair a leaky foundation crack can be costly (the average cost around $450 per 10-ft. crack). Using the RadonSeal Foundation Crack Repair Kits makes repairing cracks in poured concrete walls easy and inexpensive. All you will need is a standard caulking gun!

These kits have been successfully used for over 20-years and used by thousands of homeowners and basement contractors. Low-pressure crack injection repair works by filling the entire depth and length of the foundation crack (8-10' high) to stop water leaks permanently!

Why These Foundation Crack Repair Kits Work the Best?

Our line of DIY Foundation Crack Repair Kits uses the same two-component polyurethane (or epoxy) for injection as do our professional toolkits for contractors. Two-component injection polymers are used by practically all waterproofing contractors because the material provides a superior repair that will last forever! The kits are user-friendly and no special skills are required. Just a little bit of patience on your end and a couple of hours of your time.

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

Once the urethane has been injected into the damp crack, the proprietary, two-component polyurethane expands forcefully (2-3 minute reaction time) to fill the entire depth of the crack with hydrophobic foam that repels water and WILL NOT BREAK DOWN (as proven over many years). Once the urethane has cured, the foundation crack will never leak water again because the crack has been sealed entirely (meaning water will never be able to enter the crack from the backside).

The DIY kits feature internally split dual-component cartridges and mixing nozzles to ensure proper mixing when it is time to inject. The kits ship complete and are ready for use! Allowing you to fix cracks like a pro, without having to pay someone to do it for you.

Learn How to Dry Out a Wet Basement

polyurethane foam

Order Your Kit Today

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  
DIY Foundation Crack Repair Kit | Urethane | 10-ft $139 FREE Order Now
DIY Foundation Crack Repair Kit | Urethane | 20-ft $259 FREE Order Now
Easy-Peel DIY Crack Repair Kit | Urethane| 10-ft $169 FREE Order Now
Easy-Peel DIY Crack Repair Kit | Urethane| 20-ft $318 FREE Order Now
DIY Foundation Crack Repair Kit | Epoxy | 10-ft $259 FREE Order Now
Easy-Peel DIY Crack Repair Kit | Epoxy | 10-ft $289 FREE Order Now
PipeTite Gap Filler Kit $79 FREE Order Now

SHIPPING - 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. Delivered via FedEx® Ground within 1 to 5 working days to the lower 48 states. EXPEDITED SHIPPING – For expedited shipping, shipping to Alaska, Hawaii, or Canada please inquire first by email or phone.

NEED EXTRA MATERIALS? 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.

DIY Foundation Crack Repair Kit DIY 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

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:

  • Underground Walkout Stairs (abutting the foundation)
  • Narrow Cracks in Concrete Ceilings and Slabs
  • Gaps between the Foundation Wall and Sill Plate
  • Leaky Floor-To-Wall Joints (alternatively, you can use the ElastiPoxy Joint & Crack Filler Kit)

When to Use Polyurethane Injection

We recommend using the polyurethane kits for sealing and waterproofing non-structural cracks in poured concrete walls. These low-pressure injection kits are best used on wet, damp, or leaking cracks.

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.

Did you know? Structural cracks in basement walls are typically horizontal. If you have a crack that continues to move, consult a structural engineer.

Most cracks in poured concrete foundations have already stabilized and simply need to be repaired to prevent water from leaking through. Basement wall cracks are commonly vertical or can be diagonal, and many start in the corner of egress windows. These cracks are best repaired using the expanding polyurethane polymer. The reason polyurethane foam is used is that it remains flexible and allows for the natural movement of concrete. Contact with water helps the urethane to forcefully expand up to 20 times its volume filling the entire length and depth of the crack, as well as voids behind the wall. Water will never find the crack again!

crack foundation concrete

When to Use Epoxy Injection

Epoxy injection kits can be used for repairing wider cracks (>1/4") or when added strength is needed.

Injectable epoxy does not only stop water but also provides structural strength. Epoxy's strength and its bond to the 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.

Did you know? This special hydrophobic epoxy is suitable for use inside damp cracks.

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.

...poured cement wall cracks (hairline vertical) to stop water leaking into my finished cellar. This is by far the best DO IT YOURSELF I've ever came across. ...Contractors quoted me $650.00. .... Ray B., NY

...the absolute best thing on the market for repairing leaking cracks in poured foundations ... my 12-year old son could've performed this repair ... I did the old "back cutting and fill with hydraulic cement" repair only to find water again seeping through only 6 months later... Al D., Western NY

...amazing results from using your products. Last year I injected several cracks in my foundation, as well as a leaking pipe perforation. My basement has been completely dry ... it reduced my radon levels below the limit.. ... Bob B., MO

See more Testimonials

Customers' feedback and tips on Repairing Cracks in Concrete Walls and Floors

Application Videos

RadonSeal DIY Concrete Crack Injection Kit | URETHANE – 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 can be removed with a chisel or grinder. Review our detailed Polyurethane Crack Repair Guide.

RadonSeal DIY Easy-Peel Concrete Crack Injection Kit | URETHANE – If the 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.

Tips for Reparing a Leaky Basement Wall Crack

PRACTICE PATIENCE – During the injection, squeeze the caulking gun very gently with only about 20 lbs. of pressure to allow the polyurethane to penetrate hairline cracks and the foam to expand. This means spending 2-4 minutes on each port.

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

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 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.

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.

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

Click for Expanding Injection Foam Product Data Sheet and Foam SDS

Read about Cracks in Basement Walls

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.

The 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.

concrete hole repair