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RadonSeal Concrete Foundation Crack Repair Kit 10ft - Foam Filler & Injection Sealer for Cement Walls

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$154.00

$ 66 .99 $66.99

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About this item

  • Drill-Free Crack Repair: Advanced two-component low-pressure injection creates a durable, watertight seal that permanently repairs hairline cracks from the inside, eliminating the need for expensive repairs.
  • Heavy-Duty Coverage: Low-viscosity urethane is specifically formulated to penetrate and seal even the smallest hairline cracks, ensuring a long-lasting permanent seal.
  • Water-Resistant Seal: Formulated to remain flexible, accommodating natural concrete movement while its hydrophobic properties repel water, soil gases, and even radon, preventing shrinkage and deterioration over time.
  • Easy to Apply: Easily apply the low-viscosity, two-component urethane using a standard caulking gun for professional-grade crack repairs with minimal effort.
  • Trusted Quality: Engineered for professional-grade performance, RadonSeal products are proven to provide reliable quality and durability, ensuring strong, lasting results for foundations, walls, basement floors, and more.
  • Use What the Pros Use: Save time & money using the same expanding foam crack filler used by waterproofing contractors.



Product Description

RadonSeal DIY Foundation Wall Crack Repair

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Repair ‘em Like the Pros

Hiring a contractor to fix a leaky foundation crack can be costly, but RadonSeal DIY Foundation Crack Repair Kits provide an easy, affordable solution.

The low-pressure polyurethane injection expands to fill the entire crack, blocking groundwater leaks from the backside. No special skills are needed – just use a standard caulking gun and some patience.

Made with the same professional-grade, two-component polyurethane used by contractors, these kits ensure a flexible, waterproof repair that lasts. Once sealed, groundwater won’t find its way back.

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Complete Kit for a Seamless Repair

The kits ship fully equipped with all the necessary materials to seal up to 10 feet of cracks in poured concrete walls, ensuring a hassle-free, professional-quality repair.

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Use a Standard Caulk Gun

No special tools are needed to apply the material – just a standard caulking gun to inject the polyurethane foam and seal the crack effectively.

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Need to Repair More Than 10 Feet?

We offer kits in both 10-foot and 20-foot sizes, ensuring you have the right amount of material for your repair. Note: Single cartridges are sold separately.

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Do It Right. Do It Yourself.

Repairing cracks in poured concrete foundation basement walls has never been easier with RadonSeal DIY Foundation Wall Crack Repair Kits. Designed for homeowners, these kits use the same professional-grade, two-component polyurethane trusted by waterproofing contractors. Easily seal basement wall cracks yourself and prevent water leaks, saving you hundreds on foundation crack repair compared to hiring a contractor.

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Flexibility Matters

Many low-cost crack repair kits use single-component, hydrophilic foams that absorb moisture and deteriorate over time. RadonSeal DIY Foundation Wall Crack Repair Kits provide a superior, long-lasting solution with a proprietary, hydrophobic, two-component polyurethane designed specifically for sealing cracks in poured concrete walls. Upon contact with water, the polyurethane expands up to 35 times its volume, ensuring deep penetration into the crack for a watertight, flexible seal. This flexibility allows it to withstand foundation movement without breaking down, making it an ideal choice for permanently sealing basement wall cracks and preventing water leaks.

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Foundation Crack Repair Made Easy

Why pay for expensive professional repairs when you can permanently seal foundation cracks yourself? RadonSeal Foundation Crack Repair Kits are designed for easy, do-it-yourself application, requiring no special skills or experience. With clear, step-by-step instructions, all you need is a little patience and a couple of hours to seal cracks in poured concrete walls like a pro. Plus, if you ever need assistance, our team of experts is ready to guide you through the repair process. Stop water leaks, prevent further damage, and protect your home’s foundation.

Protect Your Home – Repair Basement Foundation Cracks Before They Worsen

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Waterproofing

Sealing basement wall cracks is key to protecting your home from water damage. Over time, cracks allow water to seep into your basement, causing moisture buildup, flooding, and potential structural issues. By sealing these cracks, you create a waterproof barrier that keeps your basement dry and preserves the integrity of your home. Proper crack sealing protects against water damage, ensuring a safer, healthier living space.

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Radon Mitigation

Sealing basement wall cracks is an essential step in protecting your home from the harmful effects of soil gases. Cracks in your foundation can serve as entry points for radon, a colorless, odorless gas that can seep into your basement and may pose health risks over time. Proper crack sealing helps block easy pathways for radon gas to escape while also improving the overall energy efficiency of your basement.

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Pest Control

Sealing basement wall cracks is crucial for preventing pests from entering your home. Cracks in your foundation create easy entry points for rodents and other unwanted critters that can cause damage. By properly sealing these cracks, you eliminate their access, creating a more secure and healthy environment.

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I have a horizontal crack. Can I still use the kit?

Most settling cracks are typically vertical or diagonal, which our kits are designed to repair. However, horizontal cracks in basement walls can be structural in nature and may require expert evaluation. For horizontal cracks, we recommend consulting an experienced contractor to assess the issue and determine the appropriate repair method. Therefore, we do not recommend using our kits for horizontal cracks without professional guidance.

Can I use these kits for repairing cracks in concrete block walls?

Our kits are specifically designed for repairing cracks in poured concrete walls. For cracks in hollow-core block foundation walls and mortar joints, we recommend our ElastiPoxy Joint & Crack Filler Kit. This two-component epoxy can be mixed with sand to create a strong, durable filler that effectively bonds and reinforces cracks in block foundations.

Can the kits be used for sealing slab and floor cracks?

Our kits are specifically designed for repairing cracks in poured concrete walls and are not recommended for slab or floor cracks. For sealing and structurally bonding cracks in concrete floors, we recommend using our CrackWeld Concrete Floor Crack Repair Kit.

Is it possible that I may not have enough material to fill 10 feet of cracks?

Each kit includes all necessary components to cover the specified coverage area. However, in some cases, additional urethane may be required to complete the job. Factors such as loose soil, voids behind the wall, wider-than-expected cracks, or cracks extending down to the footing can consume more urethane than anticipated. If more urethane is needed, individual cartridges—along with a new hose assembly, restrictor, and mixing nozzle—can be purchased separately.

I was only able to repair half the crack. Can I continue filling it later?

Yes, if you're unable to complete the injection process in one session, you can resume at a later time. The urethane is designed to bond to itself, ensuring a strong and continuous seal even if the application is paused.

Can the kits be used for sealing corner cracks?

Yes, the kits can be used to repair corner cracks. The injection ports are designed with a scored base, allowing them to be carefully bent for a better fit in tight corners. When placing the ports along a corner crack, hold them in place for a few extra moments to ensure the surface adhesive properly secures them.

Can I repair the crack if it is actively leaking water?

No, actively leaking water can interfere with the adhesion of the surface seal and the effectiveness of the injection process. Before proceeding, wait for the water flow to subside.


R. Lang
Reviewed in the United States on February 19, 2025
Vertical foundation crack that (very occassionally) leaked when we had very saturated ground. Kit advertises it will handle a 10 foot crack - easily handled the 8+ feet I had to treat. Good instructions and included everything needed, except the caulk gun. Before and after photos give you a good idea. I didn't do the work myself (relied on trusted contractor), but probably could have. The "crack guys" typically charge about $500+ per 10 foot crack for pretty much the same result. Kit was about $180 and if you do it yourself, I thnk you'll be pretty darn happy.
N
Reviewed in Canada on September 16, 2024
Product worked well. Nice kit. The epoxy sets quickly, so some mild skill required here.. mix small amounts. However, I’m really happy with the epoxy itself. I put the hose by the crack after the epoxy dried and the epoxy alone stopped the water. I then slowly and patiently injected the polyurethane. I ran a soaker hose by the crack for a while and no water came through! I’d use this again. Note, I did grind open the crack with an angle grinder and used masonry drill bits to create deeper holes in the crack at the injection sites (not in the kit).
Michael Unrau
Reviewed in Canada on March 5, 2024
The Polyurethane seems to be working.But, someone attempted a repair on this crack previously and the opening of the crack was large. I had a difficult time gluing on the ports and the quantity of epoxy was insufficient. I tried filling the crack with other things but it did not work well. I had Polyurethane and foam oozing out all over which makes quite a mess. This kit should have 2x the amount of epoxy. If you have a large crack like this one then expect to need more.Also, they provide a small squirt bottle for flushing the crack after all the ports are glued on. This bottle is useless. I found a funnel that fit snuggly to the provided hose and dumped the water in. This worked much better. Also, the Polyurethane tube don't fit in my caulking gun. I managed to force them in, which was annoying.I went to my local Mcmunn & Yates to look for more epoxy or a substitute. In the process, I found concrete crack repair on the shelf. If I need to repair a another crack, I will skip this kit and buy from my local store.The polyurethane turns to foam and does fill the crack but overall, I'm not impressed with the kit.
Marvin P. Cruz
Reviewed in the United States on November 15, 2024
I used this product to seal a leaking crack in my poured concrete basement wall... During a recent 5+" rainfall, the crack leaked... Even though the repair seems intimidating to perform yourself - it was pretty straight forward and went as planned except for one caveat... The crack I had was roughly half underground (below grade) and half above ground... When I injected the expanding foam into the ports - below grade was fine, but when I got to the above ground portion of the crack - the expanding foam seeped out on the outside while I was injecting (because nothing on the exterior to hold it in)... I have attached a picture of the crack outside underneath my deck for a visual reference... If I had known - I would have placed duct tape along the crack on the outside to keep the expanding foam from seeping out while I was injecting... Because of this seepage, I ran out of the expanding foam - yet still had last couple of feet or so to go... Other than that - it works well and not hard at all to perform... One last note - even though it is low VOC - it does stink - so knowing this from reading the reviews prior to installing - I rented an air scrubber and ran it during the install and the following day to mitigate the smell from infiltrating the rest of the house and worked out extremely well... I would recommend this product...
Mark
Reviewed in the United States on June 26, 2023
Great foundation repair kit. Read the instructions a couple of times and plan ahead. Its not as intimidating as you might think. Had a crack in poured foundation about 13 years old, was there since the house was built and leaking slow. Finally got around to fixing it and the process was pretty easy. I had an 8 foot crack from floor to top of foundation from 1/16" wide to 1/4 in places near the top.Couple of tips, some others have mentioned:Wear 2 pairs of gloves its way easier to change glovesBuy more gloves - you will need themHave paper towels and old rags ready this stuff does make a messWarm up the injection foam in a tub of hot tap water for 30 mins prior to injectionUse just a little but of part A/B at a time and go slow to ensure no leaks around portsWhen placing ports start from bottom and work your way up, when pressing ports on make sure you dont clog the hole and smooth out the excess that squeezes out around the port. This makes the next step easier and prevents a lip of epoxy around the portUse a pump garden sprayer to flush the ports very well. Did not try the bottle supplied I knew it would be too challengingAfter placing ports from bottom up start covering crack and ports from bottom up as well. Dont start on the last port freshly placed because the epoxy needs a few mins to set up and moving the ports can cause them to shift, start from the bottom again on the ports that have had a few mins to set upOverall this kit worked very well and saved me some cash. Had rain a few days after completion and no leaks. I used about 75% of the epoxy and injection foam on my set up details above. Your mileage may vary.
Brandy Maisine
Reviewed in Canada on April 2, 2023
Overall it was great to use. When it comes to the mix that is used to attach the ports and cover the crack I think if you were going to get 10 feet out of it you would have to really use it sparingly. One tip I found that worked really well was to soak the injection tubes in warm/hot water before using. It made it flow really easy into the ports and then into the crack. I would definitely use this again especially where it has everything you need.
Customer
Reviewed in Canada on December 2, 2021
Was quoted 2K for two foundation cracks.. After speaking with a friend, he sent a youtube video showing how to do it... It looked relatively easy (I am not a handyman type, more of a computer geek) but I figured I would try... Needless to say, it was easier than I thought and the results were amazing. A few days after completing the repair we had some crazy rain, and all was dry as a bone... VERY HAPPY.
Customer
Reviewed in Canada on August 30, 2020
I purchased this set because of the epoxy crack filler used instead of the quickcrete type fast setting cement that came with some other similar kits. Overall the kit was easy to use and I was able to fill a 1/8” crack that ran from floor to a basement window about 7’ up. I used most of the two tubes of filler with a little left over.So far no more water leaking since filling the crack.
FC80504
Reviewed in the United States on July 23, 2018
Had a hairline crack in basement wall that seeped every time it rained--and it rains a lot in our PA location. Selected Radonseal polyurethane based on a lot of research and the recommendation of a friend who is in heavy construction (highway overpasses, bridges, etc.) He knew exactly what I told him about (Oh yea. We use that @#$% all the time!") A couple of key things I focused on prior to using the product was prepping the wall. I removed all of the material applied by the previous owner (without success), including epoxy paint, hydraulic cement, roofing tar, caulking, and whatever else--about 15 pounds of material from a bulge of repeated attempts. It looked so bad I originally thought the form blew out, only to find he just put more material on top of the old. Took it all the way down to the original poured wall which was flat, including grinding (a mess) to make sure I removed everything that was stuck on from before. I washed the,are with Dawn (a miracle product) dish soap and water, and when that dried, I washed it down with a sponge and rubbing alcohol to get it as clean as possible. In the area where it leaked the most, I took a small concrete drill bit, set the bit two inches from the crack and drilled 45 degrees every eight inches to intersect the crack (I know you don't have to do this, but I thought I could get more of the polyurethane back into the crack. Since the crack was not the entire height of the wall, I figured I would take advantage of the extra nozzles available.Before I started, I made ten 8" X8" mixing boards for the epoxy. You can only use about a 1/2 teaspoon each of the black/white epoxy before it hardens, so better to use less and mix more often. As mentioned by others, the wooden spreaders that come with the kit are too flimsy, so I used plastic knives (picnic utensils) that worked much better. Mixed it up, set the nozzles, then pasted the crack as directed. Waited a full two hours for the epoxy to set.I glued the nozzle to those ports that I had drilled over 2-1/2 feet of the crack, and placed nozzles over the crack as directed. Prior to gluing the nozzles to the wall, I washed it down again with rubbing alcohol, and used a heat gun to get it dry as possible.Used the water bottle provided, and flushed each nozzle and crack from top-to-bottom until clear water flowed. (Note, not all nozzles would communicate to the nozzle below it, but made sure every nozzle took a lot of water (the water is what causes the polyurethane to expand--so don't skimp on the water flushing). I must have used six bottles of water to get al 15 nozzles flushed. I know some people mentioned they had problems with the injection tube leaking. My set up worked flawlessly following the directions provided. Started at the bottom nozzle as directed--figuring a minimum of four (4) minutes at each nozzle. The flex tube attaches very tightly to the nozzle--so that all worked well.At each nozzle I would pump first for 30 seconds, then wait 30 seconds, then pumped again for ~15 seconds until I could no longer pump into the crack. I held constant pressure on the gun the entire time. I figured this would allow the polyurethane to penetrate and begin to set before I pumped again. In some cases I could pump after the second time. In the part of the crack that seeped the most, it took a lot of poly during the first 30 second pump. After the first 30 seconds of pumping and ten waiting 30 seconds, it surprised me at how much more material it would take (I wonder how much poly set up on the outside of the wall?). After the second 30 second pumping it began to be more difficult to pump. Pump 30-Wait 30-Pump 30....and then it tightened-up significantly. I barely got a third pump into the nozzle, and then held pressure on it for about another 2 minutes. Tried to pump again but could not do it. Moved up to the next nozzle. Same process for the next nozzle in the high seep area, but couldn't pump into it for as long as the first, and the poly fluid started to seep from the nozzle above (I considered this good). Finished up the balance of the nozzles, drained all of he hoses, cleaned-up and called it good. I had about 3/4 of a tube remaining that I decided to save in the event I need to repeat the process.Note: I had a couple of nozzles "blow out" at the edge where the nozzle is attached to the wall. Looks as if I did not get the epoxy spread thick enough. Then again, when the poly begins to expand, it's extremely dense and it has to go some where. I also had poly push out the nozzle cap on two nozzles. I thought this was a positive, in that I had enough poly in the crack that it had no where to go but out towards the nozzle (the weakest point).Next day I removed the nozzles and started to remove the epoxy from the crack as shown in the video CD. After about 15 minutes, and a lot of hammering and chiseling, I called it for the day (or life?) Stuff is damn tough to remove, a lot of work, and a huge mess. Cancelled! Done! I thought about grinding it off (for about 10 seconds) but the epoxy dust is not something I want in my home, so that won't happen either. Per the recommendations of other users on here, use the gloves and lay down a large sheet of plastic. As for the gloves. I would put two pairs on at one time, that way when the outside pair gets nasty you just peel them off and the new pair is there. I used a couple of extra sets of gloves (two pairs to apply the epoxy, another two pairs to apply the polyurethane (as you get the polyurethane on your hands when inserting the plug into the nozzle as they drip when you remove the injection tube.) Give yourself plenty of room to work, and take your time.BTW, the epoxy and hardener when mixing is extremely foul-smelling. Make sure you are in an area that is ventilated as it is pretty nauseous.Report after three weeks. We have had three major storms of 3", 2.5" and 2 inches and some minor rains of 1/2" or more. Previously, the wall would have seeped with each and every rain. Since I used the Radonseal product--nothing. No seeping, not even a sweating where the crack is. I can tell you from past experience I would have had some water puddle on the floor, or in the lighter rains some sweating on the crack --but after the treatment, nothing. The wall is completely dry from top to bottom.