My basement had multiple cracks (no comments about my builder's skills). This product stopped leaks completely. Now I can install drywall. I bought the crack repair kit on Amazon, but I needed more co... See more
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A reasonable and helpful company. They answered questions, and assisted finding right product. The product isn't cheap, not expensive either, but works as it should. They provide plenty of documenta... See more
The customer service over the phone was amazing. The gentleman I talked to walked me through all the products I had questions on for 45min. He did not try to upsale me and even talked me out of one of... See more
Company replied
Fantastic product and support. Especially happy with Mike, who patiently answered my questions on multiple occasions and helped me find the right product for my project. The concrete sealant for my... See more
Company details
Written by the company
It happens to thousands of homeowners each year – the sale of their home falls through because of high radon in their basement. They have to hustle to get a radon mitigation system installed and hope that the buyer will not walk away. But for many years after, they may wonder about the long-term effects of the radioactive gas on their children. Since radon gas seeps into basements from the ground, the US Environment Protection Agency had tested the obvious solutions back in the 1980's – caulking all cracks and sealing the concrete with various coatings but the improvements were not significant or lasting. Thus, the fan-based system which draws soil gases from underneath basement slabs became the standard. There had to be a better way! Novion Inc. was founded in 1987 to pursue innovative high-tech solutions. Penetrating concrete sealers, already well-proven for waterproofing concrete on major projects, seal concrete internally and permanently. Perhaps, they could be improved to penetrate deeper and seal even tighter to keep out the single-atom radon gas. After extensive research and testing, the first concrete sealer specifically developed to reduce radon infiltration through concrete was ready for the big debut – RadonSeal® Deep-Penetrating Concrete Sealer. Novion Inc. was incorporated in Connecticut and RadonSeal was made available directly to homeowners and contractors on radonseal.com website. Subsequently, we have continued to add unique innovative products, not available in stores, for basements, indoor or outdoor concrete, bricks, pavers, and masonry. Going beyond radon remediation, we provide durable and cost-effective solutions for waterproofing basements, sealing concrete slabs against vapor, and mold remediation. Our products also protect and beautify indoor or outdoor concrete, pavers, and masonry. Our mission is to supply cutting-edge, professional-grade, and environment-friendly products, superior to those sold in stores. Our customer support offers technical expertise and objective guidance on the best solutions for customers' needs. Whether you are a homeowner, contractor, or building owner, we will provide the top-quality products and service to solve or prevent problems with your basement, parking lot, pool deck, brick or masonry walls. It can be just a matter of time before your basement or outdoor concrete starts giving you problems. Act now and give us a call. We are here to help!
Written by the company
Contact info
494 Bridgeport Ave, Ste 101336, 06484-4748, Shelton, United States
- 203 225-0366
- admin@radonseal.com
- radonseal.com
4.6
Excellent
2K reviews
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This company invites their customers to review, whether positive or negative
Replied to 36% of negative reviews
Typically replies within 24 hours
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This stuff is great
This stuff is great. I've now sealed two long cracks in my basement foundation. One crack was hairline--the tip to warm up the urethane in a bucket of hot water helped immensely. I called for some advice on what product to order, and they were great on the phone as well. Thanks!
11 March 2026
Very responsive customer service
Very responsive customer service. Should make your website be more easy to search. Also, the polyurethane is only half filled.
26 March 2026
DryWay Plus- Another great product
Ordering the DryWay Plus was fast and easy. They shipped within 24hrs as well.
I've used Radon Seal products before to finish, seal and stain my basement and they work great along with their epoxy for cracks
Their customer service is also very helpful! Highly recommend this company and their products.
26 March 2026
great product always get so fast
26 March 2026
I’ve been researching a lot about…
I’ve been researching a lot about cracked foundations , and your polyurethane products outperform any other products on the market , the only downside was trying to get answers back by email , I’m a busy person but eventually had time to call , and as very helpful for me
24 March 2026
I had some questions about which kit
I had some questions about which kit I should buy. Greg/Craig was very helpful! He answered all my questions.
22 March 2026
Great product
Great product! Instructions are on one page and easy to follow. I repaired three larger vertical cracks as a first time user. Order was shipped fedex and arrived in couple of days. Saved thousands over hiring a contractor who may not use same quality materials.
9 March 2026
Spent two hours on the phone with my…
Spent two hours on the phone with my credit card company because of the website not functioning properly. Product did not go nearly as far as advertised.
18 March 2026
Water leak
Customer service was very answered all the questions I had gave me a couple things to look for while installing the product.
12 March 2026
The product did not do what it says and…
The product did not do what it says and I had a terrible experience applying it, as well as, terrible results.
2 March 2026
Patio Sealer
Was able to compare products easily and order a sample to see how it works before ordering. The free shipping was great.
6 March 2026
Buying was easy
Buying was easy, delivery was quick.
I found the A & B epoxy difficult to use, hard to mix and short pot life.
5 March 2026
Fast feedback and helped to resolve the…
Fast feedback and helped to resolve the problem. Will definitely buy again when I need more cracks repaired.
3 March 2026
Service was very good
Service was very good. Easy site to navigate. Deliver was fast.
26 February 2026
I left an earlier review when I was…
I left an earlier review when I was frustrated and couldn’t amend it so here’s another….
Product performs wonderfully!!
I needed some guidance after the initial application. A rep reached out and even called me back to make sure all was satisfactory. Definitely recommend Radon Seal
20 February 2026
Needed more urethane foam
I've been repairing cracks in my basement and ran out of the urethane foam but still have plenty of epoxy and injection ports. I was happy I could buy more urethane foam complete my project. The package was well packed and shipped quickly!
12 February 2026
Reply from RadonSeal
Thank you for your review!
We’re glad you were able to get the additional urethane foam needed to finish your project, and that everything arrived quickly and well-packed.
We appreciate your business and are here if you need anything else.
Kind Regards,
---------------
Customer Support
RadonSeal
Arrived quickly and in good condition
11 February 2026
Reply from RadonSeal
Thank you for your feedback!
If you need any expert assistance, please don’t hesitate to reach out.
Kind Regards,
-----------------
Customer Support
RadonSeal
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