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
Could call and get information on products from a REAL PERSON!!! No AI- please keep it that way!!!! They are so knowledgeable and patient with all questions and concerns.
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
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Company details
- #9 of 44 best companies in Home Improvement Store
- #1 of 1 best companies in Finishing Materials Supplier
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
4.7
Excellent
2K reviews
Asks customers to review
This company invites their customers to review, whether positive or negative
Replied to 55% of negative reviews
Typically replies within 1 week
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Supply Chain
Cost, transit time, ordering, ease of use, and ample technical information. I was in the coatings business for 40 years and even a large Dutch company couldn't supply product this easy.
April 8, 2025
Great company!
It's so easy to order what we need and products arrive so quickly! Free shipping rocks too!
April 4, 2025
Update from previous review
Update from previous review. It was the Carrier's fault not RadonSeal. Packed well but still 1 tube burst at mixing point and pretty much destroyed rest of contents in box.
RadonSeal reached out and have resolved the issue. Great Follow up guys!!
Product works very well needed x-tra.
Thanks again!
April 4, 2025
Unprompted review
Received on time but the product leaked…
Received on time but the product had leaked all inside the box and so sticky I couldn't get the peanut styrofome unattached from product. Request refund or replacement! Send me lable to print to send back.
Please use other carrier other than FedEx -- i never have luck with them.
March 31, 2025
Reply from RadonSeal
Hi Greg. Sorry to hear about the damage. I have just sent you an email, please respond and include photos of what was received. We will file a damage claim on your behalf and send a replacement right away. - Cheryl@RadonSeal
Radon Seal Purchase
I have used Radon Seal previously and know the great quality of the product. Now that my concrete driveway is three years old it was easy choose the correct product based on the detailed information provided on the website. Once the product selection was confirmed ordering the product (and the correct quantity) was rather easy as quantity coverage data is provided.
March 31, 2025
I got my order placed online
I got my order placed online, it was received in the time span they said it would be to my residence. I can't ask for anything better than that.
March 13, 2025
I ordered on a Sunday afternoon
I ordered on a Sunday afternoon, and my kit arrived on Tuesday. Straightforward process all around.
March 24, 2025
I order three products from the…
I order three products from the company. All of them came with an SDS. The one product came with PPE to use when using the product. I also had to call and talk to one of the customer service representatives about an issue I had when using the one product. Everything has been great so far working with this company and the products that they sell
March 24, 2025
Slow shipment
It has now been 30 hours since I ordered product at it still has not been received by the carrier. Same day shipment has never happened on any of my orders
March 24, 2025
Reply from RadonSeal
Hello. Please accept our apologies for any delay. I do see that we shipped you order on March 24th, the same day the order was received, and that the product was delivered to you on March, 27th. If you did not receive your order, please let me know and we can open an investigation with UPS.
I called customer technical support
I called customer technical support. The representative was very helpful
March 17, 2025
DIY Crack repair kit is great!
I received the 20' DIY polyurethane foam kit quickly. When done I was pleased to see the foam actually filling all the way to the outside of the crack. A couple things I wish were different about the kit: please supply more mixing sticks and an additional spreader tool. What's supplied is enough for one 10' kit, but these tools need a refresh when you go beyond 10'. Otherwise very pleased with the result!
March 18, 2025
Unprompted review
Great Stuff
Great Stuff. I really enjoyed working with this product. My Driveway cracks have been repaired and looks great 👍 👌
February 24, 2025
Quality product
Fast shipping, easy to use. Just watch the videos on YouTube. This appears to be a quality product. I had a 6ft crack about 1/4" wide full thickness of 8". It took 3 tubes to fill the crack. Cleanup really is dusty. Use a respirator or a quality dust mask.
February 27, 2025
It was easy to order
It was easy to order. I was kept informed that my order went through and the bill came trrough quickly. The shipping was email to me so I would know when to expect the item.
March 14, 2025
call back after leaving a message was…
call back after leaving a message was relatively quick and speaking with a real person with solutions to my issue .
March 11, 2025
The items arrived very fast
The items arrived very fast, as described and the price is great! What more can you ask for?
March 4, 2025
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