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Sealing Basements against Radon Gas

Customers’ Feedback and Tips

Problem: Radon, Wet Basement Products Used: RadonSeal Concrete Sealer

“Hi, I just wanted to send you a thank you note. I applied (4) coats of the RadonSeal Plus to the block walls and (2) coats to the floor of my very damp basement. In the past, the walls were always wet at the bottom and there was always a small amount of standing water at the base of the walls. After the application, I had a whitish powder which I was able to wipe away. Within days, I no longer had any standing water or wet walls. The radon test results came in today with great results. The level went from 5.1 pCi/L to 0.3 pCi/L. Thank You very much, your product was easy to use and seems to work like a charm. I will recommend your product and contact you with any future needs that I might have.” – Traci T., DE

Problem: Very High Radon Level, Dampness Products Used: RadonSeal Concrete Sealer

“Purchased a 6-year-old house with a radon level of 64 pCi, the prior owner will not reduce or correct. In Pennsylvania (South Central). The floor is poured slab, about 2,600 sq feet, walls are block, some signs of moisture, no actual drips. After RadonSeal, I saw a drop in Radon (using 72-hour electronic monitor) from 64 pCi to 2 pCi! Of course, I did seal all cracks with polyurethane made for expansion joints and cap the sump pump. …. Painted some of the wall – easier than I’m used to with block and greater spread (area wise). Have not tiled the floor yet, but I am beginning to think I might get away with not installing a subfloor and just lay tile right on the concrete. Thanks, RadonSeal!” – John D., M.D., PA

Problem: Radon, High Humidity, Seepage Products Used: RadonSeal Concrete Sealer

"I recently purchased two pails of RadonSeal to help lower my Radon level of 3.7 pCi/L recorded in my basement even though I live in an area of Tennessee where EPA feels Radon levels are low. The basement had high humidity levels with water seepage with standing water on some parts of the 1600 sq.ft. I applied three coats of RadonSeal and two days later recorded Radon levels of 1.0 pCi/L. My water seepage and standing water problems disappeared. Needless to say I am very pleased with RadonSeal and would recommended this product". Sincerely, – Rick D., TN

Problem: Radon, Humidity Products Used: RadonSeal Concrete Sealer

"Hello, We love your product – our basement has been dry for 2 years and just passed a radon test for the buyers of our home. (We didn’t bother mentioning that it had failed one, some years back.)" – Elisabeth L.J., NJ

Problem: Ineffective Fan Mitigation Products Used: RadonSeal Concrete Sealer

"Awesome Product!
Had multiple punches for pipes through basement floor to reduce radon levels, with only a one point drop each time. I sprayed the basement walls and got a two point drop for significantly less money. Thanks RadonSeal." – Norman, Trustpilot review

Problem: High Radon Level Products Used: RadonSeal Concrete Sealer

"We just checked radon this past week, and our basement now is reading 2.0, checked at 2 different locations. Not bad for starting at 29 pCi/L! The house has been closed up, …. I have the drains covered with plastic, but not sealed, and still have the low reading." – Andrean L., IL

p>Problem: Radon Products Used: RadonSeal Concrete Sealer

"I had previously tested at 4 pC (units?) of radon, the threshold for recommended remediation. After treatment, the measure was less than 1. I am pleased with the results! Regards." – Richard T., PA

Problem: Radon Products Used: RadonSeal Concrete Sealer

"great stuff! second time user. Lowered the radon level from 27 to .04 amazing!!" – David, Trustpilot review

Problem: High Radon Level, Cinder Blocks Products Used: RadonSeal Concrete Sealer

"Well I didn’t believe it at first, but your Radonseal worked like a charm! I have a concrete floor and cinder block walls in my basement. I used 3 pails of Radonseal, primarily because the cinder block is so porous …I dropped the radon reading from 18 to 0.7." – Bob G., NY

Problem: Radon, Ledge Products Used: RadonSeal Concrete Sealer

"what a great product!! my wife and i live in in a salt box house with a partial basement built on ledge. when we purchased our house this summer we had a radon test done. the results were discouraging as they came back at 3.6 pci/l, which is .4 under the suggested limit but its still cancer causing. after a lot of research, we bought your product, radonseal. although we were somewhat skeptical, we thought we’d give it a try as opposed to a costly radon mitigation system we would have to install on the verge of winter. we sprayed on Radonseal, bought another radon test kit and awaited the results. lo and behold, we dropped the level of radon to 0.1pci/l!!! thanks so much, we’ve already been recommending to others!!" – Scott S., NH

Problem: Radon, Selling House Products Used: RadonSeal Concrete Sealer

"We sold our house and before the closing bought a new one. Then came the bad news that our old house tested for radon at 5.6! … we found RadonSeal. I sprayed it on right away and asked the inspector to test again. To his surprise, the radon level was now only 1.8! It cost us only $360 and the sale closed at the original price." – Ray P., IA

Problem: Radon Products Used: RadonSeal Concrete Sealer

"Excellent product. Sealed my basement walls and floor with RadonSeal Plus. Radon level before – 6.9 / radon level 27 days after application – 3.7. More work to do, but couldn’t be happier. thanks." – Don, Trustpilot review

Problem: Radon, Carpeting Products Used: RadonSeal Concrete Sealer

"We applied 5 gallon of RadonSeal to a 26×32 basement floor prior to carpeting. The reading was twice the recommended safety level (8.2 pCi/L) prior to applying the seal. We applied the seal, installed an electronic permanent tester and the radon reading is now 0.2! We are happy with the results. Your office was very helpful. Thank you." – Paul S., VA

Problem: Radon Products Used: RadonSeal Concrete Sealer

"One year ago, we bought a ten year old house with an unfinished basement. We also bought a radon detector and checked the radon level in the house before closing. The radon level was at 3, an "acceptable" level. This summer, while organizing the basement, I ran across the radon detector again. I plugged it in and the alarm kept going off because the radon level had risen to 4. We immediately began researching radon mitigation methods on the internet and came across RadonSeal’s website. Their product sounded intriguing, so after several more hours of research, we purchased it. Like the company said, it was really easy to apply (once we figured out how to open the bucket). Seriously, the hardest part of the whole process was picking up all of the kids toys so we had a bare floor to spray the sealer on. We applied it a month ago and our radon level is already down to 1, even though we couldn’t do the entire basement because one end of it is currently being used for storage, and there’s a big pile of lumber on the other end. We are planning to finish applying the RadonSeal when we have access to all of the walls." – Brooke S., MI

Problem: Radon, Credit for Mitigation Products Used: RadonSeal Concrete Sealer

"We found a nice house, but before closing the home inspector measured radon at 9.5 pCi. We negotiated a $1,000 credit for radon mitigation. Then, we discovered RadonSeal … It was quick and easy. We have reduced radon from 9.5 down to 1.6 pCi! The 2 pails of RadonSeal cost us $400 and we have earned $600 for a couple of hours of work!" – Joe M., PA

Problem: High Radon Level Products Used: RadonSeal Concrete Sealer

"My father-in-law suggested that I should share my success with your product. My results were very similar to his. I covered the walls and floors of my basement with RadonSeal in two coats. We have gone from radon measurements around 18 pCi to a consistent long and short term reading of 2. I couldn’t be more pleased, and I feel that I got an excellent value compared with other options I have heard about from friends and neighbors." – Jonathan P., IL

Problem: Radon Products Used: RadonSeal Concrete Sealer

"I recently moved to my current address and the radon tests showed a 3.5 reading. I did some research and found RadonSeal. I have to say I was very skeptical of the effectiveness of RadonSeal. Since I dislike the idea of installing a fan-based mitigation system, I decided to give a RadonSeal a try given it has a money back policy. To my surprise, the two tests after applying RadonSeal came back both well below 2.0. I am very pleased to say the least! I highly recommend RadonSeal because it works!" – Ray P., MA

Problem: Radon Products Used: RadonSeal Concrete Sealer

"Sealing 24 year old basement:
Radon Seal is easy to use and it reduced our basement radon reading from 16 to 4. It also makes a nice finish on the concrete floor." – Bruce, Trustpilot review

Problem: Radon Products Used: RadonSeal Concrete Sealer

"I recently purchased your RadonSeal for my basement floors and walls. My radon has dropped from 8.4 to 3.1. I Just wanted to say "good product"! I am  a carpenter I will surely tell my friends how well it worked. THANKS." – L.H., NY

Problem: Radon, Water Vapor Products Used: RadonSeal Concrete Sealer

"Twelve years ago I sprayed Radon Seal on my basement walls and floor (new construction). After sealing the floor down I taped clear plastic to the floor in numerous places, and left it there for many months. Not a single drop of water vapor ever accumulated on the plastic, a testament to the effectiveness of your product. I have a radon tester running 24 hrs a day, so I can keep tabs on the levels in the basement office. By using Radon Seal, radon levels went from over 12 pCi/L when we bought the house, down to an average of 1.4 in summer and 1.8 pCi/L in the winter. For the Colorado Rocky Mountain areas, that is excellent!" – Christen R., CO

Problem: Radon Products Used: RadonSeal Concrete Sealer

"I wanted my husband to finish the basement but insisted on testing for radon first, because our son would sleep there. The test came out at 4.3 … I sprayed it on and my husband caulked one Saturday morning. We have just received our radon results yesterday. The radon has dropped to 1.4 and we have saved $800!" – Jaime V., CT

Problem: Radon, Basement Waterproofing Products Used: RadonSeal Concrete Sealer

"I purchased 2 five gallon pails of RadonSeal and applied them to my basement floor and walls. Prior to the application, the radon level was 7.1 (pCi/L). The following week I tested again (in two separate locations) and the level was reduced to 1.6 (pCi/L) even when the instructions indicated that the RadonSeal reaches its full strength in 30 – 60 days! Not only was the product effective at reducing the radon level, it was also very easy to apply and much less expensive than other radon mitigation methods. Plus, I am in the process of finishing the basement and now have the added assurance that the basement has been waterproofed! Although initially I was skeptical, based on my experience, I would recommend RadonSeal as an effective means to radon mitigation and waterproofing. Thanks RadonSeal!" – Robert L. H., CT

Problem: Radon Products Used: RadonSeal Concrete Sealer

"After getting a radon reading during my home inspection of 3.8 with spikes up to 5.9, I bought an electronic radon detector and ordered 4 pails of radon seal for the walls and floor. My radon detector registered 4.8 pCi/L before the application. After 2-3 coats of RadonSeal the reading had dropped to 1.8 where it has consistently remained for the past month. Thanks RadonSeal!" – Wayne, Raleigh, NC

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