RadonSeal™ Penetrating Concrete Sealer is a reactive, internal sealer for concrete, mortar, and other cementitious materials. It penetrates deep into concrete (up to 4 inches), reacts, expands inside the pores, and cures as a mineral. It is like injecting more cement into the concrete. Environment-friendly, non-hazardous sealer with no fumes or noxious odors.
The results are PERMANENT, no re-application is ever needed. Unlike common surface sealers or waterproofing paints, it will never peel or wear off. It cannot be pushed out regardless of hydrostatic pressure. The only concrete sealer backed up by a Limited Lifetime Money-Back Guarantee!
RadonSeal bonds, strengthens, preserves, and waterproofs concrete. It seals concrete
against water seepage, as well as water
vapor, and
even the minute atoms of radon gas. Use it on new and old concrete, vertical
and horizontal surfaces, indoors and outdoors. RadonSeal provides the solution for a multitude of problems caused
by the porosity of concrete:
Before finishing your basement, protect your investment and seal the concrete with RadonSeal! Otherwise, covering the walls and floor will trap water vapor seeping through the concrete and cause molds, mildew, and musty odors. Reduce radon to a minimum. RadonSeal preserves concrete and extends its life.
Before painting or coating concrete or installing flooring on concrete floors, seal the concrete with RadonSeal against moisture, efflorescence, and the "alkali attack."
Not sold in stores but shipped directly from the factory to your door. Orders received by 1 pm ET are normally shipped the same day and UPS Ground delivers within 2 to 5 working days in the lower 48 states.
Use RadonSeal Standard on newer poured concrete in good condition (indoor concrete less than 20 years old or outdoor concrete less than 2 years old). RadonSeal Plus has a higher mineral content to fill larger pores in concrete blocks, cinder blocks, and for older or very porous poured concrete
 |
Size | Price | Shipping | ||
|---|---|---|---|---|---|
| RadonSeal Standard | 5-gallon pail | $20 OFF (was $169) $149 |
$24 |  |
|
2.5-gallon half-filled pail |
$89 | $18 | |
||
| RadonSeal Plus |
5-gallon pail | $20 OFF (was $189) $169 |
$24 | |
|
2.5-gallon half-filled pail |
$99 | $18 | |
RadonSeal is shipped in 5-gallon pails and a typical basement needs 2 (or 3) pails. Also available in 2.5 gal. size (1/2 pails) or 55-gal. drums. Coverage is much larger than other sealers or paints:
| Typical coverage per 5-gal. pail |
Poured concrete | 1,000 sq. ft. |
| Concrete blocks | 500 sq. ft. | |
| Cinder blocks | 400 sq. ft. |
For secure and encrypted online processing of your order, click ORDER ONLINE. You can use your credit card, PayPal account, or Google Checkout. Or simply phone your order in! If you prefer mailing a money order or check, use the Order Form. Also sold at Amazon.com.
The shelf life of RadonSeal is one year. Unopened pails in salable condition are returnable. Check out Commercial Terms.
To apply RadonSeal, the surface must be bare (unpainted) – any paint or sealer, adhesives, oil, efflorescence, etc. has to be removed first.
Spray on RadonSeal with a low-pressure sprayer like a hand-pump garden sprayer. It is non-toxic, nonflammable, and non-hazardous. There are no chemical solvents, VOCs, or noxious fumes.
For more information, application instructions, and MSDS, check out:
Instructions
MSDS
PDS
RS Standard label
RS Plus label
RadonSeal brochure
For more detailed instructions and tips for sealing various cementitious materials, please read Tips on RadonSeal Application and Use.
...water was actually puddling in the middle of the room, coming up from under the concrete floor. I used the Radon seal and to my amazement ... no more water in fact no more moisture! That was 5 years ago.. .... Tom F., Atlanta, GA
My cinder block wall was seeping water, so I sealed it with Drylock. But after several months, efflorescence pushed it out ... painted it again two times, but it always peeled and leaked again. ... your RadonSeal ... pushed out rivers of efflorescence from the concrete and it is now bone-dry... Brian D., NC
... finishing my basement and had great concerns about damp basement air, mold and mildew, and of course radon. Particularly, since we have a newborn in the house. ... My radon is now very low and the basement feels dry. ... Mark W., MA
... a musty and damp basement and having two very allergic young children to mold and mildew. ... applied your Radon seal on the cinder block as directed and have not had any dampness in the basement anymore, ... Ken L., Edison, NJ
... relative humidity in the basement rooms would constantly hover between low 80% to high 70%. ... a definite “musty smell” ... Since applying the RadonSeal ... humidity is holding at 44 to 46% without the use of the dehumidifier! ... Jim M., GA
... The floor in my shop used to get wet from condensation every spring. It has worked GREAT! I have a dry floor year round ... Rick R., MN
... RadonSeal Plus to the block walls and (2) coats to the floor of my very damp basement. ... went from 5.1 pCi/L to 0.3 pCi/L. .. Traci T., DE
... After RadonSeal, I saw a drop in Radon (using 72 hour electronic monitor) from 64 pCi to 2 pCi ... John D., M.D., PA
See more Testimonials
RadonSeal is the heaviest available silicate-based sealer, which penetrates deeper, carries more active minerals, and seals tighter than any other concrete sealer. The penetration does not depend on gravity – it is also used on walls and ceilings. In case of basement walls, RadonSeal is usually applied on the interior to seal against water seepage, as well as water vapor and radon from the ground. But if there is an opportunity to apply it on the outside, it has the added advantage of preserving the exterior of the concrete and extending the life of waterproofing coating.
When concrete cures, it produces "free lime" as a by-product. RadonSeal chemically reacts with the free lime inside concrete and expands inside the capillaries. It forms a silicate mineral – the same mineral produced by the hydration of cement paste, which bonds, strengthens, and seals the concrete. Sealing with RadonSeal is like injecting portland cement into the pores in concrete. Simply, it results in a higher grade of concrete that is denser, stronger, and tighter.
The seal is permanent! No re-application is ever needed.
RadonSeal is a user- and environment-friendly waterborne sealer formulated for an easy and safe application. Non-hazardous, zero VOCs.
More information: For more info on how RadonSeal works, the “alkali attack” and efflorescence, how to protect concrete, paints, and flooring against deterioration, visit Sealing Concrete with RadonSeal
Unsure about your selection? Visit How to select the best sealer for your project
RadonSeal leaves no film or color on the surface, unless over-applied.
It waterproofs concrete internally but does not make the surface water-repellent. The surface does not bead water and does not become slippery when wet. It will absorb water drops (it “wets”) but a large puddle will stay, because the concrete is waterproof.
The surface remains suitable for paints or adhesives, thinset, patching, resurfacing, levelers, etc.
RadonSeal spray-on application makes it an easy do-it-yourself home repair or home improvement project.
RadonSeal reduces costs and warranty callbacks, improves results, adds value, and increases customer satisfaction for a variety of contractors:
| Building contractors | Concrete contractors | |
| Basement remodeling contractors | Waterproofing contractors | |
| Radon mitigation contractors | Mold remediation contractors | |
| Flooring contractors | Painting contractors |
Also available in 55-gallon drums. Volume discounts. Info for builders and contractors
RadonSeal prevents or solves problems with moisture, molds, and radon in residential, institutional or commercial buildings like schools, apartments, hospitals, and hotels. It preserves commercial and industrial concrete assets indoors and outdoors – warehouses, factory floors and walls, cooling towers, water treatment plants, and bridges. It also protects parking areas, garages, and factory floors against oil spills and most chemicals. Info on RadonSeal commercial applications
RadonSeal can be shipped in 24- or 36-pail shipping pallets and 55-gallon drums. Application contractors are available in some areas. E-mail us at commercial inquiries
The history of penetrating silicate concrete sealers dates back to Germany in World War II, when they were used to strengthen quickly poured thin military runways. After the war, the Army Corps of Engineers started using the sealers for the preservation of concrete dams and bridges. As the technology evolved, the use of silicate concrete sealers expanded from preserving structural concrete to waterproofing outdoor and indoor concrete. Somewhat diluted, they are also used as "surface hardeners."
During the last couple of decades, penetrating silicate concrete sealers have become widely used in the US and abroad, be it the Disney World or Sydney Opera House. Many architects specify them for major buildings. The sealers have been successfully used on thousands of major concrete structures and buildings.
MADE IN USA
Products not sold through retail stores. Available exclusively from:
Radon Mitigation & Concrete Waterproofing Co., Novion Inc.,
18 L'Hermitage Drive, Shelton, CT 06484 USA
RadonSeal™ is a registered trademark. Copyright © 1998-2012. All rights reserved.
