Your Source for Care and Repair of Basements, Concrete, and Bricks

RadonSeal Concrete, Brick, and Paver Sealers protect against water, freeze-thaw, and salts.

RadonSeal® has been providing architects, general contractors, waterproofing professionals, and DIY homeowners with knowledgeable advice and safe, eco-friendly waterproofing products such as industry-leading penetrating concrete sealers, state-of-the-art penetrating brick sealers, outdoor paver sealers, foundation crack repair kits, and other professional concrete and basement care products.

We have heard the horror stories and felt the frustration from thousands of homeowners who call looking for solutions about troublesome wet basements that (they swear!) will never dry out or, other "waterproofing" products that failed to live up to expectations. Proud, but now crossed homeowners, venting about concrete driveways that have prematurely cracked due to shoddy contractor work. Concerned homeowners wanting to alleviate radon levels in basements. Frustrated koi pond owners whose fish have died because of high alkalinity (pH). Decorative contractors or DIY homeowners looking for a safe alternative to acid stain or, a grandmother battling poor health because of mold and moisture issues in her home. Commercial or residential, indoor or outdoors, small or large, whichever the project may be, we normally have a solution for it and the experience to prepare you for success! Why have so many trusted in our products?

  • UNIQUE – Cutting-edge, high-strength, result-oriented products beyond anything available in stores.
  • COMMERCIAL-GRADE – Specced commercially for high vehicular and foot traffic areas.
  • ECO-FRIENDLY – Environment and user-friendly products that can be safely used indoors.
  • LONG-LASTING – Products designed to provide long-lasting and permanent results.
  • RESULTS – Trust is in the results. Over time, our reputation for delivering quality products and knowledgeable service is unsurpassed.
  • UNMATCHED WARRANTY – RadonSeal® Permanent Concrete Sealer is the only concrete sealer specifically developed to seal against radon gas and the only one backed up by a Money-Back Lifetime Warranty!
  • UNBIASED SERVICE – Always putting our clients' needs first! If you have questions regarding our products, methods of application, or your specific project, please contact us to communicate with our product technician. If we can't help, we will recommend someone that can.

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RadonSeal Basement and Outdoor Waterproofing Products

Our basement waterproofing materials (listed below) have been specifically formulated to provide superior strength with permanent results for your concrete, brick and masonry needs. Not only will the products exceed your expectations but the application methods involved will provide you with the lasting waterproofing solutions you demand!

Commonly used for commercial and residential projects, widely used by professional contractors, engineers, architects, flooring contractors, radon mitigation experts, and do-it-yourself homeowners. Used for sealing basement floors, basement walls, concrete block foundations, cinder blocks, retaining walls, garage floors, brick structures, historical renovations, crawl spaces, chimneys, porous tile, grout, patios, pool decks, koi ponds, etc.


RadonSeal basement sealer
RadonSeal® Deep-Penetrating Concrete Sealer

THE #1 CONCRETE SEALER – Waterproofs, mitigates, and strengthens concrete! Penetrates and permanently seals indoor or outdoor poured concrete and concrete blocks against water seepage, moisture vapor, efflorescence, and even radon gas! Stops hydrostatic pressure. Densifies, prevents spalling, cracking, dusting. Use for sealing basement walls, basement floors, slab-on-grade foundations, crawlspaces, garage floor, driveways, warehouse floors, parking areas. Slip-resistant. Paintable. Water-based. Zero VOCs. Money-Back Lifetime Guarantee!

LastiSeal Concrete stained floor
LastiSeal® Concrete Color Stain & Waterproofing Sealer

Concrete Stain and Penetrating Sealer in One! – Waterproofs and stains concrete in one step! Preserve and beautify your outdoor or indoor concrete, commercial or residential. Use on driveways, walkways, patios, floors, pool decks, basement floors, and pavers. Creates an attractive variegated look similar to acid stain. 37 Unique Colors. Waterborne – contains no acids! Easy application. Reduces efflorescence. Slip-resistant. Backed by a 15-Year Waterproofing Guarantee.

LastiSeal sealed brick wall
LastiSeal® Penetrating Brick & Concrete Sealer (clear)

Penetrating Brick, Concrete, and Paver Sealer – Commonly used for strengthening and waterproofing brick walls but can be used on a wide variety of porous materials, such as pavers, concrete, porous stones, stucco, plaster, grout, and porous tiles. Penetrates up to 4". Does not leave behind a slippery or shiny film on the surface. Repels surface water. Vapor-permeable. Use on chimneys, brick walls, fireplaces, split face blocks, pavers, colored concrete, retaining walls, or even outdoor wood! Water-based. Unrivaled 15-Year Waterproofing Guarantee!

sealed driveway with DryWay
DryWay® Water-Repellent Concrete Sealer

Protects Concrete Driveways, Sidewalks, and Pavers – Protects outdoor concrete and masonry against water, spills, freeze-thaw, road salts, and de-icing chemicals. Sheds water or beads. Lessens the bond of snow and ice. Spills wipe off easily. Does not change the friction of the surface. Water-based. No fumes or VOCs. Use for sealing driveways, patios, sidewalks, pool decks, garages, exterior block walls, and seawalls. Sheds water for up to 5 -10 years.

sealed factory floor with Ion-Bond Armor
Ion-Bond Armor™ Subsurface Elastomeric Sealer

The Industrial Concrete Sealer – Penetrates deep into concrete or masonry. Forms a subsurface waterproof barrier against surface water and negative-side hydrostatic water pressure, road salts, and chemicals. Permanent. Penetrates into tight surfaces and even through a layer of latex paint. Great for waterproofing fiber reinforced and colored concrete. When applied as a secondary sealer after RadonSeal, the combination provides the tightest internal seal against water vapor before installing flooring.

DO-IT-YOURSELF and PRO crack repair kits | foundation walls | concrete floors | control joints

crack in basement wall
RadonSeal® DIY Concrete Crack Repair Kits - for Cracks in Poured Concrete Walls

The Homeowner's Solution To Repairing Foundation Cracks – Permanently repairs cracks in poured concrete walls by filling them with expanding urethane or epoxy. Stops or prevents water seepage. Low-pressure injection eliminates the need for drilling. Fills the full thickness of the wall and any voids behind it, so that water will never find the crack again. For hairline cracks or cracks up to 1/2" wide. Complete crack repair kits – you just need a caulking gun.

repair crack in basement wall
RadonSeal® PRO Concrete Crack Injection Kits - Professional Toolkits for Contractors & DIYers

Contractor Repair Toolkits – Available in 30 FT and 60 FT sizes. For contractors or homeowners with multiple cracks in basement walls. Permanent crack repair. Fills cracks in poured concrete walls with expanding urethane or epoxy. Low-pressure injection eliminates the need for drilling and high-pressure machinery. Complete toolkits, including a dual-cartridge caulking gun.

sealed opening in concrete wall
PipeTite™ Repair Kits - for Pipes and Wall Penetrations

Waterproof Leaky Wire-Ties, Waterlines, Pipes, and Penetrations – Permanently repairs leaking penetrations through poured concrete walls around pipes or conduits, as well as leaking form wire ties. Similar to crack injection with expanding urethane. Expands through the thickness of the wall and tenaciously adheres to concrete and plastic or metal pipes. Unlike mortar or hydraulic cement, will not get loose and start leaking water.

repair cracks in concrete floor
CrackWeld® Concrete Floor Crack Repair Kits

Floor Crack Repair Made Quick and Easy – Quick and easy repair of cracks in concrete slabs, driveways, patios, pool decks, and factory floors. No routing needed! Fast-curing. Rigid repair, stronger than concrete. Will stop the crack from moving, growing wider or longer. A definite must before re-surfacing concrete driveways to avoid the propagation of cracks through the new surface.

expansion control joint in concrete floor
ElastiPoxy® Control Joint & Crack Filler Kits

Flexible Repair for Control and Floor-To-Wall Joints – Use on saw-cut contraction control joints in concrete slabs or leaky floor-to-wall joints in basements. Protects joints against heavy traffic in factories. When mixed with sand, provides a rigid and permanent repair of cracked or leaking concrete blocks, spalled concrete floors or driveways, and large cracks or holes in concrete. Stronger than mortar or hydraulic cement and adheres tenaciously to concrete.


water-powered backup sump pump
Hi & Dry™ Water-Powered Backup Sump Pumps

Ingenious Design – Why worry about sump pump failures, power outages, or batteries! These water powered pumps work by relying on the pressure of municipal water. The worry-free protection to your basement. Fully automatic – turns on when only needed. Mounted high and dry above the sump pit for superior reliability and service life. No rotating parts. Ideal for small or busy sump pits. Kits ship complete, including alarm, for do-it-yourself installation.

battery backup sump pumps
Hi & Dry™ Battery-Powered Backup Sump Pumps

When Performance Matters – Protects your basement against power outages and sump pump failures. Prevents basement flooding. Fully automatic. Uniquely placed out of the sump water for superior reliability and service life. Outperforms cheap store-sold back-up sump pumps. Ideal for small or busy sump pits. A complete pump kit, including an alarm. Very easy do-it-yourself installation.


Efflorescence Cleaner
RadonSeal® Efflorescence Cleaner

Safe Alternative to Acids – Avoid the use of hazardous acids by simply spraying on our RadonSeal® Efflorescence remover and watch the efflorescence disappear! For cleaning outdoor or indoor concrete walls and floors, concrete blocks, and brick walls. Ideal for basements and exterior building walls. (Ensure that the efflorescence does not come back by deep-sealing the concrete or brick with RadonSeal or LastiSeal.)

PowerEtch Concrete Etcher and Cleaner
PowerEtch™ Concrete Etcher & Cleaner

Give Your Concrete the "Tooth" it Needs – Industrial-strength concrete etcher and cleaner that is both user and concrete friendly. PowerEtch is powerful but non-corrosive to the skin and will not burn concrete. Low odor makes it ideal for indoor use. Use it to open up pores in hard-troweled concrete floors, to reduce pH, and clean concrete before applying penetrating sealers, water-based stains, paints, overlays, and coatings.

EasyEtch concrete etcher
EasyEtch™ Concrete Etcher & Alkalinity Reducer

Concrete Etching Made Safe – An organic and biodegradable solution that prepares concrete surfaces for sealing, painting, or staining without the hazards of harsh acids. Etches tight surfaces, removes stains, and reduces the pH of new concrete.

concrete paint stripper and cleaners
Cleaners for Concrete, Bricks, and Masonry

Lightning Strip Paint & Mastic Remover – Removes paints, adhesives, or mastic. Professional paint stripper.
Novion Universal Concrete Cleaner - Heavy-duty degreaser, removes oil stains, grease, and grime from concrete. Organic, bio-degradable.


BioZap Air & Mold Cleaner
BioZap All-Natural Air Purifier & Deodorizer

Purifies Musty Basement Odors – The genuine Australian Tea Tree Oil air cleaner. Avoid unhealthy ozone or synthetic scents that just mask odors! BioZap™ thoroughly cleans and deodorizes indoor air by slowly releasing organic vapors that break down odors in the air and on surfaces, textiles, and furnishings. Hypoallergenic and long-lasting. Use around the home and in basements, bathrooms, boats, duct systems, gyms, locker rooms, and offices.

BioZap Mold & Mildew Cleaner
BioZap All-Natural Mold & Mildew Cleaner

Beats Using Chlorine – Avoid unhealthy chlorine or harsh chemicals. BioZap™ Mold & Mildew Cleaner removes mildew and organic stains from surfaces and textiles. Unlike bleach, BioZap penetrates into pores and provides long-lasting protection. Breaks down odors and is color-fast. Just spray it on the contaminated concrete, carpets, masonry, wood, carpets, beds, and upholstery.

BioZap Laundry Pre-Soak
BioZap All-Natural Laundry Pre-Soak

Remove Musty Smells From Clothing – BioZap™ Laundry Pre-Soak uses the Australian Tea Tree Oil to remove stubborn body or smoke odors and mildew stains from laundry, which even modern detergents cannot handle. Great for towels, athletic gear, sneakers, underwear, smoke-damaged clothing.


vapor transmission test kits
Calcium Chloride Moisture Test Kits for Concrete Floors

Moisture Vapor Test Kits – Make sure to test moisture vapor transmission and pH of the concrete slab before installing moisture-sensitive flooring on concrete floors or coating floors with epoxy. If needed, seal the concrete with RadonSeal penetrating concrete sealer. For even a tighter seal, follow up with Ion-Bond Armor concrete sealer.

radon test kits
Short-Term and Long-Term Radon Test Kits for Air or Water

Test Your Home For Radon Levels – Healthy home, healthy family! US EPA recommends testing for radon in indoor air every year or two. Choose between short-term radon in air test kits or long-term test kits for more reliable results. Radon-in-water test kits. Beats store prices – two-way shipping, testing, and official reports by email and mail included in our prices.

Solutions for Basement Moisture Problems

Did you know that most basements start leaking water within 10 to 15 years?

The telltale signs of basement moisture are efflorescence ("white powder") and musty odors. Finishing the basement traps water vapor seeping through the concrete, which causes molds and musty odors in many basements. Rising basement air then spreads molds and radon gas through the house.

You are not alone! Did you know:

  • OVER 60% OF HOMES have a wet or damp basement.
  • 1 IN 3 HOMES have mold and mildew growth
  • 1 IN 6 HOMES have elevated levels of radon gas
  • 2% OF HOMES have the toxic "black mold"

Be Proactive! Protect your basement remodeling investment by first sealing the walls and floor against water and vapor, molds, and radon.

How To Waste $1,000s on Basement Waterproofing

When trying to repair a wet basement or alleviate a damp one, you might get stuck in an endless cycle of waterproofing “fixes” that consume more time and more money.

Does Money Buy Basement Happiness?

You could hire a contractor to excavate, apply exterior waterproofing coating, and repair footing drains but that may cost you $15,000. And it will do little for water vapor oozing in through the basement floor. If you later install flooring, it will only trap moisture and promote the growth of molds and mildew. Floor tiles will “pop.” Similarly, a “de-watering channel system” that takes water seeping through the walls to a sump pump does nothing to stop moisture coming in through the floor.

So, you may decide on a sub-slab interior perimeter drain system with a sump pump (around $6,000) but it does little for moisture infiltrating through the walls. Humidity will remain high. You might buy a popular “waterproofing paint" sold in stores but as a latex-based paint, it is naturally porous and will let in water vapor. Soon enough, it will peel due to efflorescence and water pressure. And it cannot be used on floors.

Often, homeowners install a couple of dehumidifiers, costing around $90 a month to run. But dehumidifiers pull in more moisture through the concrete, making it more porous. Meanwhile, water increases concrete porosity, which will let in more vapor and radon gas. You might end up with a fan-based radon mitigation system (around $1,200).

Instead of all that, you can save time and money by protecting your investment and your family's health by simply sealing your basement floor and foundation walls with RadonSeal. RadonSeal Penetrating Concrete Sealer chemically reacts and permanently cures inside concrete (cement) both strengthening and sealing your basement against water vapor transmission, water seepage, radon, and soil gases.

There is No Safe Radon Level

As the US Environmental Protection Agency explains, there is no safe level of radon, a radioactive gas which causes lung cancer, the No. 1 cancer killer. Radon causes more deaths than fires, drownings, and airplane crashes combined.

EPA RADON GUIDELINES FOR HOMEOWNERS 2 pCi/L EPA's “Consider Action" Limit ("consider fixing your home") 4 pCi/L EPA's “Action Level” ("fix your home")

People assume that the Action Level is like the safety limits on other carcinogens but the cancer risk from radon at 4 pCi/L is a hundred times higher. The mortality risk is three times higher than the risk of dying in a car crash or the equivalent to smoking 8 - 10 cigarettes a day (US EPA). Among women, it increases the lung cancer risk by 50%.

The vast majority of radon-induced lung cancers occur in homes with radon concentrations below the 4 pCi/L Action Level. Children are particularly susceptible.

How Radon Gets Into Homes

Reduce Your Home's Radon Level to a Minimum – Cancer risk is proportional to the radon level. Reducing radon from your current level by 50% lowers the cancer risk to each member of your family by 50%. Sealing your basement walls and basement floor with RadonSeal and making sure to repair/seal foundation cracks, floor cracks, gaps, and any easy pathways for radon to escape through can go a long way in reducing radon levels.

Get a FREE Short-Term Radon Test Kit: To test your house for radon you can order our short or long-term Radon Test Kits (cheaper than sold in stores). If you purchase a 5-gallon pail of RadonSeal at the same time (or within two months), the test kit is on us – we’ll give you a $15 rebate!

Concrete Waterproofing and Radon Mitigation in One Concrete Sealer

The Permanent Concrete Sealing Solution – Concrete paints, waterproofing sealers or cementitious coatings are a temporary fix only. They crack or peel and cannot stop gases or water vapor. Why not tackle the root cause of the problem? Seal those pesky pores inside concrete with RadonSeal and combine waterproofing, damp-proofing, mold remediation, and radon mitigation in one!

RadonSeal is Your Damp Proofing Solution!

Backed by a Lifetime Warranty – RadonSeal offers much more for your concrete than do common surface sealants that can be found in major hardware stores. RadonSeal is a permanent concrete sealer so you will never need to apply the product again! This water-based, clear, penetrating sealer will not leave a film or color on your concrete. RadonSeal works by sealing porous cementitious materials – indoor and outdoor, new and old; concrete, concrete blocks, cinder blocks, mortar, and stucco. Backed by a Limited Lifetime Warranty.

RadonSeal® Penetrating Concrete Sealer is deep-penetrating reactive concrete sealer that penetrates deep into concrete (up to 4"), reacts with lime and alkalis, forcefully expands inside capillaries, and hardens as an insoluble silicate mineral. (Silicates are the "binders" in concrete.)

The many benefits of sealing your concrete with RadonSeal® Penetrating Concrete Sealer:

  • Seals concrete against water seepage, water vapor.
  • Reduces indoor humidity preventing the growth of molds and mildew, alleviates basement odors.
  • Helps prevent the growth of molds, mildew, and musty odors.
  • Strengthens concrete reducing concrete dusting, spalling, and cracking.
  • Seals against efflorescence.
  • Neutralizes alkalis, protects paints, thinset, epoxy coatings, etc. Acts as a concrete primer.

Safe, Spray or Roll-On Application – Apply RadonSeal to your basement concrete using an airless sprayer, hand-pump "garden" sprayer, roller, or brush. RadonSeal is a waterborne concrete sealer – ZERO VOCs, no noxious fumes, non-toxic, nonflammable, and non-hazardous. The sealer absorbs inside the concrete leaving the surface slip resistant and paintable (does not change the appearance or profile of the concrete).