Choose the Best Waterproofing Sealer for Your Surface
DIY Basement Wall Crack Repair Kits How to Fix a Wet Basement

Your Source for Care and Repair of Concrete, Brick, Pavers, and Masonry

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.


Leading Basement Waterproofing and Radon Mitigation Products Since 1997

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! Use 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.

Penetrating Sealers

for Concrete, Brick, Pavers, Porous Masonry

radonseal deep penetrating concrete sealer

RadonSeal Concrete Sealer

THE #1 CONCRETE SEALER for waterproofing, damp proofing, radon mitigation, and strengthening concrete. Commonly used for sealing poured concrete basement walls and floors, concrete blocks, garage slabs, and outdoor concrete.

LastiSeal Concrete Stain and Concrete Sealer

LastiSeal Concrete Stain & Sealer

Concrete Stain & Sealer in One! – Waterproofs and color stains concrete in one step. Add color and protection to concrete sidewalks, driveways, paver patios, garage slabs, concrete slabs, and more.... Read More

LastiSeal Brick Sealer and Concrete Sealer

LastiSeal Brick & Concrete Sealer

Waterproofs and strengthens indoor/outdoor brick, concrete, pavers, masonry, and porous stone. Commonly used for sealing chimneys, paver patios, garage slabs, driveways, fireplaces, and pool decks. ...Read More

radon seal deep penetrating concrete sealer

DryWay Water-Repellent Concrete Sealer

Keep it Clean! – Water-repellent concrete sealer that repels surface water and spill on outdoor concrete surfaces. Improve maintenance of the surface. Protects against freeze-thaw, road salts, and de-icing chemicals. ... Read More

Ion-Bond Armor Elastomeric Concrete Sealer

Ion-Bond Armor

Industrial Concrete Sealer – Use for tighter surfaces. Forms a subsurface waterproofing barrier against both surface water and negative-side pressure. Use on fiber-reinforced concrete, industrial floors, and thin concrete slabs. Often used in combination with RadonSeal for the tightest seal against water vapor and radon. ... Read More


for Foundation Walls, Slab Cracks, Control Joints

RadonSeal DIY Foundation Crack Repair Kits - Basement Walls

DIY Foundation Crack Repair Kits

The Homeowners Solution for Repairing Foundation Cracks - Low-pressure injectable urethane and epoxy kits to stop water leaks from settling cracks from foundation cracks in poured concrete walls. Use for waterproofing hairline crack or cracks up to 1/2" wide. ... Read More

RadonSeal PRO Foundation Crack Repair Kits - Basement Walls

PRO Foundation Crack Repair Kits

Toolkits for Waterproofing Contractors - Urethane and epoxy kits made available in 30-ft and 60-ft sizes. For contractors and homeowners with multiple cracks in basement foundation walls. Kits ship complete, including a dual-cartridge caulking gun plus carrying case. ... Read More

PipeTite Gap Filler Kit for Pipe Protrusions and Waterlines

PipeTite Gap Filler Kit

Waterproofs Leaky Wire-Ties, Pipe Protrusions, and Waterlines - Seals water leaks from gaps around pipes, conduits, sewer pipes, and wire-ties. Injectable expanding urethane completely fills voids through the thickness of walls. Adheres tenaciously to concrete and metal. ...Read More

CrackWeld Concrete Floor Crack Repair Kit

CrackWeld – Floor Crack Repair Kits

Concrete Floor Crack Repair Made Easy - Self-leveling, quick-curing compound for filling and waterproofing hairline cracks in concrete slabs, driveways, basements floors, garage floor, and pool decks. Eliminates the need to route or chase cracks!... Read More

ElastiPoxy Control Joint and Concrete Crack Filler Kit

ElastiPoxy Joint & Crack Filler Kits

Long-lasting Repair for Control Joints, Cracks, and Defects in Concrete - Self-leveling, flexible, hybrid-epoxy for filling control joints, saw cuts, or leaky floor-to-wall joints in basements. Mix with sand to provide a rigid repair for mortar joints, concrete block cracks, spalled concrete, and holes. ... Read More


High and Dry Water-Powered Backup Sump Pumps

Hi & Dry Water-Powered Backup Sump Pumps

Ingeniously Designed - Eliminates the worry about sump pump failures due to power outages or batteries! Suction relies upon municipal water pressure to empty the basin. Fully automatic - turns on only when needed. Ideal for small sump pits. Mounted high above the pit for superior reliability and performance. ... Read More

High and Dry Battery-Powered Backup Sump Pumps

Hi & Dry Battery-Powered Backup Sump Pumps

When Performance Matters - Protects against basement flooding due to power outages and main pump failures. Uniquely placed outside the sump pit providing superior service life. Outperforms cheap store-sold backup sump pumps. Easy DIY installation. ... Read More



RadonSeal Effloresence Cleaner

RadonSeal Efflorescence Cleaner


A Safer and Stronger Efflorescence Cleaner - Formulated strong to effectively remove stubborn efflorescence and mineral deposits from basement walls, concrete slabs, mortar joints, and garage slabs. Water-soluble. Non-corrosive to skin. Safe for indoor use. ... Read More

PowerEtch Concrete Etcher and Concrete Cleaner

PowerEtch Concrete Etcher & Cleaner

Give the Concrete the "Tooth" it Needs - Industrial-strength concrete etcher and cleaner that is both user and concrete friendly. Formulated strong to properly etch hard-troweled concrete surfaces, reduce pH, and clean concrete before applying penetrating sealers, concrete paints, water-based stains, and overlays.... Read More

EasyEtch Concrete Etcher and Alkalinity Reducer

EasyEtch Concrete Etcher & Alkalinity Reducer

Concrete Etching Made Safe - Organic and biodegradable concrete etching solution that prepares concrete surfaces for sealing, painting, and staining without the hazards of harsh acids. ...Read More

radon seal deep penetrating concrete sealer

Novion Universal Concrete Cleaner

Eco-Friendly, All-Purpose Concrete Cleaner - High-performance concentrated cleaner for cleaning grime, oil spots, and latex paint from concrete, brick, and masonry surfaces. 100% biodegradable, non-toxic, non-carcinogenic make it safe for indoor and outdoor use. ...Read More

Lightning Strip Paint Stripper

Lightning Strip Paint Stripper

Professional-Grade Paint Stripper - Guaranteed to remove all types of paint from concrete, brick, masonry, and wood surfaces. Also removes stubborn adhesive! Waterborne, non-aerosol, no caustics, lyes, or acids. Use on horizontal and vertical surfaces....Read More


BioZap Air Purifier and Deodorizer

BioZap Air Purifier & Deodorizer

All-Natural Purifier for Musty Indoor and Basement Odors - Avoids using unhealthy ozone or synthetic scents that just mask odors. Formulated to slowly release organic vapors of the tea-tree oil that break down odors in the air naturally! Use in basements, locker rooms, boats, and duct systems.... Read More

BioZap Mold and Mildew Cleaner - Naturally Cleans Visible Mold

BioZap 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 ... Read More

BioZap Laundry Pre-Soak - Cleans Most Laundry Smells

BioZap Laundry Pre-Soak

Removes Musty Smells from Laundry - All-natural laundry cleaner to remove the musty body, smoke, and stubborn odors from clothing and linens. Color-Safe. Use for towels, athletic and hockey gear, smoke-damaged clothing, and stored clothing....Read More



Radon Gas Test Kits

Radon Gas Test Kits

Short-Term and Long-Term Kits for Measuring Radon Levels - US EPA recommends testing for radon in indoor air and water every 1-2 years. Choose between short-term kits or long-term radon kits for more reliable results. Radon-in-Water test kits are also available. Beats store prices! No hidden lab testing or shipping fees.

Calcium Chloride Moisture Test Kits

Calcium Chloride Moisture Test Kits

Moisture Test Kits for Concrete Slabs - Test moisture vapor transmission and pH of concrete slabs before installing moisture-sensitive flooring, paints, stains, and surface levelers.

You Are Not Alone! Did You Know?

how to Make Your Wet Basement Dry

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.

Read More
There Is No Safe Radon Level

There is No Safe Radon Level

As the US EPA 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.

Read More

Concrete Waterproofing and Radon Mitigation in One 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.

Safe Spray-On 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, non-flammable, 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).

RadonSeal® Penetrating Concrete Sealer is a 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 by opening the surface pores.