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Epoxy Crack Filler for Concrete or Masonry

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This unique, state-of-the-art crack filler features the strength and tenacious bond of epoxy but is flexible, which allows for the natural movement of concrete.

The strength of this epoxy filler and its bond to concrete exceed the strength of the concrete itself. The filled joint can never be pulled apart because the concrete would crack first.

What sets it apart from ordinary epoxies is its flexibility (elongation). Concrete continuously moves in response to changes in temperature, settling, pressure from the soil or underground water, vibrations from traffic. If you fix a foundation crack with stiff epoxy and the structural stresses continue, a new crack will likely develop next to the old one. But this epoxy has a lot of “give” and will not lead to new cracks.

The Old Ways of Fixing Leaking Cracks

If you want to repair a leaking crack in concrete block wall or a floor-to-wall joint, the common methods provide only a temporary, superficial fix.

Hydraulic cement is waterproof but does not bond well to concrete. That’s why it needs an inverted V-groove. It is also very rigid and does not move with the concrete. After a couple of years, efflorescence (white powder) will start appearing around the repair, soon followed by trickles of water. 

Polyurethane caulk is both waterproof and flexible. It bonds well to the surface of dry concrete but wicking water and efflorescence gradually weaken the bond. It has no strength and easily separates due to water pressure, efflorescence, or traffic.

You could hire a contractor to use epoxy injection for cracks in poured concrete. But rigid epoxy is not suitable for expansion control joints in floors or for floor-to-wall joints of floating slabs because they are supposed to allow for movement to avoid structural damage.

Do-It-Yourself Epoxy Crack Filler Kit

State-of-the-art flexible epoxy for permanent repair of cracks, joints, holes, spalling, and defects in indoor or outdoor concrete and masonry. Permanently stops water leaks, resists chemicals and heavy traffic. Stronger than concrete but allows for its natural movement.

Two-part construction repair epoxy. No polymer additives, 100% thermosetting hydrophobic epoxy. Virtually indestructible under high water pressure, extreme temperatures, and heavy traffic.

The crack repair kit is suitable for contractors or for do-it-yourself application by homeowners.

Contents of the Kit:
1 qt. can of Base Resin (compound A)
1 qt. can of Epoxy Hardener (compound B)
2 measuring cups
1 mixer attachment.

You will need a plastic container (a small pail) for mixing and a low-speed electric drill for the mixer. If needed, some dry silica or play sand to be mixed in. A small trowel or a small plastic watering can if the epoxy will be poured into joints or routed crack.

Adding sand makes the mixture stiffer and suitable for application on walls with a trowel. The more sand (up to 5:1 or 6:1), the less sag after the application and more volume for filling the voids. However, adding sand decreases the flexibility of the cured epoxy (from about 30% for pure epoxy to almost none at 4:1 ratio).

Appearance: Adding sand results in a gray color, close to the color of concrete. Or sprinkle sand on the pure epoxy after application before it hardens.

The filler is paintable. In case of pure epoxy, it is best to first roughen up the surface with a grinder.

When is Crack Injection Better?

Crack injection with expandable polyurethane foam ensures that the entire depth of the crack is filled and keeps water out of the crack completely.

Cracks in Poured Concrete Walls
Use our D-I-Y Crack Injection Kits. It forcefully fills the full depth of the crack with expanding polyurethane polymer. Better than repairing just the surface of the crack.
Hairline Cracks in Concrete Floors
You can use our Easy-Peel Crack Injection Kits. This eliminates the need for routing out the crack and the forcefully expanding polyurethane fills the whole crack. But in case of cracks wider than hairline, it tends to run out from the bottom unless first partially filled with sand and it does not provide a hard surface for traffic.

Filling Large Openings in Concrete Floors

Examples: Filling a sump pit, a bathroom rough-in, concreting over a newly installed interior French drain.

You can use the concrete mix sold in stores but it is cheap and has little cement. This results in a very porous concrete, which allows water seepage and bonds poorly to existing concrete. Buy also a bag of Portland cement and add a couple of scoops to the concrete mix. Painting the old concrete with a bonderizer (latex-based primer) further helps in bonding with the new concrete.

Repair Projects for the Crack Filler

Use to repair cracks, joints, or pit marks in indoor or outdoor concrete and masonry.

The best repair method for:

  • cracks in concrete block or masonry walls (crack injection is not suitable)
  • expansion control joints concrete floors (use little or no sand for high flexibility)
  • floor-to-wall corner joints in basements (use little or no sand for high flexibility)
  • routed cracks in concrete floors
  • tie holes and penetrations in poured concrete walls (use lots of sand for troweling)
  • cracks and spalled or pitted concrete in driveways, patios, and pool decks
  • cracked and worn factory or warehouse floors
  • spalled or cracked parking decks and protecting embedded steel.

For information on the appropriate mixture and application for your project, visit Epoxy Crack Filler Application
For more info, visit How to Repair Cracks in Concrete Floors and Floor-to-Wall Joints

Price and Shipping


Item
Price
Shipping
Epoxy Crack Filler Kit (epoxy 2x 1-qt.)
$144
$15
Epoxy Crack Filler Kit - large (2x 1-gall.)
$289
$21

Normally shipped the same or next business day. Delivery by courier in 3 to 5 business days. Shipping costs are valid for the lower 48 states. For shipping express, other states or Canada, please contact us for shipping rates. Returns in salable condition are accepted within 30 days of purchase.

Coverage

Based on an expansion control joint or a routed out crack 1/4" wide by 1/2" deep and using pure epoxy (without added sand), the smaller kit (2 quarts of epoxy) will fill approximately 120 linear feet of cracks. The larger kit (2 gallons of epoxy) provides four times more volume – 480 ft.

At a 4:1 sand to epoxy ratio, you will need approximately 20 lbs. of dry silica or play sand and the smaller kit will fill about 600 ft. of cracks ¼” wide and ½” deep.     


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Products not sold through retail stores. Available exclusively from:
Radon Mitigation & Waterproofing Concrete Sealer Co.
Novion Inc., 18 L'Hermitage Drive, Shelton, CT 06484 USA
RadonSeal™ is a registered trademark. Copyright © 1998-2008. All rights reserved.

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