April 20, 2024

What is the best way to repair concrete leaks?

4 min read

We all know that concrete wall is prone to cracking, so we do everything we can to avoid it. But, as we all know, not everything goes according to plan. Concrete may fracture for a variety of causes, like water leaking and preventing them all can be challenging.

According to the Concrete Repair Bulletin, there are at least a few factors that enhance the chance of concrete cracks repair. Steel corrosion, freezing and thawing, a sulphate assault, and an alkali-aggregate reaction are all possibilities.

However, no matter how a concrete fracture seems, it may appear considerably worse if it begins to leak.

Don’t worry if all of this leaves you feeling a little unprepared. We’re here to offer you a quick summary of the most effective methods for repairing most concrete leaks (and the fractures that cause them!)

* Because it is both sturdy and cheap, concrete is one of our most durable man-made building materials for the basement walls. Cement and water are mixed to make concrete, which is then cured to solidify. Concrete, on the other hand, shrinks as it hardens in your foundation walls.

* Both excessively low and extremely high temperatures cause cracking, as can drying too rapidly or unevenly. If the soil beneath the foundation is not solid enough to sustain the structure’s weight, the settlement will result in cracks.

Prepare the Leaking Concrete Crack First

If you want to remedy a leaky concrete fracture, make sure you prepare it beforehand. It’s the only method to ensure that the crack is totally watertight once it’s fixed.

  • To do so, simply follow these simple steps:
  • Take out your electric chipping hammer and chisel through the gap to produce a deep, narrow chase.
  • Get ready to fill in the chase you just formed.
  • After that, do everything you can to avoid using an injection product.
  • You could be tempted to use an injectable product to fill up the gap, but resist.

While the procedure you’ve just begun sounds a lot like what you’d perform with an injectable product, it’s not quite the same. If you were intending to utilise an injection product, instead of chiselling out a chase, you’d usually drill holes along the crack’s length. After that, a port would be put into each of the holes to allow the product to be pumped in.

You won’t get the same impact if you only have a chiselled chase to pour stuff into. Not to mention the fact that some injections won’t be able to withstand constant movement in the concrete. Urethane foam injections, for example, are usually flexible and can sustain some movement. However, when some time has gone, this elasticity will diminish.

Also, don’t get an Epoxy Injection.

If you decide to take the injection route again, avoid using an epoxy injection at all costs. True, this sort of injection is intended to reinforce and restore the concrete crack’s integrity. However, it can only do so if the fracture is completely dry.


Unfortunately, water has no effect on an epoxy injection and cant prevent water. As a result, it can’t stop water from seeping out or modify the flow of the water in any way. In fact, if epoxy is poured into a fracture that is leaking, channels may form. Water will very certainly find a way back through the epoxy once this happens.

Cleaning the Floor Before applying any concrete filler, ensure sure the floor is free of grease or debris. If there is, apply a grease-cutting cleanser. This will make it easier for the filler to adhere to the cement.

Remove any big fragments in the fracture using a cold chisel and a hammer. To chisel out the fracture, hold the chisel at an angle and pound with the hammer. This is known as “keying” the hole, and it entails making the crack’s base or interior larger than it is on the surface. Keying aids the bonding of the new patching material to the existing fracture.

Vacuum and brush It’s critical to clean up and remove dust and debris after you’ve keyed the crack. Vacuum the crack completely with a whisk brush.


To use the concrete filler, remove the nozzle from the container and fill the cracks gradually. If you’re using a pre-mixed concrete repair, follow the manufacturer’s instructions for mixing and troweling the patch into the crack (image 2). In a few minutes, check the cracks to see if the filler has settled. If it doesn’t seem tight enough, you may need to add some more. Smooth up the cracks using a trowel.

Allow the filler to cure for at least 24 hours, or as long as the manufacturer recommends. Then double-check to see if any more patches are required.

Apply a sealant to the patch and the concrete

It’s a good idea to seal the concrete once you’ve patched it. Concrete is prone to staining, which may be avoided by sealing it. There are a variety of concrete sealing solutions available, but heavy-duty water-based polyurethane is an excellent option. If the floor has a rough finish, use a broom or brush to apply the polyurethane and work the bristles into the rough surface. Use a roller on a smooth surface.

Water-based polyurethane has the advantage of drying rapidly, allowing you to apply a second coat just a few hours after the first. Water-based polyurethanes also have a less offensive odour than other forms of sealers. It’s a good idea to apply three or four coats in high-traffic areas and preventing future water leaks.

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