How to Make Concrete Waterproof

Concrete Waterproofing
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Concrete is one of the highly durable and commonly used construction materials. However, concrete is also permeable by design, and even the top quality in the market has some level of porosity.

With this characteristic, you can already tell that water can be the huge enemy of your concrete surfaces. So if you want your concrete surfaces to stand the test of time, you'll need to waterproof them.

Read through this guide as we discuss how to waterproof concrete and other surfaces made using asphalt and bitumen materials.

Why is concrete waterproofing important?

Concrete reacts with chemicals and water. When exposed to water, it absorbs and retains moisture, resulting in discolorations over time due to corrosion. Moisture promotes molds and mildew growth that is detrimental to concrete.

Various chemical compounds like salt and other acids also react with cement, metal, and aggregate used to reinforce concrete, which weakens it.

For these reasons, concrete waterproofing is crucial if you want your concrete surfaces to last long.

How waterproof products like paints will help in waterproofing concrete surfaces.

There are various forms and ways to protect your concrete surfaces from elements like moisture, but before you embark on this journey, ensure you perform a simple inspection around the area. Check out for leaks, drips, cracks, or any other form of water clogging where they shouldn't be.

After identifying these areas, start by repairing, which involves filling and sealing in. For an additional layer of protection, use waterproof paints or products to cover over concrete surfaces and walls.

Waterproofing Concrete Surfaces in 3 Easy Steps

Before we jump into these straightforward steps of waterproofing concrete surfaces, let’s look at the things you’ll need for this task.

  • Push broom,
  • Water hose,
  • Mop,
  • Concrete cleaner,
  • Liquid concrete waterproofer,
  • Scrub brush,
  • Watering can,
  • Paintbrush,
  • Painter’s tray,
  • Long handle roller,
  • Trisodium phosphate, TSP,
  • Protective gear, such as boots, gloves, and goggles.

Step 1: Surface Preparation

Thoroughly sweep the concrete surface to remove dust and debris. Do this at least twice based on how dirty your surface is. You can rub the area with your fingers to see if there is some dust remaining on it.

After the area is clean, dry, and dustless, use the watering and start sprinkling the concrete cleaner on the surface. Let the cleaner soak for 15-20 minutes, then use the scrub brush to scrub the surface vigorously.

After this, use the water hose to rinse off the concrete cleaner. Give the surface some time to dry. A day or two is ideal before you apply the sealer.

Step 2: Seal The Concrete Surface

Different types of concrete sealers need different amounts per square foot. Read the sealer package for usage directions and add some into the painter's tray, then apply it to the area using a paintbrush.

Ensure you don't stain your walls if you are sealing the floor. While on this, you need to cover the areas you don't want the stains to reach with plastic sheets before you start the sealing process.

Use a paintbrush when sealing edges of the floor close to the walls, and use a roller to seal other areas. You can also do this with a paintbrush and paint sprayer if you don’t have a roller handy with you.

Apply the second coat for great results. This time run the roller in the opposite direction as the first coat to ensure the sealer spreads nicely into the surface. Allow it enough time to dry; one or two days can be enough.

Step 3: Post Concrete Waterproofing

Once you have sealed the concrete surface and allowed it to dry, care begins right away. Besides the two day drying time, you should allow it a further three days before touching or setting foot on it. For driveways, give it a minimum of two weeks before you start driving on it.

What's more, wait between 25 to 30 days before you begin cleaning the surface with your concrete floor cleaning detergent. Do not be quick to clean, as this might weaken the sealant used.

Depending on the amount of traffic and the type of sealants used, consider periodical resealing to prevent future cases of water seeping through the surface.


Waterproofing concrete is essential to protect structures from water damage and extend their lifespan. By following the techniques mentioned in this blog post, you can effectively waterproof your concrete surfaces.

Remember to choose the appropriate method based on your specific requirements and consult with professionals if needed.

With proper preparation, application, and maintenance, you can rest assured that your concrete surface will survive the test of time for the better.

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