Scott Paul ~ Restoring Concrete Since 1993

Update for 2026: Water Proof Concrete

In this revised piece, we provide a guide on Waterproofing Concrete. If you have come across any obstacles or have proposals for improvement or have any inquiries, feel free to leave a comment below.

How to Waterproof Exterior Concrete, Brick, and Masonry

When water is able to penetrate the concrete, it can cause all sorts of damage. Water and moisture absorption causes concrete to swell, which can lead to pitting, cracking, and heaving. In colder climates, freeze and thaw damage is a major concern. As the water gets into the concrete and freezes it expands causing major damage if neglected.

To prevent damage to the concrete, the surface should be waterproofed. Waterproofing concrete creates a water-repellent barrier to lock out moisture. This stops all water-related damage from occurring. In addition, waterproofing concrete will also prevent spills and stains from penetrating and potentially leaving permanent staining.

Waterproofing exterior wood rather than concrete? DeckStainHelp reviews the water sealers homeowners reach for most, including a detailed look at how Thompson’s WaterSeal actually performs over time.

To waterproof concrete, the surface should first be cleaned properly. Use a concrete cleaner and a high-pressure washer to remove all dirt, grime, mildew, and other contaminants. Spot treat and clean any oil or grease spots with a degreaser. Clean any irrigation rust with a rust remover. Once the concrete is clean allow it to dry for 1-2 days.

Choose a concrete sealer that best fits your needs. Some sealers penetrate into the concrete pores while others protect by forming a film on top of the surface. You may want to use a waterproof sealer that leaves a gloss or wet look appearance, or you may want something that does not alter the appearance of the concrete at all.

Once the concrete is dry and ready to be waterproofed, use a leaf blower or broom to remove any debris. Mask off any areas where you do not want sealer – like house siding, landscaping, etc. Use a roller or pump sprayer to apply the sealer. Try to work in small sections, applying just enough water and roof sealer to coat the surface. Do not overapply. Apply one to two coats, following the manufacturer’s recommendations.

Knowing how to waterproof concrete is a great way to save money by doing the project yourself. Most waterproof concrete sealers are user-friendly and easy to apply. Keep your concrete surfaces looking good and lasting a lifetime with a waterproof protectant.

Ask Questions in the Comment Area