How to Apply Cementitious Waterproofing to Your Basement

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Waterproofing your basement is crucial to protect your home from water damage and moisture-related issues. One effective method for basement waterproofing is applying cementitious waterproofing. In this guide, we will walk you through the steps to successfully apply cementitious waterproofing to your basement, ensuring a dry and protected space.

Assessing the Basement:

Before starting the waterproofing process, it’s essential to assess the condition of your basement. Look for signs of water intrusion, such as dampness, stains, or cracks. Identify any areas that require repair or additional attention before proceeding with the application of cementitious waterproofing.

Surface Preparation:

Proper surface preparation is key to ensure the effective adhesion of the Concrete Protective Coating material. Follow these steps:

a. Cleaning:

Thoroughly clean the basement walls and floors to remove dirt, dust, and any loose debris. Use a stiff brush, vacuum, or pressure washer, if necessary, to achieve a clean surface.

b. Repairing Cracks:

Address any cracks or gaps in the basement walls or floors using an appropriate crack repair compound or hydraulic cement. Fill in the cracks and ensure they are properly sealed before proceeding.

c. Etching:

Etching the surface with an acid-based solution or mechanical scarification can improve the adhesion of the cementitious waterproofing material. Follow the manufacturer’s instructions for the appropriate etching method and safety precautions.

Mixing the Cementitious Waterproofing Material:

Follow these guidelines for mixing the cementitious waterproofing material:

a. Read Instructions:

Carefully read the manufacturer’s instructions on the packaging of the cementitious waterproofing product. Different products may have specific mixing ratios and requirements.

b. Safety Precautions:

Wear appropriate protective gear, such as gloves and a dust mask, when handling the waterproofing material. Avoid contact with eyes or skin.

c. Mixing Tools:

Use a clean bucket and a drill with a mixing paddle to mix the waterproofing material. Gradually add the powder to the water while stirring continuously to achieve a smooth and lump-free consistency.

Applying the Cementitious Waterproofing:

Follow these steps to apply the cementitious waterproofing material:

a. Primer Application:

Depending on the product you are using, applying a primer may be necessary. Follow the manufacturer’s instructions for the specific primer and its application method, if required.

b. First Coat Application:

Using a brush or a roller, apply the first coat of cementitious waterproofing material to the basement walls and floors. Work in small sections to make certain even coverage. Pay special attention to corners, seams, and any vulnerable areas prone to water penetration.

c. Reinforcement Fabric:

If recommended by the manufacturer, embed a reinforcement fabric into the first coat while it is still wet. This fabric helps increase the strength and durability of the waterproofing system.

d. Second Coat Application:

After the first coat has dried sufficiently, apply the second coat of the cementitious waterproofing material. Follow the manufacturer’s instructions regarding the recommended drying time between coats.

Curing and Drying Time:

Allow the cementitious waterproofing material to cure and dry according to the manufacturer’s instructions. This process typically takes several days, so ensure proper ventilation and avoid any water exposure during this period.

Additional Waterproofing Measures:

To enhance the effectiveness of the cementitious waterproofing, consider implementing additional measures:

a. Proper Drainage:

Ensure that the basement has adequate drainage systems, such as a sump pump or French drains, to redirect any water away from the foundation.

b. Exterior Waterproofing:

Consider applying an exterior waterproofing membrane or coating to the outside of the basement walls to provide an additional layer of protection against water intrusion.

c. Regular Maintenance:

Inspect the basement regularly for any signs of water leaks or damage. Address any issues promptly to prevent further water damage and ensure the longevity of the waterproofing system.

Finishing Options:

Once the cementitious waterproofing has fully cured, you can proceed with finishing options for your basement. This may include painting the walls, installing flooring, or adding insulation. Ensure that these finishing materials are compatible with the waterproofing system and do not compromise its effectiveness.

Seek Professional Help if Needed:

While applying cementitious waterproofing to your basement can be a DIY project, it may be beneficial to seek professional help, especially if you have limited experience or if the basement has complex structural issues. Professional waterproofing contractors can provide expertise, ensure proper application, and address any specific challenges your basement may present.


Applying cementitious waterproofing to your basement is a crucial step in protecting your home from water damage and maintaining a dry and healthy living space. By assessing the condition of your basement, properly preparing the surface, mixing and applying the waterproofing material, and implementing additional measures, you can create an effective barrier against water intrusion. Remember to follow the manufacturer’s instructions, prioritize safety precautions, and consider seeking professional assistance if needed. With a well-executed cementitious waterproofing application, you can enjoy a secure and moisture-free basement for years to come.

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