Exterior Waterproofing Solutions for Masonry Walls

As a Homeowner, it’s crucial to keep your house protected from water damage. Water damage can cause serious structural problems, leading to expensive Repairs. Among the many areas of your house that need special attention are the masonry walls. These walls can be exposed to water ingress, which can weaken their integrity. In this article, we’ll delve into exterior waterproofing solutions designed to protect masonry walls from water damage.

What is Exterior Waterproofing?

Exterior waterproofing is a process of preventing water ingress through the exterior walls and foundations of a building. The waterproofing solution is applied outside the building, creating a barrier that prevents water from penetrating the walls or foundation. It’s a preventive measure, ensuring that water doesn’t cause any structural damage to the building.

Why is Waterproofing Essential for Masonry Walls?

Masonry walls are made of bricks, stone or concrete blocks that are held together by cement mortar. These materials are porous, and they absorb water. When water penetrates the masonry walls, it can cause the following problems:

  • Mold and Mildew Growth: When moisture seeps through the walls, it creates a conducive environment for mold and mildew growth. These organisms are unsightly and can cause respiratory health problems.
  • Efflorescence: This is the deposit of salt on masonry walls caused by water seepage. Efflorescence can damage the appearance of the walls, making them look unsightly and deteriorated.
  • Deterioration: The freeze-thaw cycle that occurs when water penetrates masonry walls can lead to their deterioration over time. This can weaken their integrity, causing serious structural problems.

Exterior Waterproofing Solutions for Masonry Walls

If you want to protect your masonry walls from water damage, there are several exterior waterproofing solutions that you can choose from. Some of the common ones include:

1. Exterior Housewrap

Exterior housewrap is a material used to protect the exterior of a house from water penetration. It’s a synthetic material that wraps around the exterior walls, providing exceptional waterproofing. This material is installed during the construction process and acts as a barrier that stops water from penetrating the walls.

2. Exterior Coatings

Exterior coatings such as acrylic or elastomeric coatings are applied to the masonry walls to prevent water ingress. They are affordable, compatible with different types of masonry materials, and have good flexibility, making them an excellent choice for masonry walls.

3. Masonry Sealers

Masonry sealers penetrate the pores of the masonry walls, forming a waterproof barrier that stops water from penetrating the walls. They are available in different formulations, including siloxane, acrylic, and silicone, offering different levels of protection.

4. Drainage Systems

A drainage system involves digging around the exterior walls and installing a drainage matting. This system allows water to Drain away from the house, preventing water from penetrating the walls. The drainage matting is made of a high-density polyethylene material that keeps water from penetrating the foundation.

5. French Drains

French drains are trenches that are dug around the perimeter of the house to collect groundwater and direct it away from the foundation. They consist of perforated pipes that allow water to enter; the pipes then direct the water to the drain or a sump pump.

Frequently Asked Questions (FAQs)

1. How Do I Know if My Walls Need Waterproofing?

You can know if your walls need waterproofing if you notice water stains or efflorescence on them. You may also notice mold, mildew, or fresh water infiltration on your walls. If you’re unsure, you can hire a professional to inspect your walls and recommend the best waterproofing solution.

2. What’s the Best Waterproofing Solution for Masonry Walls?

It depends on the type of masonry material, location, and the level of water infiltration. You can opt for exterior coatings, masonry sealers, exterior housewrap, drainage systems, or French drains. However, an experienced professional can help you choose the best solution based on your needs.

3. How Much Does Exterior Waterproofing cost?

The cost of exterior waterproofing varies depending on the solution used, the size of the house, and the level of water infiltration. It’s best to get a quote from a professional who can assess your situation and recommend the best waterproofing solution.


Exterior waterproofing solutions are essential for protecting your home from water damage. Masonry walls are vulnerable to water ingress, which can lead to mold and mildew growth, efflorescence, and deterioration. Fortunately, there are several exterior waterproofing solutions to choose from, including exterior housewrap, exterior coatings, masonry sealers, drainage systems, and French drains. By selecting the right waterproofing solution, you can keep your masonry walls protected, ensuring that your home remains structurally sound for years to come.

Cape Town Waterproofing

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