Is Waterproofing Brickwork a Good Idea?

The debate over whether or not to waterproof brickwork can be complex and often depends on the specific circumstances and the goals of the project. This article aims to provide clarity on when and how waterproofing brickwork might be beneficial, along with addressing the common concerns and drawbacks associated with it.

When Waterproofing Brickwork Can Be Beneficial

Preventing Moisture Intrusion: Sealing brickwork can effectively protect it from water infiltration. Moisture can seep into brick walls through hairline cracks in the mortar joints, leading to structural damage over time. A good sealer can help bridge these cracks and prevent water from penetrating. For areas subject to high humidity or frequent rainfall, applying a high-quality sealer can provide an effective barrier against moisture.

Preventing Efflorescence: In regions where the soil contains high levels of soil salts, efflorescence can be a significant problem. Efflorescence occurs when water carrying salts from the ground penetrates the brick, dissolving the salts, which are then released onto the surface of the brick. This results in a white, powdery crust that can be unsightly. A well-applied sealer can help prevent this issue by reducing the movement of water through the brick.

Note: For best results, wait until the efflorescence has disappeared and the brick are fully dry before applying any sealer. Additionally, the sealer should be appropriate for the specific type of brick and mortar used, as not all sealers are suitable for all surfaces. It is often advisable to consult with local brick suppliers for recommendations on suitable products.

When Waterproofing Brickwork Is Not Recommended

Brickwork Design: Brick is a permeable material that is designed to allow moisture to pass through its surface. This characteristic is crucial for the overall integrity of the brick structure. Sealing brickwork can inhibit this natural process, potentially leading to issues such as mold growth, deterioration of mortar, and structural weakening.

Basement Brickwork: For brickwork located below grade, such as in the basement of a house, waterproofing can be more necessary. In these cases, waterproofing the exterior of the wall facing the water source is crucial to minimize water migration into the wall. However, it is important not to seal the other side, as this can trap moisture and lead to mold growth and material degradation.

Efficiency of Sealing: Not all sealers on the market are equally effective. A poorly selected or improperly applied sealer can compromise the structural integrity of the brick. Therefore, it is essential to use high-quality products and follow appropriate application techniques.

Best Practices for Waterproofing Brickwork

Selecting the Right Sealer: Choose a sealer that is specifically designed for brickwork and is compatible with the type of brick and mortar used. This can include toppings, breathable sealers, or oil-based products. Always refer to manufacturer guidelines for proper application instructions.

Application Technique: Proper application is critical for the effectiveness of any sealer. Ensure the brickwork is clean and dry before applying the sealer. Apply in a consistent, even layer to avoid drips or pooling that could lead to uneven protection.

Long-Term Maintenance: Regular inspections and touch-ups may be necessary to maintain the effectiveness of the sealer. Over time, sealers can degrade or be damaged, so it is important to monitor the brickwork and reapply as needed.

Conclusion

The decision to waterproof brickwork should be carefully considered based on the specific needs and location of the brickwork. While sealing can protect against moisture damage and efflorescence, it can also inhibit the natural breathing of brick. Understanding the benefits and potential drawbacks of waterproofing is key to making an informed decision that will best serve the longevity and appearance of the brick structure.

Keywords: brick waterproofing, brick sealer, efflorescence, water migration, exterior waterproofing