Common Mistakes to Avoid When Repointing Bricks

Everyone admires brick buildings and structures because of their charm and durability. However, even the sturdiest structures require maintenance over time, especially when the mortar between the bricks begins to deteriorate. Repointing, the process of renewing the external part of mortar joints, is an efficient way to maintain the integrity and appearance of brickwork, especially when dealing with a compromised masonry foundation. To learn about signs of a bad masonry foundation, explore our guide on this. While repointing might seem simple, it often goes wrong and can lead to unsatisfactory results or even structural damage if not done correctly. In this blog, we will explore the common mistakes to avoid when repointing bricks and how to complete a project successfully.

Using the Wrong Mortar Mix

An essential consideration during the repointing process is selecting the correct mortar mix. The mortar used in older buildings, especially those constructed before the 20th century, is often lime-based, which is softer and more flexible than modern cement-based mortar. Using a hard, cement-based mortar on older brickwork can lead to cracks and damage as it doesn’t allow the natural movement of the building. Always match the new mortar as closely as possible to the original, considering factors like color, texture, and composition. A professional mason can help you find the appropriate mortar mix for your specific project.

Ignoring the Weather Conditions

Weather plays a significant role in the success of a repointing job. Repointing in extreme temperatures—either too hot or too cold—can prevent the mortar from setting properly and lead to premature damage. Mortar needs time to cure slowly, and ideal conditions include moderate temperatures and humidity. If the weather is too hot, the mortar can dry out too quickly, leading to weak joints. Conversely, if it’s too cold, the mortar can freeze before it has a chance to set. It's best to schedule repointing projects during mild weather conditions and to protect the work area from direct sun, wind, or rain.

Removing Too Much Old Mortar

When preparing bricks for repointing, it’s essential to remove the deteriorated mortar without damaging the surrounding brickwork. However, a common mistake is to remove too much mortar. Removing too much mortar can weaken the structure and make the repointing process more difficult. You can remove the old mortar to a depth of about 1 to 1.5 times the width of the joint. Using power tools for this task can be risky, as they might chip or damage the bricks. It’s often better to use hand tools, such as a chisel and hammer, to carefully remove the mortar without harming the brickwork.

Failing to Properly Prepare the Joints

Proper preparation of the joints is crucial for ensuring the new mortar fixes well and lasts for years. This step involves cleaning out the joints thoroughly after removing the old mortar, ensuring there is no loose debris or dust. Avoiding cleaning the joints properly can result in poor adhesion of the new mortar, leading to cracks and other damages. Additionally, it’s essential to add moisture to the joints before applying new mortar to prevent the dry bricks from absorbing too much water from the mortar.

Applying Mortar Incorrectly

Applying the mortar correctly helps in providing an aesthetically pleasing and durable finish. One common mistake is to apply the mortar too thickly, which can cause it to crack as it dries. Another mistake is to apply it unevenly, leading to an unprofessional and ugly appearance and potential structural issues. The mortar should be packed tightly into the joints, and the surface should be smoothed and tooled to match the existing joints.

Not Matching the Mortar Color and Texture

The appearance of your brick structure is just as important as its structural integrity. A common mistake is failing to match the color and texture of the new mortar to the existing brickwork, resulting in a patchy, mismatched appearance. This can reduce a building's overall aesthetic and value. To avoid this, take the time to mix and test the mortar to achieve a close match before starting the project. If necessary, consult with a professional mason who has experience with historic brickwork to ensure the new mortar blends properly with the old.

Noting Applying Mortar as Per Joint Profile

The way the mortar is shaped within the joint plays a crucial role in both the appearance and stability of the brickwork. Common shapes of mortar include concave, flush, and weather-struck joints. Each joint shape offers different levels of protection against water infiltration. Choosing the wrong profile or failing to tool the joints correctly can lead to water penetration and damage to the brickwork over time.

Underestimating the Time and Skill Required

Repointing brickwork is a difficult process that requires a high level of skill and attention to detail. A common mistake that non-professionals make is underestimating the time and expertise required to do the job correctly. Rushing through the process of taking shortcuts can lead to subpar results that may require costly repairs in the future. If you’re not experienced in masonry work, it’s best to opt for a professional who can ensure the job is done right the first time.

Conclusion

Repointing brickwork is an important maintenance task that can significantly extend the life of a building. Moreover, it preserves the overall appearance and value of the structure. However, it’s a job that requires careful planning, the right materials, and skilled execution. By avoiding these common mistakes, you can ensure your repointing project is successful. If you don’t have the necessary experience, hiring a professional mason is often the best way to achieve high-quality, long-lasting results.

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