What is Repointing and When is it Needed?
Posted on 29th January 2025 at 11:34
Over time, weathering and decay can cause the mortar between bricks to deteriorate, compromising a brickwork's structural integrity and appearance. This is when repointing shows its value.
So, what is repointing?
This article will explore what repointing is, the signs that indicate it may be needed, and the benefits of timely installation to preserve the longevity and aesthetic of your brickwork.
What is Repointing?
Repointing refers to renewing the external part of the mortar joints of brick masonry and replacing it with fresh mortar to improve the structural stability and appearance of the brickwork. It requires specialised skill to ensure the new mortar matches the original in terms of composition, colour and texture. Repointing not only revitalises the aesthetic appeal of masonry but also safeguards against weather damage and structural instability.

Repointing Correctly
The quality of professional brickwork repointing is important to ensure the safety and longevity of the building. For instance, the mortar composition should match the existing mix to avoid damaging the masonry, with lime-based mortars preferred for historic buildings due to their flexibility and breathability. The mortar should be weaker than the bricks it binds, ensuring that the mortar absorbs any movement, thermal expansion, or stress rather than the masonry. Further, mortar should be more permeable than masonry to allow moisture to evaporate through the joints rather than being trapped in the bricks or stones.
The Signs that Brickwork Repair is Required
Cracks in the Brickwork or Mortar
Cracks in the brickwork or missing mortar can weaken the building, potentially leading to instability and safety hazards. They can also allow water penetration, leading to dampness, mould growth and the deterioration of internal structures like timber frames. Additionally, cracked bricks and missing mortar can allow cold air to infiltrate the building, leading to increased drafts, and ultimately making the interior environment uncomfortable.
Crumbling or Missing Mortar
Crumbling or missing mortar can create unsightly gaps, detracting from the property's appearance. It can also cause the interior to lose heat, making the building more expensive to heat and less energy-efficient.
Spalling Bricks
Pieces of the brick surface flaking off can indicate significant deterioration. Poor-quality bricks and frost damage usually cause this. It can also pose a safety hazard, as loose fragments can fall and injure passersby, so getting it repaired as soon as you see it is essential to avoid potential accidents.
Damp or Moisture Issues
Mould growth due to dampness within brickwork, which can arise from various sources including rising dampness, penetrating dampness and condensation, is a significant sign of repointing requirements. Not only can it pose a health risk to occupants' health, but it can also damage internal structures like plaster, paint, and timber, leading to costly repairs. Additionally, damp environments can create an unpleasant smell, creating an unhealthy and uninviting living environment.
Loose or Missing Bricks

Noticing loose or missing bricks is a massive sign of a well-needed repair. A vast area of missing or loose bricks can significantly weaken the wall, increasing the risk of collapse, especially during high winds or heavy snowfall. Loose bricks also pose a safety hazard, as they can easily fall and injure people, so they should be repaired immediately.
Discolouring or Staining
Discolouration or staining on brickwork can indicate algae growth caused by underlying problem dampness or rising dampness. If the underlying issues are not repaired and the bricks and mortar are not replaced, the property's value and kerb appeal can significantly diminish.
What are the Benefits of Repointing?
Enhanced Structural Integrity
Mortar joints act as a binding agent, keeping bricks or stones firmly in place. If the mortar starts to crumble, crack or go missing, it can weaken the masonry, increasing the risk of structural failure. Therefore, it's essential to repoint to ensure the building remains safe and secure. Timely repointing provides a reliable solution to reinforce the overall structure and avoid costly repairs caused by neglected damage.
Improved Energy Efficiency
Damaged or missing mortar allows drafts and cold air to infiltrate, increasing the reliance on heating systems. Repointing to fill gaps can be a cost-effective way to help create a more airtight structure that retains heat during the winter and keeps interiors cooler in the summer, reducing energy consumption and ultimately lowering energy bills. As it helps reduce carbon emissions, repointing is an environmentally responsible choice for residential and commercial properties.
Preserve Brick Structures' Longevity
Mortar deterioration exposes bricks to weather elements, leading to potential damage like spalling or cracking. Repointing prevents such damage by promptly addressing mortar issues, extending the masonry's durability. For instance, repointing heritage properties by matching the new mortar to the original not only maintains the building's authenticity but can also provide lasting protection and its historical value, ensuring the building stands the test of time.
Prevention of Further Damage
Neglected mortar issues can lead to various structural problems that can become costly. Repointing can halt this progression by addressing the root cause directly. Ensuring minor problems are resolved before they become worse can help maintain structural integrity and safety.
Prevention of Water Penetration
Moisture can seep through gaps, causing dampness, mould and mildew in interior spaces. Prolonged exposure to water can also weaken the masonry, leading to spalling or frost damage. Repointing reduces the amount of water that can enter through the mortar joints, protecting the structure from the harmful effects of moisture. Not only does it effectively safeguard the exterior, but it also ensures the interior maintains a comfortable and dry environment.
Pest Deterrence
Pests like insects and rodents can further damage cracked or crumbled mortar and crawl into the interior for shelter and food. To avoid infestation, it's essential to seal any vulnerabilities within the mortar to deter pests from nesting inside the property. This will help to maintain a clean, secure and pest-free environment.
Cost-Effective
Investing in brickwork repointing is a proactive approach to preserving property value and ensuring long-term savings. It prevents structural issues, water damage, interior deterioration, and pests from entering, which can lead to significant repairs and infestations, helping to save money in the long run.
About the Author
Patrick Brown
Patrick is the owner of My Elegant Home, Birmingham's premier painting and decorating and home renovation firm. With over two decades of experience transforming homes and businesses across the West Midlands, Patrick's passion for perfection and eye for detail have earned My Elegant Home a reputation for high-quality work at affordable prices.
Share this post: