Comment le rejointoiement affecte-t-il l'isolation thermique d'une maison? (Guide 2024)
Reading time: 4'

How does repointing affect the thermal insulation of a house? (Guide 2024)

How Does Repointing Affect a Home's Thermal Insulation?

Masonry, a cornerstone of Montreal's architectural heritage, is also an essential component of our modern homes. Whether you reside in Montreal, Laval, Longueuil, on the South Shore, or the North Shore, maintaining your masonry is crucial to ensuring the comfort and energy efficiency of your residence. In this article, we will delve deep into the subject of repointing and its impact on a home's thermal insulation.

The Significance of Thermal Insulation

Before we tackle the topic of repointing, it's crucial to understand why thermal insulation is so essential in our homes. In Montreal, where winters can be harsh and summers hot and humid, effective thermal insulation can make all the difference in terms of comfort and energy savings.

Thermal insulation in a home involves reducing heat transfer between the interior and exterior. This means that in winter, heat should stay inside the house, while in summer, outdoor heat should remain outside. Efficient thermal insulation helps maintain a comfortable indoor temperature throughout the year while reducing the reliance on heating and cooling systems.

The Role of Repointing

Now that we understand the importance of thermal insulation, let's take a closer look at the role of repointing in this context.

Repointing, or the repair of masonry joints, is an essential process to maintain the structural integrity of a masonry building. It involves redoing the joints between bricks or stones, preventing water infiltration, and reinforcing the stability of the wall. However, this process also has a significant impact on a home's thermal insulation.

How Repointing Affects Thermal Insulation

  1. Reducing Air Infiltration: One of the primary ways repointing improves thermal insulation is by reducing air infiltration. Defective joints can allow cold or hot air to enter the home, making it challenging to maintain a constant indoor temperature. By repairing these joints, you can reduce these undesirable air infiltrations, resulting in improved insulation.

  2. Enhancing Energy Efficiency: A well-insulated home requires less heating in winter and less cooling in summer. Consequently, proper repointing contributes to lower energy consumption and, consequently, lower energy costs. It can also have a positive impact on the environment by reducing greenhouse gas emissions.

  3. Preventing Moisture Issues: Damaged joints can allow moisture to penetrate the walls, leading to mold growth and material deterioration. By repairing these joints, you avoid moisture problems, helping to maintain a healthy and comfortable indoor environment.

  4. Preserving Heat: Intact joints help retain heat inside the home. By reducing heat loss through the walls, repointing helps maintain a stable and comfortable indoor temperature.

The Repointing Process

Now that you understand the importance of repointing for thermal insulation let's briefly go over the repointing process.

  1. Initial Inspection: A masonry professional will conduct a thorough inspection of your masonry to identify damaged or defective joints.

  2. Preparation: Before starting repairs, it's essential to prepare the area by removing old joints and cleaning the surface to ensure optimal adhesion.

  3. Repointing: The professional will apply new mortar to the joints, ensuring they are uniform and robust.

  4. Finishing: Once the mortar has cured, the joints will be smoothed for a clean and aesthetically pleasing finish.


In conclusion, repointing is a key element in maintaining your home's thermal insulation at its best. Whether you live in Montreal, Laval, Longueuil, the South Shore, or the North Shore, ensuring that your masonry joints are in good condition can have a significant impact on your comfort, energy savings, and the longevity of your home.

If you're looking for professional repointing services in the Montreal area, don't hesitate to contact us at Masonry Montreal. We are here to help you preserve the beauty and functionality of your masonry while improving your home's thermal insulation.

Leave a comment

Please note, comments need to be approved before they are published.