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  • Writer's pictureZack Jurkowski

The Importance of Vapor Barriers in Renovations

As a general contractor in Montreal, I've seen my fair share of home renovations, and one of the most overlooked aspects of a renovation project is the importance of vapor barriers. Many homeowners don't realize that even if the rest of their home doesn't have a vapor barrier, adding one during a renovation project is essential, especially in a climate like Montreal that experiences harsh winters and hot, humid summers.

Why Vapor Barriers Matter

Vapor barriers are a critical component of any building envelope. They're designed to prevent moisture from penetrating the walls and ceiling of your home. In cold climates like Montreal, moisture can build up on the inside of exterior walls, leading to mold growth and structural damage. In hot and humid climates, vapor barriers help prevent moisture from penetrating the walls and ceiling, leading to rot and other structural issues.

Permeability of Building Materials

Today's building materials are more permeable than the materials of yesteryear, like lath and plaster or button board. While these older materials had their own issues, they did provide a degree of natural moisture control. Newer materials, like drywall, are more porous, allowing moisture to penetrate more easily. This is why it's even more essential to include a vapor barrier during a renovation project.

The Importance of Professional Installation

Adding a vapor barrier during a renovation project is not overly complicated, but it is a highly detailed job. It requires diligence during installation to ensure it's done correctly. A licensed contractor can help you choose the right type of vapor barrier for your home and install it properly. Proper installation is essential to ensure that the vapor barrier is effective in preventing moisture from penetrating the walls and ceiling.

The Benefits of a Properly Installed Vapor Barrier

A properly installed vapor barrier offers several benefits for your home. It can help prevent mold growth, structural damage, and rot. It also improves energy efficiency by reducing the amount of heat loss in the winter and heat gain in the summer. This can save you money on your heating and cooling bills and make your home more comfortable year-round.


In conclusion, the importance of vapor barriers in Montreal renovations cannot be overstated. Not only do they protect your home from mold growth, rot, and structural damage, but they also improve energy efficiency and make your home more comfortable year-round. As a licensed general contractor in Montreal, I highly recommend that homeowners include a vapor barrier in their renovation projects, even if their home doesn't have one. And when it comes to installation, don't cut corners. A professional contractor can ensure that your vapor barrier is installed correctly and provide you with the peace of mind that your home is protected for years to come. So if you're planning a renovation project, be sure to add a vapor barrier to your to-do list. Your home, your comfort and your energy bill will thank you for it!


Montreal Contractors is a qualified company, holding an active bonded license as a General Contractor and Specialized Contractor with the Régie du Bâtiment du Québec (RBQ License: 5767-5480-01), ASP Health & Safety Certification and a $2M liability policy. Our employees have all passed background checks, are registered with CNESST and have their ASP Health and Safety certification.

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