Why Window Caulking Is One of the Most Important Renovations for Your Property

Window caulking is an essential step for ensuring the watertightness and durability of your home, building, or structure. Indeed, a poorly caulked window can lead to water infiltration, heat loss, and, over time, structural damage. When neglecting caulking joints, moisture caused by repeated leaks can result in mold growth and deterioration of the materials surrounding your window.

Furthermore, your heating or air-conditioning system will have to compensate for air leaks, increasing your energy bills. By keeping your doors and windows properly sealed, you also help protect the environment by reducing your energy consumption. Since 2022, the Government of Québec, in partnership with Hydro-Québec, has introduced the LogisVert program, offering households a credit that covers part of the costs related to window caulking services, doors, and other openings around a property. When done correctly, window caulking can significantly reduce energy bills and improve comfort in apartments, offices, and houses.

Whether you hire a Montreal caulking company or do it yourself, we suggest becoming familiar with the proper method of ehttps://calfeutrageapex.com/caulking-window/caulking-is-the-best-window-insulator-for-winter-find-out-why/xterior window caulk application.

The 7 Steps to Replacing the Caulking on a Window

  • Remove the old caulking from the window using pliers: First, carefully remove the existing layer of caulk, taking out the large pieces.
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Eliminate stubborn caulking remnants: Some residues can be particularly hard. Use specialized tools to ensure no trace of the old product remains.

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Dust and clean: Brush or blow away dust and small debris that could compromise the new caulk’s adhesion.

Use a solvent: Apply a cleaning product to remove any final impurities from the old window caulking, ensuring a perfectly clean surface.

nettoyer les surfaces avec un solvant

Insert a Backer Rod if the gap is wider: This rod prevents the sealant from sinking too

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Apply silicone caulking: Use a high-quality sealant that resists UV rays and extreme weather conditions.

Application de calfeutrage des fenêtres et des portes

Shape and smooth: Finally, shape and smooth the joint to ensure optimal watertightness and a uniform finish, free of bumps or air bubbles.

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Check out how it’s done in a video: Click here to see “Window Caulking in 7 Steps” in action.Click here to learn more about how to remove old window caulking.

Window Caulking: Do’s and Don’ts

What Happens If You Don’t Remove the Old Caulking? If you do not completely remove the old exterior window caulk before applying new caulk, the risk of cracks and water infiltration increases significantly. Residual sealant can create gaps where moisture can seep in. Moreover, the new product may not adhere properly, making the window caulking less effective and shortening its lifespan. In the long run, you could face more costly problems than a simple preventive replacement.

A Professional Approach to Window Caulking: Protecting Your Property’s Integrity

Although window caulking does not require special architectural planning and is not directly tied to a building’s structural support or frame, it can indirectly impact the stability, health, and integrity of the property. As mentioned earlier, water infiltration can cause damage depending on its frequency and severity. A small leak that occurs once or twice at a low level might only require using a dehumidifier and a fresh coat of paint. However, repeated infiltration caused by cracked, broken, or missing window caulking can compromise an entire wall, leading to mold and rot that could spread to lower floors of a home or building.

It’s not uncommon for someone on the second floor to notice water damage, only to discover that the real source of the problem is a cracked patio door seal several floors up. A professional approach involves regularly inspecting the sealants around every opening and replacing them as needed. If one or two windows show signs of deteriorating caulk—especially if that caulk is 15 years old or more—it’s likely that other joints will fail soon as well. Therefore, when it’s time to tackle window caulking, the most effective method is a complete replacement following the appropriate steps to ensure a durable, comprehensive solution.

Window Caulking Services by Calfeutrage Apex on the South Shore & in Montreal


At Calfeutrage Apex, we offer a full range of specialized window caulking services and solutions for other openings as well. Our team carefully inspects each joint to determine the optimal approach and provide the best solution for your individual home, condo, or commercial building. We use only top-quality materials, ensuring the durability and reliability of our work. When you choose Calfeutrage Apex, you receive professional service, recognized expertise, and peace of mind in the face of Montreal’s and the South Shore’s weather conditions. Trust our know-how for window caulking performed to the highest standards—and protect your investment for the long term.