When should I replace the caulking around my windows?

You should replace window caulking every 5-7 years as preventive maintenance, or immediately if you notice cracking, shrinking, or gaps. In Ottawa's harsh climate with freeze-thaw cycles, window caulking deteriorates faster than in milder regions, so regular inspection is crucial for preventing water damage and energy loss.

Signs it's time to replace your window caulking include visible cracks or gaps, caulk that's pulling away from the window frame or siding, discoloration or mold growth, and noticeable drafts around windows. You might also notice higher heating bills during Ottawa winters, which often indicates air leaks around windows and doors. If you can see daylight around your window frames or feel cold air, the caulking has likely failed.

Ottawa's climate is particularly hard on exterior caulking due to our temperature swings from -30°C in winter to +35°C in summer. This constant expansion and contraction causes standard caulks to crack and fail prematurely. The best time to recaulk windows in Ottawa is during dry weather in late spring through early fall (May to September), when temperatures are consistently above 10°C and humidity is lower.

For exterior window caulking in Ottawa, use a high-quality polyurethane or hybrid polymer caulk rated for extreme weather conditions. These products remain flexible in cold temperatures and resist UV damage from our intense summer sun. Avoid basic acrylic caulks for exterior use - they'll crack within 2-3 years in our climate. Interior window caulking can use paintable acrylic latex, which is easier to work with and clean up.

The replacement process involves completely removing old caulk (never caulk over existing material), cleaning the surfaces thoroughly, and applying new caulk in temperatures between 10-30°C with low humidity. Poor surface preparation is the main reason caulking fails prematurely. If your windows are older or you're dealing with multiple windows, this is often part of larger maintenance that might include window repairs or replacements.

Professional consideration: While recaulking is a manageable DIY project, if you're uncomfortable on ladders or dealing with second-story windows, it's worth hiring a professional. We often include window recaulking as part of exterior renovation projects, ensuring proper materials and techniques for Ottawa's climate.

For a comprehensive assessment of your windows and caulking needs, Justyn Rook Contracting offers free consultations to help prioritize your home maintenance projects.