How often should I re-caulk around my window exteriors?

Exterior window caulking should be inspected annually and typically needs refreshing every 3-5 years, though Ottawa's harsh freeze-thaw cycles often require more frequent attention than milder climates.

Signs it's time to re-caulk include visible cracks, gaps where the caulk has pulled away from the window frame or siding, or if you can feel air drafts around the window perimeter. In Ottawa's climate, the constant expansion and contraction from temperature swings between -30°C winters and +30°C summers puts extra stress on exterior caulking, causing it to fail faster than in more temperate regions.

Quality matters significantly for exterior window caulking in our climate. Use a high-grade polyurethane or hybrid polymer caulk rated for exterior use and temperature extremes. Avoid basic acrylic caulks for exterior applications - they'll crack and fail within 1-2 years in Ottawa weather. The best time to re-caulk is during dry, mild weather in late spring or early fall when temperatures are consistently above 10°C.

Proper preparation is crucial for long-lasting results. Remove all old, failed caulk completely before applying new material. Clean the surfaces thoroughly and ensure they're completely dry. Apply the new caulk in a continuous bead and tool it smooth for proper adhesion and a clean appearance.

Don't forget the top of the window - many homeowners focus on the sides and bottom but miss the header area where water intrusion is most likely. Poor exterior caulking around windows is one of the leading causes of water damage and energy loss in Ottawa homes.

For a comprehensive window maintenance assessment, consider having a professional window installer evaluate your home's exterior sealing during your annual inspection.