How to Tell if Your Exterior Windows Need New Caulking
The Quick Answer:
You can tell your exterior windows need new caulking if you notice cold drafts around the window frame, visible cracks or peeling in the existing sealant, an increase in your energy bills, or condensation trapped between the glass panes. Replacing degraded exterior caulking is critical for home energy efficiency and preventing water damage.
Why Caulking Fails Over Time
Exterior window caulking expands and contracts with extreme temperature changes. In the Greater Toronto Area, where temperatures can swing from 30°C in the summer to -20°C in the winter, standard caulking degrades, hardens, and eventually cracks over a period of 5 to 10 years.
Top Signs It’s Time for Re-Caulking:
- Visible Deterioration: The sealant looks dry, brittle, shrinking, or is physically peeling away from the brick or siding.
- Drafty Rooms: If you hold your hand near the edge of the window on a windy day and feel a breeze, the seal is broken.
- Water Stains: Discoloration on the drywall or peeling paint directly below a window sill indicates water is bypassing the exterior seal.
Replacing window caulking not only protects your home’s structural integrity but also significantly lowers heating and cooling costs.