Quick Answer
For south-facing windows, seal gaps and cracks with proper weatherstripping, caulk, or spray foam to prevent cold air infiltration and maintain warm temperatures. Apply weatherstripping to moving parts, and inspect for gaps around windowsills and frames. Regular maintenance ensures a tight seal.
Inspecting and Preparing the Window
Inspect the south window for gaps and cracks, paying close attention to the window frame, sills, and moving parts. Use a flashlight to illuminate the area, and apply a small amount of soapy water to help identify air leaks. Use a candle or incense stick to detect air movement, which will help you locate specific areas that need attention.
Applying Weatherstripping and Caulk
Cut and apply weatherstripping, such as felt or foam tape, to moving parts like hinges, handles, and thresholds. For non-moving areas, use a bead of caulk or spray foam to seal gaps around windowsills and frames. Use a caulk gun to apply caulk, and ensure it’s dry before exposing it to the elements.
Maintaining the Seal
Regularly inspect the weatherstripping, caulk, and spray foam to ensure they remain effective. Replace weatherstripping as needed, and reapply caulk or spray foam to any gaps that have reopened. Consider re-caulking every 3-5 years, depending on exposure to the elements and local climate conditions.
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