Windows allow natural light and ventilation into our homes, but when not properly installed or assembled, they can also become an entry point for costly water intrusion. What starts as occasional drips or dampness around window openings can soon intensify into full-blown moisture problems like soaked drywall, ruined flooring, mold growth and decay of structural wood framing over extended periods. Significant repairs from demolition to structural framing become necessary. Improperly sealed or flashed window frames provide an easy pathway for moisture to seep into wall cavities. That results in hidden water damage over time.
How Window Leaks Occur
There are several potential ways that window installation defects create water issues:
Improper Flashing
Flashing is the waterproof membrane that directs water away from the window openings during rain or condensation. If not properly integrated between the window frame and exterior wall, water can trickle into the wall cavity.
Failed Sealants/Caulking
The caulking seals around a window frame eventually shrink, crack or pull away from the opening. Any breaches allow water intrusion behind the frame.
Assembly Defects
Even before installation, manufacturing defects like improperly joined frame corners can prevent the window from forming a waterproof seal once in place.
Signs of a Leaky Window
While water stains below the window are the obvious red flag, other hidden signs of moisture issues from leaky window frames include:
- Swelling/deteriorating wood around the frame
- Peeling paint or wallpaper near the window
- Musty odors
- Mold growth inside a wall cavity
- Exterior siding damage
Preventing Problems
New and properly installed windows are crucial to avoid leaks. Examining exterior caulking annually and re-caulking any deteriorated seals is recommended on existing windows. Some windows may require a membrane drainage plane installed on the exterior for enhanced waterproofing.
What seems like a minor window leak can lead to widespread water damage inside wall cavities. Addressing any faulty frames, flashing, or sealing deficiencies promptly prevents more extensive repairs down the road from rot, mold, and structural decay. Don’t let windows open the door for water damage to your home.