Awning window leaking

Symptoms

• Water on the sill or wall below the window during rain
• Staining or bubbling paint under the window
• Drips visible around the hinge side
• Musty smell near the window after storms

Likely causes

• CommonClogged weep holes at the bottom of the frameThese small drainage holes let water that gets past the seal drain back outside; when blocked, water backs up inside.
• CommonWorn weatherstripping around the sashCompressed or torn seals let wind-driven rain through.
• CommonFailed exterior caulk at the frame-to-wall jointCracked caulk lets water behind the trim rather than running off it.
• PossibleSash not closing tightly due to worn crank/hingesA gap from mechanical wear lets rain in even with good weatherstripping.
• Less commonImproper flashing above the windowMissing or damaged flashing can direct roof or wall runoff into the frame.

What to do

1. Locate weep holes (small slots along the bottom exterior of the frame) and clear them with a thin wire or pipe cleaner.
2. Check weatherstripping around the full perimeter of the sash for gaps, tears, or flattening and replace as needed.
3. Inspect exterior caulk around the frame's edge where it meets siding or brick; scrape out cracked caulk and reapply.
4. Confirm the crank pulls the sash fully closed and tight against the weatherstripping.
5. During the next rain, watch (or check right after) where water is actually entering to confirm the source.
6. If leaks continue after sealing and clearing weep holes, check for damaged flashing above the window, which may need a roofer or siding contractor.
7. Dry and treat any interior wood or drywall that got wet to prevent mold or rot.

Tools and parts

• Thin wire
• Caulk gun
• Utility knife

When to call a pro

Call a window or siding contractor if leaks continue after sealing and clearing weep holes, since flashing or the window itself may be at fault.

Safety