Clean window weep holes when dirt, paint, caulk, or debris blocks the small drainage openings in the frame. Those holes exist so water can drain out instead of sitting in the window track.
Quick check
- Find the weep holes on the exterior bottom of the window frame.
- Look for dirt, dead bugs, paint, or caulk blocking them.
- Clean the track and openings gently.
- Test with a small amount of water if the window design allows it.
- Don't caulk weep holes shut.
How to clean them
- Vacuum loose debris from the window track.
- Use a soft brush or cotton swab around the opening.
- Clear stubborn debris gently with a plastic tool.
- Remove caulk only if it is covering an actual weep opening.
- Confirm water can drain out.
The Building America Solution Center notes that if weep holes have been covered with caulk, the caulk should be removed so the holes can be cleaned. Be careful not to damage the frame.
Signs they may be blocked
- Water sits in the window track after rain.
- Water stains appear below the window.
- Paint bubbles near the sill.
- Debris is visible in the weep openings.
When to get help
If water leaks into the wall, the frame is rotted, or you can't tell whether an opening is a weep hole, call a window pro. Randomly cutting holes or removing sealant can create leaks.
Good maintenance rhythm
- Twice a year (spring and fall): clear weep holes on every exterior window with a weep system.
- After heavy rain: walk the exterior and check for water sitting in the sill or trickling out a clogged opening.
- Sooner: clean if you see condensation pooling inside the lower track or paint bubbling near the sill.
- Ongoing: keep mulch, leaves, and landscaping pulled back from the bottom of the window so debris doesn't pile against the weep holes.
- Never: caulk or paint over a weep hole. It's there on purpose.