What are weep holes?
Weep holes are small drainage openings in the sill or frame of a window that permit water, condensation, and moisture to drain outward rather than accumulate inside the frame.
Found along the bottom of a window sill or in the frame itself, weep holes are tiny openings (typically the width of a pencil lead) designed to channel water away from the interior. Rain that enters the frame cavity or condensation that builds up inside needs an escape route. Without weep holes, that moisture sits trapped against wood, vinyl, or aluminum, leading to rot, mold, and structural failure over time.
Connecticut's humid climate and freeze-thaw cycles make weep hole function especially critical. During spring snowmelt or after heavy rain, water naturally collects in the sill pan. Properly positioned weep holes allow this water to drain to the exterior before it seeps into walls or causes interior water damage.
Blocked weep holes are one of the most common culprits behind window leaks. Dirt, debris, paint, caulk, or even insulation can seal these openings, turning them from protective features into liabilities. Once blocked, water has nowhere to go but inward. Homeowners often notice water stains on interior walls, soft spots in the sill, or mold growth when weep holes fail.
Regular inspection and clearing of weep holes during maintenance prevents expensive repairs down the line. A window repair specialist can verify that holes are clear and positioned correctly for your Connecticut home's exposure and site conditions.