Where are window weep holes located?

Author: Elouise Beer  |  Last update: Tuesday, February 24, 2026

Typically located on the bottom part of windows, they are commonplace in sliding windows, double-hung windows, and other windows with sashes that can collect water. Window weep holes drain the window's frame of moisture and water that may accumulate within the structure.

Where should weep holes be located?

Gravity draws water to the bottom of the wall, just above the foundation, where weep holes allow it to escape. They are located above all windows, doors, and other openings. Weep holes are also located on window tracks.

How do you know if a weep hole is clogged?

ANSWER - Having wet grout around the drain does suggest that the weep holes at the waterproof membrane level might be plugged.

Where are drainage holes on windows?

Weep holes are small openings located at the bottom of the exterior frame of your replacement window. Although not all windows have weep holes, you may see them on vinyl or metal window frames. Weep holes aren't just there for looks, they are designed to drain water from your windows.

What does a weep hole look like?

Weep holes in brick walls usually appear as small vertical spaces that are left during construction in the mortar of brickwork. They allow moisture to escape from brick cavity walls, which helps to prevent the buildup of water and condensation.

How Window Weep Holes Work | Anlin Windows & Doors

How to unclog window weep holes?

If they're clogged, open them up with a brush, a screwdriver or a toothpick. Clear away leaves, twigs and dirt that accumulate on the windowsill.

What happens if window weep holes are blocked?

Weep holes in windows provide an avenue for water to safely leave the window's frame. Without this clear path, the water remains trapped. Consequently, your views may be obstructed by foggy windows on a hot day as condensation occurs.

How do you check a weep hole?

How to identify weep holes
  1. Look for gaps in the mortar between the bricks: Weep holes are typically small gaps in the mortar between the bricks, located near the bottom of the external wall. ...
  2. Check for patterns: Weep holes are usually located in a pattern of one every few feet along the bottom course of the brickwork.

How do you fix a clogged weep hole?

If you notice one is clogged, all you really need to do is to grab a really thin, straight object such as eye-glasses screwdriver. Find the outside exit of the weep hole and gently clear it out with the end of your tool, then find the inside and push any debris through from there as well.

Can water leak through weep holes?

This research demonstrated that even under truly extraordinary conditions water rarely enters the weephole and even if it does it cannot be blown high enough up in the cavity to create internal damp problems. To understand why, it's important to look at the details of a correctly constructed cavity wall.

How often do weep holes go?

The Weep Vent should be spaced at no greater than 900mm centres to meet N.H.B.C guidelines, which state, “weep holes are recommended to be sited at every 450mm maximum with at least two per opening above all windows and doors.”

When did weep holes become code?

Even if you used the code as a basis of the requirement for weep holes, you would be surprised to learn that weep holes were nor mandated in the single family code until 1983 CABO, mandated by the 1985 Kentucky Building Code. Home inspectors are calling out missing weep holed on house built before 1985.

What happens if my window doesn't have weep holes?

Window weep holes are easy to maintain. If a window doesn't have them, they can be added to an existing window by drilling a small hole in the bottom of the frame but it is important to know what you're drilling into. This is best handled by a professional contractor.

Can bugs get in through window weep holes?

Typical weep hole at the sill of a window extrusion. Moisture can enter as a vapor or liquid into the window extrusion. Wasp entering weep hole at the sill of a window. In addition to insects and bugs, dirt and other organic materials can enter the weep holes.

Do Andersen windows have weep holes?

pathway in the Andersen® Window and Door Help Center. The weep holes can be seen from the exterior of the unit, at the bottom of the sill. After the water passes through the sill itself, it drains out through the weep holes.

How to find window weep holes?

The weep hole is simply a tiny rectangular opening in the bottom of the window's outer frame. It is designed to provide easy drainage to prevent standing water in the bottom track of the outer frame. Weep holes in window frames are most commonly found in metal or vinyl replacement windows.

Where are weep holes placed?

Weep holes must be placed di- rectly above flashing and should be spaced about 16 to 24 inches o.c. maximum. The most common types of weep holes are open head joints, louvered vents, rope wicks, tubes, cellular vents, or a combination of these.

Are weep holes really necessary?

Without masonry weep holes, or if the existing drainage system is blocked or broken, capillary action can result in the water becoming trapped inside the cavity wall.

How to test weep holes?

Fill the track with water until it is filled half way up the track edge. Let the water rest for at least 15 minutes. If there is no change in the water depth, there is no defect in the weep system.

Do all new windows have weep holes?

Weep holes are an essential component in the design of many windows, but not all windows include them. To understand why some windows have weep holes and others do not, it's important to explore their purpose, function, and the types of windows that typically feature them.

Why is there water on the inside track of my sliding window?

Once homeowners see any little bit of water near their windows, they start freaking out. Are you one of them? Well, we are here to tell you that it's perfectly normal! Your windows have a built-in drainage system called “weep holes.” They are strategically placed to drain any water out of your window.

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