How do you test a window weep hole?

Author: Vida Schamberger  |  Last update: Wednesday, March 11, 2026

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.

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 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.

What happens if window weep holes are blocked?

Small holes located on the bottom edge of storm-window frames, weep holes are drains for your windows. If they become blocked by debris, paint or caulk and can't serve this vital function, water can seep into the wood of the sill and cause it to rot.

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.

How Window Weep Holes Work | Anlin Windows & Doors

Should window weep holes be covered?

Window weep holes allow window frames to drain water and moisture and, therefore, should not be blocked when sealing windows.

What happens if you seal weep holes?

If the weep holes are blocked to prevent drainage from occurring, the water can build up in the extrusion and ultimately leak into the wall cavity if a leakage path is available.

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.

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.

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.”

What does a window weep hole look like?

Weep holes are often rectangular and have a flap covering them. The flap opens one way to let the water flow out of the window and prevent it from flowing back in. Depending on the age of your windows, weep holes may look different. Weep holes serve as drains for water to keep the water from getting inside your home.

Can weep holes get blocked?

Over time, weep holes can become clogged with vegetation or algae growth, reducing their effectiveness. If the weep holes outfall above ground level, they can be unsightly, particularly after many years of water staining or algae growth on the wall face.

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.

Can water seep 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.

Is it normal for windows to be wet on the inside?

Condensation on the interior of windows and doors occurs when warm, humid air comes into contact with cool glass. This is especially common in the winter when outside air is cold and dry, and the indoor air is warm and humid.

Why is there a puddle of water on my window sill?

Common Causes of Window Leaks

This is a frequent issue in homes with poor insulation or high humidity levels. The condensation drips down and collects on the sill, giving the appearance of a leak. While it might not indicate a structural issue, it can lead to mold growth or damage if not addressed.

What does a weep hole look like?

Weep holes are usually located at the base of brick exterior walls. They appear to be vertical gaps in the mortar joints between the bricks. Water may seep through the surface and enter the wall's interior because brick masonry is porous.

Can bugs get in through window weep holes?

These important holes are vital for the moisture management of a building but they provide pests with a wide open door into your home. Pests such as cockroaches and mice can use them to enter your home where they can cause damage and create an unsanitary environment.

What can I use to fill weep holes?

While you should never fill weep holes with solid material—such as caulk, wood, or mortar—you can put strips of fiberglass screen wire or a scouring pad in the weep holes to keep insects out.

What does a weep hole look like on a window?

Weep holes in windows are small openings usually located at the bottom of window frames. They act as drainage channels and help prevent water pooling in hidden areas which can cause damage.

How do you maintain weep holes?

Gentle Cleaning: Use a soft brush or a toothbrush to gently remove debris from the weep holes. Be careful not to damage the surrounding materials. Clearing Pathways: Ensure that the weep holes are not obstructed by caulk, paint, or any other substances.

Why does my window track fill with water?

Does water accumulate in your window track? It is normal to see a bit of water in your window track during heavy rain or when washing your windows and doors. However, it may also be an indication that it's time to inspect and clean your window's track and weeping holes.

Previous article
What eats away calcium buildup?
Next article
Why are mini splits not popular?