Skip to Main Content

What Are Weep Holes?: An Important Step in Basement Waterproofing

weep hole drilled and spewing water

When it comes to foundations, water damage is common. A flooded basement gives every homeowner a headache, but not all water damage is obvious. Even increased humidity levels in your basement can lead to various problems such as wood rot and mold growth. While rot can eventually compromise the stability of your home, airborne mold spores can contaminate the air you breathe and cause health problems.  

It is quite clear that keeping your home safe from water damage is a step in the right direction. But how can you achieve this goal? With waterproofing solutions, of course. Although most homeowners have heard about sump pumps that can quickly drain large volumes of water from the basement and encapsulation that ensures a clean and dry crawl space, not many have heard about weep holes. Nevertheless, these can be a valuable addition to your waterproofing system and help you ensure the health of your foundation. So, let’s take a closer look at them and their purpose. 

What Are Weep Holes? 

weep hole being drilled in basement

If just the thought of water collecting behind your foundation walls and slowly causing damage makes your stomach turn, it is great that you are getting ahead of this problem. This issue can quickly escalate, causing structural damage and a whole array of moisture issues in your home. Luckily, with weep holes, you can solve this problem. So, what exactly are weep holes? These holes are drilled into your foundation walls and their purpose is to drain the water that has infiltrated them. Water exits through the weep holes, alleviating the pressure on your foundation walls. The excess water then flows into the drainage system. Weep holes must be sized correctly so they can overcome surface tension. 

Should I Drill Weep Holes? 

weep hole leaking water

Now that you know what weep holes are, you are probably wondering whether you should install them. To answer this question, you should find out what type of foundation walls your home has. If they are built from concrete masonry units (CMU blocks) you should consider installing these holes. These blocks can make sturdy walls and bear a lot of weight, but they contain hollow cells. When water infiltrates the wall, it fills in these cavities and increases the hydrostatic pressure. Due to this force water eventually leaks into the basement and causes damage. Of course, you probably won’t be able to completely eliminate hydrostatic pressure, but there are ways to keep it under control. With weep holes, you can efficiently drain water from the CMU blocks and lower the pressure on the walls. This water will enter your drain system, flow into the sump pump pit and finally leave your home. 

Are you considering turning your basement into a comfortable living space? If so, you could benefit from these holes. Make sure you have these holes drilled before you finish your basement and while installing an interior drainage system in your basement. 

Perks of Weep Holes 

Weep holes on their own are not enough to keep your basement safe from any kind of water damage. However, when combined with other waterproofing solutions, they make a strong line of defense against this type of damage. With weep holes in place, water can quickly exit your walls before getting a chance to cause damage.  

Weep Hole Installation 

Weep holes are drilled at the bottom of the wall. After they are in place, they will be able to efficiently remove water from your foundation walls and direct it into the interior drainage system.  

The AquaStop interior drainage system collects all the excess water that seeps in through the walls and the wall/floor joint, as well as the water that comes out of the weep holes. It is barely visible once installed so it won’t disrupt the look of a finished basement. The AquaStop system features a clog-free design, so it won’t get clogged with debris and dirt. Another benefit is that it is made of rugged plastic, so it won’t rust or decay. 

Weep holes are a rather simple solution, but very effective. With weep holes you can relieve pressure on your foundation walls and avert a lot of problems.  

If you think that adding weep holes to your list of waterproofing solutions would benefit your Michigan home, do not install them on your own. Instead, let the professionals handle this project. Contact experts at FSM and schedule a free inspection and quote

Weep Hole FAQs

Typically, standard homeowner’s insurance does not cover basement waterproofing or seepage, but separate flood insurance might cover some water damage. 

Yes, effective waterproofing can enhance property value by protecting the structural integrity of the home and providing a healthier living environment. 

Look for a company with certified professionals, good reviews, a solid track record, transparency in pricing, and warranties on their work. Always ask for references and verify their credentials.

Leah Leitow

Leah Leitow

Content Writer

Leah is a Content Writer for Groundworks with nearly ten years of experience working in the foundation repair industry. Her experience ranges from working with homeowners to find the right solution to training inspectors and staff. In her background as a Michigan journalist, she gained invaluable insight into people's lives throughout our state. Leah lives in metro Detroit with her husband and two sons.

Publish Date:

Last Modified Date:

DryMich Service Map

Our Locations

Grand Rapids Office

5985 Clay Avenue SW
Grand Rapids, MI 49548

Livonia Headquarters

32985 Schoolcraft Road
Livonia, MI 48150

Rochester Hills

2817 Bond St.
Rochester Hills, MI  48309

Toledo Office

5555 Airport Hwy
Toledo, OH 43615

Traverse City Office

3805 Elmers Industrial Drive
Traverse City, MI 49685