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Why Basement Windows Leak


Terry Kobatskyi

Terry Kobatskyi

Terry is a reliable project manager with over 15 years in construction field, who has started his career of working in the trenches. Learn More About Terry Kobatskyi

One of the most common yet overlooked problems in home waterproofing is a leaky basement window. At Aquatech Waterproofing, we’ve encountered many homes in Toronto where this seemingly small issue has led to significant headaches for homeowners—making leaky basement window repair an essential service.

Identifying the Leak

The first step in addressing any leak is determining where and why it’s happening. Leaks around basement windows often occur due to improper sealing, clogged weeping systems, or windows that are old and have deteriorated over time. If you notice water stains, pooling water, or mold around your windows, it’s time to take action.

Why Basement Windows Leak

Basement windows can sit at or below ground level, making them susceptible to collecting rainwater or runoff. This can be caused by:

– Poor landscaping drainage

– Inadequate window well design

– Failure of the existing drainage system

How To Repair And Waterproof Leaky Basement Windows

1. Inspect and Clear Window Wells:

Ensure that your window wells are free of debris that could block drainage. Adding a layer of gravel at the bottom can help facilitate proper water flow away from the window.

2. Seal Gaps and Cracks:

Use a high-quality sealant to fill any gaps or cracks around the window frame on both the interior and exterior of the window. It’s a quick fix that can make a significant difference.

 3. Replace the Window:

If the windows are beyond repair due to age or extensive damage, replacing them with newer, more energy-efficient models is often the best long-term solution.

4. Install a Window Well Cover:

A robust window well cover can keep out rain, snow, and debris, significantly reducing the likelihood of leaks.

5. Ensure Proper Grading:

The ground around the basement windows should slope away from your home’s foundation, guiding water to drain safely elsewhere.

Why Is Proper Drainage Important?

Leaky windows can sometimes indicate an issue with your home’s overall drainage system. Aquatech Waterproofing can install weeping tiles and drainage systems to divert water away from your foundation, greatly reducing leaks.

Professional Basement Waterproofing Solutions

At Aquatech Waterproofing, we offer comprehensive exterior waterproofing services, including the installation of effective window well systems. Our expert team will ensure that your window wells are properly sealed and that they have adequate drainage to protect against leaks.

Importance of Expert Assessment

Each property has its unique challenges when it comes to waterproofing. Aquatech Waterproofing provides free consultations to help you understand the exact cause of your leaky basement windows and the best course of action to fix them.


Leaky basement windows can lead to bigger problems if not addressed quickly and correctly. By following these steps and seeking professional help from Aquatech Waterproofing, you can ensure that your basement stays dry and healthy. With over 25 years of experience, you can trust us to provide the right waterproofing solutions for your home in Toronto.