- Published: May 12, 2025
Nico Barbieri
Nico was the first person hired for the position of estimator and project manager for our growing company. He has over 25 years of experience in the water proofing industry. More About Nico
Basement window wells are a common feature in Toronto homes—they let in light and provide emergency egress. But they also pose a serious risk if not properly waterproofed. In fact, leaky or poorly drained window wells are one of the leading causes of basement water intrusion.
At Aquatech Waterproofing, we specialize in fixing and preventing these hidden vulnerabilities. Here’s why waterproofing your window wells is a smart and essential investment.
1. They’re Below Grade—and Collect Water
By design, window wells sit below the soil level, meaning they naturally collect rainwater, melting snow, and runoff.
- Without drainage, water builds up quickly
- Hydrostatic pressure can force water through window seals and frames
Waterproofing Tip:
Install a proper window well drain connected to your exterior weeping tile or interior drainage system.
2. Old or Damaged Wells Can Collapse or Leak
Metal or plastic wells degrade over time, especially with soil pressure and weather cycles.
- Rust, cracks, or bending allow water to bypass the well entirely
- Water enters through gaps or foundation cracks nearby
Waterproofing Tip:
Upgrade to heavy-duty, rust-proof window wells and reseal the perimeter with waterproof coatings.
3. Improper Grading and Landscaping Adds Risk
Window wells often become accidental catch basins due to sloped soil or misplaced downspouts.
- Overflowing gutters or poorly positioned drainage can overwhelm them
- Even a small rain can lead to seepage without proper planning
Waterproofing Tip:
Ensure all landscaping slopes away from window wells. Extend downspouts 4–6 feet from the foundation.
4. Basement Windows Are a Weak Point for Moisture
Even well-installed windows can’t resist standing water indefinitely.
- Water can enter through sill joints, framing, or cracked panes
- Repeated moisture causes rot, mold, and air leaks
Waterproofing Tip:
Use double-sealed, energy-rated windows with exterior caulking. Apply waterproof membranes to vulnerable sill areas.
5. A Small Leak Can Become a Big Problem
Water that enters through a window well can lead to:
- Carpet and drywall damage
- Mold infestations
- Foundation weakening over time
Waterproofing Tip:
Consider both interior and exterior waterproofing around basement windows for complete protection.
Don’t Overlook the Importance of Window Well Protection
Your window wells may look harmless—but they can be a major source of basement flooding. Whether you’re dealing with a recurring leak or building new, Aquatech Waterproofing offers custom window well solutions that keep your home dry year-round.
