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Water will find its way into your basement in any way it can. Even if you seal off your concrete walls and install a perimeter drain, leaks can still occur through a variety of ways.

One of the most common ways that water floods a basement is through your basement windows. This article will walk you through why basement windows leak and a couple of steps that you can take to repair and prevent this problem.

Causes of Window Leaks

Basement windows are most often made out of steel or wood. As these materials age, they will begin to rust, corrode, and decay. Fortunately, basement window leaks can be fixed quickly, easily, and permanently by draining any leaking water into your perimeter drainage system.

leaking window well
The windows begin to hang loosely in their frame, and the frame begins to hang loosely in its opening in your basement wall

How to Fix Leaking Basement Windows

We fix leaking basement windows with the WellDuct® Basement Window System to redirect flooding to a perimeter drain or drywell. During installation, our technicians follow these four simple steps:

1) Install a Perimeter Drain or Drywell
At Thrasher, we recommend that water from your WellDuct® is directed into a French drain system. Otherwise, a small drywell can be created beneath the leaking window. If your problem is a leaking crack beneath your window, no hole will need to be created.

2) Create a Drainage Channel  
The installer will create a small hole in the wall just underneath the window. If you have block walls, a PVC pipe will be installed in this hole and a grated opening will be installed on the outside of the pipe to help prevent clogs. A polymer will be injected around the outer edge of the pipe to help keep it sealed and in place.

3) Direct Water Into Your Perimeter Drainage System
A gray plastic fitting will be placed on your inside basement wall, directing water down into your perimeter drain or drywell. The top of the drain will be sealed off with a polymer injection. Plastic pegs mechanically attach the plastic fitting to your walls.

4) Seal The Drain
The edges of the plastic fitting will be sealed to your wall with a polymer injection. Once the workplace is carefully cleaned, your installation is complete!