Why does my window well keep filling with water when it rains?

The most common causes are improper grading that directs surface runoff toward the window well, a clogged or missing window well drain pipe, downspouts discharging too close to the well, or a missing window well cover. Often it's a combination of these factors working together.

How does a window well drain work?

A window well drain is a vertical pipe installed at the bottom of the window well that connects to the home's footing drain (perimeter drain tile) system. Water that enters the window well flows down through a gravel fill, enters the drain pipe, and is conveyed to the sump pit or a daylight outlet away from the foundation.

What type of gravel should I use in a window well?

Use clean, washed, angular crushed stone in the 3/4-inch to 1-inch size range. Avoid pea gravel, river rock, or unwashed quarry stone, as these compact more easily or contain fine particles that clog the drainage system over time.

Can I install a window well drain myself?

Basic maintenance like adding gravel, installing covers, and improving surface grading are DIY-friendly tasks. However, installing a drain pipe that connects to the footing drain system requires excavating to footing depth (often 7-8 feet), which typically requires professional equipment, safety shoring, and expertise.

Do window well covers prevent basement leaks?

Window well covers can reduce the volume of water entering a window well by 90% or more by shedding rain and snow. However, they don't address groundwater intrusion or surface runoff that flows under the cover edges, so they work best as part of a complete drainage system that includes a functional drain pipe and proper grading.

How often should I inspect my window well drains?

Inspect window wells at least twice a year—in spring after snowmelt and in fall before winter. Additionally, check them after any major storm that produces heavy rainfall. Test drainage by pouring 5 gallons of water into the well; it should drain within a few minutes.

Window Well Drainage: Stop Basement Window Leaks

Learn how to fix a window well filling with water and prevent basement leaks. Expert guide covers window well drain installation, grading, and waterproofing…

By Low Point Labs

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