A basement leaking is a common problem for homeowners, especially during heavy rain, spring thaw, and periods of changing groundwater levels. Water can enter a basement for several reasons, including cracked foundation walls, damaged weeping tile, clogged or inadequate drainage, hydrostatic pressure, and poor grading around the foundation.

When water isn’t properly directed away from your home, it can build up against the foundation and eventually find its way through cracks, joints, window wells, or other weak points. In some cases, basement leaks can also be caused by failing waterproofing or drainage systems that are no longer functioning properly.

At Horizon Contracting, we identify the source of the water and recommend the appropriate solution, whether that involves foundation repair, exterior waterproofing, drainage improvements, weeping tile replacement, excavation, or leak repair. Addressing the underlying cause—not just the visible water—helps protect your basement and prevent recurring problems.

Common Causes for Basement Leaking

Clogged Gutters

If gutters are clogged, they can overflow, directing rainwater toward the house’s foundation and making it more susceptible to leaks. Ensuring gutters are clean and clear can reduce the risk of leakage or misdirected drainage.

Poor Exterior Drainage

If the ground slopes toward your house, water can pool around the foundation. Soil will settle over time, causing this slope to worsen and allowing water to seep through the floors or walls during heavy precipitation. Ensuring a slope of at least 1 inch per foot away from your house for the first 6 feet will help prevent these leaks.

Cracks in Floors or Walls

Over time, concrete floors and walls can develop cracks due to shrinkage, hydrostatic pressure and settling. These cracks will allow water to seep through, especially during heavy rainfall. 

Hydrostatic Pressure

When the soil around the house’s foundation gets wet, the pressure can force the water through weak points. Checking for cracks or weak areas in the floor or walls can prevent leaks caused by intense soil saturation.

References:

Hydrostatic Pressure – Fluids – MCAT Content

French drains, trench drains and weeping tiles – Canada.ca

GUTTER Definition & Meaning – Merriam-Webster

Window Wells | How They Work, Maintenance, and More | Square One