What Is a Cove Joint?

A cove joint is the junction where your basement floor meets the foundation walls. This area is common for water seepage. Here is how cove joints are formed during your home’s construction:

• Professionals pour and cure a concrete footer.
• Walls are built on top of the cured footing.
• The basement floor is poured on the base, adjoining the walls.

Cove joint formation occurs when fresh concrete does not adhere to the previously cured concrete. This causes the footing and walls to form as separate elements rather than one cohesive unit.

When it rains, the soil around the foundation walls and under the basement becomes saturated with water. As moisture levels rise, increased pressure against the foundation occurs, causing water seepage through basement cove joints.

Moisture infiltration and water seepage can damage your home, so it is crucial to repair leaks promptly. While many waterproofing companies recommend sealing cove joints, expert builders discourage it for several reasons. Sealing is a temporary fix that does not address the underlying problem. Here’s why:

• Hydrostatic pressure needs an outlet: Sealing the cove joint traps water pressure. If the water cannot escape, it accumulates and causes cracks and foundation damage.
• Sealant Deteriorates: Even high-quality sealant degrades with water exposure and pressure, allowing water to seep through.
• False sense of security: Relying on sealant alone may lead to a false sense of security, causing homeowners to neglect to monitor cove joints for cracks or leaks.
• Water seeks entry: Hydrostatic pressure forces water to find entry points. If the cove joint is sealed but other foundation weaknesses exist, water will find another way in.

Resolving cove joint seepage involves alleviating hydrostatic pressure and redirecting water from the basement. One of the most effective methods is installing an interior drainage system.

Interior Drainage Systems

Basement waterproofing experts install interior drainage systems by drilling weep holes in the bottom course of the walls to alleviate pressure and allow water to escape.

They then place a specially designed perforated pipe in trenches excavated around the basement’s perimeter.

The drainage channels connect to a sump pump, which collects the water and directs it away from the home, preventing it from entering through the cove joint.