Lincoln Pool Leak Repairs

What Is Polyurea and Why Does It Matter

Polyurea is a waterproofing material sprayed onto concrete to protect it from water damage. Think of it like a raincoat for the pool's floor and walls. Without proper application, water seeps through cracks in the concrete — causing leaks and further damage over time.

Investigators found that the Lincoln Memorial reflecting pool did not get the attention it needed during the polyurea application process. That failure is now showing up as visible cracks and leaks in one of the most visited landmarks in the country, KOCO reported.

1 source

Two Specific Flaws Found by Investigators

The Hearst National Investigative Unit pinpointed two main problem areas. The first is called a "tie-in detail" problem. This happens where one day's spray work meets the next day's work. If those seams are not done correctly, the seal breaks down and water gets through.

The second problem involves the pool's expansion joints. These joints are built into the concrete to allow it to expand and contract with temperature changes. Investigators found that workers sprayed polyurea directly over these joints — sealing them shut. That can cause the concrete to crack and leak as it moves, WGAL reported.

1 source

Contractor Has Not Answered Key Questions

The company responsible for applying the waterproofing has not explained what went wrong. According to WLKY, the contractor did not respond to requests for clarification from investigators. That silence has raised more questions about oversight and quality control on such a high-profile national landmark.

1 source

Pool to Be Drained for Post-July 4th Repairs

Officials plan to drain the reflecting pool for repairs after the July 4th holiday. The pool stretches nearly 2,000 feet between the Lincoln Memorial and the Washington Monument. It is one of the most photographed sites on the National Mall and draws millions of visitors each year.

The timing of the drain suggests officials want to keep the pool open for the busy Independence Day weekend before shutting it down for work. How long repairs will take — and what they will cost — has not yet been made public, WCVB reported.

1 source