Red Line closures between Friendship Heights and Grosvenor begin July 15

- Major disruptions will be coming to the Red Line as Metro crews have started to test a new waterproofing system.

The Red Line will run single track ever weeknight beginning at 9 p.m. between Grosvenor and Friendship Heights until Aug. 6. The Metro will be completely shut down between those stations every weekend during that time starting on Saturday.

During the weekend closures, buses will replace trains along the Red Line between Grosvenor and Friendship Heights.

MORE: Major Metro Red Line service disruptions coming

The Metro will be testing a new waterproofing system known as curtain grouting, where grout will be injected through the tunnel ceiling in order to coat the outside of the tunnels with an impenetrable rubber-like membrane. 

Metro is only testing the technique between Friendship Heights and Medical Center, but if successful, they will implement curtain grouting along the entire 9-mile stretch of the Red Line that suffers from moisture and water dripping.

The technique has never been used on a transit system, but has been successfully used in the mining industry.

Metro will know if the system works in early 2018 and then will decide whether they will use curtain grouting along the entire Red Line.
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