The City of Tacoma issued a request for proposals (RFP) this month seeking contractors to clean the Tacoma Dome’s roof.

One of the largest wood-domed structures in the world, the Dome’s 5-acre roof was built with 1.6 million board feet, according to the venue’s website, and weighs nearly 1.5 million pounds.

The Tacoma Dome opened in the spring of 1983, and it is owned by the City of Tacoma.

The facility recently underwent a $31 million renovation of areas of its interior and exterior. State-of-the-art seating was installed, backstage artists quarters and dressing rooms were built and include a suite of seven contemporary and comfortable rooms, restrooms were upgraded, more food and beverage locations were created, and new loading docks were built to better serve crews setting up and tearing down events.

In 2012, an anonymous donor paid $103,000 to clean the Tacoma Dome’s roof.

“It’s been six years since it was last cleaned,” Kim Bedier, director of Tacoma Venues & Events, told South Sound Business during an interview and tour of the Dome in April.

Cleaning the roof was tabled due to a massive, years-long construction project along Interstate 5, which runs just past the Dome, according to Bedier. The project is still underway, and it has created dust and dirt due to bridge demolitions and other roadwork activities.

“We are going to take a chance this summer and clean it,” Bedier added. “It’s about $150,000 to clean it. It’s a lot of acreage and we have to reclaim all of the water. It’s a big job.”

According to the RFP, the project includes the removal of accumulated dirt and other material adhering to the roof’s membrane, as well as the removal and disposal of waste and water from the cleaning operation. The contractor will also clean the louvers and walkway inside the Dome’s cupola. The project should be completed within 120 calendar days.

The RFP was issued on June 11. The deadline to submit proposals is June 25. More information is available online here.