The Wisconsin Building Commission approved a request by the Department of Administration for roughly $1.9 million to repair the dome in the state Capitol Wednesday.
In their request, the DOA said moisture in the dome's interstitial space is causing rust to form on the steel trusses supporting the dome, which could be dangerous for the building's structure.
Structural failure of any one truss connection or the tension ring would have catastrophic results,"" the request reads.
According to a 2008 study of the dome's moisture, high humidity in the dome also contributes to the corrosion of the trusses.
The project is to include installation of a dehumidification system in the interstitial space in the dome and sealant at the base of the exterior dome, as well as inspection for any additional damage caused by leakage from the roof of the dome.
A 2003 inspection first found evidence of moisture, and in 2004 inspectors found rust on the dome.
The request was made by the DOA after the Dome Moisture Study was completed in September.
The study indicated several factors contributing to the damage, including the fact that the Capitol is now air-conditioned, causing differences in moisture levels inside and outside the dome during summer months.
According to the request, an additional request will be made for ongoing monitoring of the dehumidification system over five years.
