Last month, the roof at the new Falcons stadium successfully closed. Next month, it may stay that way for a while.

Via Tim Tucker of the Atlanta Journal-Constitution, AMB Group CEO Steve Cannon said Tuesday that the roof will be closed when the stadium opens next month, and that it will remain closed “for an undetermined period of time” thereafter. Cannon blamed the inability to fully mechanize the roof on construction delays.

As a result, Cannon said the roof will be closed both for the preseason home opener on August 26 and the regular-season home opener on September 17.

That conflicts with something Falcons president and CEO Rich McKay said in May on PFT Live. At the time, McKay said the roof will be fully operational from the moment the stadium opens.