Jonathan Fernandez is overseeing the project at Liverpool Street.
“The panels here with lichen on them, it makes the station very, very dark indeed,” he said.
He added that the panels had become very brittle, were past their useful life and had “become a fragility risk especially with all the storms that we now have”.
“With the concourse roof they are actually glass panels, so where we have got fractures in the glass we are getting leaks which is causing water to get in on the concourse and causing slip hazards. And we can’t afford those cracks to get worse and pose a risk to the public,” he added.
Huge cherry pickers will be brought on to the concourse to enable removal of the glass panels. That means the concourse has to be shut.