Nowadays, slop roof consists of steel column and beam or steel truss and purling, and connected with existed building by concrete beam cast in place, is being used commonly in this project.
In the shattered wreckage of Charlie Helicarrier's server interface dome, Steve Rogers used all of his strength to lift a fallen steel beam off Bucky Barnes.
This is more than enough time to evacuate most buildings, and once the smoke has settled, charred panels can be swapped out — unlike melted steel beams.