On top of the metal frame, trapezoidal sheet, as a support to 6 cm concrete. The sheet itself has a 0,3 mm thickness, and can withstand a load of 450 kg/m2.

Over the concrete, PENETRON hydro insulation coating.

On top and below the metal frame, double layer of fire-resistant gypsum board, to protect the frame from fire.

Vapor barrier and air barrier membranes for air and water protection.