Richard Rogers partnership specified some 2.5 million sq. ft. of Kalzip 65/400 stucco-embossed aluminum panels for its design of a new main terminal at Madrid's Barajas Airport. The building is comprised of 240 modules, each measuring 29-1/2’ wide by 246’ long. The roof of each module arches in opposite directions, similar to the wings of a bird, leading to aircraft gates at the opposite tip. Kalzip panels, some of which are tapered, were laid lengthways and curved into a complex shape. The decking below was formed from pre-curved perforated aluminum panels, followed by a double layer of slab insulation. The composite assembly is said to provide outstanding acoustical performance, protecting passengers and terminal workers from aircraft noise outside.