210 mm thick partition composed by 2 x 15 mm thick Pregyfeu BA15 on each side, fixed to galvanized steel frame made of 150 mm horizontal U tracks (40-150-40 mm at the bottom and 100-150-100 mm x 2 mm thick at the top) and 47-149-50 mm vertical C studs. According to fire classification report, 3 mm gap per meter height must be ensured at the top of the partition.