135 mm thick partition composed by 1 x 15 mm thick PregyPlac BA15 as inner layer and 1 x 15 mm thick LaDura Plus BA15 as outer layer on each side, fixed to galvanized steel frame made of 40-75-40 mm horizontal U tracks and 47-74-50 mm vertical C studs. Mineral wool 60 mm thick in the cavity.According to fire classification report, glass wool 45 mm thick, 12 kg/m³, is permitted as insulation.