125 mm thick partition composed by 2 x 12,5 mm thick PregyFlam BA13 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. Glass wool 70 mm thick 12 kg/m³ in the cavity.According to fire classification report, glass wool with density between 12 and 17 kg/m³ and thickness between 30 and 70 mm is permitted as insulation.