125 mm partition wall on a single IntraProfil ® CW75 steel structure with 2 layers of 12.5 mm fire- rated gypsum plasterboard GKF(DF)/GKFI(DFH2) on each side of the partition. Sound insulation with 40 mm stone wool (min. 40 kg/m3, melting point >1000°C) Rw= 55 dB. Recessed base with 1 x 12 mm Promatect H with max. 400 mm height and overlap of min. 200 mm.