R&D Report 1994-07 : Further measurements of the sound insulations of metal-framed partitions. G.D. Plumb The sound insulations were measured of a number of single and double leaf metal-framed partitions. The purpose of the work was to develop alternative designs for partitions to that of the Camden. The Camden contains fibreboard as one of its constituent elements. The new partitions used plasterboard as the sole board material. Therefore, the new partitions were heavier than the comparable metal- framed partitions. The levels of sound insulation achieved from the new partitions were generally slightly higher than those of comparable metal-framed Camdens. However, the greater masses of the new partitions may rule out their use in certain circumstances because of the loadbearing requirements of the surrounding building. The installation of glass wool insulation batts in the cavities of the new partitions resulted in large increases in the measured sound insulations. The glass wool damps the motion of the boards and absorbs sound that has been transmitted into the cavities.