Insufficient sound insulation in walls separating adjacent rooms is a common problem that disrupts acoustic comfort in buildings, especially in residential premises. Partition walls are usually made of low-density, low-thickness and low-mass materials. These are partitions characterised by a good thermal insulation value but a relatively low acoustic insulation. In order to reduce the intensity of sound entering the room and increase the acoustic insulation of the partition itself, it is necessary to perform additional acoustic modifications.

One of the possible solutions is to improve the acoustic materials in the drywall system. Such changes require the use of a frame structure creating an air gap, to which the K-FLEX K-FONIK GK material is attached, and the lining is finished with plasterboard. Profiles should ideally be fixed to the floor and ceiling whilst avoiding fixing it to an insulated wall. These profiles should be physically separated from the structure of the room, e.g. with K-FLEX K-FONIK GK expansion strips (3) so that they do not transmit vibrations and sound transmission. The spacing of the profiles (4) should not exceed 40 cm. These modifications require the use of an absorbing material, e.g. K-FLEX K-FONIK 240 with a thickness of 20-30 mm (5). This configuration ensures high performance acoustic insulation thanks to the use of the principle of ‘mass - spring – mass’, consisting of placing an absorbing material between two masses (base wall and cardboard - gypsum with K-FLEX K-FONIK GK). In this way, the sound wave passes through centers characterised by a variable density, which has a positive effect on the process of its attenuation. In addition, the air void creates a resonant system that allows the absorption of sounds in the low frequency bands.