Means the acoustical impact, for example by footsteps, in the adjoining room or the room underneath. A hard floor covering will reduce the sound impact much less than a soft floor covering as carpet. The ΔLw-value is given in decibel (dB). This gives the real number of decibels reduced by the flooring material. Carpet in general gives an impact sound reduction between 20 and 30 dB.
SoundMaster® offers an impact sound reduction value of minimal + 10 dB in addition to the standard sound impact value. To compare: other flooring solutions (excl. carpet) give a value between 5 and 10 dB. For more information download the DESSO SoundMaster® brochure here.