Concealed damage the ceiling to the floor, or the lack of assessment of impact sound?

Based on the complaints of users apartments was found essential, mainly relating to ceilings to the floor, at which the top layer consists of laminated . Although these structures conform in terms of impact sound , residents have repeatedly complained about the poor acoustic comfort especially in the perception of movement across the floor in a higher floor. Spectral analysis of the noise source (the movement of persons roof construction with floor) were found to be the source of significant noise components in the low frequency range (31,5 to 40) Hz , that is outside the area of impact sound insulation rating per local legislation