Flanking

In all situations where sound insulation is important the transmission of sound by secondary or flanking paths should be considered. This is especially true when high-performance partitions (STC/R_w 55 or greater) are to be used.

INSUL does not directly calculate the flanking transmission within a building. Rather, INSUL provides a visual indicator of the level of flanking transmission that might be experienced in a typical building, as a reminder that flanking transmission must be considered, or special measures taken to reduce flanking, in order to achieve high sound insulation between spaces.

See Flanking Transmission for a fuller discussion.