“Flanking” is a misunderstood and under-appreciated problem in noise control construction design. It occurs when noise becomes structure-borne and finds a route around an isolated surface, called a “flanking path.”

Feb 19, 2021 · There are two complementary principles of soundproofing – flanking and workmanship. 1% Rule: “Flanking” is the process of sound bypassing the partition through its path of least resistance. The 1% rule declares that a 1% opening in a partition will allow 50% of the sound to pass through.

Building noise control - flanking pathways: this article explains how sound flanking paths, sound leaks around and through building components, defeats incomplete attempts to reduce building sound transmission and noise levels.

Care must be taken to avoid penetrations that align on both sides of the partition, creating a noise flanking path or “leak” through the partition.

Aug 18, 2015 · The results show that wideband ceiling attenuation class (CAC) decreases by 10 decibels (dB) and 1/3 octave band normalized ceiling attenuation (Dn,c) decreases by 15 to 22 dB in the higher frequency bands when common noise flanking paths are introduced into a ceiling system with CAC-37 ceiling panels.

CAC measures the noise reduction between two adjacent rooms by accounting for the sound path through the ceiling and common overhead plenum. The purpose of air transfer silencers is to ensure that any air transfer openings are not noise flanking paths—this is often the weak link that reduces noise isolation performance.

more specifically puts requirements on flanking walls specifically related to their mass. In this chapter, flanking sound transmission between two rooms via the building construction (flanking walls) will be treated.

A series of five CAC tests was performed by NGC Testing Services. The first ceiling system tested had no additional noise flanking paths; the suspension grid was filled only with ceiling panels. After this baseline test, each of three noise flanking paths (i.e., lights, supply air system and return air grilles) was tested independently. Finally ...

Controlling flanking path noise through the ceiling system is not typically part of a ceiling contractor's daily routine, so there is also an increased risk of failure. Lastly, once the building is occupied, flanking noise control measures above the …

Effects of noise flanking paths on Ceiling Attenuation Class (CAC) ratings of ceiling systems and inter-room speech privacy