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Better Blocking (STC 45) – Plenum Barrier (Preferred)

Research conducted by ROCKFON and NGC Testing Services1 shows that a lightweight plenum barrier positioned vertically above the wall, blocking the plenum, can provide a STC/CAC 45 level of blocking when combined with a stone wool ceiling system. This option can decrease the cost of the ceiling, allow for greater aesthetic flexibility and prevent the need to control noise leaks through the ceiling system. The plenum barrier should be installed with care ensuring no large openings while taping or caulking small openings, gaps and cracks.

Better Blocking (STC 45) – Plenum Barrier (Preferred) Image

PLENUM BARRIER

CEILING GRID DETAILS

CEILING SYSTEM

WALL ASSEMBLY