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Best Blocking (STC 50) – Plenum Barrier

Research conducted by ROCKFON and NGC Testing Services1 shows that a lightweight plenum barrier made of stone wool insulation or gypsum board positioned vertically above the wall, blocking the plenum, can provide an STC/CAC 50 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.

USING STONE WOOL

More Plenum Barrier Options - Better Best Blocking - STC 45 50 - Plenum Barrier

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PLENUM BARRIER

CEILING SYSTEM

WALL ASSEMBLY

CONTINUOUS CEILING GRID DETAIL

Running the ceiling grid continuously over the tops of interior partitions is sometimes utilized so that future reconfiguration of the walls does not require replacement of the ceiling grid. In other cases, pre-manufactured demountable walls typically stop at the underside of the suspended ceiling. When the ceiling grid passes over the walls, install the double layer plenum barrier as shown in the detail below.

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USING GYPSUM BOARD

Best Blocking (STC 50) – Plenum Barrier Image

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PLENUM BARRIER

CEILING SYSTEM

WALL ASSEMBLY