The test series investigated if the thickness/weight of the plenum barrier could be decreased, if the foil facing could be eliminated, and if taping the vertical seams between plenum barrier panels could be eliminated.Ī series of sound-isolation tests was performed on a suspended, modular, acoustic ceiling system with and without various lightweight plenum barriers under laboratory conditions in a dual-room chamber. ![]() Secondly, the mission was to determine whether the plenum barriers could be simplified to decrease material cost or installation time. First, the objective was to test whether stone wool plenum barriers could achieve the high sound-isolation ratings that are required by acoustic standards. The goals of this most current phase of the research were twofold. This article focuses on stone wool plenum barriers due to their low cost, relatively quick installation, pliability, and high sound-isolation performance, but other materials may prove to be appropriate in some applications. While gypsum-board plenum barriers are just as cost-effective as stone wool plenum barriers and perform as well acoustically, the rigidity of the material can be a disadvantage in some buildings where there is floor/roof deflection, seismic joints, or expansion/contraction joints. Additionally, the MLV plenum barriers are more time-consuming to install. This article omits research done on MLV plenum barriers because they generally do not perform as well as stone wool insulation and gypsum-board plenum barriers further, plenum-rated MLV is much more costly than stone wool insulation and gypsum board.
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