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Is it better to put QuietRock on both sides of the party wall or just one side?

Depending on the wall type and level of sound reduction (STC rating), you wish to achieve, QuietRock can be installed on one or both sides of a wall. In most cases and applications, installing QuietRock on only one side of a wall is all that is necessary to see noticeable and significant reductions in sound transmission through the wall (assuming the wall is well sealed with acoustical sealant-QuietSeal Pro and QuietPutty is used on the electrical outlet boxes and that the sound cannot “flank” or go around the wall). Refer to our QuietRock assembly guide for more information on performance differences using QuietRock on one or both sides of different wall types.