How much insulation
In a residential or non fire rated ceiling the cavity should be a minimum of 80% filled for optimum acoustical performance. The recomendation is always to fill the cavity full. This gives the opportunity for the very best noise control possible. There is no better, easier, or less expensive time to fill the cavity with insulation then before the gypsum board is installed.
In a multi family, or commercial fire rated ceiling follow the guidelines set forth in the UL design you have chosen for your project.
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