I've been asked to build a stage in a performance studio for a local music school. The stage will about 10'x20' and be constructed with a 2x12 joist frame over a concrete floor. It will have either a laminate wood or carpeted surface on the top. Instruments on the stage will consist of a grand piano, drum set, bass amp, etc.
I am concerned about the boominess of a large empty box. Any recommendations on filling the joist cavities? Will fiberglass batts be sufficient? Should I place something between the joists and the concrete floor to help isolate it?
If I fill the joist cavities with fiberglass batts, should I leave the front open to act as a bass trap for the room?
Jim D.
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