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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?
you want the floor joist 12-14" apart from each other (gear is heavy). take 5 gal paint buckets and halfway fill them with sand, place them under the stage. take pieces of shag carpet and go across the floor joist under the stage and they need to be wide enough to touch the ground.
I would make the stage at least 1.5" thick. 2.5" if you can.
Be sure to put a layer of glue between the layers.
Don't use cheap plywood. A base of MDF (for density) with good plywood (for strength) on top of that.
I think the opposite....BOND the 2x12's to the concrete with a
bead of construction or polyurethane adhesive. Using glue under the
subfloor is a good idea, with screws every 12" seems good. I don't
know the joist spacing, but 3/4" minimum subfloor I would think.
I don't think any fiberglass would be needed if you close the ends
and front off. If you bond it to the slab, it'll be super solid, I
doubt if resonances would be a problem.
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