finishing a basement ceiling

So SWMBO wants part of the basement drywalled.
I'm not sure how to handle the ceiling. I would like to glue & screw drywall right to the bottom of the joists to try and help stiffen the floor/trampoline above (2x8s, 12" O.C., ~14' span). My concern is that the drywall combined with the plywood and oak flooring above will act as a drum and make my noisy house even noiser.
I've briefly read about the metal rails you can screw to the joists to help cut down on sound transmission but I doubt they would provide much in the way of stiffening the joists.
Thoughts?
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I don't think drywall will stiffen anything that much either. Sistering the joists might help, or bolting steel to them.
nate
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Limp Arbor wrote:

    I can't say about the rest of the house, but it will be resonating in the basement. If it were mine, I would use acoustical tiles. They dampen noise and allow access to any plumbing or electrical run in the area between the floor joists.

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Drywall isn't going to do anything material to keep the joists from flexing. And if they do flex, the drywall joints may crack. If there is room, I'd go with a suspended ceiling so there is easy access for future repairs, running new cable, etc.
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address tghe structural issue FIRST.
I would get a engineer to look at why the bounce.
Drywall wouldnt do anything to help:(
Once the bounce is gone you can foam or use acoustical insulation with sound deadening drywall susspended on the track system.
But fix the structure FIRST!
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One should figure out how to stiffen. I pushed up some joists nailing 5/8 OSB plywood cut to size, on one side. Then for soundproofing, use Safe&Sound, firestop and sound mineral insulation. Sound deadening requires a thick mass.
Greg
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