finishing a basement ceiling

[Limp Arbor]

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?

[N8N]

I don't think drywall will stiffen anything that much either. Sistering the joists might help, or bolting steel to them.

nate

[Ken]

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.

[trader4]

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.

[bob haller]

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!

[zek]

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