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.
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.
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.
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!
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.
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