Depending on how much work you are willing to do and what your budget will
bear, here is what I would consider doing. If ceiling joists are more than
16" on center cross brace the joists at 16" on center and use BC plywood.
Use 3/8 or thicker plywood and screw it up there. If the joists / cross
braces are 16" on center the ceiling will stay flat. Having a strong plywood
ceiling will allow you to screw things up there anywhere you want. For heavy
loads a molly bolt through the plywood will be very strong.
If you think sheetrock will be quieter attach it to the plywood and still
get all the plywood benefits.
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