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I’m building a soundproof room in a garage for a friend, after having done something similar for myself, but am not sure about the ceiling. I was planning to use two layers of acoustic plasterboard (roughly 40kg per 2.4x1.2m), with rock wool in between the joists. The joists in the garage look like this:

joists

Would that be too much mass for the joists, or would it be okay?

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    Hello, and welcome to Home Improvement. Without more info, the answer is going to be "it depends"; could you add a diagram, with the dimensions of the ceiling area to be soundproofed? And, you should probably take our tour so you'll know how best to participate here. – Daniel Griscom Aug 24 at 1:37

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