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Weight of Soundproof Plasterboard on Garage Ceiling

Postby a_peach7890 » Thu Aug 22, 2019 2:55 pm

I’m building a soundproof room in a garage for a friend, after having done it 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 the middle. The joists in the garage are similar to this:
5F1FAC94-4C7D-460F-952F-5F4C39A8EEED.jpeg (31.2 KiB) Viewed 304 times
Would that be too much mass for the joists, or would it be okay?
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