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Flint, I've also heard that uneven wall lengths helps and so does having no wall that is a multiple of another.
Thanks for the link, Feet. STC 60 would definitely do the job.
I got advice from a Filipino guy. He said that he built his sound-deadening building so that each wall is two layers of cinder blocks with a three-inch sand-filled space in between.
I can't imagine running power into a building like that, or ventilating smoke or other gases.
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