Also, the R-value of an 8" CMU block wall is about 1 (basically nothing). So the walls need to have basically the same insulation added for code as stick built. So 8" concrete block with intermittent concrete filling would almost definitely have more sound insulation than 2x4 or 2x6 with insulation and OSB or plywood sheathing. I would be if the stick built house meets sound insulation standards, the block wall far exceeds them.
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