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Hi Whale, your suggestion that a minimum Ln,W+C1 acoustic underlay in laboratory performance test of dB 50 would permit a number of materials to be used in place of carpet but in our case the by-law was set at db 40 and only carpet or a floating floor with the best available underlay has been shown to deliver this standard in laboratory test results.
But this still doesn't change the fact that each situation is different and that noise transfer particularly impact noise in ground floor units is materially less than in units above. Therefore any reasonable noise transferance by-law should allow for this in respect of ground floor units.