Gap in sound insulation ?

I think I'll go with the sound proof mastic sealant suggested here, as opposed to expansion foam that I was initially suggested, which I think would do more damage than good.
 
foxhole said:
Small air gap will have little impact when most of the sound will be transmitted directly thru timbers .
Click to expand...
An air gap all the way through a floor between dwellings will have more than a little impact on sound transmission:!:
 
A 25 mm square hole will allow 15db extra sound through.
Or a 1mm crack 1metre long
 
Surly the acoustic slabs between the floor joists would eliminate light and sound?
 
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