replying to kbmcdowell, Josef wrote:
All it takes is for one element of a sound transmission prevention project to
be overlooked and the effectiveness of all the other elements are diminished.
This is evident when what was done so far does not reduce the sound
transmission.
It is similiar to the total package that is the building thermal insulation
and building envelope that can be defeated by an opening that allows
infiltration and ex filtration. Just an eighth inch gap left open is enough to
defeat the project.
It is more than just bats of insulation, it is the whole system.


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