They show that the noise levels in most clerical offices were well up to, and usually exceeded, the Wilson Reporta#39;s ... The sound reduction value of a 4 inch brick wall plastered both sides is about 45 dB ; 41 a very high standard for a demountable 20 63 125 250 500 1000 2000 1000 8000 FREQUENCY ... On basis of table 6: maximum speech interference levels, in: Council for Codes of Practice; British Standards ... T. A: The glass curtain wall: Fire resistance and sound transmission.
|Author||:||University of Liverpool. Pilkington Research Unit, Peter Manning|
|Publisher||:||Department of Building Science, University of Liverpool - 1965|