Q.: Are there any data to show a prospective customer that concrete walls are effective in deadening the sound between two adjacent rooms?

A.: Because of their mass, concrete walls are excellent for this purpose. Most codes say the sound transmission coefficient should be 45 or more (the higher the value the quieter). An unfinished concrete wall 6 inches thick has a sound transmission coefficient of about 57; finished walls have slightly higher values. Further data are given in "Deadening of Air-borne Sound in Partition Walls," published in our June 1979 issue, page 375.