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Sound Transmission Through Concrete Masonry Walls
Concrete masonry units (concrete blocks) are usually sufficiently heavy that walls constructed from them provide STC ratings of about 45 to 55 simply by sealing the block surface.
Adding materials such as sand or grout to the cores of the masonry units makes them perform much like solid blocks; an increase in transmission loss results due to the increase in weight.
Finishing the walls by adding gypsum board on furring or studs creates a more complicated system where resonances can greatly increase or decrease the sound transmission loss. Several reports and papers resulted from a joint project with the Ontario Concrete Block Assocation. These describe the major factors that determine the sound transmission loss and give measured data for many different wall systems.
