Excessive noise levels are also associated with patterns of increased irritability and aggression and decreased cooperation, according to researchers at
the National Institute for Occupational Safety and Health.
The importance of acoustics and noise abatement to the quality of a buildings interior environment and to occupant comfort is also recognized by the
USGBC, with noise mitigation credits available in several LEED rating system tracks.
In correctional facilities, a host of verbal communications and physical activities interact with architectural and structural elements to create variable
degrees of environmental noise.
The noise associated with plumbing systems is generated by the transport of materials and system vibration as sound waves travel through the system
and pass through the pipe wall. A 2001 study by Canadian acoustical consultants MJM found cast iron soil pipe, when installed with rubber gasket
joints, proved 750 percent more effective in reducing plumbing noise than alternative plumbing materials, such as PVC and ABS pipes.
The MJM research study, which was sponsored by the American Cast Iron Soil Pipe Institute, compared the acoustical performance of various piping
material solutions under laboratory conditions at Quebecs Domtar Research Center. Hub and spigot cast iron pipe achieved vibration reductions up to
12 decibels per joint, while hubless pipe with elastrometric gaskets and stainless steel shields yielded reductions up to 9 decibels, according to study.
In addition to the cast iron systems across-joint vibration reduction, the dense molecular structure of the cast iron mitigates the transfer or
amplification of sound waves beyond the system. Cast iron pipe and fittings dampen the airborne noise produced by flowing water and inhibit noise
transfer through the pipe wall.
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