A soil and waste pipe solution which minimises noise transmitted through the pipe. This is possible due to a perfect balance of pipe and fitting weight, fitting geometry and use of recommended bracketry during installation, creating outstanding acoustic properties.
When installing internal pipework in high rise apartment or multioccupancy buildings, the use of acoustic drainage is essential to ensure tenants are not disturbed by the sound of running water or vibrations from the pipes. Here, Franz Huelle, Head of Technical for Building Solutions at REHAU explains more about the issues of noisy drainage, options for acoustic drainage pipework and how it can offer major benefits for installers and end users alike:
Building Acoustics - Science of controlling noise in buildings. This includes the minimisation of noise transmission from one space to another and the control of the characteristics of sound within spaces themselves.
Noise - A sound, especially one that is loud or unpleasant or that causes disturbance.
Sound - Any pressure variation that travels through the air or another medium and can be heard when they reach a person's or animal's ear.
Sound pressure - This is what we hear.. it is the difference between the pressure caused by the sound wave and the ambient pressure of the medium the sound wave is passing through.
Sound Pressure Level (SPL) - Used with the unit DeciBel, it describes the logarithmic ratio of the effective sound pressure to the reference sound pressure of 0.00002 Pascals.
Decibels - Unit based on a logarithmic scale used for the ratio of measured effective sound pressure or sound intensity to a reference value in acoustics, electronics and communications.
Vibration - is an oscillation of a fluid or solid whose equilibrium has been disturbed
Frequency - is the number of times a vibration occurs or repeats itself every second
Reverberation Time - Is the time it takes for the sound pressure level to fall by 60dB after the sound source has been turned off.
Loudness - the subjective perception of sound pressure and can be ordered on a scale from quiet to loud
Structure-borne noise - Sound that reaches the point of interest predominately via a solid structure
Airborne noise - Sound that reaches the point of interest through air
The ear has the remarkable ability to handle an enormous range of sound pressures.
In order to express levels of sound meaningfully in numbers that are more manageable, a logarithmic scale is used, rather than a linear one - the deciBel scale.
The scale covers 13 orders of magnitude - from the thickness of a single hair to a 30 storey tower!
0dB SPL is the quietest sound audible to a healthy human ear = 0.00002Pa SP
Negative dB SPL are possible