BS4142 1997 Method for Rating Industrial Noise

Industrial Noise Affecting Mixed Residential and Industrial Areas

BS4142 is used to support planning applications for the introduction of industrial type noise sources into residential areas. BS4142 is used to ensure that the existing background noise levels in a residential area are not exceeded due to the introduction of industrial/commercial equipment. This noise assessment can be required in order to install air conditioning units, ventilation equipment, water pumps and any other type of mechanical plant which may give rise to noise complaints.

A BS4142 noise assessment compares the noise source in question with the existing background noise levels at the nearest sensitive residential building. The background noise is normally measured at the residential building for a period of 24 hours such to assess the day and night time background noise levels. The source noise levels can then be carefully assessed against these background noise levels by following BS4142 guidance.

Following analysis and the application of distance corrections and other factors to the data in accordance with BS4142, the difference between the source and existing noise level is determined. A difference of +10dB is a positive indication that complaints are likely. A difference of +5dB is said to be of marginal significance. A difference of -10dB is a positive indication that complaints are unlikely.

Mach Testing have carried out a wide variety of noise surveys based on BS4142 requirements. We have a good understanding of plant installations and have the necessary experience to select intelligent microphone location in order to accurately assess the effects plant noise. Mach Testing also have vast experience in selecting and designing noise prevention methods including acoustic noise enclosures and noise barriers in order to comply with BS4142.