British Standard 4142

British Standard 4142 Methods for rating and assessing industrial and commercial sound

The 2014 version of British Standard 4142 (BS 4142) contains the commonly accepted method of assessing and rating noise impact from industrial and commercial developments on noise sensitive properties. The standard can be used to investigate complaints, assess proposals for new industrial and commercial developments and new residential developments adjacent to existing industrial and commercial uses.

industrial-dayBS 4142 requires the following work to be carried out to rate a noise. The background noise level (LA90) is measured at adjacent noise sensitive locations in the absence of the noise to be assessed. The background noise level is measured at an appropriate time to represent the noise level when the source to be assessed will be operating e.g. if the noise source is 24 hour operation, the background noise levels would be taken to represent the quietest period of the night.

The noise from the new source is then assessed at the noise sensitive premises. The specific noise level is predicted (or measured) at the nearest noise sensitive property in terms of LAeq. The specific noise level is assessed for the relevant time period, one hour during the day and fifteen minutes at night.

The rating level is then calculated by adding corrections to the specific noise if the noise is tonal, impulsive or irregular enough to attract attention.

The measured background level is then subtracted from the rating level. The Standard provides guidance on the difference between rating level and background noise level and the need to take in to account the context in which the sound occurs.

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Manchester 

Hepworth Acoustics Ltd (Head Office)
21 Little Peter Street
Manchester
M15 4PS

 

Tel: 0161 242 7900
Fax: 0161 235 8407

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Birmingham

Hepworth Acoustics Ltd
1310 Solihull Parkway
Birmingham Business Park
Birmingham
B37 7YB

Tel: 0121 635 5565
Fax: 0161 235 8407

London

Hepworth Acoustics Ltd
Hamilton House
Mabledon Place
London
WC1H 9BB
 

Tel: 0207 554 8712
Fax: 0161 235 8407

Liverpool

Hepworth Acoustics Ltd
Bulloch House
10, Rumford Place
Liverpool
L3 9DG
 

Tel: 0151 515 0741
Fax: 0161 235 8407

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Sheffield

Hepworth Acoustics Ltd
The Innovation Centre
217 Portobello
Sheffield
S1 4DP
 

Tel: 0114 224 2428
Fax: 0161 235 8407

Bristol

Hepworth Acoustics Ltd
1st Floor, Aztec Centre
Aztec West
Almondsbury
Bristol
BS32 4TD

Tel: 01454 203533
Fax: 0161 235 8407