Acoustic Surveys

SEP are able to carry out all aspects of Acousting Testing & Surveying that your project requires, below is an example of the type of work needed on a new Design & Build School:-

Initial Baseline Noise Survey

An initial site visit would be carried out with all local noise sources noted.  The background noise and vibration (where required) at the site will be measured over a typical daytime weekday period, with the noise level compared against BB93 noise level requirements for a new school building:

“For new schools, 60dB LAeq,30min should be regarded as an upper limit for external noise at the boundary………..Under some circumstances it is possible to meet the specified indoors ambient noise levels on sites where external noise levels are as high as 70dB LAeq,30min” (Ref: BB93 Section 2)

Design of Internal Spaces

Section 1 of BB93 sets out a number of parameters which should be addressed in relation to the design of a new school building, these are:-

  • Reverberation Time. The internal reverberation time within teaching spaces should be controlled to ensure the teacher can be clearly heard by all students and does not need to excessively strain their voice.
  • Sound Insulation of Separating Partitions. Internal floors and walls should be constructed in such a way so as to reduce airborne and impact noise transfer between spaces, this has obvious benefits between confidential spaces, such as a classroom and a teachers office, however poor design could lead to a quiet classroom being disrupted by noise from an adjacent sports hall.
  • Internal Ambient Noise Level. The internal ambient noise level will be calculated from the initial baseline noise survey and from any other activities in the school, for example, external facades, ventilation and glazing will be specified to reduce noise break-in and internal glazing and doors can be specified to reduce noise from ancillary spaces and corridors to aid in reducing the noise within classrooms.
  • Rain Noise. Rain noise caused by rain falling onto the roof should be controlled to reduce disruption to students and teachers, although not a requirement of BB93, it is suggested that rain noise is considered.

Final Testing of Design

Once complete the school can be tested for compliance with BB93, the above parameters will be tested (except rain noise) with any areas falling short requiring remedial action.

Industrial Noise of School

Schools will typically require some heating or cooling plant to be installed, the noise from the plant should be assessed and addressed where necessary to ensure no local residents or other noise sensitive spaces are detrimentally affected