KEY CHANGES TO BB93 THAT WILL AFFECT THE DESIGN OF SCHOOLS
In February 2015 updates to BB93 were published setting out minimum performance standards for the acoustics of school buildings.
What has changed?
- BB93 now only contains performance standards, with very little design guidance. Additional design guidance will be issued separately in due course by the Association of Noise Consultants (ANC) and the Institute of Acoustics (IOA).
- Performance standards have now been introduced for refurbished school buildings.
- The performance standards now apply to rooms with their normal furnishings instead of empty rooms. This is more representative of the situation that will exist when the school is operational, but does introduce uncertainty regarding the acoustic performance of the fixtures and fittings.
- There is a performance standard for rain noise on roofs. This means that polycarbonate roof lights and lightweight roofs are unlikely to be acceptable in teaching areas.
- The performance standards for indoor ambient noise levels have been clarified for different rates of ventilation for air quality and thermal comfort. In particular, there is a new upper noise limit of 55 dB(A) for external noise ingress when open windows are used to control overheating. This means that it will be possible to use openable windows to control overheating in schools in noisier areas than was possible under the previous version of BB93.
- Common situations that previously required Alternative Performance Standards (APSs) are identified, and pragmatic performance standards for these situations are given. These include:
- Doors connects teaching spaces
- Movable walls
- Vision panels between music rooms, multi-purpose halls and control rooms
- Serving hatches between kitchens and multi-purpose halls
- There was previously no guidance on how far APSs could deviate from the performance standards in BB93. The limit for APSs is now set at the performance levels for refurbished buildings.
- There are more requirements for pupils with special educational needs.
- The performance standards for reverberation levels in indoor sports halls has been relaxed for larger sports halls.
Here are some of our most recent BB93 projects
Battersea Exchange Mixed-Use Development with School
Campus Expansion – Fareham College
Primary Academy Phase 3 Extension
We are here to help…….
If you have any queries on the new document and how it may affect your projects – please do not hesitate to call us on 01234 834862.