Matthewsgreen Primary School and Community Facility Acoustics - Stage 3 Report
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Matthewsgreen Primary School and Community Facility Acoustics - Stage 3 Report For: Faithful + Gould Job No: 1014076 Doc Ref: 1014076-RPT-AS-001 Latest Revision: C Date: 17/02/2017 Cundall Johnston and Partners LLP One Carter Lane London EC4V 5ER Tel +44 (0)20 7438 1600 www.cundall.com 160 Matthewsgreen Primary School and Community Facility Stage 3 Report | March 2017 Project Name: Matthewsgreen Primary School and Community Facility Client: Faithful + Gould Report Title: Acoustics - Stage 3 Report Job Number: 1014076 Document Revision History Revision Issue Date Purpose of issue / description of revision Ref - 03/02/2017 Draft issue for comment A 10/02/2017 Updated following review B 16/02/2017 Updated following review C 17/02/2017 Updated following review Document Validation (latest issue) 17/02/2017 17/02/2017 17/02/2017 X X X Principal author Checked by Verified by Signed by: Lees, Alex Signed by: Hyden, Matthew Signed by: Turner, Rob Matthewsgreen Primary School and Community Facility – Acoustics – Stage 3 Report Document Ref - 1014076-RPT-AS-002 Rev - 161 Executive Summary This report outlines the acoustic design strategy for the proposed teaching block at Matthewsgreen Primary School and Community Facility, Wokingham. The purpose of this report is to stipulate acoustic performance requirements for the development which are in line with current regulations and codes of practice, in particular Building Bulletin 93 ‘Acoustic design of schools – performance standards’ (BB93). Acoustics-related planning conditions are also addressed within this report. Acoustic performance criteria are set out on the basis of relevant guidance and standards in relation to: Indoor ambient noise levels; Airborne and impact sound insulation; Reverberation time; and Services plant noise limits. With regards to achieving appropriate internal ambient noise levels, a hybrid ventilation strategy has been developed for the building, based on noise modelling of nearby roads. A short-term noise survey was also carried out at the site in order to provide a reference point for the modelled noise levels. The noise survey confirmed the assumption that road traffic noise will be dominant at the school site. It is proposed that classrooms on the northern façade shall be provided with Enhanced Natural Ventilation Units (ENVUs), whereas higher noise levels on the southern façade will necessitate a mechanical ventilation system. With regard to internal sound insulation, performance requirements for the internal partitions and floors have been provided to meet the minimum criteria set out in BB93, along with examples of suitable constructions. Details and guidance have also been provided for internal doors, glazing and the proposed moveable partition. Regarding the reverberation times within the proposed building, advice on acoustic absorption is given in order to achieve the target reverberation time in the key spaces. This includes indicative acoustic absorption coverage areas required to achieve the criteria. A noise limit for any new items of external plant have been set to prevent increasing the existing background noise level. This limit is summarised in the table below and is to be applied at 1m from the façade of the nearest noise-sensitive receptor. School and community centre Existing background noise Plant noise level limit dB operation period (hrs) level dB LA90 LAeq, T 08:00 to 22:00 hours 55 45 Table 1 – Plant noise limits It is understood that external building services plant is only likely to operate whilst the school and community centre are open i.e. 08:00 to 22:00 hours. Further coordination works will be required during the next stage to assess the proposed construction against the required performance and advise on acoustically critical detailing such as junction and penetration details. This report and marked-up acoustic strategy drawings are based upon Atkins architectural drawings dated 27 January 2017. Strategy drawings will need to be updated to match architectural general arrangement drawings as the design progresses beyond Stage 3. Matthewsgreen Primary School and Community Facility – Acoustics – Stage 3 Report Document Ref - 1014076-RPT-AS-002 Rev - 162 Matthewsgreen Primary School and Community Facility Stage 3 Report | March 2017 Contents Introduction ............................................................................................................................. 1 1.1 Brief ......................................................................................................................................... 1 1.2 Design Standards .................................................................................................................... 1 Acoustic design criteria ............................................................................................................ 2 2.1 Planning conditions ................................................................................................................. 2 2.2 Building Bulletin 93 .................................................................................................................. 2 Baseline noise conditions ........................................................................................................ 4 Acoustic design advice ............................................................................................................ 5 4.1 Building envelope .................................................................................................................... 5 4.2 Ventilation strategy .................................................................................................................. 5 4.3 Dividing floors .......................................................................................................................... 5 4.4 Internal partitions ..................................................................................................................... 5 4.5 Internal glazing ........................................................................................................................ 6 4.6 Doorsets .................................................................................................................................. 7 4.7 Reverberation control .............................................................................................................. 7 M&E Acoustics ........................................................................................................................ 9 5.1 External plant noise emission .................................................................................................. 9 5.2 Plant isolation .......................................................................................................................... 9 5.3 General advice ........................................................................................................................ 9 Appendix A – Planning Conditions .................................................................................................. 11 Appendix B – Acoustic strategy drawings ........................................................................................ 12 Appendix C - Alternative performance standards ............................................................................ 15 Appendix D – Background noise level data ..................................................................................... 16 © This report is the copyright of Cundall Johnston & Partners LLP. The report is for the sole and confidential use of Faithful + Gould. It must not be reproduced whole or in part without the express written authorisation of Cundall Johnston & Partners LLP. Parties other than those specifically named in this disclaimer must not rely upon this report. Any third party relying on this report does so at their own risk. Cundall accepts no duty or responsibility whatsoever (including in negligence) to any such third party. Matthewsgreen Primary School and Community Facility – Acoustics – Stage 3 Report Document Ref - 1014076-RPT-AS-002 Rev - 163 Introduction 1.1 Brief This report sets out the acoustic strategies for the proposed Matthewsgreen Primary School and Community Facility. The acoustic strategy highlights the design solutions that could be employed, whilst delivering cost- effective and serviceable acoustic solutions to facilitate an excellent teaching, learning and working environment for the School. All advice included in this report should be read in conjunction with architectural, structural, mechanical and any other relevant design requirements. Any discrepancies should be communicated to the Acoustic Consultant. 1.2 Design Standards In England and Wales, all new schools/school buildings are controlled under the Building Regulations Requirement (E4) of Approved Document Part E (ADE) ‘Resistance to the Passage of Sound’. The Building Regulations state that the way of satisfying Requirement E4 is to demonstrate that all the performance standards detailed in Section 1 of ‘Building Bulletin 93 – Acoustic Design of Schools’ have been met. The acoustic strategy detailed in this report is provided in aim to fully comply with the criteria set out within: Building Bulletin 93 ‘Acoustic Design of Schools: Performance Standards’ (v17 February 2015); Local Planning Authority requirements. The minimum acoustic requirements outlined in BB93 are mandatory to all new teaching and learning spaces within the proposed development. Although recommendations are