**Document:** Sound Insulation Assessment Report **Application:** 14/00463/B — Conversion of existing retail shop into an extension of adjacent Bridge Inn public house, including replacement front tiles **Decision:** Refused **Decision Date:** 2014-07-04 **Parish:** Braddan **Document Type:** report / planning_statement **Source:** https://planningportal.im/a/34843-braddan-1-quines-replacement-conversion/documents/1339660 --- # Sound Insulation Assessment Report ## soundtesting [Table omitted in markdown export] acoustic consultancy & air leakage specialists ### Sound Insulation Assessment and Design Quines Corner 1 Quines Corner North Quay Douglas Isle of Man Date of Report: Tuesday 29th April 2014 Reference: 6385 RECEIVED ON 08 MAY 2014 DEPARTMENT OF INFRASTRUCTURE This report may not be reproduced other than in full, except with the prior written approval of Soundtesting.co.uk Ltd North Office 44 Canal Street Bootle Liverpool L20 8QU t 0151 933 6186 f 0151 922 7742 e info@soundtesting.co.uk South Office No. 6 Tuscan Studios 14 Muswell Hill Road Highgate London N6 5UG t 020 3286 2019 e london@soundtesting.co.uk Presented Cen 14/00/463 Received 8.5.14 DEPARTMENT OF INFRASTRUCTURE PLANNING and BUILDING CONTROL DIVISION Town and Country Planning Act 1999 Date and Officer Initials ## 1.0 General Information ### 1.1 Site Address 1 Quines Corner North Quay Douglas Isle of Man ### 1.2 Client Instructing Survey Heron & Brearley Ltd Old Castleton Road Kewaigue Isle of Man IM2 1QG ## 1.3 Consultant [Table omitted in markdown export] ## 1.5 Report Approval [Table omitted in markdown export] ### 2.0 Introduction This report follows report 6243; a Desk Top Sound Insulation Feasibility Report written 04 March 2014. The above address is an existing building, which is attached to The Bridge Public House. The ground floor is to become vacant and it’s proposed to convert the unit into a restaurant. The first floor is a residential dwelling. The floor between the proposed restaurant and residential dwelling is believed to be 200mm concrete. It is believed that no structural changes to exterior or internal walls are proposed. ### 2.1 Sound Insulation Assessment and Design Soundtesting.co.uk Ltd has carried out a site investigation and sound insulation test in order to establish the acoustic performance of the existing separating partition between the proposed restaurant and residential dwelling. The report will provide guidance of the sound insulation of the concrete partition and compare the results with NR curves applicable to residential dwellings. 4.0 Criteria 4.1 NR Curves NR curves are a series of curves, each curve having a defined value at each octave band. The curve is named after the 1KHz value. [Table omitted in markdown export] *The values for a typical busy restaurant are taken from The Little Red Book of Acoustics. These values give typical spectral dB levels for common noise sources and events; these provide a general overview of the orders of level which would be expected. The measured levels are below the recommended NR curves and therefore meet both NR 30 and NR25. [Table omitted in markdown export] ![data table or chart from page 5](https://images.planningportal.im/2014/05/251730.jpg) As a precautionary enhancement it is recommended to construct and independent ceiling below the concrete slab. This should consist of a MF Ceiling on acoustic hangers. Two layers of 12.5mm plasterboard should be fixed to the underside of the metal frame and sealed around the edges with 100mm mineral wool; density 45kg/m³ such as Hush Slab or similar fitted above the plasterboard. The new ceiling should be continuous and free of any penetrations or ventilation systems. If inset lights are intended to be used; acoustic hoods should be fitted over the light fittings. The restaurant should have sound absorbing material installed in the interior to control reverberation and sound reflections on hard surfaces. This could be achieved by installing sound absorbing panels. Please refer to www.restaurantnoise.co.uk. ![A technical architectural cross-section drawing illustrating a suspended ceiling construction with acoustic insulation and plasterboard layers attached to a concrete slab.](https://images.planningportal.im/2014/05/251731.jpg) ### 9.0. Conclusions The sound insulation test has demonstrated the current floor performance. This has been used to estimate the internal noise levels based on the values for a typical busy restaurant. As a precaution further acoustic treatment is recommended to the construction in the form of a MF Ceiling system. Reverberation should be kept to a minimum by installing sound absorbing panels. ### 10.0. References The Little Red Book of Acoustics – R. Watson & O Downey Acoustics and Noise Control 3rd Edn – Peters, Smith and Hollins www.google.co.uk/maps www.restaurantnoise.co.uk --- *Data sourced from the Isle of Man public planning register under the [Isle of Man Open Government Licence](https://www.gov.im/about-this-site/open-government-licence/).* *Canonical page: https://planningportal.im/a/34843-braddan-1-quines-replacement-conversion/documents/1339660*