Acoustics: Rain Impact Noise

Transcription

1 Insulation CI/Sf (27.9) Rn7 P2 Fourth Issue May 2017 coustics: Rain Impact Noise Low Energy Low Carbon uildings

2 Introduction This Technical ulletin is designed to demonstrate that the effect of rain impact noise in both steel and plywood deck flat roofs can be successfully mitigated by the specification of Kingspan Thermaroof and Kingspan products. It also demonstrates that the introduction of a 24 mm mineral fibre ceiling tile can significantly improve the acoustic performance in a Kingspan Thermaroof build up. The installation of ceiling tiles is also likely to further improve the impact sound reduction levels in the tested Kingspan configuration, but any additional layers and subsequent benefit would need to be determined by a qualified acoustician. s the specification of ceiling tiles does not normally form part of the roof build up, the acoustic benefits may not be accounted for at the design stage. This data is particularly useful in relation to the design of both school and healthcare buildings to help ensure acceptable indoor noise levels. The performance standards for school buildings are set out in uilding ulletin 93 and for healthcare buildings in Healthcare Technical Memorandum series of rain impact noise tests were conducted in accordance with International Standard ISO :2006 / S EN ISO :2006 at SRL s laboratory at Holbrook House, Sudbury, Suffolk, to determine the rain generated impact sound transmission of various roof build-ups, including Kingspan Thermaroof and Kingspan products. ssessments were then made based on Kingspan Thermaroof results with the addition of mineral fibre ceiling tiles. The LI results from these tests can be used by acoustic consultants to calculate acoustic conditions to meet the Leq performance standards and criteria set out in the performance standard documents referred to above. These calculations are complex and consider variables including room volumes, surfaces and finishes, roof / ceiling area, and reverberation data. Definitions used in this Technical ulletin Conclusions l l L I in (d) Sound intensity is the flow of sound power per unit area in a given direction, measured over an area perpendicular to the direction of flow, and is measured in Watts per metre squared (W/m 2 ). L I weighted in (d) This is the weighted to reflect how we actually hear noise. L eq Equivalent weighted Sound Pressure (indoor ambient noise) Level (d) Sound pressure is the fluctuation in air pressure from steady atmospheric pressure due to sound. It is measured in Pascals (Pa). Rain impact noise can be mitigated by simple roof build ups insulated with Kingspan Thermaroof and Kingspan flat roof insulation products. The addition of a 24 mm mineral fibre ceiling tile in a Kingspan Thermaroof build up, (which is often not specified in a roof build up as it is part of the internal fit out), results in significantly improved performance. If you would like more information or to discuss anything you have read in this Technical ulletin, please contact us by ing: acoustics@kingspaninsulation.co.uk 2

3 ppendix Rain Impact Noise Data 1 Construction ed and ssessed Single ply membrane, 100 mm Kingspan Thermaroof TR26 LPC/FM, polythene vapour control layer and a galvanized metal deck Same as above with correction for 24 mm mineral fibre ceiling tile (8.23 Kg/m 2 ) with a 300 mm ceiling void L I (d) Frequency (L I ) in d over a Range of Frequencies (SRL 3 Report No. C/05/6W/40269/R03) (Predicted - SRL Report No. C/40269) *ssessment carried out by Sound Research Laboratories. weighted (L I ) L I (d)

4 2 Construction ed and ssessed Fleece backed single ply membrane, 100 mm Kingspan Thermaroof TR26 LPC/FM, polythene vapour control layer and a galvanized metal deck Same as above with correction for 24 mm mineral fibre ceiling tile (8.23 Kg/m 2 ) with a 300 mm ceiling void L I (d) (L I ) in d over a Range of Frequencies (SRL 4 Report No. C/05/6W/40269/R03) (Predicted - SRL Report No. C/40269) *ssessment carried out by Sound Research Laboratories. weighted (L I ) L I (d)

5 3 Construction ed and ssessed Fleece backed single ply membrane, 110 mm Kingspan Thermaroof TR27 LPC/FM, polythene vapour control layer and a galvanized metal deck Same as above with correction for 24 mm mineral fibre ceiling tile (8.23 Kg/m 2 ) with a 300 mm ceiling void L I (d) (L I ) in d over a Range of Frequencies (SRL 5 Report No. C/05/6W/40269/R03) (Predicted - SRL Report No. C/40269) *ssessment carried out by Sound Research Laboratories. weighted (L I ) L I (d)

6 4 Construction ed and ssessed Fleece-backed single ply membrane, 100 mm Kingspan Thermaroof TR27 LPC/FM, 10 mm Rubbertech R10 and a galvanized metal deck Same as above with correction for 24 mm mineral fibre ceiling tile (8.23 Kg/m 2 ) with a 300 mm ceiling void L I (d) (L I ) in d over a Range of Frequencies (ed - SRL 1 Report No. C/09/8H/20777/R01) (Predicted - SRL Report No. C/40269) *ssessment carried out by Sound Research Laboratories. weighted (L I ) L I (d)

7 5 Construction ed 20 mm sedum mat, 60 mm soil mix substrate, 25 mm corrugated HDPE drainage layer, 2.8 mm synthetic fibre protection mat, single ply membrane, 100 mm Kingspan Thermaroof TR26/27 LPC/FM and a galvanized metal deck 7 Kingspan Rain Noise Results 6 5 L I (d) (L I ) in d over a Range of Frequencies (SRL. 2 Report No. C/09/8H/20923) weighted (L I ) L I (d)

8 6 Construction ed Single ply membrane, 25 mm Kingspan Thermaroof TR27 LPC/FM overlay, 50 mm Kingspan, 3 mm rubber crumb, polyethylene foil vapour control layer and an 18 mm plywood deck L I (d) (L I ) in d over a Range of Frequencies (ed - SRL 1 Report No. C/23250/T02) weighted (L I ) L I (d)

9 7 Construction ed Single ply membrane, 25 mm Kingspan Thermaroof TR27 LPC/FM overlay, 50 mm Kingspan, 10 mm Rubbertech R10, polyethylene foil vapour control layer and an 18 mm plywood deck L I (d) (L I ) in d over a Range of Frequencies (ed - SRL 2 Report No. C/23250/T02) weighted (L I ) L I (d)

10 Contact Details Customer Service For quotations, order placement and details of despatches please contact the Kingspan Insulation Customer Service Department on the numbers below: Tel: +44 (0) Fax: +44 (0) Literature & Samples Kingspan Insulation produces a comprehensive range of technical literature for specifi ers, contractors, stockists and end users. The literature contains clear user friendly advice on typical design; design considerations; thermal properties; sitework and product data. For copies please contact the Kingspan Insulation Marketing Department, or visit the Kingspan Insulation website, using the details below: Tel: +44 (0) Fax: +44 (0) literature@kingspaninsulation.co.uk Tapered Roofing For technical guidance, quotations, order placement and details of despatches please contact the Kingspan Insulation Tapered Roofi ng Department on the numbers below: Tel: +44 (0) Fax: +44 (0) tapered@kingspaninsulation.co.uk Technical dvice / Design Kingspan Insulation supports all of its products with a comprehensive Technical dvisory Service. Calculations can be carried out to provide U values, condensation / dew point risk, required insulation thicknesses etc U value calculations can also be carried out on the Kingspan Insulation U value Calculator, available for free online at or downloaded as an pp. The Kingspan Insulation Technical Service Department can also give general application advice and advice on design detailing and fi xing etc... Site surveys are also undertaken as appropriate. The Kingspan Insulation ritish Technical Service Department operates under a management system certifi ed to the Scheme for ssessing the Competency of Persons to Undertake U value and CERTIFICTE CS/ Condensation Risk Calculations. U Value Competency Scheme Please contact the Kingspan Insulation Technical Service Department on the numbers below: Tel: +44 (0) Fax: +44 (0) technical@kingspaninsulation.co.uk General Enquiries For all other enquiries contact Kingspan Insulation on the numbers below: Tel: +44 (0) Fax: +44 (0) info@kingspaninsulation.co.uk Kingspan Insulation Ltd. reserves the right to amend product specifi cations without prior notice. Product thicknesses shown in this document should not be taken as being available ex stock and reference should be made to the current Kingspan Insulation price list or advice sought from Kingspan Insulation s Customer Service Department (see above left). The information, technical details and fi xing instructions etc. included in this literature are given in good faith and apply to uses described. Recommendations for use should be verifi ed for suitability and compliance with actual requirements, specifi cations and any applicable laws and regulations. For other applications or conditions of use, Kingspan Insulation offers a Technical dvisory Service (see above), the advice of which should be sought for uses of Kingspan Insulation products that are not specifi cally described herein. Please check that your copy of this literature is current by contacting the Kingspan Insulation Marketing Department (see left). Kingspan Insulation Ltd Pembridge, Leominster, Herefordshire HR6 9L, UK Kingspan, OPTIM-R, Thermaroof and the Lion Device are Registered Trademarks of the Kingspan Group plc in the UK and other countries. ll rights reserved. Registered in England & Wales, No Registered Offi ce: Pembridge, Leominster, Herefordshire HR6 9L UK. VT G