70


INSULATION; HEATING, VENTILATION & SERVICES


Acoustic floor build-up ensures student accommodation exceeds document E standards


C


MS Danskin Acoustics has worked with acoustic consultants


Atelier


Crescendo to arrive at a floor build- up which has contributed to achieving acoustic performance significantly exceeding Approved Document E ‘Resistance to the passage of sound’ 2003 standards at new student accommodation for St Catharine’s College in Cambridge.


The accommodation provides two new houses and communal spaces for students to work and socialise. The project was designed by Cottrell & Vermeulen


and the main contractor was Conamar Building Services. Designed with sustainability in mind,


timber


Internal base floors are cross laminated (CLT),


which supports sustainable ethos behind the design. Architecture,


the student accommodation has mass timber frames (mostly Cross Laminated Timber), triple-glazed windows and air-source heat pumps.


the CLT is increasingly used as it helps in locking


away carbon by using it as a long-term construction base and it reduces the use of concrete in floors. However, because CLT is around one third of the mass of concrete, it presents challenges acoustically.


Its sound


reduction index is poorer and its damping properties from impacts are also lower than concrete, therefore it requires an acoustic strategy to limit impact and airborne sound travelling through. After taking into account the BREEAM® requirements, the criteria to be met for St Catharine’s was that the airborne noise reduction must be over 48 dB DnTw and the impact noise must be measured as under 59 dB LnTw.


CMS Danskin Acoustics designed and supplied a floor/ceiling build-up using recycled materials to help improve the floor mass and enhance its impact absorbing properties. The strategy involved double REGUPOL impact isolation layers. Layers of 3 mm REGUPOL sonus eco, 18 mm Versapanel®


from Euroform ADF03_CMS_Insulation - Acoustic_Half Page Advertorial.indd 1


and 15 mm REGUPOL sonus core were used to isolate impact sound, followed by a 32 mm Smartspan, which is finished with a timber floorboard or plywood underlay with vinyl. CMS Danskin Acoustics also specified


and supplied Kinetics IsoGrid hangers, a high performance


hanger


ceilings where the maximum noise reduction performance is required.


01925 577711 www.cmsdanskin.co.uk 14/03/2024 11:33 used for suspending


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ADF MARCH 2024


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