Acoustic consultant

2026-04-19T06:55:22Z

Atelier Crescendo:

An [https://ateliercrescendo.ac/atelier-crescendo-acoustic-consultancy/ acoustic consultant] can help to design, assess, manage and control sound and vibrations in the built environment. They might provide consultancy for the design or assessment of acoustics in homes, workplaces, leisure facilities, the outdoor environment and so on. They may also be described as acousticians or acoustic engineers.

The duties undertaken by acoustic consultants might include:

* Offering advice to architects and other designers.
* Noise assessments of existing buildings.
* Compliance testing.
* Vibration monitoring.
* Construction site surveys.
* Assessing industrial sites.
* Assessing noise levels and noise nuisance and providing noise mitigation advice.
* Assessing problem spaces and equipment and proposing mitigation strategies.
* Assessing intelligibility and reverberation time.
* Carrying out acoustic analysis and design using specialist modelling software.
* Assessing how changes in design affect sound levels and quality.
* Technical report writing.
* Preparing proposals.
* Liaising with clients, project managers, designers and contractors.
* Designing and working on specialist facilities and equipment such as recording studio and broadcast equipment.
* Developing acoustic environments for specialist spaces such as theatres, concert halls, cinemas, teaching spaces, arenas and so on.
* Assessing the impact of developments such as airports and roads.
* Assessing environmental noise and carrying out noise surveys.
* Expert witness services.

Acoustic consultants tend to be practical people and creative problem solvers. They require a broad knowledge of the subject, legislation and standards and will generally hold a relevant degree-level qualification and a diploma or post graduate qualification in acoustics, such as the IOA diploma. They can become members of the [http://www.ioa.org.uk/ Institute of Acoustics] (IOA). Consultancy practices and businesses can join the [http://www.association-of-noise-consultants.co.uk/ Association of Noise Consultants] (ANC). Like many other careers,a budding acoustic consultant usually starts out through a work experience role.

They can choose to specialise in specific areas of acoustics, such as; audio and hi-fi design, auditorium and concert hall design, broadcasting and telecommunications, teaching spaces, laboratory design and so on.

See also: Suitably Qualified Acoustician.

= Related articles on Designing Buildings Wiki =

* Airborne sound.
* BREEAM Acoustic performance.
* British standards.
* Building acoustics.
* Building Bulletin 93: acoustic design of schools.
* Building regulations.
* Control of Noise at Work Regulations 2005.
* Decibel.
* Flanking sound.
* Impact sound.
* Noise nuisance.
* Reverberation time.
* Room acoustics.
* Sound absorption.
* Sound insulation.
* Sound v noise.
* Structure-borne sound.
* Suitably Qualified Acoustician.
* Walt Disney Concert Hall.

[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Person]] [[Category:Roles_/_services]] [[Category:People]]

Sound insulation in buildings

2026-04-19T06:54:31Z

Atelier Crescendo:

= Introduction =

Sound insulation describes the reduction in sound across a partition. The sound insulation across a good conventional, lightweight, office to office construction is typically in the order of 45 dB Dw.

This means that if the sound level in the source room is around 65 dB (a typical level for speech), the sound level in the adjacent room, the receiver room, will be approximately 20 dB (barely audible).

If sound levels are increased in the source room to 75 dB (raised voice), sound levels within the adjacent room will also increase to around 30 dB (audible). Sound insulation therefore describes the level of sound lost across a partition and not the level of sound within a adjacent room.

= Privacy =

Privacy describes the perceived sound reduction across a wall. Privacy is a function of both sound insulation and background noise. Background noise is made up of services noise and environmental noise sources breaking in through the facade or open windows, vents etc.

If the background noise within a room is increased by 5 to 10 dB, the perceived level of privacy across a partition is also increased by 5 to 10 dB. Therefore, when looking at required sound insulation levels on-site, it is important to consider both the background noise in the receiver room and the sound insulation across the partition.

= Subjective description of sound insulation =

The table below provides an illustrative representation of privacy. This table specifies two Dw levels for a partition, one for background noise levels in the receiver room of 35 dBA1, and the second for background noise levels of 40 dBA2.

[[File:Illustrative_representation_of_privacy.jpg|link=File:Illustrative_representation_of_privacy.jpg]]

= Rw (Lab Tested Sound Reduction Index) and Dw (On Site Sound Reduction Index) =

Two parameters are used to describe the sound insulation of a partition, Dw and Rw. Dw represents the sound insulation between rooms on-site. Since these figures describe the final site requirements, Dw levels are specified by clients and Building Regulations. Rw represents the lab tested sound insulation of an element making up a partition wall/floor type. Due to flanking and other factors, [https://ateliercrescendo.ac/lab-vs-in-situ-sound-insulation-why-the-difference-matters/ lab rated sound reduction levels will not be achieved on-site].

Conventionally, there is a 5 - 10 dB reduction between a Rw lab tested figure and an on-site Dw figure. The conversion between Dw and Rw is relatively complex and takes into consideration receiver room volume, receiver room reverberation times and the area of the separating partition. The conversion between Rw and Dw should always be calculated.

[[File:Rw_vs_Dntw.jpg|link=File:Rw_vs_Dntw.jpg]]

NB: Approved document E, Resistance to the passage of sound, defines the sound reduction index (which it describes as 'R') as a '...quantity, measured in a laboratory, which characterises the sound insulating properties of a material or building element in a stated frequency band. See BS EN ISO 140-3:1995.'

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This article was created by --[[User:MACH_Acoustics|MACH Acoustics]] 13:06, 28 November 2013 (UTC)

= Related articles on Designing Buildings =

* Acoustic insulation market.
* Acoustic design for health and wellbeing.
* Acoustic louvre.
* Acoustics in the workplace.
* Airborne sound.
* Approved Document E.
* Ash deafening.
* BREEAM Insulation.
* Building acoustics.
* Building Bulletin 93: acoustic design of schools.
* Decibel.
* Flanking sound.
* Impact sound.
* Mineral wool.
* Movable walls.
* Noise - doors and windows.
* Noise nuisance.
* Part E compliance.
* Pre-completion sound testing.
* Reverberation.
* Robust details certification scheme.
* Room acoustics.
* [[Rw_and_Dw/DnTw_in_Acoustics_-_What_do_they_mean%3F|Rw and Dw/DnTw in Acoustics]]
* Sound absorption.
* Sound absorption coefficient.
* Sound frequency.
* Sound insulation in dwellings: Part 1: An introduction (GG 83-1).
* Sound insulation in dwellings: Part 3: Material change of use (conversions) (GG 83-3).
* Sound insulation testing.
* Sound v noise.
* Sound reduction index (SRI).
* Structure-borne sound.
* Suitable insulation can help preserve the golden sound of silence.

= External references =

* MACH Acoustics: Subjective Evaluation and Conversion between RW and DW.
* ParkerJones Acoustics: [https://www.parkerjonesacoustics.com/insights/articles/rw-and-dntw Rw and DnT,w – What do they mean?]

[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:Theory]] [[Category:Standards_/_measurements]]

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Acoustic consultant

Sound insulation in buildings