Sound reduction index (SRI) - Revision history

Designing Buildings at 07:15, 19 February 2025

2025-02-19T07:15:48Z

← Older revision		Revision as of 07:15, 19 February 2025
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−	The sound reduction index (SRI) is a measure of the reduction in the intensity of sound when it passes through part of a building; in other words, the level of sound insulation provided. It is the difference between the sound intensity that hits one side of an object (such as a wall, door, window, partition and so on) and the sound intensity measured on the other side, expressed in decibels (dB).	+	The sound reduction index (SRI, or sometimes just R) is a measure of the reduction in the intensity of sound when it passes through part of a building; in other words, the level of sound insulation provided. It is the difference between the sound intensity that hits one side of an object (such as a wall, door, window, partition and so on) and the sound intensity measured on the other side, expressed in decibels (dB).

	When sound hits the surface of a material, some will be reflected, some will be absorbed by the material and some will be transmitted through it. By determining the SRI, the effectiveness of the element as an insulator (the amount of sound that it has prevented from passing from one side to another) can be assessed.		When sound hits the surface of a material, some will be reflected, some will be absorbed by the material and some will be transmitted through it. By determining the SRI, the effectiveness of the element as an insulator (the amount of sound that it has prevented from passing from one side to another) can be assessed.
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	In the USA, the sound transmission class rating is typically measured as the Noise Reduction Coeffiecient (NRC). This measurement is in the process of transitioning to the Sound Absorption Average (SAA).		In the USA, the sound transmission class rating is typically measured as the Noise Reduction Coeffiecient (NRC). This measurement is in the process of transitioning to the Sound Absorption Average (SAA).

−	= Related articles on Designing Buildings ~~Wiki~~ =	+	NB Approved document E: Resistance to the passage of sound, 2003 edition incorporating 2004, 2010, 2013 and 2015 amendments, defines sound reduction index (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.’
		+
		+	= Related articles on Designing Buildings =

	* Acoustics in the workplace.		* Acoustics in the workplace.

Editor at 10:02, 7 September 2021

2021-09-07T10:02:47Z

← Older revision		Revision as of 10:02, 7 September 2021
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	* Acoustics in the workplace.		* Acoustics in the workplace.
	* Airborne sound.		* Airborne sound.
		+	* BSRIA Noise in the built environment TG 20/2021.
	* Building acoustics.		* Building acoustics.
	* Decibel.		* Decibel.

Designing Buildings at 08:35, 2 November 2020

2020-11-02T08:35:19Z

← Older revision		Revision as of 08:35, 2 November 2020
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	* Structure-borne sound.		* Structure-borne sound.

−	[[Category:Articles_needing_more_work]] [[Category:~~Standards_/_measurements~~]] [[Category:~~DCN_Standard~~]] [[Category:~~Design~~]] [[Category:~~Products_/_components~~]] [[Category:~~DCN_Product_Knowledge~~]]	+	[[Category:Articles_needing_more_work]] [[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Standards_/_measurements]] [[Category:Design]] [[Category:Products_/_components]]

Editor at 13:59, 26 June 2020

2020-06-26T13:59:04Z

← Older revision		Revision as of 13:59, 26 June 2020
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	In the USA, the sound transmission class rating is typically measured as the Noise Reduction Coeffiecient (NRC). This measurement is in the process of transitioning to the Sound Absorption Average (SAA).		In the USA, the sound transmission class rating is typically measured as the Noise Reduction Coeffiecient (NRC). This measurement is in the process of transitioning to the Sound Absorption Average (SAA).

−	~~= Find out more =~~	+	= Related articles on Designing Buildings Wiki =
−		+
−	=== Related articles on Designing Buildings Wiki ===	+

		+	* Acoustics in the workplace.
	* Airborne sound.		* Airborne sound.
	* Building acoustics.		* Building acoustics.
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	* Structure-borne sound.		* Structure-borne sound.

−	[[Category:Articles_needing_more_work]] [[Category:Standards_/_measurements]] [[Category:Design]] [[Category:Products_/_components]]	+	[[Category:Articles_needing_more_work]] [[Category:Standards_/_measurements]] [[Category:DCN_Standard]] [[Category:Design]] [[Category:Products_/_components]] [[Category:DCN_Product_Knowledge]]

Editor at 16:28, 20 May 2020

2020-05-20T16:28:44Z

← Older revision		Revision as of 16:28, 20 May 2020
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	SRI is defined in the series of international standards ISO 16283 (parts 1-3). Standard testing methods, both in laboratory and field environments, have been established for measuring SRI.		SRI is defined in the series of international standards ISO 16283 (parts 1-3). Standard testing methods, both in laboratory and field environments, have been established for measuring SRI.

−	In the USA, the sound transmission class rating is typically ~~used instead~~.	+	In the USA, the sound transmission class rating is typically measured as the Noise Reduction Coeffiecient (NRC). This measurement is in the process of transitioning to the Sound Absorption Average (SAA).

	= Find out more =		= Find out more =
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	* Decibel.		* Decibel.
	* Impact sound.		* Impact sound.
		+	* Room acoustics.
	* Sound absorption.		* Sound absorption.
	* Sound absorption coefficient.		* Sound absorption coefficient.

Designing Buildings at 07:44, 13 April 2018

2018-04-13T07:44:11Z

← Older revision		Revision as of 07:44, 13 April 2018
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−	The sound reduction index (SRI) is a measure of the reduction in the intensity of sound when it passes through ~~an object~~; in other words, the level of sound insulation provided. It is the difference between the sound intensity that hits one side of an object (such as a wall, door, window, partition and so on) and the sound intensity measured on the other side expressed in decibels (dB).	+	The sound reduction index (SRI) is a measure of the reduction in the intensity of sound when it passes through part of a building; in other words, the level of sound insulation provided. It is the difference between the sound intensity that hits one side of an object (such as a wall, door, window, partition and so on) and the sound intensity measured on the other side, expressed in decibels (dB).

	When sound hits the surface of a material, some will be reflected, some will be absorbed by the material and some will be transmitted through it. By determining the SRI, the effectiveness of the element as an insulator (the amount of sound that it has prevented from passing from one side to another) can be assessed.		When sound hits the surface of a material, some will be reflected, some will be absorbed by the material and some will be transmitted through it. By determining the SRI, the effectiveness of the element as an insulator (the amount of sound that it has prevented from passing from one side to another) can be assessed.

Designing Buildings at 07:42, 13 April 2018

2018-04-13T07:42:30Z

← Older revision		Revision as of 07:42, 13 April 2018
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−	The sound reduction index (SRI) is a measure of the reduction in ~~sound~~ intensity when it ~~crosses a surface~~; in other words, the level of sound insulation provided. It is ~~expressed as~~ the difference between the sound intensity that hits one side of ~~a structure~~ (~~i.e.~~ wall, door, window, partition) and the sound intensity measured on the other side.	+	The sound reduction index (SRI) is a measure of the reduction in the intensity of sound when it passes through an object; in other words, the level of sound insulation provided. It is the difference between the sound intensity that hits one side of an object (such as a wall, door, window, partition and so on) and the sound intensity measured on the other side expressed in decibels (dB).

−	When sound hits the surface of a material, some will be reflected, some will be absorbed by the material and some will be transmitted through ~~the material~~. By determining the SRI, the effectiveness of the ~~structural~~ element as an insulator (the amount that is prevented from passing ~~through the material~~) can be assessed.	+	When sound hits the surface of a material, some will be reflected, some will be absorbed by the material and some will be transmitted through it. By determining the SRI, the effectiveness of the element as an insulator (the amount of sound that it has prevented from passing from one side to another) can be assessed.

−	~~Standardised~~ testing methods, both in laboratory and field environments, have been established for ~~working out the~~ SRI~~. It is measured in decibels (dB)~~.	+	SRI is defined in the series of international standards ISO 16283 (parts 1-3). Standard testing methods, both in laboratory and field environments, have been established for measuring SRI.

−	~~SRI is defined in the series of international standards ISO 16283 (parts 1-3), but in~~ the USA, the sound transmission class rating is typically used instead.	+	In the USA, the sound transmission class rating is typically used instead.

	= Find out more =		= Find out more =

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The sound reduction index (SRI) is a measure of the reduction in sound intensity when it crosses a surface; in other words, the level of sound insulation provided. It is expressed as the difference between the sound intensity that hits one side of a structure (i.e. wall, door, window, partition) and the sound intensity measured on the other side.

When sound hits the surface of a material, some will be reflected, some will be absorbed by the material and some will be transmitted through the material. By determining the SRI, the effectiveness of the structural element as an insulator (the amount that is prevented from passing through the material) can be assessed.

Standardised testing methods, both in laboratory and field environments, have been established for working out the SRI. It is measured in decibels (dB).

SRI is defined in the series of international standards ISO 16283 (parts 1-3), but in the USA, the sound transmission class rating is typically used instead.

= Find out more =

=== Related articles on Designing Buildings Wiki ===

* Airborne sound.
* Building acoustics.
* Decibel.
* Impact sound.
* Sound absorption.
* Sound absorption coefficient.
* Sound frequency.
* Sound insulation.
* Sound v noise.
* Structure-borne sound.

[[Category:Articles_needing_more_work]] [[Category:Standards_/_measurements]] [[Category:Design]] [[Category:Products_/_components]]