Cavity barrier - Revision history

Designing Buildings at 07:35, 14 January 2025

2025-01-14T07:35:01Z

← Older revision		Revision as of 07:35, 14 January 2025
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	* Open state cavity barrier.		* Open state cavity barrier.

−	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:DCN_Regulation]] [[Category:Regulations]] [[Category:Products_/_components]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:DCN_Regulation]] [[Category:Regulations]] [[Category:Products_/_components]] [[Category:Building_safety]]

Designing Buildings at 07:30, 14 January 2025

2025-01-14T07:30:57Z

← Older revision		Revision as of 07:30, 14 January 2025
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	= Related articles on Designing Buildings =		= Related articles on Designing Buildings =

−	* Approved document B.
	* Building regulations.		* Building regulations.
−	* ~~Concealed space.~~	+	* Closed state cavity barrier.
−	* Elements of a building.	+
	* Fire.		* Fire.
	* Fire-barrier.		* Fire-barrier.
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	* Fire-stopping in buildings.		* Fire-stopping in buildings.
	* Suspended ceiling.		* Suspended ceiling.
−	* ~~Types of space~~.	+	* Open state cavity barrier.

	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:DCN_Regulation]] [[Category:Regulations]] [[Category:Products_/_components]]		[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:DCN_Regulation]] [[Category:Regulations]] [[Category:Products_/_components]]

Designing Buildings at 05:02, 16 August 2023

2023-08-16T05:02:23Z

← Older revision		Revision as of 05:02, 16 August 2023
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	It defines a closed state cavity barrier as a: ‘nonloadbearing element designed to provide fire separation within or at the edges of a concealed space (cavity) by forming a tight seal (possibly under compression) between the inner and outer surfaces of the cavity.’		It defines a closed state cavity barrier as a: ‘nonloadbearing element designed to provide fire separation within or at the edges of a concealed space (cavity) by forming a tight seal (possibly under compression) between the inner and outer surfaces of the cavity.’

−	And an open state cavity barrier as a: ~~‘nonloadbearing~~ element designed to provide fire separation in a concealed space (cavity), which is open to allow ventilation and drainage in the cold state, but which closes when exposed to a developing fire.’	+	And an open state cavity barrier as a: ‘non-loadbearing element designed to provide fire separation in a concealed space (cavity), which is open to allow ventilation and drainage in the cold state, but which closes when exposed to a developing fire.’
		+
		+	See also: Fire-barrier.

	= Related articles on Designing Buildings =		= Related articles on Designing Buildings =
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	* Elements of a building.		* Elements of a building.
	* Fire.		* Fire.
		+	* Fire-barrier.
	* Fire collar.		* Fire collar.
	* Fire compartmentation.		* Fire compartmentation.

Designing Buildings at 04:53, 16 August 2023

2023-08-16T04:53:08Z

← Older revision		Revision as of 04:53, 16 August 2023
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	Cavity barriers must be fitted tightly to rigid construction, or suitably fire-stopped at a junction between itself and construction to which it cannot be fitted so tightly (e.g. slates, tiles, sheeting, etc.). The likelihood of the fixings failing in the event of a fire should be carefully considered. Services that may run through a barrier should be fire-stopped using appropriate materials.		Cavity barriers must be fitted tightly to rigid construction, or suitably fire-stopped at a junction between itself and construction to which it cannot be fitted so tightly (e.g. slates, tiles, sheeting, etc.). The likelihood of the fixings failing in the event of a fire should be carefully considered. Services that may run through a barrier should be fire-stopped using appropriate materials.

−	= Related articles on Designing Buildings ~~Wiki.~~ =	+	[https://www.bsigroup.com/en-GB/standards/pas-9980/ PAS 9980:2022, Fire risk appraisal of external wall construction and cladding of existing blocks of flats – Code of practice], published by BSI Standards Limited in 2022, defines a cavity barrier as a: ‘product used to close or separate a concealed space, the purpose of which is to restrict the spread of smoke and/or fire.’
		+
		+	It defines a closed state cavity barrier as a: ‘nonloadbearing element designed to provide fire separation within or at the edges of a concealed space (cavity) by forming a tight seal (possibly under compression) between the inner and outer surfaces of the cavity.’
		+
		+	And an open state cavity barrier as a: ‘nonloadbearing element designed to provide fire separation in a concealed space (cavity), which is open to allow ventilation and drainage in the cold state, but which closes when exposed to a developing fire.’
		+
		+	= Related articles on Designing Buildings =

	* Approved document B.		* Approved document B.

Designing Buildings at 09:36, 2 October 2020

2020-10-02T09:36:32Z

← Older revision		Revision as of 09:36, 2 October 2020
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	* Types of space.		* Types of space.

−	[[Category:~~Regulations~~]] [[Category:DCN_Regulation]] [[Category:~~Products_/_components~~]] [[Category:~~DCN_Product_Knowledge~~]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:DCN_Regulation]] [[Category:Regulations]] [[Category:Products_/_components]]

Designing Buildings at 16:05, 28 October 2019

2019-10-28T16:05:16Z

← Older revision		Revision as of 16:05, 28 October 2019
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−	Approved document B ~~of the building regulations~~, Fire Safety, defines a cavity ~~barrier~~ as:	+	Approved document B, Fire Safety, Volume 2, Buildings other than dwellinghouses (2019 edition), defines a cavity as:

−	{\|	+	A space enclosed by elements of a building (including a suspended ceiling) or contained within an element, but that is not a room, cupboard, circulation space, protected shaft, or space within a flue, chute, duct, pipe or conduit.
−	\| A ~~construction, other than~~ a ~~smoke curtain~~, ~~provided to close~~ a ~~concealed~~ space ~~against penetration of smoke or flame~~, or ~~provided to restrict the movement of smoke or flame~~ within ~~such~~ a ~~space~~.	+
−	\|}	+

−	~~Where~~ a ~~concealed space is~~:	+	And a cavity barrier as:

−	{\|	+	A construction within a cavity, other than a smoke curtain, to perform either of the following functions.
−	\| A ~~space enclosed by elements of~~ a ~~building (including a suspended ceiling) or contained within an element~~, ~~but not~~ a ~~room~~, ~~cupboard, circulation space, protected shaft or space within~~ a ~~flue, chute, duct, pipe~~ or ~~conduit~~.	+
−	\|}	+	* Close a cavity to stop smoke or flame entering.
		+	* Restrict the movement of smoke or flame within a cavity

	As most buildings contain a multitude of concealed cavities and voids within walls, floors, ceilings and roofs, effective cavity barriers are essential to restrict the spread of smoke or flames. If there is a fire, the intumescent material which makes up the barrier will expand, sealing off the gaps.		As most buildings contain a multitude of concealed cavities and voids within walls, floors, ceilings and roofs, effective cavity barriers are essential to restrict the spread of smoke or flames. If there is a fire, the intumescent material which makes up the barrier will expand, sealing off the gaps.
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	Cavity barriers must be fitted tightly to rigid construction, or suitably fire-stopped at a junction between itself and construction to which it cannot be fitted so tightly (e.g. slates, tiles, sheeting, etc.). The likelihood of the fixings failing in the event of a fire should be carefully considered. Services that may run through a barrier should be fire-stopped using appropriate materials.		Cavity barriers must be fitted tightly to rigid construction, or suitably fire-stopped at a junction between itself and construction to which it cannot be fitted so tightly (e.g. slates, tiles, sheeting, etc.). The likelihood of the fixings failing in the event of a fire should be carefully considered. Services that may run through a barrier should be fire-stopped using appropriate materials.

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

	* Approved document B.		* Approved document B.
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	* Types of space.		* Types of space.

−	[[Category:Regulations]] [[Category:Products_/_components]]	+	[[Category:Regulations]] [[Category:DCN_Regulation]] [[Category:Products_/_components]] [[Category:DCN_Product_Knowledge]]

Editor at 15:57, 24 July 2018

2018-07-24T15:57:20Z

← Older revision		Revision as of 15:57, 24 July 2018
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	* Elements of a building.		* Elements of a building.
	* Fire.		* Fire.
		+	* Fire collar.
	* Fire compartmentation.		* Fire compartmentation.
	* Fire-stopping in buildings.		* Fire-stopping in buildings.

Editor at 10:44, 5 June 2018

2018-06-05T10:44:47Z

← Older revision		Revision as of 10:44, 5 June 2018
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	{\|		{\|
−	~~\|width="100%"~~\|A construction, other than a smoke curtain, provided to close a concealed space against penetration of smoke or flame, or provided to restrict the movement of smoke or flame within such a space.	+	\| A construction, other than a smoke curtain, provided to close a concealed space against penetration of smoke or flame, or provided to restrict the movement of smoke or flame within such a space.
	\|}		\|}

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	{\|		{\|
−	\|A space enclosed by elements of a building (including a suspended ceiling) or contained within an element, but not a room, cupboard, circulation space, protected shaft or space within a flue, chute, duct, pipe or conduit.	+	\| A space enclosed by elements of a building (including a suspended ceiling) or contained within an element, but not a room, cupboard, circulation space, protected shaft or space within a flue, chute, duct, pipe or conduit.
	\|}		\|}
		+
		+	As most buildings contain a multitude of concealed cavities and voids within walls, floors, ceilings and roofs, effective cavity barriers are essential to restrict the spread of smoke or flames. If there is a fire, the intumescent material which makes up the barrier will expand, sealing off the gaps.
		+
		+	Cavity barriers are typically pieces of fire-stopping material which are fitted within building cavities - horizontally at each floor, and vertically at each party wall. This assists with fire compartmentation.
		+
		+	The location of each cavity will determine the appropriate maximum distance between the barriers, as well as the class of surface which is exposed within the cavity. The performance of cavity barriers much be maintained throughout the lifecycle of a building, with consideration given to any building movement due to subsidence, shrinkage, and so on.
		+
		+	Cavity barriers must be fitted tightly to rigid construction, or suitably fire-stopped at a junction between itself and construction to which it cannot be fitted so tightly (e.g. slates, tiles, sheeting, etc.). The likelihood of the fixings failing in the event of a fire should be carefully considered. Services that may run through a barrier should be fire-stopped using appropriate materials.

	= Find out more =		= Find out more =
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	=== Related articles on Designing Buildings Wiki. ===		=== Related articles on Designing Buildings Wiki. ===

−	* Approved documents.
	* Approved document B.		* Approved document B.
	* Building regulations.		* Building regulations.
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	* Elements of a building.		* Elements of a building.
	* Fire.		* Fire.
		+	* Fire compartmentation.
		+	* Fire-stopping in buildings.
	* Suspended ceiling.		* Suspended ceiling.
	* Types of space.		* Types of space.

	[[Category:Regulations]] [[Category:Products_/_components]]		[[Category:Regulations]] [[Category:Products_/_components]]

Designing Buildings: Created page with "Approved document B of the building regulations, Fire Safety, defines a cavity barrier as: {| |width="100%"|A construction, other than a smoke curtain, provided to close a conce..."

2017-08-16T12:01:41Z

Created page with "Approved document B of the building regulations, Fire Safety, defines a cavity barrier as: {| |width="100%"|A construction, other than a smoke curtain, provided to close a conce..."

New page

Approved document B of the building regulations, Fire Safety, defines a cavity barrier as:

{|
|width="100%"|A construction, other than a smoke curtain, provided to close a concealed space against penetration of smoke or flame, or provided to restrict the movement of smoke or flame within such a space.
|}

Where a concealed space is:

{|
|A space enclosed by elements of a building (including a suspended ceiling) or contained within an element, but not a room, cupboard, circulation space, protected shaft or space within a flue, chute, duct, pipe or conduit.
|}

= Find out more =

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

* Approved documents.
* Approved document B.
* Building regulations.
* Concealed space.
* Elements of a building.
* Fire.
* Suspended ceiling.
* Types of space.

[[Category:Regulations]] [[Category:Products_/_components]]