Joist - Revision history

Editor at 16:32, 10 February 2022

2022-02-10T16:32:11Z

← Older revision		Revision as of 16:32, 10 February 2022
Line 30:		Line 30:
	* Raised floor.		* Raised floor.
	* Sistering floor joists.		* Sistering floor joists.
		+	* Strut.
	* Suspended ceiling.		* Suspended ceiling.
	* Thin webbed joists.		* Thin webbed joists.

Editor at 17:30, 9 February 2022

2022-02-09T17:30:11Z

← Older revision		Revision as of 17:30, 9 February 2022
Line 25:		Line 25:
	* Glulam.		* Glulam.
	* Herringbone strut.		* Herringbone strut.
		+	* Metal web joists.
	* Nogging.		* Nogging.
	* Plywood.		* Plywood.

Editor at 18:04, 8 February 2022

2022-02-08T18:04:00Z

← Older revision		Revision as of 18:04, 8 February 2022
Line 1:		Line 1:
	A joist is a structural member that spans horizontally between the foundations of a building, or between walls or structural beams. In combination with other joists it provides support for a ceiling and/or floor.		A joist is a structural member that spans horizontally between the foundations of a building, or between walls or structural beams. In combination with other joists it provides support for a ceiling and/or floor.

−	In effect, a joist it is a form of beam that typically spans relatively short distances, and is made of solid timber. Joists are often associated with small scale or domestic construction. However they can also be made of composite materials, such as engineered timber I-joists, metal web joists, and so on, which may be used as part of longer-spanning structures.	+	In effect, a joist it is a form of beam that typically spans relatively short distances, and is made of solid timber. Joists are often associated with small scale or domestic construction. However they can also be made of composite materials, such as engineered timber I-joists (or thin webbed joists), metal web joists, and so on, which may be used as part of longer-spanning structures.

	Series of parallel joists may be given additional rigidity by intermediate bracing running between and perpendicular to the joists, such as noggings (dwangs) or herringbone struts. These prevent joists twisting when loaded. For spans of between 2.5 and 4.5 m one row of bracing is needed. For spans in excess of 4.5 m two rows of bracing are required.		Series of parallel joists may be given additional rigidity by intermediate bracing running between and perpendicular to the joists, such as noggings (dwangs) or herringbone struts. These prevent joists twisting when loaded. For spans of between 2.5 and 4.5 m one row of bracing is needed. For spans in excess of 4.5 m two rows of bracing are required.
Line 13:		Line 13:
	For more information, see Bridging.		For more information, see Bridging.

−	= Related articles on Designing Buildings ~~Wiki~~ =	+	= Related articles on Designing Buildings =

	* Batten.		* Batten.
Line 30:		Line 30:
	* Sistering floor joists.		* Sistering floor joists.
	* Suspended ceiling.		* Suspended ceiling.
		+	* Thin webbed joists.
	* Timber.		* Timber.
	* Wall ties.		* Wall ties.

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

Designing Buildings at 06:20, 10 October 2020

2020-10-10T06:20:50Z

← Older revision		Revision as of 06:20, 10 October 2020
Line 33:		Line 33:
	* Wall ties.		* Wall ties.

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

Designing Buildings at 09:04, 18 September 2020

2020-09-18T09:04:10Z

← Older revision		Revision as of 09:04, 18 September 2020
Line 12:		Line 12:

	For more information, see Bridging.		For more information, see Bridging.
−
−	~~{{:Keystone_cta_setup}}~~

	= Related articles on Designing Buildings Wiki =		= Related articles on Designing Buildings Wiki =
Line 35:		Line 33:
	* Wall ties.		* Wall ties.

−	[[Category:~~Products_/_components~~]] [[Category:~~DCN_Product_Knowledge~~]]	+	[[Category:DCN_Product_Knowledge]] [[Category:Products_/_components]]

Designing Buildings at 08:45, 17 August 2020

2020-08-17T08:45:56Z

← Older revision		Revision as of 08:45, 17 August 2020
Line 13:		Line 13:
	For more information, see Bridging.		For more information, see Bridging.

−	~~= Find out more =~~	+	{{:Keystone_cta_setup}}

−	=== Related articles on Designing Buildings Wiki ===	+	= Related articles on Designing Buildings Wiki =

	* Batten.		* Batten.
Line 35:		Line 35:
	* Wall ties.		* Wall ties.

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

Editor: Reverted edits by 194.80.20.151 (talk) to last revision by Editor

2018-09-27T13:43:04Z

Reverted edits by 194.80.20.151 (talk) to last revision by Editor

← Older revision		Revision as of 13:43, 27 September 2018
Line 5:		Line 5:
	Series of parallel joists may be given additional rigidity by intermediate bracing running between and perpendicular to the joists, such as noggings (dwangs) or herringbone struts. These prevent joists twisting when loaded. For spans of between 2.5 and 4.5 m one row of bracing is needed. For spans in excess of 4.5 m two rows of bracing are required.		Series of parallel joists may be given additional rigidity by intermediate bracing running between and perpendicular to the joists, such as noggings (dwangs) or herringbone struts. These prevent joists twisting when loaded. For spans of between 2.5 and 4.5 m one row of bracing is needed. For spans in excess of 4.5 m two rows of bracing are required.

−	Holes or notches may need to be made in joists ~~gayso~~ that pipes, wiring and so on can be run through them. This can be done in domestic properties without significantly weakening the joist if notches are within the top 12.5% of the joist and between 7% and 25% of the span (measured from either end). Holes should be within the middle 25% of the depth of the joist, and between 25% and 40% of the span. Adjacent holes should be at least twice their diameter apart and not within 100 mm of a notch. Where more complex structures are involved, or if the joists are more than 250 mm deep, the advice of a structural engineer is required.	+	Holes or notches may need to be made in joists so that pipes, wiring and so on can be run through them. This can be done in domestic properties without significantly weakening the joist if notches are within the top 12.5% of the joist and between 7% and 25% of the span (measured from either end). Holes should be within the middle 25% of the depth of the joist, and between 25% and 40% of the span. Adjacent holes should be at least twice their diameter apart and not within 100 mm of a notch. Where more complex structures are involved, or if the joists are more than 250 mm deep, the advice of a structural engineer is required.

	Joists may be connected to the supporting structure at their ends using traditional carpentry joints, or they may be placed into pockets, or they may be fixed using hangers, straps or other connectors. The use of hangers rather than pockets in walls tends to reduce air infiltration and noise transmission.		Joists may be connected to the supporting structure at their ends using traditional carpentry joints, or they may be placed into pockets, or they may be fixed using hangers, straps or other connectors. The use of hangers rather than pockets in walls tends to reduce air infiltration and noise transmission.

194.80.20.151 at 11:45, 27 September 2018

2018-09-27T11:45:05Z

← Older revision		Revision as of 11:45, 27 September 2018
Line 5:		Line 5:
	Series of parallel joists may be given additional rigidity by intermediate bracing running between and perpendicular to the joists, such as noggings (dwangs) or herringbone struts. These prevent joists twisting when loaded. For spans of between 2.5 and 4.5 m one row of bracing is needed. For spans in excess of 4.5 m two rows of bracing are required.		Series of parallel joists may be given additional rigidity by intermediate bracing running between and perpendicular to the joists, such as noggings (dwangs) or herringbone struts. These prevent joists twisting when loaded. For spans of between 2.5 and 4.5 m one row of bracing is needed. For spans in excess of 4.5 m two rows of bracing are required.

−	Holes or notches may need to be made in joists so that pipes, wiring and so on can be run through them. This can be done in domestic properties without significantly weakening the joist if notches are within the top 12.5% of the joist and between 7% and 25% of the span (measured from either end). Holes should be within the middle 25% of the depth of the joist, and between 25% and 40% of the span. Adjacent holes should be at least twice their diameter apart and not within 100 mm of a notch. Where more complex structures are involved, or if the joists are more than 250 mm deep, the advice of a structural engineer is required.	+	Holes or notches may need to be made in joists gayso that pipes, wiring and so on can be run through them. This can be done in domestic properties without significantly weakening the joist if notches are within the top 12.5% of the joist and between 7% and 25% of the span (measured from either end). Holes should be within the middle 25% of the depth of the joist, and between 25% and 40% of the span. Adjacent holes should be at least twice their diameter apart and not within 100 mm of a notch. Where more complex structures are involved, or if the joists are more than 250 mm deep, the advice of a structural engineer is required.

	Joists may be connected to the supporting structure at their ends using traditional carpentry joints, or they may be placed into pockets, or they may be fixed using hangers, straps or other connectors. The use of hangers rather than pockets in walls tends to reduce air infiltration and noise transmission.		Joists may be connected to the supporting structure at their ends using traditional carpentry joints, or they may be placed into pockets, or they may be fixed using hangers, straps or other connectors. The use of hangers rather than pockets in walls tends to reduce air infiltration and noise transmission.

Editor at 15:36, 5 April 2018

2018-04-05T15:36:58Z

← Older revision		Revision as of 15:36, 5 April 2018
Line 10:		Line 10:

	A common problem in older dwellings is that floors sag or feel ‘springy’. This can be because the joists are undersized (particularly where older buildings are converted for modern uses where they may be subject to higher loads than was originally intended), or they have been weakened by decay or by having holes or notches cut through them incorrectly. Joists can be strengthened, by 'sistering' steel, timber or ply reinforcing joists to the side of the existing joists.		A common problem in older dwellings is that floors sag or feel ‘springy’. This can be because the joists are undersized (particularly where older buildings are converted for modern uses where they may be subject to higher loads than was originally intended), or they have been weakened by decay or by having holes or notches cut through them incorrectly. Joists can be strengthened, by 'sistering' steel, timber or ply reinforcing joists to the side of the existing joists.
		+
		+	For more information, see Bridging.

	= Find out more =		= Find out more =
Line 17:		Line 19:
	* Batten.		* Batten.
	* Brander.		* Brander.
		+	* Bridging.
	* Chip carving.		* Chip carving.
	* Cross-laminated timber.		* Cross-laminated timber.

Editor at 15:10, 5 April 2018

2018-04-05T15:10:42Z

← Older revision		Revision as of 15:10, 5 April 2018
Line 1:		Line 1:
−	A joist is a structural member that spans horizontally between the foundations of a building, or between walls or structural beams. In combination with other joists it provides support for a ceiling and / or floor.	+	A joist is a structural member that spans horizontally between the foundations of a building, or between walls or structural beams. In combination with other joists it provides support for a ceiling and/or floor.

−	In effect, a joist it is a form of beam that typically spans relatively short distances, and is made of solid timber. Joists are often associated with small scale or domestic construction. However they can also be made of composite materials, such as engineered timber I joists, metal web joists and so on which may be used as part of longer-spanning structures.	+	In effect, a joist it is a form of beam that typically spans relatively short distances, and is made of solid timber. Joists are often associated with small scale or domestic construction. However they can also be made of composite materials, such as engineered timber I-joists, metal web joists, and so on, which may be used as part of longer-spanning structures.

	Series of parallel joists may be given additional rigidity by intermediate bracing running between and perpendicular to the joists, such as noggings (dwangs) or herringbone struts. These prevent joists twisting when loaded. For spans of between 2.5 and 4.5 m one row of bracing is needed. For spans in excess of 4.5 m two rows of bracing are required.		Series of parallel joists may be given additional rigidity by intermediate bracing running between and perpendicular to the joists, such as noggings (dwangs) or herringbone struts. These prevent joists twisting when loaded. For spans of between 2.5 and 4.5 m one row of bracing is needed. For spans in excess of 4.5 m two rows of bracing are required.