Repointing masonry - Revision history

Editor at 13:43, 26 October 2021

2021-10-26T13:43:23Z

← Older revision		Revision as of 13:43, 26 October 2021
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	Mortar can applied slightly protruding from flush face of the masonry until it begins to harden and then any excess can be scraped off. The profile of the mortar joint (pointing) can be varied depending on exposure or to create a specific visual effect. The most common profiles are; flush (rag joint), bucket handle, weather struck, weather struck and cut, and recessed.		Mortar can applied slightly protruding from flush face of the masonry until it begins to harden and then any excess can be scraped off. The profile of the mortar joint (pointing) can be varied depending on exposure or to create a specific visual effect. The most common profiles are; flush (rag joint), bucket handle, weather struck, weather struck and cut, and recessed.

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

	* Cement mortar.		* Cement mortar.
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	* Efflorescence.		* Efflorescence.
	* How to clean masonry.		* How to clean masonry.
		+	* Hungry joints.
	* Mortar.		* Mortar.
	* Pointing.		* Pointing.
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	* Why do buildings crack? (DG 361).		* Why do buildings crack? (DG 361).

−	[[Category:~~Conservation~~]] [[Category:~~DCN_Guidance~~]] [[Category:~~Construction_techniques~~]]	+	[[Category:DCN_Guidance]] [[Category:Construction_techniques]] [[Category:Conservation]]

Designing Buildings at 06:51, 3 December 2020

2020-12-03T06:51:57Z

← Older revision		Revision as of 06:51, 3 December 2020
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	* Why do buildings crack? (DG 361).		* Why do buildings crack? (DG 361).

−	[[Category:Conservation]] [[Category:Construction_techniques]]	+	[[Category:Conservation]] [[Category:DCN_Guidance]] [[Category:Construction_techniques]]

Designing Buildings at 10:35, 7 October 2019

2019-10-07T10:35:28Z

← Older revision		Revision as of 10:35, 7 October 2019
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	Mortar can applied slightly protruding from flush face of the masonry until it begins to harden and then any excess can be scraped off. The profile of the mortar joint (pointing) can be varied depending on exposure or to create a specific visual effect. The most common profiles are; flush (rag joint), bucket handle, weather struck, weather struck and cut, and recessed.		Mortar can applied slightly protruding from flush face of the masonry until it begins to harden and then any excess can be scraped off. The profile of the mortar joint (pointing) can be varied depending on exposure or to create a specific visual effect. The most common profiles are; flush (rag joint), bucket handle, weather struck, weather struck and cut, and recessed.

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

		+	* Cement mortar.
	* Cracking and building movement.		* Cracking and building movement.
	* Defects in brickwork.		* Defects in brickwork.

Designing Buildings: moved Repointing to Repointing masonry

2018-06-16T08:43:51Z

moved Repointing to Repointing masonry

← Older revision

Revision as of 08:43, 16 June 2018

Editor at 12:00, 16 May 2018

2018-05-16T12:00:45Z

← Older revision		Revision as of 12:00, 16 May 2018
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−	[[File:~~Cement mortar and sandstone~~.JPG]]	+	[[File:Cement_mortar_and_sandstone.JPG\|link=File:Cement_mortar_and_sandstone.JPG]]

	Repointing is a construction technique used in the maintenance of masonry structures. The ‘pointing’ is the external, i.e. visible, edge of mortar joints between masonry units which are typically 10 mm-wide.		Repointing is a construction technique used in the maintenance of masonry structures. The ‘pointing’ is the external, i.e. visible, edge of mortar joints between masonry units which are typically 10 mm-wide.
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	* How to clean masonry.		* How to clean masonry.
	* Mortar.		* Mortar.
		+	* Pointing.
	* Preventing wall collapse.		* Preventing wall collapse.
	* Remedial works.		* Remedial works.

Designing Buildings at 10:30, 15 May 2018

2018-05-15T10:30:21Z

← Older revision		Revision as of 10:30, 15 May 2018
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−	~~Repointing is a construction technique that is often used in the maintenance of masonry structures. The ‘pointing’ is the external, i.e. visible, edge of~~ mortar ~~joints between masonry units which are typically 10 mm-wide. Since these joints can decay over time, due to weathering, frost damage,~~ and ~~so on, repointing is undertaken to renew them~~.	+	[[File:Cement mortar and sandstone.JPG]]

−	~~Pointing on older buildings was often made~~ of ~~lime mortar which~~, ~~compared to harder cement pointing typically used today~~, ~~may feel soft or powdery, but this does not mean that it needs to be repointed. Only where~~ joints ~~are badly eroded such that voids have formed~~ which are ~~at risk of rainwater making them much worse, will they need repointing~~.	+	Repointing is a construction technique used in the maintenance of masonry structures. The ‘pointing’ is the external, i.e. visible, edge of mortar joints between masonry units which are typically 10 mm-wide.

−	~~Masonry~~ structures ~~in exposed locations tend to be at more risk of weathering than in other locations. Due to variances in exposure~~, it ~~can be the case that only small patches of masonry will require repointing as opposed~~ to the ~~whole structure~~. ~~Regardless of the extent of the repointing~~, it is ~~important that~~ it ~~should resemble the original as closely as possible~~, ~~as otherwise the newer pointing can clash with~~ the ~~old~~.	+	When masonry structures are first constructed, mortar is applied as a thick paste which sets hard as it cures, creating a tight seal between bricks and blocks to prevent air and moisture entering into the construction. It can compensate for variations in brick or bock size to produce an aesthetically-pleasing and structurally-sound construction. However, generally, mortar is structurally weaker than the blocks or bricks it bonds, creating a sacrificial layer that is more easily repaired than defects would be in the bricks or blocks themselves.

−	~~The process of repointing begins with preparation of the masonry by raking out the defective~~ mortar to ~~a depth of at least 20 mm~~. ~~The joint should then be dampened with a fine water spray before fresh mortar~~ is ~~applied~~ to the back of the joint using a pointing tool. The type of mortar to be used should be slightly weaker than that of the surrounding masonry; usually a 4:1 sand/cement mix. For softer brick or stone walls, weaker lime mortar can be used.	+	As a result, mortar joints can decay over time, due to weathering, frost damage, and so on. When this happens, repointing is undertaken to renew them.

−	It can be ~~left~~ slightly ~~above~~ the flush ~~level~~ until it begins to harden and then excess can be scraped off ~~to leave the joint flush~~. The ~~repointing should~~ be ~~left~~ to ~~dry covered with damp hessian sheets to prevent drying out too quickly~~ and ~~cracks appearing~~.	+	Pointing on older buildings was often made of lime mortar which, compared to harder cement pointing typically used today, may feel soft or powdery, but this does not mean that it needs to be repointed. Only where joints are badly eroded such that voids have formed which are at risk of rainwater and ice making them progressively worse, will they need repointing. In this case it is important that a similar mortar is used, to prevent erosion of the masonry itself (see the image at the top of the page and see: Lime mortar for more information).
		+
		+	Masonry structures in exposed locations tend to be at more risk of weathering than in other locations. Due to variances in exposure, it may only be small patches of masonry that require repointing as opposed to the whole structure. Regardless of the extent of the repointing, it is important that it should resemble the original (both in type, texture, surface profile and colour) as closely as possible, as otherwise the newer pointing can clash with the old.
		+
		+	The process of repointing begins with preparation of the masonry by raking out the defective mortar to a depth of at least 20 mm. The joint should then be dampened with a fine water spray before fresh mortar is applied to the back of the joint using a pointing tool. The type of mortar to be used should be slightly weaker than that of the surrounding masonry; usually (but not always) a 4:1 sand/cement mix. For softer masonry (such as some sandstones), a 'weaker' lime mortar can be used.
		+
		+	For more information see: Mortar.
		+
		+	Mortar can applied slightly protruding from flush face of the masonry until it begins to harden and then any excess can be scraped off. The profile of the mortar joint (pointing) can be varied depending on exposure or to create a specific visual effect. The most common profiles are; flush (rag joint), bucket handle, weather struck, weather struck and cut, and recessed.

	= Find out more =		= Find out more =

Editor: Created page with "Repointing is a construction technique that is often used in the maintenance of masonry structures. The ‘pointing’ is the external, i.e. visible, edge of mortar joints betwee..."

2018-05-08T14:20:23Z

Created page with "Repointing is a construction technique that is often used in the maintenance of masonry structures. The ‘pointing’ is the external, i.e. visible, edge of mortar joints betwee..."

New page

Repointing is a construction technique that is often used in the maintenance of masonry structures. The ‘pointing’ is the external, i.e. visible, edge of mortar joints between masonry units which are typically 10 mm-wide. Since these joints can decay over time, due to weathering, frost damage, and so on, repointing is undertaken to renew them.

Pointing on older buildings was often made of lime mortar which, compared to harder cement pointing typically used today, may feel soft or powdery, but this does not mean that it needs to be repointed. Only where joints are badly eroded such that voids have formed which are at risk of rainwater making them much worse, will they need repointing.

Masonry structures in exposed locations tend to be at more risk of weathering than in other locations. Due to variances in exposure, it can be the case that only small patches of masonry will require repointing as opposed to the whole structure. Regardless of the extent of the repointing, it is important that it should resemble the original as closely as possible, as otherwise the newer pointing can clash with the old.

The process of repointing begins with preparation of the masonry by raking out the defective mortar to a depth of at least 20 mm. The joint should then be dampened with a fine water spray before fresh mortar is applied to the back of the joint using a pointing tool. The type of mortar to be used should be slightly weaker than that of the surrounding masonry; usually a 4:1 sand/cement mix. For softer brick or stone walls, weaker lime mortar can be used.

It can be left slightly above the flush level until it begins to harden and then excess can be scraped off to leave the joint flush. The repointing should be left to dry covered with damp hessian sheets to prevent drying out too quickly and cracks appearing.

= Find out more =

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

* Cracking and building movement.
* Defects in brickwork.
* Defects in stonework.
* Efflorescence.
* How to clean masonry.
* Mortar.
* Preventing wall collapse.
* Remedial works.
* Spalling.
* Underpinning.
* Wall tie failure.
* Why do buildings crack? (DG 361).

[[Category:Conservation]] [[Category:Construction_techniques]]