Basement waterproofing - Revision history

Editor at 17:53, 3 February 2022

2022-02-03T17:53:42Z

← Older revision		Revision as of 17:53, 3 February 2022
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	* Damp proof membrane.		* Damp proof membrane.
	* Damp proofing.		* Damp proofing.
		+	* Dehumidification.
	* Planning (Subterranean Development) Bill.		* Planning (Subterranean Development) Bill.
	* Reservoir construction.		* Reservoir construction.

Editor at 20:26, 27 January 2022

2022-01-27T20:26:33Z

← Older revision		Revision as of 20:26, 27 January 2022
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	--[[User:Property_Care_Association\|Property Care Association]]		--[[User:Property_Care_Association\|Property Care Association]]

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

	* Basement excavation.		* Basement excavation.
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	* Planning (Subterranean Development) Bill.		* Planning (Subterranean Development) Bill.
	* Reservoir construction.		* Reservoir construction.
		+	* Safe room.
	* Shotcrete technology.		* Shotcrete technology.
	* Structural waterproofing consultant.		* Structural waterproofing consultant.

Designing Buildings at 12:19, 1 October 2020

2020-10-01T12:19:34Z

← Older revision		Revision as of 12:19, 1 October 2020
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	* Tanking.		* Tanking.

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

Designing Buildings at 15:11, 28 November 2018

2018-11-28T15:11:55Z

← Older revision		Revision as of 15:11, 28 November 2018
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	--[[User:Property_Care_Association\|Property Care Association]]		--[[User:Property_Care_Association\|Property Care Association]]

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

	* Basement excavation.		* Basement excavation.
	* Basement Excavation (Restriction of Permitted Development) Bill.		* Basement Excavation (Restriction of Permitted Development) Bill.
		+	* Basement impact assessment.
	* Basement v cellar.		* Basement v cellar.
	* Basements in buildings.		* Basements in buildings.
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	* Tanking.		* Tanking.

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

Editor at 13:43, 20 April 2018

2018-04-20T13:43:38Z

← Older revision		Revision as of 13:43, 20 April 2018
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	Where water tables are low, it can be shown that for Grades 1, 2 & 3, the internal vapour pressure is usually higher than the vapour pressure in the ground. In other words, water vapour will tend to move out of the basement, not into it. It is only with Grade 4 that internal vapour pressure will usually be less than that of the ground, and then the difference in pressure is so small that vapour movement will be negligible.		Where water tables are low, it can be shown that for Grades 1, 2 & 3, the internal vapour pressure is usually higher than the vapour pressure in the ground. In other words, water vapour will tend to move out of the basement, not into it. It is only with Grade 4 that internal vapour pressure will usually be less than that of the ground, and then the difference in pressure is so small that vapour movement will be negligible.

−	When water tables are high (BS 8102 says that for basements in excess of 4m deep we must assume water tables to be 1m below ground level) water vapour will penetrate, but at such a low rate as to be of no significance. For example, it can be shown that a Type B structure, 10 m x 10 m x 3 m, 300 mm thick, under a 10 m head of water and at 15°C internal temperature, will allow vapour penetration at such a rate as to increase relative humidity by 1.5% in 24 hours, assuming that the humidity is not removed during that time period. (Cementitious waterproofing systems allow vapour in at an even lower rate.)	+	When water tables are high (BS 8102 says that for basements in excess of 4 m deep we must assume water tables to be 1 m below ground level), water vapour will penetrate, but at such a low rate as to be of no significance. For example, it can be shown that a Type B structure, 10 m x 10 m x 3 m, 300 mm thick, under a 10 m head of water and at 15°C internal temperature, will allow vapour penetration at such a rate as to increase relative humidity by 1.5% in 24 hours, assuming that the humidity is not removed during that time period. (Cementitious waterproofing systems allow vapour in at an even lower rate.)

	Clearly, since building regulations require that air is removed several times an hour, this vapour penetration is of no consequence.		Clearly, since building regulations require that air is removed several times an hour, this vapour penetration is of no consequence.
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	* Damp in buildings.		* Damp in buildings.
	* Damp proof membrane.		* Damp proof membrane.
		+	* Damp proofing.
	* Planning (Subterranean Development) Bill.		* Planning (Subterranean Development) Bill.
	* Reservoir construction.		* Reservoir construction.

Editor at 13:41, 15 March 2018

2018-03-15T13:41:08Z

← Older revision		Revision as of 13:41, 15 March 2018
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	* Structural waterproofing consultant.		* Structural waterproofing consultant.
	* Substructure.		* Substructure.
		+	* Tanking.

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

Editor at 14:54, 5 March 2018

2018-03-05T14:54:25Z

← Older revision		Revision as of 14:54, 5 March 2018
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	{\|		{\|
−	\|GRADE	+	\| GRADE
−	\|BASEMENT USAGE	+	\| BASEMENT USAGE
−	\|PERFORMANCE LEVEL	+	\| PERFORMANCE LEVEL
	\|-		\|-
−	\|1	+	\| 1
−	\|Car parking; plant rooms (excluding electrical equipment): workshops	+	\| Car parking; plant rooms (excluding electrical equipment): workshops
−	\|Some seepage and damp patches tolerable	+	\| Some seepage and damp patches tolerable
	\|-		\|-
−	\|2	+	\| 2
−	\|Workshops and plant rooms requiring drier environment; retail storage areas	+	\| Workshops and plant rooms requiring drier environment; retail storage areas
−	\|No water penetration but moisture vapour tolerable	+	\| No water penetration but moisture vapour tolerable
	\|-		\|-
−	\|3	+	\| 3
−	\|Ventilated residential and working areas. including offices,restaurants, leisure centres, etc	+	\| Ventilated residential and working areas. including offices,restaurants, leisure centres, etc
−	\|Dry environment	+	\| Dry environment
	\|-		\|-
−	\|4	+	\| 4
−	\|Archives and stores requiring controlled environment	+	\| Archives and stores requiring controlled environment
−	\|Totally dry environment	+	\| Totally dry environment
	\|}		\|}

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	[[File:Basements1.jpg\|link=File:Basements1.jpg]]		[[File:Basements1.jpg\|link=File:Basements1.jpg]]

−	Above: Type A structures - tanked protection	+	[Above: Type A structures - tanked protection]

	Type B (structurally integral protection) structures require the structure itself to be constructed as an integral water-resistant shell. They will usually be constructed out of reinforced concrete to an appropriate design code such as BS 8110 or BS 8007, which gives guidance on the grade of concrete to be used and the steel spacing.		Type B (structurally integral protection) structures require the structure itself to be constructed as an integral water-resistant shell. They will usually be constructed out of reinforced concrete to an appropriate design code such as BS 8110 or BS 8007, which gives guidance on the grade of concrete to be used and the steel spacing.
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	[[File:Basements2.jpg\|link=File:Basements2.jpg]]		[[File:Basements2.jpg\|link=File:Basements2.jpg]]

−	Above: Type B structures - structurally integral protection	+	[Above: Type B structures - structurally integral protection]

	Type C (drained protection) structures incorporate a drained cavity within the basement structure. There is permanent reliance on the cavity to collect groundwater entering through the fabric of the structure, and direct it to drains or a sump for removal by drainage or pumping.		Type C (drained protection) structures incorporate a drained cavity within the basement structure. There is permanent reliance on the cavity to collect groundwater entering through the fabric of the structure, and direct it to drains or a sump for removal by drainage or pumping.
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	[[File:Basements3.jpg\|link=File:Basements3.jpg]]		[[File:Basements3.jpg\|link=File:Basements3.jpg]]

−	Above: Type C structures - drained protection	+	[Above: Type C structures - drained protection]

	= Existing ground conditions =		= Existing ground conditions =
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	* Reservoir construction.		* Reservoir construction.
	* Shotcrete technology.		* Shotcrete technology.
		+	* Structural waterproofing consultant.
	* Substructure.		* Substructure.

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

Editor at 14:29, 21 June 2017

2017-06-21T14:29:46Z

← Older revision		Revision as of 14:29, 21 June 2017
Line 269:		Line 269:
	* Planning (Subterranean Development) Bill.		* Planning (Subterranean Development) Bill.
	* Reservoir construction.		* Reservoir construction.
		+	* Shotcrete technology.
	* Substructure.		* Substructure.

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

Editor at 10:18, 22 September 2016

2016-09-22T10:18:38Z

← Older revision		Revision as of 10:18, 22 September 2016
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	=== Basement performance levels ===		=== Basement performance levels ===

−	Table 1 of BS 8102: ~~1990~~ (Code of ~~Practice~~ for ~~Protection~~ of ~~Structures~~ against ~~Water~~ from the ~~Ground~~) defines performance levels for the dryness of buildings in four grades, as follows:	+	Table 1 of BS 8102:2009 (Code of practice for protection of below ground structures against water from the ground) defines performance levels for the dryness of buildings in four grades, as follows:

	{\|		{\|

Editor at 14:50, 21 September 2016

2016-09-21T14:50:48Z

← Older revision		Revision as of 14:50, 21 September 2016
Line 268:		Line 268:
	* Damp proof membrane.		* Damp proof membrane.
	* Planning (Subterranean Development) Bill.		* Planning (Subterranean Development) Bill.
		+	* Reservoir construction.
	* Substructure.		* Substructure.

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