Damp proof membrane DPM - Revision history

Designing Buildings at 10:13, 19 January 2023

2023-01-19T10:13:06Z

← Older revision		Revision as of 10:13, 19 January 2023
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		+	[[File:Damp proof course and membrane.jpg]]
		+
		+	= What problems does damp cause in buildings? =
		+
	Damp in buildings can cause a number of serious problems, such as:		Damp in buildings can cause a number of serious problems, such as:

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	* Poor performance of insulation.		* Poor performance of insulation.
	* Damage to equipment, or electrical failure.		* Damage to equipment, or electrical failure.
		+
		+	= What are the causes of damp in buildings? =

	The most common causes of persistent damp in buildings are:		The most common causes of persistent damp in buildings are:
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	* Penetrating damp.		* Penetrating damp.
	* Rising damp.		* Rising damp.
		+
		+	= What regulates the requirement for a damp proof membrane? =

	Approved document C, Site preparation and resistance to contaminants and moisture, requires that (where appropriate) floors next to the ground should:		Approved document C, Site preparation and resistance to contaminants and moisture, requires that (where appropriate) floors next to the ground should:
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	* Should not promote surface condensation or mould growth.		* Should not promote surface condensation or mould growth.

−	A damp-proof membrane (DPM) is a membrane material applied to prevent moisture transmission. Typically, a DPM is a polyethylene sheet laid under a concrete slab to prevent the concrete from gaining moisture through capillary action.	+	= What is a damp proof membrane? =

−	~~The approved document suggests that a ground-supported floor will meet these requirements if the ground~~ is ~~covered with dense concrete laid on~~ a ~~hardcore bed and~~ a ~~DPM is provided. It suggests that the~~ damp proof membrane ~~may be above or below~~ the concrete~~, and continuous with~~ the ~~damp proof courses (DPC) in walls, piers, and so on~~.	+	A damp proof membrane (DPM) is a thin, sheet material used to prevent moisture transmission. Typically, a damp proof membrane is a polyethylene sheet laid under a concrete slab to prevent the concrete from gaining moisture from the ground by capillary action.

−	~~[[File:Damp_proof_course_and_membrane~~.~~jpg\|link=File:Damp_proof_course_and_membrane~~.~~jpg]]~~	+	The approved document suggests that a ground-supported floor will meet these requirements if the ground is covered with dense concrete laid on a hardcore bed and a damp proof membrane is provided. It suggests that the damp proof membrane may be above or below the concrete, and continuous with the damp proof courses (DPCs) in walls, piers, and other structures.

	If the ground could contain water soluble sulphates, or there is any risk that sulphate or other deleterious matter could contaminate the hardcore, the membrane should be placed at the base of the concrete slab.		If the ground could contain water soluble sulphates, or there is any risk that sulphate or other deleterious matter could contaminate the hardcore, the membrane should be placed at the base of the concrete slab.
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	In order to resist degradation, insulation placed below the damp proof membrane should have low water absorption. If necessary the insulant should be resistant to contaminants in the ground.		In order to resist degradation, insulation placed below the damp proof membrane should have low water absorption. If necessary the insulant should be resistant to contaminants in the ground.

−	A timber floor finish laid directly on concrete may be bedded in a material which may also serve as a damp-proof ~~membrane~~. Timber fillets laid in the concrete as a fixing for a floor finish should be treated with an effective preservative unless they are above the damp-proof membrane.	+	A timber floor finish laid directly on concrete may be bedded in a material which may also serve as a damp-proof layer. Timber fillets laid in the concrete as a fixing for a floor finish should be treated with an effective preservative unless they are above the damp-proof membrane.

	= Related articles on Designing Buildings =		= Related articles on Designing Buildings =
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	* Cavity tray.		* Cavity tray.
	* Chemical injected DPC.		* Chemical injected DPC.
−	* Condensation.
	* Damp.		* Damp.
	* Damp proof course.		* Damp proof course.
	* Damp proofing.		* Damp proofing.
−	* Defects in brickwork
−	* Defects in stonework.
	* Does damp proofing work?		* Does damp proofing work?
	* Dew point.		* Dew point.
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	* Insulation.		* Insulation.
	* Interstitial condensation.		* Interstitial condensation.
−	* Lintel.
	* Penetrating damp.		* Penetrating damp.
	* Polyethylene.		* Polyethylene.
	* Rising damp.		* Rising damp.
−	* Screed.
	* Types of damp-proof courses.		* Types of damp-proof courses.
	* Vapour barrier.		* Vapour barrier.

	[[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]]

Editor at 17:08, 14 December 2021

2021-12-14T17:08:59Z

← Older revision		Revision as of 17:08, 14 December 2021
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	A timber floor finish laid directly on concrete may be bedded in a material which may also serve as a damp-proof membrane. Timber fillets laid in the concrete as a fixing for a floor finish should be treated with an effective preservative unless they are above the damp-proof membrane.		A timber floor finish laid directly on concrete may be bedded in a material which may also serve as a damp-proof membrane. Timber fillets laid in the concrete as a fixing for a floor finish should be treated with an effective preservative unless they are above the damp-proof membrane.

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

	* Basement waterproofing.		* Basement waterproofing.
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	* Rising damp.		* Rising damp.
	* Screed.		* Screed.
		+	* Types of damp-proof courses.
	* Vapour barrier.		* Vapour barrier.

	[[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]]

Editor at 18:12, 24 March 2021

2021-03-24T18:12:32Z

← Older revision		Revision as of 18:12, 24 March 2021
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	* Defects in brickwork		* Defects in brickwork
	* Defects in stonework.		* Defects in stonework.
		+	* Does damp proofing work?
	* Dew point.		* Dew point.
	* Humidity.		* Humidity.

Designing Buildings at 13:11, 31 August 2020

2020-08-31T13:11:35Z

← Older revision		Revision as of 13:11, 31 August 2020
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	* Vapour barrier.		* Vapour barrier.

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

Editor at 18:15, 11 September 2019

2019-09-11T18:15:51Z

← Older revision		Revision as of 18:15, 11 September 2019
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	* Blinding.		* Blinding.
	* Breather membrane.		* Breather membrane.
		+	* Capillary action.
	* Cavity tray.		* Cavity tray.
	* Chemical injected DPC.		* Chemical injected DPC.
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	* Vapour barrier.		* Vapour barrier.

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

Editor at 17:32, 16 May 2019

2019-05-16T17:32:00Z

← Older revision		Revision as of 17:32, 16 May 2019
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	A timber floor finish laid directly on concrete may be bedded in a material which may also serve as a damp-proof membrane. Timber fillets laid in the concrete as a fixing for a floor finish should be treated with an effective preservative unless they are above the damp-proof membrane.		A timber floor finish laid directly on concrete may be bedded in a material which may also serve as a damp-proof membrane. Timber fillets laid in the concrete as a fixing for a floor finish should be treated with an effective preservative unless they are above the damp-proof membrane.

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

	* Basement waterproofing.		* Basement waterproofing.
		+	* Bitumen.
	* Blinding.		* Blinding.
	* Breather membrane.		* Breather membrane.

Editor at 13:54, 12 June 2018

2018-06-12T13:54:11Z

← Older revision		Revision as of 13:54, 12 June 2018
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	* Lintel.		* Lintel.
	* Penetrating damp.		* Penetrating damp.
		+	* Polyethylene.
	* Rising damp.		* Rising damp.
	* Screed.		* Screed.

Editor at 13:45, 20 April 2018

2018-04-20T13:45:02Z

← Older revision		Revision as of 13:45, 20 April 2018
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	* Damp.		* Damp.
	* Damp proof course.		* Damp proof course.
		+	* Damp proofing.
	* Defects in brickwork		* Defects in brickwork
	* Defects in stonework.		* Defects in stonework.

Editor at 13:27, 20 April 2018

2018-04-20T13:27:23Z

← Older revision		Revision as of 13:27, 20 April 2018
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	* Should not promote surface condensation or mould growth.		* Should not promote surface condensation or mould growth.

−	The approved document suggests that a ground-supported floor will meet these requirements if the ground is covered with dense concrete laid on a hardcore bed and a ~~damp proof membrane (~~DPM) is provided. It suggests that the damp proof membrane may be above or below the concrete, and continuous with the damp proof courses (DPC) in walls, piers and so on.	+	A damp-proof membrane (DPM) is a membrane material applied to prevent moisture transmission. Typically, a DPM is a polyethylene sheet laid under a concrete slab to prevent the concrete from gaining moisture through capillary action.
		+
		+	The approved document suggests that a ground-supported floor will meet these requirements if the ground is covered with dense concrete laid on a hardcore bed and a DPM is provided. It suggests that the damp proof membrane may be above or below the concrete, and continuous with the damp proof courses (DPC) in walls, piers, and so on.

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

Editor at 18:01, 24 January 2018

2018-01-24T18:01:25Z

← Older revision		Revision as of 18:01, 24 January 2018
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	* Basement waterproofing.		* Basement waterproofing.
		+	* Blinding.
	* Breather membrane.		* Breather membrane.
	* Cavity tray.		* Cavity tray.