Moisture in buildings - Revision history

Designing Buildings at 07:40, 30 June 2022

2022-06-30T07:40:52Z

← Older revision		Revision as of 07:40, 30 June 2022
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	It defines moisture content as: ‘The quantity of moisture present within a material.’		It defines moisture content as: ‘The quantity of moisture present within a material.’

−	= Related articles on Designing Buildings ~~Wiki~~ =	+	[https://www.historicenvironment.scot/archives-and-research/publications/publication/?publicationId=8a2a7b9d-e3b2-4c7d-8c17-a59400a8387b Assessing risks in insulation retrofits using hygrothermal software tools, Heat and moisture transport in internally insulated stone walls], by Joseph Little, Calina Ferraro and Beñat Arregi, published by Historic Environment Scotland in 2015, defines moisture as: ‘Water in its solid, liquid or gaseous/vapour states.’
		+
		+	It defines moisture content as the: ‘Mass of water (in any state) per unit volume of a material, often ex-pressed in kilograms of water per cubic metre (kg/m3).’
		+
		+	Moisture convection as the: ‘Movement of water vapour through a space via air currents or bulk air movement (as opposed to by diffusion).’
		+
		+	And moisture diffusivity (Dw) as: ‘…the capillary transport of moisture in the liquid phase, which is the predominant moisture transport mechanism in capillary porous materials. In the context of building physics it is sufficiently accurate to regard the liquid transport in the pore spaces as a diffusion phenomenon (although it is basically a convective phenomenon). WUFI measures it through two liquid transport that depend on both material proper-ties and boundary conditions.’
		+
		+	= Related articles on Designing Buildings =

	* Cavity wall insulation.		* Cavity wall insulation.

Designing Buildings at 08:36, 29 March 2021

2021-03-29T08:36:23Z

← Older revision		Revision as of 08:36, 29 March 2021
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	* Eliminating rising damp and penetrating damp.		* Eliminating rising damp and penetrating damp.
	* Introducing moisture barriers such as vapour barriers, damp proof membranes, and so on.		* Introducing moisture barriers such as vapour barriers, damp proof membranes, and so on.
		+
		+	NB [https://www.historicenvironment.scot/archives-and-research/publications/publication/?publicationId=1122c09b-8c2b-442b-8bfd-accd0117b1ef Technical paper 35: Moisture measurement in the historic environment], published by Historic Environment Scotland in 2021, defines moisture as: ‘Water that is freely mobile as a liquid, gas (vapour), and solid (ice). All moisture is water, but not all water is moisture, as it is not necessarily freely mobile.’
		+
		+	It defines moisture content as: ‘The quantity of moisture present within a material.’

	= Related articles on Designing Buildings Wiki =		= Related articles on Designing Buildings Wiki =
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	* Insulation.		* Insulation.
	* Mould growth.		* Mould growth.
		+	* Penetrating damp.
		+	* Rising damp.
	* Types of water.		* Types of water.
	* Ventilation.		* Ventilation.

Editor at 19:10, 26 October 2020

2020-10-26T19:10:01Z

← Older revision		Revision as of 19:10, 26 October 2020
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	* Damp proofing.		* Damp proofing.
	* Dew point.		* Dew point.
		+	* Electrical resistance meters.
	* Humidity.		* Humidity.
	* Insulation.		* Insulation.
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	* Water vapour.		* Water vapour.

−	[[Category:~~Education~~]] [[Category:~~DCN_Education_and_Training~~]] [[Category:Health_and_safety_/_CDM]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Education]] [[Category:Health_and_safety_/_CDM]]

Editor at 15:53, 20 September 2018

2018-09-20T15:53:39Z

← Older revision		Revision as of 15:53, 20 September 2018
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	[[File:Condensation_on_glass.jpg\|link=File:Condensation_on_glass.jpg]]		[[File:Condensation_on_glass.jpg\|link=File:Condensation_on_glass.jpg]]

−	Moisture is the presence of water, often in small or even trace amounts. Moisture can be found in water vapour, condensation, and in or on the fabric of a building and can cause damp resulting in problems such as staining, mould growth, mildew and poor indoor air quality and so on.	+	Moisture is the presence of water, often in small or even trace amounts. Moisture can be found in water vapour, condensation, and in or on the fabric of a building and can cause damp resulting in problems such as staining, mould growth, mildew and poor indoor air quality, and so on.

	The common sources of moisture in buildings include:		The common sources of moisture in buildings include:
Line 7:		Line 7:
	* Condensation.		* Condensation.
	* Penetrating damp.		* Penetrating damp.
−	* Leakage from pipes, tanks, drains and so on.	+	* Leakage from pipes, tanks, drains, and so on.
	* Rising damp.		* Rising damp.
	* Building defect, e.g. lack of adequate roof space ventilation, faulty retrofit installation, application of paint or plaster that affects the breathability of the building element, and so on.		* Building defect, e.g. lack of adequate roof space ventilation, faulty retrofit installation, application of paint or plaster that affects the breathability of the building element, and so on.
Line 21:		Line 21:
	* Mending leaking pipes, wastes and overflows.		* Mending leaking pipes, wastes and overflows.
	* Eliminating rising damp and penetrating damp.		* Eliminating rising damp and penetrating damp.
−	* Introducing moisture barriers such as vapour barriers, damp proof membranes and so on.	+	* Introducing moisture barriers such as vapour barriers, damp proof membranes, and so on.

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

	* Cavity wall insulation.		* Cavity wall insulation.
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	* Wall insulation and moisture risk.		* Wall insulation and moisture risk.
	* Water.		* Water.
		+	* Water vapour.

−	[[Category:Education]] [[Category:Health_and_safety_/_CDM]]	+	[[Category:Education]] [[Category:DCN_Education_and_Training]] [[Category:Health_and_safety_/_CDM]]

Designing Buildings: moved Moisture to Moisture in buildings

2018-09-05T06:14:03Z

moved Moisture to Moisture in buildings

← Older revision

Revision as of 06:14, 5 September 2018

Designing Buildings at 06:13, 5 September 2018

2018-09-05T06:13:34Z

← Older revision		Revision as of 06:13, 5 September 2018
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−	[[File:~~Condensation on glass~~.jpg]]	+	[[File:Condensation_on_glass.jpg\|link=File:Condensation_on_glass.jpg]]

	Moisture is the presence of water, often in small or even trace amounts. Moisture can be found in water vapour, condensation, and in or on the fabric of a building and can cause damp resulting in problems such as staining, mould growth, mildew and poor indoor air quality and so on.		Moisture is the presence of water, often in small or even trace amounts. Moisture can be found in water vapour, condensation, and in or on the fabric of a building and can cause damp resulting in problems such as staining, mould growth, mildew and poor indoor air quality and so on.
Line 10:		Line 10:
	* Rising damp.		* Rising damp.
	* Building defect, e.g. lack of adequate roof space ventilation, faulty retrofit installation, application of paint or plaster that affects the breathability of the building element, and so on.		* Building defect, e.g. lack of adequate roof space ventilation, faulty retrofit installation, application of paint or plaster that affects the breathability of the building element, and so on.
−	* Indoor moisture sources, e.g. cooking, bathing, washing, hot tubs, indoor swimming pools, and so on.	+	* Indoor moisture sources, e.g. cooking, bathing, washing, hot tubs, indoor swimming pools, and so on..
−		+
−	It is important to understand how moisture moves within the fabric of a building to be able to predict how moisture will move after retrofitting works have been carried out. A condition survey is essential before any work to a building, and that must include a proper understanding of dampness. It is also essential that a proper investigation of dampness is carried out that focuses on the cause and not just dealing with the symptoms. For more information, see Understanding dampness.	+
−		+
−	A common method of preventing moisture problems in walls and roofs was the installation of vapour barriers. These are positioned on the warm side of the structure, preventing warm moist air from penetrating to a point where it might reach its dew point temperature, at which point the moisture it holds will begin to condense as water. In a traditional cavity wall construction for example, a vapour barrier might be introduced between the cavity insulation and the inner masonry skin.	+
−		+
−	~~For more information, see Vapour barrier~~.	+

	Moisture levels can be reduced through a number of measures:		Moisture levels can be reduced through a number of measures:
Line 27:		Line 21:
	* Mending leaking pipes, wastes and overflows.		* Mending leaking pipes, wastes and overflows.
	* Eliminating rising damp and penetrating damp.		* Eliminating rising damp and penetrating damp.
		+	* Introducing moisture barriers such as vapour barriers, damp proof membranes and so on.

	= Find out more =		= Find out more =

Designing Buildings at 06:00, 5 September 2018

2018-09-05T06:00:47Z

← Older revision		Revision as of 06:00, 5 September 2018
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−	Moisture is the presence of water, often in small or even trace amounts. Moisture can be found in water vapour and condensation which can cause damp problems in buildings and cause mould growth, mildews and general poor indoor air quality.	+	[[File:Condensation on glass.jpg]]

−	The common sources of moisture ~~ingress that can be found~~ in buildings include:	+	Moisture is the presence of water, often in small or even trace amounts. Moisture can be found in water vapour, condensation, and in or on the fabric of a building and can cause damp resulting in problems such as staining, mould growth, mildew and poor indoor air quality and so on.
		+
		+	The common sources of moisture in buildings include:

	* Condensation.		* Condensation.
	* Penetrating damp.		* Penetrating damp.
−	* Leakage from pipes, tanks or drains.	+	* Leakage from pipes, tanks, drains and so on.
	* Rising damp.		* Rising damp.
	* Building defect, e.g. lack of adequate roof space ventilation, faulty retrofit installation, application of paint or plaster that affects the breathability of the building element, and so on.		* Building defect, e.g. lack of adequate roof space ventilation, faulty retrofit installation, application of paint or plaster that affects the breathability of the building element, and so on.

Editor at 15:22, 4 September 2018

2018-09-04T15:22:16Z

← Older revision		Revision as of 15:22, 4 September 2018
Line 15:		Line 15:

	For more information, see Vapour barrier.		For more information, see Vapour barrier.
		+
		+	Moisture levels can be reduced through a number of measures:
		+
		+	* Natural or mechanical ventilation.
		+	* Use of de-humidifiers or air conditioning units.
		+	* Insulation of cold surfaces, such as pipes.
		+	* Increasing air temperature.
		+	* Removing sources of moisture such as drying clothes and ensuring vented tumble dryers are appropriately vented to the outside.
		+	* Mending leaking pipes, wastes and overflows.
		+	* Eliminating rising damp and penetrating damp.

	= Find out more =		= Find out more =

Editor at 15:16, 4 September 2018

2018-09-04T15:16:36Z

← Older revision		Revision as of 15:16, 4 September 2018
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	* Humidity.		* Humidity.
	* Insulation.		* Insulation.
		+	* Mould growth.
	* Types of water.		* Types of water.
	* Ventilation.		* Ventilation.

Editor: Created page with "Moisture is the presence of water, often in small or even trace amounts. Moisture can be found in water vapour and condensation which can cause damp problems in buildings and cau..."

2018-09-04T15:02:57Z

Created page with "Moisture is the presence of water, often in small or even trace amounts. Moisture can be found in water vapour and condensation which can cause damp problems in buildings and cau..."

New page

Moisture is the presence of water, often in small or even trace amounts. Moisture can be found in water vapour and condensation which can cause damp problems in buildings and cause mould growth, mildews and general poor indoor air quality.

The common sources of moisture ingress that can be found in buildings include:

* Condensation.
* Penetrating damp.
* Leakage from pipes, tanks or drains.
* Rising damp.
* Building defect, e.g. lack of adequate roof space ventilation, faulty retrofit installation, application of paint or plaster that affects the breathability of the building element, and so on.
* Indoor moisture sources, e.g. cooking, bathing, washing, hot tubs, indoor swimming pools, and so on.

It is important to understand how moisture moves within the fabric of a building to be able to predict how moisture will move after retrofitting works have been carried out. A condition survey is essential before any work to a building, and that must include a proper understanding of dampness. It is also essential that a proper investigation of dampness is carried out that focuses on the cause and not just dealing with the symptoms. For more information, see Understanding dampness.

A common method of preventing moisture problems in walls and roofs was the installation of vapour barriers. These are positioned on the warm side of the structure, preventing warm moist air from penetrating to a point where it might reach its dew point temperature, at which point the moisture it holds will begin to condense as water. In a traditional cavity wall construction for example, a vapour barrier might be introduced between the cavity insulation and the inner masonry skin.

For more information, see Vapour barrier.

= Find out more =

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

* Cavity wall insulation.
* Condensation.
* Damp.
* Damp proofing.
* Dew point.
* Humidity.
* Insulation.
* Types of water.
* Ventilation.
* Wall insulation and moisture risk.
* Water.

[[Category:Education]] [[Category:Health_and_safety_/_CDM]]