Designing Buildings: Created page with "[https://www.historicenvironment.scot/archives-and-research/publications/publication/?publicationId=8a2a7b9d-e3b2-4c7d-8c17-a59400a8387b Assessing risks in insulation retrofits u..."

2022-07-04T11:05:52Z

Created page with "[https://www.historicenvironment.scot/archives-and-research/publications/publication/?publicationId=8a2a7b9d-e3b2-4c7d-8c17-a59400a8387b Assessing risks in insulation retrofits u..."

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[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 vapour diffusion as: ‘The movement of vapour molecules in capillaries within a component, in an attempt to equally distribute themselves and reach equilibrium. It always occurs in the direction of high vapour pressure to low vapour pressure.’

It defines vapour diffusion resistance factor (μ-value) as a: ‘Material property describing the rate of vapour diffusion in a material as compared to still air: By definition, still air has a μ-value of 1; all other materials have a μ-value greater than 1.’

= Related articles on Designing Buildings =

* Capillary action.
* Diffusion paradigm.
* Diffusion tube.
* Humidity.
* Hygroscopic.
* Hygroscopicity.
* Moisture movement.
* Reverse diffusion.
* Vapour permeability.
* Water.
* Wetting diffusivity.

[[Category:DCN_Definition]] [[Category:Definitions]] [[Category:Standards_/_measurements]]

Vapour diffusion - Revision history

Designing Buildings: Created page with "[https://www.historicenvironment.scot/archives-and-research/publications/publication/?publicationId=8a2a7b9d-e3b2-4c7d-8c17-a59400a8387b Assessing risks in insulation retrofits u..."