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		<id>https://www.designingbuildings.co.uk/w/index.php?action=history&amp;feed=atom&amp;title=Vapour-open</id>
		<title>Vapour-open - Revision history</title>
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		<updated>2026-05-09T06:53:44Z</updated>
		<subtitle>Revision history for this page on the wiki</subtitle>
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	<entry>
		<id>https://www.designingbuildings.co.uk/w/index.php?title=Vapour-open&amp;diff=234022&amp;oldid=prev</id>
		<title>Designing Buildings: Created page with &quot;[https://www.historicenvironment.scot/archives-and-research/publications/publication/?publicationId=8a2a7b9d-e3b2-4c7d-8c17-a59400a8387b Assessing risks in insulation retrofits u...&quot;</title>
		<link rel="alternate" type="text/html" href="https://www.designingbuildings.co.uk/w/index.php?title=Vapour-open&amp;diff=234022&amp;oldid=prev"/>
				<updated>2022-07-04T11:08:49Z</updated>
		
		<summary type="html">&lt;p&gt;Created page with &amp;quot;[https://www.historicenvironment.scot/archives-and-research/publications/publication/?publicationId=8a2a7b9d-e3b2-4c7d-8c17-a59400a8387b Assessing risks in insulation retrofits u...&amp;quot;&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;[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-open and vapour-closed as a: ‘Qualitative description of how easily vapour can diffuse through a material. Vapour-open materials, such as mineral wool or wood fibre, have low μ-values (vapour diffusion resistance factors) and allow vapour diffusion to occur relatively easily. Vapour-closed materials, such as a PE-membrane or foil layer, have high a vapour diffusions resistance factor (μ-value), which greatly restricts vapour diffusion.’&lt;br /&gt;
&lt;br /&gt;
= Related articles on Designing Buildings =&lt;br /&gt;
&lt;br /&gt;
* Capillary action.&lt;br /&gt;
* Diffusion paradigm.&lt;br /&gt;
* Diffusion tube.&lt;br /&gt;
* Humidity.&lt;br /&gt;
* Hygroscopic.&lt;br /&gt;
* Hygroscopicity.&lt;br /&gt;
* Moisture movement.&lt;br /&gt;
* Reverse diffusion.&lt;br /&gt;
* Vapour diffusion.&lt;br /&gt;
* Vapour permeability.&lt;br /&gt;
* Water.&lt;br /&gt;
* Wetting diffusivity.&lt;br /&gt;
&lt;br /&gt;
[[Category:DCN_Definition]] [[Category:Definitions]]&lt;/div&gt;</summary>
		<author><name>Designing Buildings</name></author>	</entry>

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