Air and vapour control layer
Assessing risks in insulation retrofits using hygrothermal software tools, Heat and moisture transport in internally insulated stone walls, by Joseph Little, Calina Ferraro & Beñat Arregi, published by Historic Environment Scotland in 2015, defines an air and vapour control layer (AVCL) as a: ‘Membrane or layer of a building component that limits air and vapour movement. It must be continuous to be effective.’
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