Moisture movement
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 movement or moisture transfer as a: ‘Mode of transfer is very dependent on the state the moisture is in. Water can exist in the same material as a solid, a liquid and a gas in all three states simultaneously and can change state as conditions change.'
There is a fuller explanation within the document.
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