In the context of building materials, breathability refers to the ability of a material to allow moisture vapour to pass through it. It’s an important factor in managing dampness, as materials that breathe well can help to regulate humidity levels and prevent the accumulation of moisture within the structure, which could lead to mould and other damp-related issues. For clarity, breathability is an analogy, just as capillary action is an analogy. Vapour is absorbed and released through diffusion. A wall doesn’t actually breathe.

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