BREATHER membranes play a key role within the building envelope. They facilitate the release of excess moisture vapour into the exterior, helping to keep internal wall roofing structures dry and protect the condition of insulation layers. They can also serve a valuable purpose as a line of defence against water penetration during the construction stage and the lifetime of the completed building. However, the importance of this function – and the level of performance required to fulfil it – can depend on a variety of factors.

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