Flashing used with external timber cladding

Flashing is a waterproof layer, used at corners, vertical joints and around openings underneath external cladding. Whereas sarking is not always used, it is essential that flashing is utilised to ensure that water is prevented from penetrating the wall frame cavity. As it does not extend fully behind the cladding, materials that are not vapour permeable may be used as flashing.

Reference: Timber Datafile FP1 – Timber External Cladding of the NAFI Timber Manual

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