The invention relates to a process for manufacturing a functional layer of a building shell (2), wherein the building shell (2) is a skin on the inside of the building (11) and a plurality of beams (12) with beam spans provided between the beams (12) and the skin (11) ( 14). Moreover, according to the invention, it is provided that the functional layer is applied, at least in places, by brush and / or spraying to the outer side (15) of the skin (11) and after application an airtight and / or waterproof and, in particular, vapor barrier film is formed (10 )
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