September 13, 20215 yr I'm finishing off a faux chimney breast stud work around a RSJ, and a little unsure where best to place the vapour barrier. The whole RSJ is within the internal/warm side fo the building, however it is against PIR on a external wall. The existing PIR external wall had a vapour barrier upon it, which was removed along with plasterboard. I was going to reinstate the vapour barrier behind the new plasterboard, which would place the RSJ, Rockwool AMW 60 insulation on the external side of the vapour barrier. The faux chimney breast cavity and RSJ will be sat on a screed floor with UFH buried within.
September 13, 20215 yr In this instance I can’t see it making much difference, but reckon I would reinstate in its original location
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