I dont disagree and my previous statement was not fully thought through, i meant it does not create mositure because there is not a path between inside and out, i was not aware the lights were in a bath room if they are then C may indeed be a considerationpart C is not a consideration
Resistance to moisture? In upper floors and, in particular, a bathroom that would be important.
Building Regulations England & Wales Approved Document C, Scotland Document 3, as well as the NHBC and other insurers, call for a vapour seal
between the living space and the loft space in order to prevent condensation forming on roof timbers and causing premature rotting.