Can you run plumbing in exterior walls?
I am looking to finish a bathroom in my basement and would like to know if plumbing supply lines must always be run through interior partition walls or can they be brought to exterior basement walls that have been insulated using EPS + wood stud + mineral wool?
The interior basement walls have been insulated with 2" of EPS (R-10) and then wood studs constructed against the eps and filled with mineral wool insulation (R-14). Can plumbing supply lines be run to this wall assemble and down through the wood framing that is part of the exterior wall?
Does this go against the plumbing code or do I have enough insulation with the 2” of eps (and some of the mineral wool) to safely prevent any pipes from freezing? Should the pipes also be wrapped and insulated to assist with condensation?