We need to put some plumbing up against an exterior wall. We are told this is usually avoided but we have no choice. We live in a cold climate (very cold winters in Toronto) so we want to take every precaution to ensure the pipes never burst. We were told to put up a vapour barrier, then insulation, then another vapour barrier. However, when we asked at a local home depot, the pro said that you should only have a vapour barrier on ‘warm’ side of a house or closest to the inside. But does anyone know the best way? Where would the pipes go? Does anyone have some insight? The pipes are for a shower and tub (separately). Thanks!