I just installed a new shower where the shower head exits from the ceiling over the centre of the bathtub. Now I am nervous whether the 4 feet or so of copper pipe running along the ceiling will freeze in winter or not. The half inch copper pipe runs under R20 fibreglass insulation, about 2″ of pre-existing cellulose insulation, 1 1/2 ” of fibreboard and 1/2″ drywall, and above a new 1/2″ drywall ceiling.
This is in Ottawa, where the tempature can drop to -30 or so in the winter.
Am I okay, or should I climb into the attic with some more batts of R20?