We have had a real cold spell here (-40C and -50+C windchills)
combined with lots of snow. Several people I know have had there roof
sewer vent frost over requiring them to unplug it. Not easy at these
temperatures and with two feet of snow on the roof.
Are there ways to minimize the chance of this happening?
I had thought that maybe insulating the pipe through the attic might
help? Keep the "air" warmer.