Installing PEX in sub-zero temperatures

steveg

I am being asked by a contractor to write a note to his GC about the ambient temperature requirements for installing PEX tubing. The contractor is in Northern Canada and last winter the GC provided a heated space (0-5F) for the contractor. This year the GC said it was too expensive to provide the heat. I know the tubing can be installed in cold temperatures but how cold is cold.