If you have crawl spaces, unheated garages, or plumbing in other unheated areas of your home, insulate them to prevent ice buildup. You have several ways from joinuacanada.ca to isolate these pipes:

Add insulation to these areas, which can also help you save on energy bills Insulation Tape foam pipe insulation Rubber pipe insulation Foam and foil tube insulation

Whichever method you choose will depend on your budget, the difficulty of the area, and how much work you're willing to put in.