The National Weather Service is forecasting some frigid temperatures over the next several days. And when the thermometer begins to thaw, some homeowners may have an unpleasant surprise of their water pipes cracking due to the cold weather. "Some of the first things you should do, if you have foundation vents, you should block those off, so the air doesn't get down under the structure. If they are the older houses, that don't have insulation in the walls, they can leave the cabinet door open where there's plumbing underneath. They can also leave the water dripping a little bit, so the water's moving through the pipes. When it's moving it usually doesn't freeze." John Woolery with Deschutes Plumbing says some people put a space heater in their crawl space or under the sink, but he doesn't recommend that as it is a fire hazard. If you get to the pipes early enough, you can wrap them with insulating material.