Heating tape might be a better way to insulate water pipes in areas where winters are extreme. It is plastic coated wire to wrap around pipes, plugged into an electrical outlet to keep pipes from freezing.
Also known as a heat cable, heating tape is relatively easy to install. Different types of heating tape have distinct requirements; read and follow instructions carefully, and take necessary precautions. Also make sure to plug the tape into a properly functioning ground fault circuit interrupter (GFCI), to protect against electrical shock.