How do you insulate your pipes to protect against freezing?
Something like this foam pipe insulation should do the job:



Source - UK site, but you should be able to source this in the States.

It's split down the length so you can wrap it round existing pipes. It's flexible and easily cut so you can do corners and bends too. You might need to tape it a regular intervals to keep the insulation in place if there's not a lot of room between the pipes and any walls/beams.