http://www.hearth.com/talk/attachments/image-jpg.127626/ I spent a long day thawing out this drain line. It's surprising to me that it's only buried 8-10 inches. Now that it's uncovered I'm wondering how best to insulate it to reduce the likelihood of it freezing again. Any suggestions on how to do this? Maybe just overlap some rigid foam insulation? And, the hole where it goes through the foundation wall is open. Should I fill this with expanding foam? Thanks for your thoughts on this.