Hey all, I am getting ready to install a Drolett wood burning insert into my current fireplace, but wanted to double check a couple of things first. My current chimney is lined with 1 to 1.5 inch clay. I plan on installing a flexible chimney pipe from the insert through the chimney. My question is, do I need to line the chimney with anything first, or does the current clay setup suffice? I saw one person wrap his flexible chimney pipe with insulation, is this something I also need to do? What is the purpose of the insulation? Any help would be great, thanks.