I live in Canada and my workspace was outside; which meant I only could smash metal from May to November. Ive been working on building my Smithy (basically a pole barn) since July and it's almost done (I'll post a photos when I'm 100% done). I have a question regarding the chimney for my coal forge. I'm installing a wood stove and I know I need a insulated chimney pipe for when it goes through the metal roof. Question: Do I need insulated chimney pipe for my forge or will single wall pipe be ok? I'll be using a rivet forge with a hood and will be upgrading to a 24x30 coal forge as budget permits. Thanks!