I suspect you need double-wall insulated pipe for everything starting below the ceiling all the way up through the roof...but I think ERBenoit's right to suggest you consult somebody closer to the scene of the action to be sure.
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Don't believe everything you know. -- Bumper sticker
Everybody is ignorant, only on different subjects. -- Will Rogers
Law of Logical Argument - Anything is possible if you don't know what you are talking about.
If at first you don't succeed, try, try, again. Then give up. There's no point in being a damn fool about it. -- W.C. Fields