I would use care modifying a truss or trusses in place, they are not too forgiving in that department, but sounds like a minor change, that black soot sure tells the story though don't it.
I can tell you that the S.S. flex pipe does glow (dull orange) very easily, or so the short section I installed through my foundation to the flue of an exterior chimney. My particular stove will roar with minimal amounts of real dry wood, I'm talking a couple of 3"-4" logs especially when you first start a fire. As I recall, the black smoke pipe that it replaced took longer to get that hot. The 90 deg turn is not far from the stove, so the flames probably go right up, have to use care and apply the damper, cut off the air in the front, I covered the horizontal section with an unused smoke pipe, not crimped, and 2 angle iron chocks to maintain air space, a heat shield if you will, so if it does get hot, the heat is dispersed. Just an observation about that flex pipe. I do know of a potential good material that may be used in assemblies like these, Roxul Mineral Wool insulation, not sure if there is a UL rated assembly for what you describe or similar applicable lab tested assembly, I think I would be looking more at double wall pipe or something you know is acceptable, now I suppose if that flex pipe was used and there was a hot fire, and it did get glowing, how does the clay flue liner react with a crack, if it was not cracked would not be an issue, that flex pipe can glow quickly if set up like mine is, and it does go through concrete, 4 feet of masonry before the clay flue, I get a pretty good draft, she pulls that air right in, just an observation though.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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