I've never heard of the fire angle. That's a new one to me that I don't believe. However, I would strip the old to remove the excess weight as others have pointed out, and replace any bad sheets of plywood. Also, one of my barns has a metal roof and has a vapor barrier between the metal and the perlins to protect the perlins from condensation that accompanies metal roofs. When I built my tool sheds, I followed suit and put a plastic barrier between the metal and the wood. A fella down the road from me also did a metal roof, and laid perlins down on top of his old roof to support the metal and keep it separate from his existing roof for ventilation and creating a moisture barrier which I think was a good idea for heat and cooling as well, but he didn't strip the old shingles first, which I would have done.
Its your roof, you can do whatever you want, but one thing is for sure, you don't want to have to go up there sooner then later after you finish, so do your homework ahead of time. Good luck.
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