My back porch roof is collapsing. You can see in this photo how the left side is bowed down tremendously:
Obviously, I want to fix the roof and make it actually sturdy. I lifted the shingles there in the corner and discovered that much of the wood in that corner has rotted away. I don't know if it was like that before they put the siding on, but it's really bad, and I worry about it collapsing, especially when my children are playing out there.
Is it possible to save the shingles that are currently on the porch roof there and reuse them? If that's not possible/recommended, is it at least possible to only have to replace the shingles on part of the roof, as opposed to the whole thing?