So after the last rain storm, I got an unexpected skylight in my upstairs bedroom Took down what remained of the sheetrock, and found quite a mess: One of the joists as well as some of the supports/trusses/etc were rotted to hell. Managed to replace/repair the structural damage. Went onto the roof and found a similar mess. It's the original tin roof from 1915. It had been patched/cemented countless times. What initially looked like a small area of rot turned into more. After I removed all the old coatings/tar/epoxy(?), I was left with about 4 feet of totally disintegrated roof, running right at the edge. The roof is built such that the edge of the tin curls up along the brick wall. All that is gone. Surprisingly, the rest of the roof seems to be in good shape. So, I'm going to attempt to repair that section. I was going to use elastomeric coating/mesh tape, but I think I'd be better off with some actual metal underneath. The plan is to buy a patch sheet of metal and try to solder it to the existing good areas. Then I'd apply the elastomeric/mesh over it. What kind of solder do I use? Just standard plumbing solder/flux, or is there something special? Would I be better off just using sheet metal screws? Any other suggestions?