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Len56

wrote:

I'd say don't even finish the attic before the roof is done. And if
you do your side before the other side, depending on th style of the
building, a false wall on the top, looking like the fire-wall extends
through the roof, CAN be an attractive way to separate the 2 roof
styles. You would "step flash" both sides to keep water from getting
under the shingles at the dividing line - they would re-flash their
side when they do their roof. The wall would be capped with a metal
flashing "cap"

I think that may end up being the plan -- get the roof done now, and then
finish the attic.

What you described regarding the transition between the two attached houses
is basically what two different roofers explained to me when giving me
estimates on this job. Both also pointed examples of how the same thing had
been done on similar twin houses across the street from mine, so I could see
how the end product would look.