I'd like to install a new skylight in my dining room. The skylight is 30x30 and will require one ceiling joist to be cut and (2) new double headers to be installed. Do the new headers need to span from the uncut joists (B) or can I simply install them as bracing, between cut and uncut joists (A).
If I go with method (A), the drywall hole I cut in the ceiling is a one-time thing. If I go with method (B), I think I need to extend the cut of the drywall another 3" on each side, remove the joist section, install headers, and then add drywall to cover the headers. Make sense? (A) seems simpler to me.
All work will be done from below because attic is too small to do work from above.