The seam is where both problems live
Roof-to-wall. Window-to-WRB. Deck-to-band-board. Every one of those is simultaneously a construction detail and a contractual boundary. When the roofer, the siding crew, and the window installer each own one side of a detail, nobody owns the detail itself.
That's why the same three locations generate most warranty callbacks, and why they also generate the most rework days on a schedule.





