saddle joint
noun1
In sheet-metal roofing, a joint formed by bending up the edge of a sheet and folding it downward over the turned-up edge of the next sheet.
noun — 2 senses
In sheet-metal roofing, a joint formed by bending up the edge of a sheet and folding it downward over the turned-up edge of the next sheet.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.