Batten

In a metal roof: a metal closure set over, or covering the joint between, adjacent metal panels; or wood: a strip of wood commonly set in or over the structural deck; or in a membrane roof system: a narrow plastic, wood, or metal bar which is used to fasten or hold the roof membrane and/or base flashing in place; or in tile roof system a metal, wood, or plastic used to elevate and/or attach a roof field tile.