They are also known as gutters. They provide a method by which water that drips off the roof is caught and carried down the down spouts to an appropriate area for it to wash away.
Specifically, exposure to weather: the distance from the butt edge of one shingle to another.
The vertical edge of the cornice.
A breather-type building paper of strong, tough base saturated with asphalt.
Strips of metal or roofing material used in making watertight joints on a roof, especially in valleys or where inclined and vertical surfaces intersect. These must be laid at all points where the roof meets a wall, chimney, skylight, vents, dormer, valley or stack.
The end wall of a building which comes to a triangular point under a sloping roof; also, a type of roof.