They are nailed to the cut ends of rafters and prevent water from being drawn back along the overhang and inside the walls.
They dose off the underside of the rafters from nesting under eaves or getting into the attic.
Eave.
Hip.
Rake.
Ridge.
Valley.
Up to 30 years.
Roll roofing.
Base, step and cap flashing.
Prefab valley flashing.
Gutter aprons and drip edges.
Any wood showing a moisture content above 18%.
Wood shakes.
Boot.
Have a couple of tarps on hand.
Roofing shovel or pitch fork.
Use a release magnet.
With a starter strip that has cut tabs off. Put the rest of the shingle on with the cut edge overlapping the eaves and gutter apron.