Barge boards are boards along the edge of a roof to cover the rafter abd keep out rain. They can be very plain, or elaborately carved and fretted.

Barge boards in Grayling Road, opposite Grazebrook School
These barge boards are quite simple but carefully shaped and the small finial sets them off.

Perforated bargeboards in a decorative stone building in Ambleside, Cumbria
The building has sandstone windows, slate walls and large stone quoins

Outbuilding at Hokam Hall, Cumbria.
Simple bargeboards and an elaborate wooden clock tower with
a belvedere from which one can look out.

Elaborate bargeboards, fretted, scalloped and chamfered. Cumbria