Design
Aesthetic, traditional or purely decorative considerations may prevail over the strictly functional requirements of the eaves. The Arts and Crafts Movement influenced the American Craftsman tradition, which has very wide eaves with decorative brackets, for which there is not necessarily a real functional need; likewise the Italianate eaves, shown above.
The eaves may terminate in a fascia, a board running the length of the eaves under the tiles or roof sheets to cap off and protect the exposed rafter ends and to provide grounds on which to fix gutters. At the gables the eaves may extend beyond the gable end wall by projecting the purlins and are usually capped off by bargeboards to protect the wall and the purlin ends.
The underside of the eaves may be filled with a horizontal soffit fixed at right angles to the wall, the soffit may be decorative but it also has the function of sealing the gap between the rafters from vermin and weather.
Eaves must be designed for local wind speeds as the overhang can significantly increase the wind loading on the roof.
The line on the ground under the outer edge of the eaves is the eavesdrip, or dripline, and in typical building planning regulations defines the extent of the building and cannot oversail the property boundary.
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