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Bargeboard, 1908 illustration. A bargeboard or rake fascia is a board fastened to each projecting gable of a roof to give it strength and protection, and to conceal the otherwise exposed end grain of the horizontal timbers or purlins of the roof.
Soffit exposure profile (from wall to fascia) on a building's exterior can vary from a few centimetres (2–3 inches) to 3 feet or more, depending on construction. It can be non-ventilated or ventilated, to prevent condensation. A grill that covers the venting opening on the bottom of the soffit is called a soffit vent.
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 overhang at the gable is referred to as a gable overhang, as opposed to eave overhang, or they both may be referred to as overhang.
Barge rafter: The outermost rafter on a gable end, sometimes forming a roof overhang. Butt rafter: A smaller rafter interrupted by and joined to a butt purlin. Common rafters pass over and are supported by a principal purlin, if present. A "binding rafter" is not a rafter but an obsolete name for a purlin or support.
The gable end roof is a poor design for hurricane or tornado-prone regions. Winds blowing against the gable end can exert tremendous pressure, both on the gable and on the roof edges where they overhang it, causing the roof to peel off and the gable to cave in. [ 4 ] [ 5 ]
A gable roof [1] is a roof consisting of two sections whose upper horizontal edges meet to form its ridge. The most common roof shape in cold or temperate climates, it is constructed of rafters , roof trusses or purlins .