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The Shawver truss—introduced in 1904 and invented by John L Shawver of Bellefontaine, Ohio—made of laminated straight boards, became a popular technique for framing gambrel roofs. This design required diagonal braces from within the roof to the floor preventing unobstructed use of both the loft and the barn. [2]
Dutch gable, gablet: A hybrid of hipped and gable with the gable (wall) at the top and hipped lower down; i.e. the opposite arrangement to the half-hipped roof. Overhanging eaves forming shelter around the building are a consequence where the gable wall is in line with the other walls of the buildings; i.e., unless the upper gable is recessed.
the front façade of the building "rises to form a parapet (upper wall) which hides most or nearly all of the roof" the roof "is almost always a front gable, though gambrel and bowed roofs are occasionally found" "a better grade of materials is often used on the façade than on the sides or rear of the building" and
Gable roof A form of gable roof (Käsbissendach) on the tower of the church in Hopfen am See, Bavaria. 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.
An A-frame building has framing with little or no walls, the rafters join at the ridge forming an A shape. This is the simplest type of framing but has historically been used for inexpensive cottages and farm shelters until the A-frame house was popularized in the 1950s as a style of vacation home in the United States.
These barns are easier to add on to by adding more bays. The New England barn almost always has a gable roof, but a gambrel roof form may be found on some New England barns. Sometimes the New England barn is framed with studs in the walls and horizontal sheathing boards instead of the more common rails with vertical sheathing.
A view of a roof using common purlin framing. The purlins are marked in red. This view is from the inside of the building, below the roof. The rafters are the beams of wood angled upward from the ground. They meet at the top of the gable at a ridge beam, which has extra bracing to attach it to the rafters.
The simplest form of roof framing is a common rafter roof. This roof framing has nothing but rafters and a tie beam at the bottoms of the rafters. The next step in the development of roof framing was to add a collar, called a collar beam roof. Collar beam roofs are suitable for spans up to around (4.5 meters). [5]