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Ridge-post framing is an old type of timber framing. The ridge board of their roof is not carried by king posts based on tie beams, but the ridge posts are based on the ground work. The German term for this construction is Firstständerhaus .
There are many names for rafters depending on their location, shape, or size (see below). The earliest surviving roofs in Europe are of common rafters on a tie beam; this assembly is known as a "closed couple". Later, principal rafters and common rafters were mixed, which is called a major/minor or primary/secondary roof system.
The sheathing boards are sometimes called the roof deck and are painted white. A purlin (or historically purline , purloyne , purling , perling ) is a longitudinal, horizontal, structural member in a roof .
The jack rafters lie in the same plane as the common rafter but connect the top plate (the wall) or ridge board to the hip or valley rafter respectively. Since the hip or valley rafter meets the ridge board and the common rafter at angles of 45 degrees, the jack rafters will have varying lengths when they intersect the hip or valley.
It was manufactured in the form of boards and panels that were 4 feet (1.2 m) wide, about 1.5 inches (3.8 cm) thick, [5] and 4 feet (1.2 m) to 12 feet (3.7 m) long. [6] These boards did not need to be painted and were delivered by the manufacturer precut to the desired size.
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Boards that are laminates, wax coated, or treated for wet-strength are often more difficult to recycle. Clean cardboard ( i.e., cardboard that has not been subject to chemical coatings) "is usually worth recovering, although often the difference between the value it realizes and the cost of recovery is marginal". [ 11 ]
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