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A truss roof with tongue and groove sheathing. The gap in the sheathing at the ridge is the space designed to allow natural ventilation. Pre-manufactured roof trusses come in a wide variety of styles. They are designed by the manufacturer for each specific building. Timber trusses also are built in a variety of styles using wood or metal joints.
Two king post trusses linked to support a roof. Key:1: ridge beam, 2: purlins, 3: common rafters. This is an example of a "double roof" with principal rafters and common rafters. A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof.
It is built with corner post construction on the ground floor, half-timbered style of timber framing on the upper floor and has a less common style of wood roof shingles than typical in America. American historic carpentry is the historic methods with which wooden buildings were built in what is now the United States since European settlement.
Wood hangars were constructed throughout North America and employed various technologies including bowstring, Warren, and Pratt trusses, glued laminated arches, and lamella roof systems. Unique to this building type is the interlocking of the timber members of the roof trusses and supporting columns and their connection points.
The depth of the bearing seat at the ends of underslung LH- and DLH-Series Joists have been established at 5 inches (130 mm) for chord section number 2 through 17. A bearing seat depth of 7 + 1 ⁄ 2 inches (190 mm) has been established for the DLH Series chord section number 18 through 25. [1]
The staggered truss structural system consists of story-high steel trusses placed on alternating column lines on each floor so that the long axis of one truss is always between the trusses on the floor below. [4] The system staggers trusses on a 12’ module, meaning that on any given floor the trusses were 24’ apart. [2]
The parallel chord truss, or flat truss, gets its name from its parallel top and bottom chords. It is often used for floor construction. A combination of the two is a truncated truss, used in hip roof construction. A metal plate-connected wood truss is a roof or floor truss whose wood members are connected with metal connector plates.
A roof (pl.: roofs or rooves) is the top covering of a building, including all materials and constructions necessary to support it on the walls of the building or on uprights, providing protection against rain, snow, sunlight, extremes of temperature, and wind. [1]
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