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Note: Truss bracing not shown for clarity. 1 2 3 4 5 6 7 8 3.17 ROOF TRUSS SYSTEMS - FRAMING STYLES Introduction Framing with trusses gives the building designer the versatility to accomplish a multitude of interior and exterior building geometries while allowing the inside of the building to be free of any supports. Within any roof style there are many truss framing methods or systems. These systems can vary based on framing material (steel or wood), the experience of the designer, and even vary from region to region. However trusses are designed and regardless of the roof style, the challenge is to create a truss system that is efficient both to fabricate and to install. A few of the more common framing systems for steel trusses are described below. Please note that the names given to specific trusses, truss conditions and framing systems can vary from region to region. Ceiling lines may be flat or sloped. Sloped ceilings have some limitations, so please consult the truss designer. Hip Systems A hip roof framing system allows a roof area to have a sloping roof plane rising from every wall segment. This system uses smaller trusses (jack trusses) that are placed at 90 degrees to the front wall (see illustration). A truss (hip jack) runs directly underneath the hip ridge line and spans at an angle different from the other trusses. Hip jack trusses are supported by a larger truss (sometimes called the #1 hip truss) that spans the width of the building and is located a short distance (setback distance) from the front wall. For best efficiency of the stepdown hip system, a good rule of thumb is to keep the setback distance to less than 10 feet. A hip system offers the benefits of clear span with an eave or fascia line maintained at the same elevation around the building. The end slope may be equal to or different from the side slope. Typical Stepdown Hip System ENGINEERED BY ALPINE S P E C I F Y I N G / D E S I G N I N G