Typical Roof Construction. Click on the pictures to view larger images and captions.
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Pre manufactured roof trusses are the most common type of roof framing. They can be installed much faster than a conventionally framed roof (2X8, 2X10 etc. dimensional lumber, or engineered materials). The roof truss designs are based on the calculations provided by a structural engineer and then manufactured at an off site truss yard/plant, and shipped to the job site for instillation. Roof trusses are built using a "jig" (pattern), so they are practically identical to each other. once the roof trusses are installed and all of the proper bracing is installed, the roof is then sheated with plywood, typically 1/2 inch OSB plywood.