construction system?
Roofs are constructed either with rafters (stick-framed roofs) or with trusses. Stick-framed roofs are usually made with dimension lumber but may also use composite materials such as I-joist rafters (see 151-154).
Stick framing originated before the development of balloon-frame construction in the 19th century. Antecedents of the modern stick-framed roof can be seen on ancient roofs around the world, and modern stick-frame roofing remains popular because it is the most flexible roof-framing system and the materials are least expensive.
Trusses are made of a number of small members (usually 2x4s) joined in a factory or shop to make one long structural assembly. Only in very simple buildings does the labor savings of a truss system compete with stick framing.
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