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Rafter vs joist12/25/2023 ![]() The other ends of the rafters bear on the exterior walls. Again, picture deck joists connected to a beam with hangers. The rafters are then connected to the beam and transmit their full vertical load downward. The ends of the beam must be supported as concentrated loads, generally by posts inside walls or in the middle of a room. ![]() The ridge is constructed as a beam that runs from end to end. The rest of the roof framing then follows suit.Ī roof with a ridge beam can be more easily understood if it's imagined to be a flat surface-like a deck in plan view. They're most easily identified by the type of ridge used: either a ridge beam, which is a structural or load-bearing member, or a ridge board, which is a non-structural framing member. But when it's boiled down, there are essentially two standard methods of roof construction, each having some flexibility. Understanding this history provides perspective on why the treatment of roof construction in the IRC and the associated Wood Frame Construction Manual(WFCM) allows for such broad interpretation. Combining these disparate styles and standards into a single code-the International Residential Code (IRC)-was no easy feat, and seemingly fundamental aspects of roof construction are still up for debate. Between the Eastern and Western codes, there were even different names for identical parts. In the past, methods described by the three main building codes (BOCA, UBC, and SBC), though similar, differed based on climatic factors-such as expected wind and snow loads-local habits, and available materials. Long before any building codes were published, conventional roof framing methods developed through practice, resulting in approaches to roof framing that are as varied as the framers themselves.
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