Which term refers to an inclined beam that supports a roof and runs parallel to the slope?

• A. Rafter
• B. Purlin
• C. Ridge
• D. Stud

Answer: (A)

In roof framing, rafters are the inclined members that carry the roof load and run along the slope of the roof. They start at the ridge at the top and angle down to the wall plate, supporting the roofing material above. This diagonal orientation along the slope is what defines a rafter.

A horizontal beam that provides intermediate support for rafters is a purlin, not the inclined slope member. The ridge is the top horizontal line where the two roof planes meet. A stud is a vertical wall framing member. So the defining feature here is the angled, slope-parallel member that directly supports the roof deck—an example of a rafter.