What is the maximum span for ceiling joists, rafter framing, and trusses between points of vertical support?

The maximum span for ceiling joists, rafter framing, and trusses is influenced by factors such as material type, size, and spacing, but generally, in residential and light commercial construction, the maximum span often aligns more closely with conventional standards, which typically set limits around 30 feet for roofs using standard lumber framing components. For engineered trusses, this span can be greater due to the specific design and materials used, allowing for spans that can reach or sometimes exceed 40 feet under certain conditions and designs.

The correct choice reflects the practice in certain applications where engineered wood products or trusses can effectively support larger spans, making them ideal for expansive areas without internal load-bearing walls. Factors such as local building codes, load conditions (like snow and wind loads), and the complexity of design also contribute to determining these spans.