What is the standard spacing for rafters mentioned in the text?

The standard spacing for rafters is typically 24 inches on center (O.C.), which means that the centers of adjacent rafters are spaced 24 inches apart. This spacing is widely used in residential construction, as it provides a suitable balance between structural support and material efficiency.

Using 24" O.C. spacing allows for the use of standard-sized lumber and optimizes the load-bearing capacity while minimizing the amount of materials needed. It also facilitates the installation of insulation and roofing materials.

While other spacings, such as 18", 30", and 36", exist for specialized applications or building methods, they are not the standard for rafters in typical construction. For instance, spacing rafters closer than 24 inches may be necessary in areas with heavy snow loads or for specific types of roofs, while wider spacing can reduce structural integrity and lead to issues such as sagging. However, for conventional roof framing, the 24" O.C. standard is widely accepted and practiced in the industry.