What is standard size of a roof rafter?

The standard size of a roof rafter typically depends on the span and load requirements, but common dimensions are 2x6, 2x8, or 2x10 inches, with lengths varying based on the roof design. For residential construction, 2x6 rafters are often used for spans up to 10 feet, while larger spans may require 2x8 or 2x10 rafters. The spacing between rafters is generally 16 or 24 inches on center. It's essential to consult local building codes and a structural engineer for specific requirements.