![]() ![]() The size of the rafter needed for a 24-foot span have to be 2×12 lumber spaced at 12″ on center. However, at 12 inches on center spacing you can use a 2×10 size of lumber as rafter for 22 feet span. The size of the rafter needed for a 22-foot span have to be 2×12 lumber spaced at 16″ on center. However, at 12 inches on center spacing you can use a 2×10 size of lumber as rafter for 20 feet span. ![]() The size of the rafter needed for a 20-foot span have to be 2×12 lumber spaced at 16″ on center.
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