Likewise, from a 17 to 20 foot span, you would need a 2×10 rafter, while from a 21 to 24 foot span you would need a 2×12 rafter. In general, at 16″ oc, from a 8 to 12 foot span, you would need a 2×6 rafter, while from a 13 to 16 foot span you would need a 2×8 rafter. To determine the appropriate rafter size for a specific span, you’ll need to consider factors such as the type of wood, the load it will bear, and local building codes. Subscribe our Youtube Channel What size rafter do i need for specific span Likewise, the maximum span of a 2×10 rafter need to be 21 feet, while the maximum span of a 2×12 rafter need to be 25 feet. In general, at 16″ oc, the maximum span of a 2×6 rafter need to be 12 feet, while the maximum span of a 2×8 rafter need to be 16 feet. So, in the case of deck beams, span refers to the distance between the center of one support post to the center of the next post. When span guidelines are given, they refer to the distance between the center of one support to the center of another. Span refers to the distance a piece of dimensional lumber can cover before it needs to be supported by a foundation or support post. The term clear span is distance between two end support, generally comes up a lot whether constructing a home, shed, or deck.
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