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Rafter spacing for metal roof4/16/2024 Wood QualityĮven wood that is the same species isn’t all created equal. Cedar and redwood, in comparison, can only span up to 5 feet 2 inches on a deck with 6-foot joist spans. Thus, it’s able to span a longer distance before needing additional support.Ī two-ply 2×6–2圆s are typically doubled up when used as support beams–length of yellow pine can span up to 6 feet 8 inches from post to post on a deck with joists that span 6 feet from beam to beam. Southern pine, perhaps the most common wood used for dimensional lumber, is stronger than other softwoods, such as cedar, redwood, douglas fir, and red pine. Wood has different strength qualities depending on what species it is. In this section, we’ll examine how these factors affect the maximum span of 2×6 lumber. Wood species and quality as well as the load the structural lumber is carrying, all impact how far a 2×6 can safely span. Maximum span depends on a wide variety of factors that go beyond the simple dimension of the lumber. What Factors Impact How Far a 2×6 Can Span? When framing a roof, rafter span is determined by how far dimensional lumber can travel from the top of a wall plate to the roof peak and still provide adequate support for the roof. For deck joists, span determines the distance a joist can cover before it needs support from a supporting beam. In the case of floor beams, span refers to how far the beam can span before it needs support from a post or piling. 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 span comes up a lot whether constructing a home, shed, or deck. How Far Can 2×6 Floor / Deck Joist Span?.How Much Weight Can a 2×6 Support Horizontally?.
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