How far can a 2″×6″, 2″×8″, 2″×10″, 2″×12″ & 2×14 rafter span | what is the maximum span for a 2×6, 2×8, 2×10 & 2×12 rafter | What is the maximum span for a 2×6 rafter | maximum span for a 2×8 rafter | maximum span for a 2×10 rafter | maximum span for a 2×10 rafter | maximum span for a 2×12 rafter | maximum span for a 2×14 rafter.
A rafter is a structural component build of wood or steel that is used as part of a roof construction. Rafter runs from the ridge or hip of the roof to the wall plate of the external wall. Rafters are generally provide in series, side by side, providing a plateform to support roof decks and roof coverings.
In many countries such as in US, Canada United Kingdom roof rafter made of wood/ timber are much common to build a house. Many species of wood are used to provide timber which have much strength. Rafters are usually made of pine or cedar tree, for longer span rafters, building materials severals manufacturers have created Laminated veneer lumber (LVL) rafters that can be 2-5 times longer than typical wood rafter. In US, most wood rafters have maximum length of 20 feet.
Most common size of roof rafter is 2″×6″, 2″×8″, 2″×10″, 2″×12″ and 2″×14″ are used in roof framing. Thickness of rafter should be not less than 2 inches and their depth should be range from 4″ to 12″. Length of Rafter depending on climatic condition, style, slope and type of structure. It is used over brick external wall, wall plate, over two support and over top of beam.
A rafter is a structural component that is used as part of a roof construction. Typically, it runs from the ridge or hip of the roof. Design and construction of roof is depending on many factors but one of the most common important factor is climatic and weather condition of your surrounding areas, in your cities and countries. The area which has heavy rainfall and snowfall require good drainage for roof, roof drainage depending on slope of the roof provided, based on slope of roof it is categorised into two types flat roof and pitched roof or sloping roof.
The spacing of roof rafter is just one of the component used to determine the minimum size of roof rafter. There is no any standard rafter spacing measurements. But generally rafter spaced typically either 12, 16 or 24 inches apart in one of several industry -standard increments.
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In this article you know about what is the maximum span for a 2×6, 2×8, 2×10 & 2×12 rafter that will help you in better understanding and to figure out or estimate of maximum allowable span. Generally span is distance between two support end.
How far can a 2″×6″, 2″×8″, 2″×10″, 2″×12″ & 2×14 rafter span
The term clear span is distance between two end support, generally comes up a lot whether constructing a home, shed, or deck. Span refers to the distance a piece of dimensional lumber can cover before it needs to be supported by a foundation or support post.
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When span guidelines are given, they refer to the distance between the center of one support to the center of another. 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.
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Maximum span of rafter depending on wide variety of actors such as wood species, quality of wood as well as dead & live load the the structural lumber is carrying, all impact how far a 2×6, 2×8, 2×10, 2×12 & 2×14 can safely span. Wood has different strength and quality depending on the species, southern fine perhaps most common wood used for dimensional lumber is a stronger than other softwood such as Cedar, Redwood, Douglas fir and red pine. No. 1 grade lumber have fewer knots than No. 2 lumber, therefore it is a stronger. However, in Northern climates may need to be a stronger rafter to support heavy snow load. What is the maximum span for a 2×6, 2×8, 2×10 & 2×12 rafter.
How far can a 2×6 rafter span without support
Maximum allowable span for a 2×6 rafter:- the maximum allowable span for 2×6 rafter is 16 feet 5 inches when spaced 12 inches apart from centre, 14 feet 8 inches at 16″ OC & 12 feet 8 inches at 24″ OC with best quality No. 1-grade southern pine lumber on a roof with a 3/12 slope or less (flat roof) with a maximum live load of 20 pounds per square foot (lbs/ft2) and a dead load of 15 psf.
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How far can a 2×6 rafter span:- a 2×6 rafter can span 14 feet 8 inches when spaced 16 inches apart from centre, 16 feet 5 inches at 12″ OC & 12 feet 8 inches at 24″ OC without support with best quality No. 1-grade southern pine lumber on a roof with a 3/12 slope or less (flat roof) with a maximum live load of 20 pounds per square foot (lbs/ft2) and a dead load of 15 psf. Thus a 2×6 rafter can safely span upto 14 feet 8 inches when spaced 16 inches apart from centre.
How far can a 2×8 rafter span without support
Maximum allowable span for a 2×8 rafter:- the maximum allowable span for 2×8 rafter is 21 feet 7 inches when spaced 12 inches apart from centre, 19 feet 6 inches at 16″ OC & 18 feet 6 inches at 24″ OC with best quality No. 1-grade southern pine lumber on a roof with a 3/12 slope or less (flat roof) with a maximum live load of 20 pounds per square foot (lbs/ft2) and a dead load of 15 psf.
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How far can a 2×8 rafter span:– a 2×8 rafter can span 19 feet 6 inches when spaced 16 inches apart from centre, 21 feet 7 inches at 12″ OC & 18 feet 6 inches at 24″ OC without support with best quality No. 1-grade southern pine lumber on a roof with a 3/12 slope or less (flat roof) with a maximum live load of 20 pounds per square foot (lbs/ft2) and a dead load of 15 psf. Thus a 2×8 rafter can safely span upto 19 feet 6 inches when spaced 16 inches apart from centre.
How far can a 2×10 rafter span without support
Maximum allowable span for a 2×10 rafter:- the maximum allowable span for 2×10 rafter is 27 feet 6 inches when spaced 12 inches apart from centre, 24 feet 8 inches at 16″ OC & 21 feet 3 inches at 24″ OC with best quality No. 1-grade southern pine lumber on a roof with a 3/12 slope or less (flat roof) with a maximum live load of 20 pounds per square foot (lbs/ft2) and a dead load of 15 psf.
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How far can a 2×10 rafter span:- a 2×10 rafter can span 24 feet 8 inches when spaced 16 inches apart from centre, 27 feet 6 inches at 12″ OC & 21 feet 3 inches at 24″ OC without support with best quality No. 1-grade southern pine lumber on a roof with a 3/12 slope or less (flat roof) with a maximum live load of 20 pounds per square foot (lbs/ft2) and a dead load of 15 psf. Thus a 2×10 rafter can safely span upto 24 feet 8 inches when spaced 16 inches apart from centre.
How far can a 2×12 rafter span without support
Maximum allowable span for a 2×12 rafter:– the maximum allowable span for 2×12 rafter is 33 feet 5 inches when spaced 12 inches apart from centre, 30 feet 0 inches at 16″ OC & 25 feet 10 inches at 24″ OC with best quality No. 1-grade southern pine lumber on a roof with a 3/12 slope or less (flat roof) with a maximum live load of 20 pounds per square foot (lbs/ft2) and a dead load of 15 psf.
How far can a 2×12 rafter span:- a 2×12 rafter can span 30 feet 0 inches when spaced 16 inches apart from centre, 33 feet 5 inches at 12″ OC & 25 feet 10 inches at 24″ OC without support with best quality No. 1-grade southern pine lumber on a roof with a 3/12 slope or less (flat roof) with a maximum live load of 20 pounds per square foot (lbs/ft2) and a dead load of 15 psf. Thus a 2×12 rafter can safely span upto 30 feet 0 inches when spaced 16 inches apart from centre.
How far can a 2×14 rafter span without support
Maximum allowable span for a 2×14 rafter:- the maximum allowable span for 2×14 rafter is 25 feet 11 inches when spaced 12 inches apart from centre, 22 feet 6 inches at 16″ OC & 18 feet 4 inches at 24″ OC with best quality No. 1-grade southern pine lumber on a roof with a 3/12 slope or less (flat roof) with a maximum live load of 60 pounds per square foot (lbs/ft2) and a dead load of 15 psf.
How far can a 2×14 rafter span:- a 2×14 rafter can span 22 feet 6 inches when spaced 16 inches apart from centre, 25 feet 11 inches at 12″ OC & 18 feet 4 inches at 24″ OC without support with best quality No. 1-grade southern pine lumber on a roof with a 3/12 slope or less (flat roof) with a maximum live load of 60 pounds per square foot (lbs/ft2) and a dead load of 15 psf. Thus a 2×14 rafter can safely span upto 22 feet 6 inches when spaced 16 inches apart from centre.
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Conclusion:- a 2×6 rafter can span 14 feet 8 inches, 2×8 rafter can maximum span upto 14 feet 8 inches, 2×10 can span 24′- 8″, 2×12 can span 30′-0″ & 2×14 rafter can span upto 22 feet 6 inches when placed 16 inches apart from centre.
