Another option are 2 x 8 rafters spaced 24 inches o c.
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If your local building authority has a rafter spacing code you may not space rafters wider than required by code.
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In making your choice consider how you will insulate your insulate your roof.
The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that.
This is because a steep sloped roof requires a taller chimney and more lumber for framing.
Laying out a common rafter for simple gable or shed roofs you need to learn this basic building block of roof framing.
As the load goes up for snow in northern climates or for heavy roofing material like tile the span length decreases.
Perfect roof rafters focus your efforts on the pattern rafter and the rest of the roof falls into place easily.
A 12 in 12 roof can cost up to 50 more than a 4 in 12 roof.
Also available for the android os.
Span calculator for wood joists and rafters also available for the android os.
For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.
However the end result may be well worth it as your roofing material is estimated to last up to 50 longer and will require less maintenance.
According to the american wood council the maximum span for rafters is about 30 feet and that s with a relatively low load of 20lbs per square foot.
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Rafter spacing rafters must be strong enough to hold the roof sheathing and the shingles.
Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches.
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If this calculator from the american wood council is to be believed and if my assumptions about your materials and load are correct the max span is about 10ft for a pine 2x6.