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.
Roof rafter size long island.
A 12 in 12 roof can cost up to 50 more than a 4 in 12 roof.
Span calculator for wood joists and rafters also available for the android os.
Another option are 2 x 8 rafters spaced 24 inches o c.
The table states that 2 x 6 rafters spaced 16 inches on center o c can span a maximum distance of 13 feet 5 inches.
This is because a steep sloped roof requires a taller chimney and more lumber for framing.
The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that.
Also available for the android os.
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.
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.
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.
As the load goes up for snow in northern climates or for heavy roofing material like tile the span length decreases.
For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.
This table agrees that 10 12ft is the max span for typical grade lumber at typical spacings for a 5psf dead load.
Laying out a common rafter for simple gable or shed roofs you need to learn this basic building block of roof framing.
Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches.
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