Roof Rafter Size Long Island

Laying out a common rafter for simple gable or shed roofs you need to learn this basic building block of roof framing.

Roof rafter size long island.

If your local building authority has a rafter spacing code you may not space rafters wider than required by code. 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. Rafter spacing rafters must be strong enough to hold the roof sheathing and the shingles.

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. This table agrees that 10 12ft is the max span for typical grade lumber at typical spacings for a 5psf dead load. Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches.

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. Another option are 2 x 8 rafters spaced 24 inches o c. A 12 in 12 roof can cost up to 50 more than a 4 in 12 roof. 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.

Also available for the android os. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. Proudly serving nesconset holbrook islandia and more. 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.

Span calculator for wood joists and rafters also available for the android os. Roofing resources take the mystery out of getting roofing done right. Call today 631 681 1941.