Standard Roof Rafter Spacing

Here in northern wisconsin must roof framing is 24 o c.

Standard roof rafter spacing.

Spacing of roof framing members depends on the type and thickness of the roof sheathings boads and the regional snow loads. If your local building authority has a rafter spacing code you may not space rafters wider than required by code. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. On center as the roof sheathing is span rated for 24 o c.

Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. If you get premium kiln dried lumber then you could span 10 5 with the same size of lumber and. For instance 2 grade 2x4s at 16 on center will span just over 9. Wider panels allow for greater spacing between rafters.

Builders aren t bound by standard rafter spacing measurements. Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches. Rafters must be strong enough to hold the roof sheathing and the shingles. Rafter and roof joist spacing is only one part of a complex roof design that works together to form a structure that meets building codes and can hold up the weight of the roof and roof load.

For standard shed roof rafter spacing see rafter span chart.