Typical Roof Rafter Spacing

The above spans are based on american softwood lumber standard sizes.

Typical roof rafter spacing.

For standard shed roof rafter spacing see rafter span chart. Since most sheets are 4 x8 typical rafter spacing are 12 16 24. Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches. Usually 400 450 or 600mm but any value can be used up to 610mm max are there any brittle finishes e g.

Rafter spacing depends on the roofing panel size. It is always better to have a large rafter rather than be concerned with a sagging roof. Rafter span tables use these two tables for roof rafters with a slope of 3 in 12 or less. Builders aren t bound by standard rafter spacing measurements.

If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. But they do tend to space rafters in one of several industry standard increments typically either 12 16 or 24 inches apart. For instance 2 grade 2x4s at 16 on center will span just over 9. It will support roof loads for most situations and is the standard for most roof applications.

This is the distance between rafter centres. Use these two tables for roof rafters with a slope greater than 3 in 12. Stockbyte stockbyte getty images when placing rafters for a tin roof also frequently referred to as corrugated metal or steel it is common to set the distance between rafters based on the size of the roofing panels. In california 16 is by far the most common for residential construction.

Plasterboard on the underside of the rafter. The closer the rafters are to each other the stronger the roof will be. In the us they are typically spaced at fractions of the roof sheathing size.