Roof Rafter Sizes For Pitched Roof

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.

Roof rafter sizes for pitched roof.

Here the number is 1166 66 inches. For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2. Usually 400 450 or 600mm but any value can be used up to 610mm max usually 400 450 or 600mm but any value can be used up to 610mm max are there any brittle finishes e g. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.

The length of rafter per meter of run is 1 1543. Again make sure to consult local codes. All we do now is use a calculator to multiply 1 610 by the measurement in the book. Plasterboard on the underside of the rafter.

This is the distance between rafter centres. Surveyors span tables for designing roof rafters. For pitched roofs flat roofs and ceiling joists. Surveyors and structural engineers utilise data from tables below to help calculate the correct size strength and centres of roof timbers for the required spans and loadings.

Rafter run outer wall this should be measured starting from the center of the roof span and then extending to the very edge of the exterior wall. It is always better to have a large rafter rather than be concerned with a sagging roof. Here the number is 941 86 inches.