Pitched Roof Rafter Span Table

In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.

Pitched roof rafter span table.

If you look at the rafter span chart you ll notice that 2x4s can be used for rafters on spans up to 11. 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. 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. Click here for structural design calculations.

The figures are based on quality materials. Let s consider a basic gable wood roof framing design. 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. Here we have a wood framed gable roof.

For pitched roofs flat roofs and ceiling joists. The pitch and span of your roof will dictate how long of a rafter you ll need use maximum span calculator to help you find your rafter size. The tables below give maximum spans for rafters and beams. Continuing on from part 3.

3265 45 3220mm total span less ridge thickness 3220 2 1610mm horizontal span each rafter will cover and before meeting the ridge now when we turn to the 30 page in the rafter ready reckoner and when looking up the common rafter lengths one of the things it tells us is. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. This will give us the span for each individual roof rafter. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.