Pitched Roof Rafter Span Table

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.

Pitched roof rafter span table.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. The tables below give maximum spans for rafters and beams. 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. Let s consider a basic gable wood roof framing design.

Surveyors span tables for designing roof rafters. For pitched roofs flat roofs and ceiling joists. Here we have a wood framed gable roof. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.

This will give us the span for each individual roof rafter. 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. Anything beyond that you are looking at using 2x6s for most sheds. Click here for structural design calculations.

The figures are based on quality materials. Floor beam span tables of residential structural design we will now look at roof rafter and beam design. 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. If you look at the rafter span chart you ll notice that 2x4s can be used for rafters on spans up to 11.