Rafter Sizes For A Pitched Roof

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 sizes for a pitched roof. Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof. These numbers are for roofs supporting light loads of 20 pounds for square foot. Click the button to calculate the stock size needed for this job. This calculator is to be used as an estimating tool only.

Area span on the flat. Input the rafter span on the flat eave overhang and pitch of the roof. It is always better to have a large rafter rather than be concerned with a sagging roof. That means it can span a total length of over 26 for a gable roof.

For pitched roofs flat roofs and ceiling joists. Can span up to 13 4. Input the rafter span on the flat eave overhang and pitch of the roof. This calculator is to be used as an estimating tool only.

Click the button to calculate the stock size needed for this job. 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 the most commonly used pitches range between 4 12 and 9 12. How do you calculate the slope of a roof.

As aforementioned there is no standard pitch of a roof. An spf roof at the same spacing and lumber size will span 11. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Rafter stock size calculator.

Rafter span tables use these two tables for roof rafters with a slope of 3 in 12 or less. Roof pitch between 30 and 45 degrees with rafter spacing strength class c24 maximum clear span of purlins in metres for roof pitches of between 30 and 45 degrees roof pitch between 30 and 45. Use these two tables for roof rafters with a slope greater than 3 in 12. Rafter stock size calculator.

Surveyors span tables for designing roof rafters. Again make sure to consult local codes. An syp 2 6 rafter at 24 o c.