Rafter Sizes For A Pitched Roof

Rafter stock size calculator.

Rafter sizes for a pitched roof.

These numbers are for roofs supporting light loads of 20 pounds for square foot. That means it can span a total length of over 26 for a gable roof. Area span on the flat. Rafter span tables use these two tables for roof rafters with a slope of 3 in 12 or less.

As aforementioned there is no standard pitch of a roof. Surveyors span tables for designing roof rafters. For pitched roofs flat roofs and ceiling joists. This calculator is to be used as an estimating tool only.

If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. It is always better to have a large rafter rather than be concerned with a sagging roof. Rafter length using angle v r 2cos a rafter length using pitch v r 2 sqrt 1 p 2 where v overhang r roof span p pitch use our online rafter length calculator to quickly compute the length of the shed roof rafter by entering the measurements of overhead length of roof span pitch or angle. An syp 2 6 rafter at 24 o c.

Input the rafter span on the flat eave overhang and pitch of the roof. Rafter stock size calculator. 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. The above spans are based on american softwood lumber standard sizes.

Click the button to calculate the stock size needed for this job. Use these two tables for roof rafters with a slope greater than 3 in 12. Click the button to calculate the stock size needed for this job. You write the pitch assuming a run of 12 inches thus the ratio would describe how much a roof rises for each foot of the 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. 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. How do you calculate the slope of a roof. An spf roof at the same spacing and lumber size will span 11.

Again make sure to consult local codes. Can span up to 13 4. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.