Roof Rafter Size Table
It is always better to have a large rafter rather than be concerned with a sagging roof.
Roof rafter size table. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Click the button to calculate the stock size needed for this job. Input the rafter span on the flat eave overhang and pitch of the roof. For pitched roofs flat roofs and ceiling joists.
Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. 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. This calculator is to be used as an estimating tool only.