In other words if there is a 1 1 2 ridge board nailed into the wall and the width of the lean to is 96 then the run will be 94 1 2 96 1 1 2 94 1 2.
Shed roof rafter span calculator.
To calculate a shed roof select shed from the roof type dropdown list or click on the corresponding button on the toolbar to calculate a shed roof.
Also available for the android os.
Click the button to calculate the stock size needed for this job.
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.
Span calculator for wood joists and rafters also available for the android os.
Input the rafter span on the flat eave overhang and pitch of the roof.
The run for a lean to shed rafter ending into a wall should account for the ridge board nailed into the wall where the tops of the rafters rest into.