Shed Roof Rafter Span Calculator

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.

Shed roof rafter span calculator.

If you look at the rafter span chart you ll notice that 2x4s can be used for rafters on spans up to 11. Print full scale rafter cut templates and birdsmouth templates fold template over rafter to mark or cut through. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Half building width minus 1 2 ridge thickness.

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. Anything beyond that you are looking at using 2x6s for most sheds. 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. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Also available for the android os. See rafter run to outer wall calculator below. This calculator is to be used as an estimating tool only. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.

Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. Allow for ridge thickness when determining rafter run to outer wall. 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. Click the button to calculate the stock size needed for this job.

Span calculator for wood joists and rafters also available for the android os. The preview window displays a dimensioned side view of the shed roof. 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.