shed roof rafter size calculator

How to calculate a lean to rafter 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. 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. The process will generally be the same for a shed of any moderate size, but be sure to use the rafter sizing calculator above to find the correct rafter length and size for your shed rafter project. we’ll be using a ridge beam for this project, so each set of rafters will meet a horizontal 2