2x4 Rafters Shed Roof Rafter Span Calculator

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.

2x4 rafters shed roof rafter span calculator. 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. See rafter run to outer wall calculator below. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. For standard shed roof rafter spacing see rafter span chart.

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. Allow for ridge thickness when determining rafter run to outer wall. An syp rafter can span 11. Calculating a shed roof with easy rafters.

Also available for the android os. 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. Half building width minus 1 2 ridge thickness. If you live in an area that requires a shed roof rafter to support a heavy load then an spf rafter can only span 7.

There is no standard spacing it depends on what size of rafters you want to use and the span of your shed. Includes result for hip valley factor slope factor and the roof slope in degrees. Span calculator for wood joists and rafters also available for the android os. Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement.

For instance 2 grade 2x4s at 16 on center will span just over 9. Both of these are for light roof loads. Easy rafters is designed to calculate shed roofs that are framed to a ledger board nailed against a vertical wall not freestanding shed roofs supported by walls at both ends. Shed roof a shed roof slopes in one direction only.

As mentioned above a 2 4 spf shed roof rafter can span 11. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. 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.