Shed Roof Rafter Spacing Calculator

If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length.

Shed roof rafter spacing calculator.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. 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. 2002 bs 5268 7 5. Rafter length calculator calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement.

Here the number is 941 86 inches. Usually 400 450 or 600mm but any value can be used up to 610mm max. 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. 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.

Spacing in exterior exposure. 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. Shed roof a shed roof slopes in one direction only. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone.

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. Includes result for hip valley factor slope factor and the roof slope in degrees. Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak. 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.

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. Calculations to bs 5268 2. Number of rafters and their dimensions. Typical tiled roof with plasterboard on underside of rafters.

Rafter run outer wall this should be measured starting from the center of the roof span and then extending to the very edge of the exterior wall. Span calculator for wood joists and rafters also available for the. Here the number is 1166 66 inches.