Rafter Lengths And Roof Construction

The rise of the rafter.

Rafter lengths and roof construction.

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. Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. While making roofing for your house with the roof rafters it is important to know the rafter length to make the roof seat perfectly on the rafter. The roof rafters provide integral structural support to the roof.

If you re framing a gable roof on a new house or building a shed or even a doghouse with a gable roof you ll need to cut a number of roof rafters. Using this handy online tool you will have an easy way to determine and figure out the specific rafters needed for the unique slope and dimensions of your roof. Height of the scaffold. Given here are the formulae to calculate the length of a shed roof rafter to make your roofings stronger and look beautiful.

Allow for ridge thickness when determining rafter run to outer wall. See rafter run to outer wall calculator below. Conclusions about the roof rafter length calculator. The run of the rafter.

The layout of your home or building will have a significant impact on the final design and slope of your roof. Print full scale rafter cut templates and birdsmouth templates fold template over rafter to mark or cut through. Pitched roof rafter lengths for gable hip lean to roof construction how to calculate the length of common roof rafters you are ready to set out and cut the common rafter lengths as soon as the wall plates have been squared levelled and fixed strapped down onto the brickwork. Enter the value for the roof width outside to outside in feet inches and fraction inches and fraction or use the inches box to enter a value in decimals if that is your preference.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. The length of the rafter. Includes result for hip valley factor slope factor and the roof slope in degrees. 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. Roof pitch calculator results explained. Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length.