Rafter Lengths And Roof Construction

The roof rafters provide integral structural support to the roof.

Rafter lengths and roof construction.

Half building width minus 1 2 ridge thickness. Includes result for hip valley factor slope factor and the roof slope in degrees. 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.

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. The run of the rafter. Angle the angle of a roof is the same as the roof s slope except instead of being. 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.

See rafter run to outer wall calculator below. Allow for ridge thickness when determining rafter run to outer wall. The layout of your home or building will have a significant impact on the final design and slope of your roof. The rise of the rafter.

Slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run this is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. 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. Height of the scaffold.

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

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. 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. Print full scale rafter cut templates and birdsmouth templates fold template over rafter to mark or cut through. 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.