Rafter is a sloping beam usually wood that supports a pitched roof.
Roof rafter length calculator metric.
Half building width minus 1 2 ridge thickness.
Measure the run length it is the horizontal distance between the roof ridge and the wall of the building.
Roof pitch calculator results explained.
Minus ridge thickness to allow for ridge becoming pole plate roof peak will be slightly higher ridge thick must be same.
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.
Height of the scaffold.
Enter the extension wall length into wall length and double the extension wall width then minus ridge thickness into the wall width entries.
Calculate the length of a rafter in metres using the roof slope measured in degrees and the gable wall width in metres.
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.
The rise of the rafter.
Includes result for hip valley factor slope factor and the roof slope in degrees.
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 from roof slope in degrees using metric measurement.
Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement.
The length of the rafter.
To do this your best bet is definitely finding a good hip roof construction calculator so that you can work it all out in a timely and simple fashion.
If there is an overhang the rafter overhang is measured in millimetres from outside wall to inside fascia board level across.
Let s assume it is equal to 6 m.
This calculator helps you make the rafters of the suitable sizes required for your roofing.
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.
See rafter run to outer wall calculator below.
Porch roof extensions for hip roof porch extensions from an existing building wall you can use half the calculator results.
Roof slope calculator example of use.
Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.
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.
Measure the rise of your roof.
Let s say it is equal to 1 5 m.
Calculate the rafter length substituting these values into the following formula.
Print full scale rafter plumb cut templates and birdsmouth templates fold template over rafter to mark or cut through.
