How To Figure Rafter Lengths For Roof

It is the length of this portion of the rafter.

How to figure rafter lengths for roof.

The run of the rafter. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Note that this is not the actual length of the rafter. Contents1 rafter of roof 2 span of roof 3 rise of roof 4 pitch of roof 5 run of roof 6 exmple 1 7 example 2 8 calculate rafter length using angle.

Includes result for hip valley factor slope factor and the roof slope in degrees. Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. Rafter is the distance between the ridge or hip of the roof to. Using the appropriate roof pitch table in a rafter cutting guide such as 4 12 determine the length of each rafter based on the correlating measurement shown for 7 feet.

For example if the roof rises 4 feet and the span is 16 feet twice the run. Step 4 add the measurement for the overhang the eaves on the outside wall to the result obtained in the rafter guide to determine the overall rafter length. The results are automatically fired. 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.

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

Area span on the flat please enter area span on the flat in foot. The dotted line is how the rafter length measurement is used measure from the point at the top down the length and plumb a line there. Calculate the length of common rafters with this free and easy online tool by entering a dimension for the roof width selecting a pitch for the roof and the thickness of the ridge. Before starting the calculation we need to know some technical terms related to a pitched roof.

This calculator is to be used as an estimating tool only. Determine the camber along the timbers length. The rafter member will be longer. Given here are the formulae to calculate the length of a shed roof rafter to make your roofings stronger and look beautiful.

The rise of the rafter. Height of the scaffold. Before you can mark the rafter lengths and layout check the camber of the timber. Pitch is the incline of the roof represented as the ratio of rise to the span twice the run.