How To Figure Rafter Lengths For Roof

The rafter member will be longer.

How to figure rafter lengths for roof.

Input the rafter span on the flat eave overhang and pitch of the roof. 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. It is the length of this portion of the rafter. Area span on the flat please enter area span on the flat in foot.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Click the button to calculate the stock size needed for this job. The length of the rafter. The rise of the rafter.

Pitch is the incline of the roof represented as the ratio of rise to the span twice the run. 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. The results are automatically fired. Before starting the calculation we need to know some technical terms related to a pitched roof.

Rafter is the distance between the ridge or hip of the roof to. For example if the roof rises 4 feet and the span is 16 feet twice the run. Given here are the formulae to calculate the length of a shed roof rafter to make your roofings stronger and look beautiful. 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.

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. Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. Lengths of roofing timber almost always bow slightly. The run of the rafter.

This calculator is to be used as an estimating tool only. If you plan to have overhang etc. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. Before you can mark the rafter lengths and layout check the camber of the timber.

Height of the scaffold. 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. Note that this is not the actual length of the rafter. Includes result for hip valley factor slope factor and the roof slope in degrees.