How To Measure The Rafters For Roof Framing

Calculating rafter length 1.

How to measure the rafters for roof framing.

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. Cut the rafters to find the location of the rear lentil for the rafters use a framing square. You can determine the length of a common rafter using either of two easy methods. Subtract the width of your ridge beam.

This must be from walls that are of equal heights. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Use the number boxes to enter the value in feet inches and fraction inches and fraction. If they are not then click here for the unlevel wall rafter calculator.

Includes result for hip valley factor slope factor and the roof slope in degrees. Rafter run is the horizontal distance the rafter travels. Roof pitch calculator results explained. Divide the adjusted width.

This calculator helps you make the rafters of the suitable sizes required for your roofing. Once you located where the mark falls on the 2 x 10 measure the distance and be sure to add 10 for the overhang. The top of the ridge beam m y. Take a direct measurement of the width of the roof.

As a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. On a full gable roof this is equal to half the building width minus half the ridge thickness. Cut one end of each 2 x 8 rafter to get the necessary length desired. Remember if you are using the center of the ridge.

The ridge beam is the vertical piece of plywood which will form the peak of. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. 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.

In our example we have a 7 12 roof 7 inches of rise for every foot of run. Rafter is a sloping beam usually wood that supports a pitched roof. To determine the finished height of the ridge beam add the rise m and the y height. Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement.

A by measuring the actual distance from the outside of the wall s top plate same location as the rafter s bird s. To determine the y height measure from the bird s mouth up the calculated slope x in 12 to the top of the rafter.