How To Measure The Rafters For Roof Framing

Take a direct measurement of the width of the roof.

How to measure the rafters for roof framing.

The top of the ridge beam m y. Before you start cutting you first need to determine how long your roof rafters. Measure the width of your building. Rafter run is the horizontal distance the rafter travels.

A by measuring the actual distance from the outside of the wall s top plate same location as the rafter s bird s. Remember if you are using the center of the ridge. To determine the y height measure from the bird s mouth up the calculated slope x in 12 to the top of the rafter. In our example we have a 7 12 roof 7 inches of rise for every foot of run.

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. You can determine the length of a common rafter using either of two easy methods. 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. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length.

Rafter is a sloping beam usually wood that supports a pitched roof. Once you located where the mark falls on the 2 x 10 measure the distance and be sure to add 10 for the overhang. To determine the finished height of the ridge beam add the rise m and the y height. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.

On a full gable roof this is equal to half the building width minus half the ridge thickness. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. The ridge beam is the vertical piece of plywood which will form the peak of. If they are not then click here for the unlevel wall rafter calculator.

Roof pitch calculator results explained. This must be from walls that are of equal heights. Cut the rafters to find the location of the rear lentil for the rafters use a framing square. Divide the adjusted width.

Calculating rafter length 1. Includes result for hip valley factor slope factor and the roof slope in degrees. Cut one end of each 2 x 8 rafter to get the necessary length desired. On construction calculators slope is often called pitch.

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. Subtract the width of your ridge beam.