How To Measure The Rafters For Roof Framing

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.

How to measure the rafters for roof framing.

Once you located where the mark falls on the 2 x 10 measure the distance and be sure to add 10 for the overhang. Use the number boxes to enter the value in feet inches and fraction inches and fraction. Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. Cut the rafters to find the location of the rear lentil for the rafters use a framing square.

Measure the width of your building. This calculator helps you make the rafters of the suitable sizes required for your roofing. Divide the adjusted width. Rafter run is the horizontal distance the rafter travels.

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. You can determine the length of a common rafter using either of two easy methods. In our example we have a 7 12 roof 7 inches of rise for every foot of run.

Calculating rafter length 1. Remember if you are using the center of the ridge. Subtract the width of your ridge beam. Rafter is a sloping beam usually wood that supports a pitched roof.

Roof pitch calculator results explained. To determine the finished height of the ridge beam add the rise m and the y height. 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.

This must be from walls that are of equal heights. Take a direct measurement of the width of the roof. On a full gable roof this is equal to half the building width minus half the ridge thickness. On construction calculators slope is often called pitch.

Before you start cutting you first need to determine how long your roof rafters. 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. To determine the y height measure from the bird s mouth up the calculated slope x in 12 to the top of the rafter. 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 top of the ridge beam m y. 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.