Roof Pitch Angle Cuts

Set cut angle for rafter place the framing square so the blade is horizontal on the rafter and the tongue is on the rafter and draw lines.

Roof pitch angle cuts.

Tap the button to start measuring and lay your device on an angle roof to measure pitch and angle and animate the diagram. Before you start cutting you first need to determine how long your roof rafters need to be and the angles at which you ll cut the top and bottom of the rafter. While measuring tap to hear the spoken angle continuously as it changes. Roof angles and rafter plumb cuts.

Set unit run place the other square gauge at the run unit measurement mark. Use a square to mark a line up into the board 6 inches from the center of one end. Angle the angle of a roof is the same as the roof s slope except instead of being represented as x 12 it is represented in degrees. The tongue is the cut angle for the rafter.

Screw the square gauge on the tongue at the marker for the slope pitch of the roof or the unit rise. Roof pitch is measured in a rise to run ratio with the vertical rise always shown first. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Cut the end of a fourth piece using the same angle from the upper cords.

To do this simply convert the rise and run as a fraction to a decimal form eg. Rise run rise run slope. To find the angle of a roof in degrees convert the pitch to a slope then convert to degrees by finding the arc tangent of the slope. Cut off one corner of the board at the angle you have set.

Screw the gauge in place. Measure as precisely as possible down to the 1 4 inch 0 64 cm 1 8 inch 0 32 cm or 1 16 inch 0 16 cm. With a mobile device a button will appear. So if your roof is a 45 degree angle that is for every 12 along the horizontal run it rises 12 it s a 12 12 pitch.

If it rises only 6 for every 12 it s a 6 12 pitch. Flip the board to the opposite corner and cut again so that the angles meet in a peak on the center line you drew. Visit this page on your phone to directly measure pitch and angles. The traditional method has been rise inches 12 run inches.

First convert the pitch to a slope.