Measuring Roof Pitch With Speed Square

In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches.

Measuring roof pitch with speed square.

This is the basic method to find the pitch of a roof. For a trapezoidal roof add the lengths of the bottom edge and ridge together divide the sum by 2 and multiply the number you get by the measurement of the line running between the two edges. It is practical when there is not a pitch tool or angle tool available. This is accomplished by use of the main protractor and two specialty protractor angle guides on the inside of the tool.

Do this for every face of differing size. Read the pitch on the side of the rafter square. Note the number on the common scale parallel with the 45 degree angle of the square. This is not difficult and is a.

Then place a torpedo level on the fat base of the rafter square and adjust the square until the level is level. Set the level on the edge of the speed square as shown below then place the heel of the speed square on a rafter or gable edge of the roof. It is often compared to slope but is not exactly the same. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio.

The pitch of the roof is read where the bottom of the rafter crosses this scale. Directly below the 6 inch mark on the framing square read the required rafter length 13 42 per foot of run for a 6 inch rise 6 in 12 roof. The hash marks with corresponding numbers between 1 and 30 refer to the roof s rise angle. Measuring pitches part of the speed square s role as a protractor and its original mission as a tool is in quickly finding common and uncommon rafter angles for the pitches on roofs.

With a torpedo level and a speed square you can pretty accurately gauge the pitch of any roof with a gable end photo 1. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. Place the pivot point against the shingles.