Slope (or Pitch)
What is slope?
Slope is defined as the change in height (rise) as compared to the distance up the roof area (run) and is measured in inches. For example, a slope of 4:12 means 4 inches of rise for every 12 inches in run. Some people call slope "pitch", but the technically correct term is "slope".
What is the lowest slope that I can apply cedar shingles to?
Any slope of 3:12 or more is fine for cedar shingle application.