Solar Roof Pitch Conversion Angles

Here’s the pitch schedule:

12/1 = 4 °
12/2 = 9.5°
12/3 = 14°
12/4 = 18.5°
12/5 = 22.5°
12/6 = 26.5°a
12/7 = 30.5°
12/8 = 33.75°
12/9 = 37°
12/10 = 40°
12/11 = 42.5°
12/12 = 45°

  • These are angles that correspond to roof pitches, if you measured horizontally one foot against a roof, the distance from the end of one foot horizontal on the rake of a slope/gable to the intersection will give you the  pitch.
  • roof-pitch-chart image source: http://www.carpentry-pro-framer.com/images/roof-pitch-chart.gif

    roof-pitch-chart image source: http://www.carpentry-pro-framer.com/images/roof-pitch-chart.gif

      • Example: 12 inches horizontal, 5 inches vertical = “five twelve’ pitch.
  • If you need to convert a roof pitch measured in grade (%) and need an angle then you use this chart above.
  • Often when installing solar panels you need to know the latitude angle for the correct install angle.
  • If you can design a house to have the same roof angle as your latitude you have made a solar collector rack–as your house!
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