Find Hip and Ridge Cap Angles for Metal Roofing

Quick and on-the-fly lesson on finding angles, angles below.

This was a rough and quick video, but it shows how to obtain some difficult key angles in metal roofing. To find interior angle of hip caps, the angle needs to be perpendicular to the hip line. Thus, it is slightly different than just using 180°-(2)(hip walk angle). On a flat roof, this is perpendicular. But at other slopes, you need to adjust (for an 8:12 slope, you would need 5 1/8 slope [23.13°] rather than 5 11/16 slope [25.36°]).  

Hip Cap Interior Angle (Bent at Supplier):

• 36:12 → 95.74°
• 12:12 → 120.02°
• 10:12 → 126.17°
• 8:12 → 133.69°
• 6:12 → 143.00°
• 4:12 → 154.62°
• 2:12 → 166.14°
• 1:12 → 172.39°

Ridge Cap Interior Angle (Bent at Supplier):

• 36:12 → 36.87°
• 12:12 → 90.00°
• 10:12 → 100.39°
• 8:12 → 112.62°
• 6:12 → 126.87°
• 4:12 → 143.13°
• 2:12 → 161.08°
• 1:12 → 170.47°

Hip Walk Angle (for Various Roof Slopes):

• 36:12 → 25 7/16 : 12 (64.74°)
• 12:12 → 8 1/2 : 12 (35.11°)
• 10:12 → 7 1/16 : 12 (30.48°)
• 8:12 → 5 11/16 : 12 (25.36°)
• 6:12 → 4 1/4 : 12 (19.50°)
• 4:12 → 2 13/16 : 12 (13.24°)
• 2:12 → 1 7/16 : 12 (6.71°)
• 1:12 → 0 11/16 : 12 (3.37°)

Triangle 3 (Angle to Leave on Metal Hip When Cutting Bottom):

• 36:12 → 37 15/16 : 12 (72.45°)
• 12:12 → 17 : 12 (54.78°)
• 10:12 → 15 5/8 : 12 (52.48°)
• 8:12 → 14 7/16 : 12 (50.27°)
• 6:12 → 13 7/16 : 12 (48.23°)
• 4:12 → 12 5/8 : 12 (46.45°)
• 2:12 → 12 3/16 : 12 (45.44°)
• 1:12 → 12 1/16 : 12 (45.15°)