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WALL HEIGHT*
 WALL LENGTH (measured at wall face including curves)
4' 8' 12' 16' 20' 24'
4" (1 course) 6 12 18 24 30 36
8" (2 courses) 12 24 36 48 60 72
12" (3 courses) 18 36 54 72 90 108
16" (4 courses) 24 48 72 96 120 144
20" (5 courses) 30 60 90 120 150 180
24" (6 courses) 36 72 108 144 180 216
  • Be sure to bury the first course.
  • Maximum wall height not to exceed 2 feet.
  • This chart is based on site conditions which include a level grade, granular soil and no surcharge.
  • Contact Keystone Retaining Wall Systems at 1-888-601-2326 for walls over 2 feet.