Setback Chart for Retaining Walls 
Allan Block retaining wall blocks come in a variety of setbacks. Note: retaining walls designed with a 12° setback need more space than a 6° retaining wall but will be stronger and more stable.
Allan Block Retaining Walls Setback Chart |
Setback |
Wall Height |
1.2 m
|
1.8 m
|
2.4 m
|
3.0 m
|
AB Stones only of the AB Collection
|
255 mm
|
380 mm
|
510 mm
|
635 mm
|
AB Collection (excluding AB Stones & AB Vertical)
|
125 mm
|
190 mm
|
255 mm
|
320 mm
|
AB Vertical only of the AB Collection
|
65 mm
|
95 mm
|
125 mm
|
160 mm
|