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 |
4 ft
(1.2 m) |
6 ft
(1.8 m) |
8 ft
(2.4 m) |
10 ft
(3.0 m) |
AB Stones only
of the AB Collection
|
10.0 in
255 mm |
15.0 in
380 mm |
20.0 in
510 mm |
25.0 in
635 mm |
AB Collection
(excluding AB Stones & AB Vertical)
|
5.0 in
125 mm |
7.5 in
190 mm |
10.0 in
255 mm |
12.5 in
320 mm |
AB Fieldstone Collection
|
5.0 in
125 mm |
7.5 in
190 mm |
10.0 in
255 mm |
12.5 in
320 mm |
AB Vertical only
of the AB Collection
|
2.5 in
65 mm |
3.75 in
95 mm |
5.0 in
125 mm |
6.25 in
160 mm |