| Block face | 8" high × 1' 6" long |
|---|---|
| Courses | 6, building 4 ft including 6" buried |
| Blocks per course | 14 |
| Total block weight | 6,675 lb (3.3 tons) |
| Base: compacted gravel | 0.74 yd³ (about 1 ton) |
| Drainage stone behind the wall (12" wide) | 2.96 yd³ (about 4.1 tons) |
| Perforated drain pipe | optional on a wall this low (20 ft if you add one) |
On clay, or with a slope, driveway or structure above the wall, even short walls can need reinforcement. Allan Block's gravity limit drops to 1 ft 4 in for clay with a load above.