CMU vs Segmental Retaining Wall
Segmental block walls (Allan Block, Versa-Lok) dry-stack with drain rock behind — great for residential walls under 4 ft. CMU walls (grouted, rebar-reinforced concrete block) handle taller loads and structural applications.
Allan Block
- Dry-stack install
- Fast to build
- Best for residential under 4 ft
Versa-Lok
- Grouted and rebar-reinforced
- Handles engineered loads
- Requires footing and inspection
| Spec | Allan Block | Versa-Lok |
|---|---|---|
| Install | Dry-stack | Grouted |
| Height limit | ~4 ft residential | Engineered |
| Footing | Compacted base | Concrete footing |
| Cost | $$ | $$$ |
Verdict
Residential landscape wall under 4 ft: segmental. Structural, over 4 ft, or engineered spec: CMU.