Design Wall Height, Setback, and Footing Depth
Half dayCalculate block count for wall length and height, determine footing depth below frost line, plan geogrid layers if over 3 feet.
Field context
This workflow is part of 4 niche fields
Complete guide for retaining wall project — step-by-step workflow, tools, checklist, and expert tips to get started.
Calculate block count for wall length and height, determine footing depth below frost line, plan geogrid layers if over 3 feet.
Dig footing trench, place compacted base, install perforated drain pipe behind wall with outlet to daylight.
Set level base course on crushed gravel, stack blocks with setback, backfill gravel behind wall in 8-inch lifts compacted.
Glue cap units, top-dress behind wall with soil, test drain flow with hose, and landscape finish grade.
Calculates block units including caps and corner blocks for wall dimensions.
Sizes perforated drain pipe behind wall to prevent hydrostatic failure.
Estimates backfill gravel volume for drain zone and footing base.
Plans finish grade soil depth above drain zone behind wall.
Retaining Wall Limits
| Height (ft) | Engineering | Geogrid |
|---|---|---|
| Under 3 | DIY typical | Optional |
| 3–4 | Check local code | Usually required |
| Over 4 | Engineer required | Required |
Combine trenching for irrigation, drainage, and low-voltage lighting in one pass when possible.
Match plant mature size to spacing calculators — overcrowding creates maintenance debt for years.
Wear eye and ear protection when cutting pavers, blocks, or running plate compactors.