Allan Block AB Classic / Versa-Lok-style large face block. Property-line walls, taller garden walls, anything 3 ft and up.
Continuous run along the long edge of a slope. Cuts only at the corners and end pieces. Industry-standard 5% waste.
Enter wall length and height to see the full BOM — blocks, caps, base aggregate, drainage stone, pipe, fabric, adhesive, and delivery weight.
Engineer-stamped drawing required
Walls 4 ft and taller (or supporting more than 24″ of unbalanced backfill) require a stamped engineer's drawing under IBC R404.5 and most state residential codes. The numbers below are budgetary only — bring the printable spec sheet to your engineer and your local building department before you order.
Geogrid recommended. Walls 3 ft and taller need geogrid lifts (every other course) for soil reinforcement per NCMA TEK 15-8B. Lifts and roll length are included below.
Build list
Blocks
0
incl. waste
Caps
0
top course
Base
0
tons crushed stone
Drainage
0
tons 3/4″ clean
Drain pipe
0 ft
Filter fabric
0 sq ft
Adhesive
0 tubes
Geogrid
0 lifts
0 ft roll
Allan Block Classic 0 courses tall · base depth 6″
Straight run · 0 segment(s) Total weight: 0 lb (0 t)
Estimates only. Walls over 4 ft typically require a stamped engineer's drawing under the IBC + most state residential codes — talk to your local building department before you order. Soils, surcharges (driveways above the wall, drainage from above), frost depth, and seismic zone all affect the engineering load. This calculator is a strong budgetary starting point for the BOM and delivery, not a permit-ready spec.
Retaining wall calculator by DIYRated · Reviewed by Jake Morrison, Licensed GC