Technical section detail for a 9-foot high retaining wall using interlocking concrete blocks. The drawing provides specific assembly instructions for a tiered structure with a 1 5/8-inch setback, utilizing 41-inch deep solid bottom blocks and 28-inch deep middle and top units.
Material specifications include a 1’x48″ crushed stone compacted base, a 6-inch perforated drain pipe, and non-woven geotextile fabric. The detail illustrates 2 feet of minimum backfill material, stone or crushed concrete infill for vertical core slots, and grading requirements for surface water drainage. Annotations define the interface between the wall assembly and undisturbed soil.
