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Im looking to build a 11.2m long x 1.2m high retaining wall. Of which the top 700 is soil and 500 limestone Does this sound about right? Recommended from a 'skilled friend' 6inch/140mm 7n dence block 10mm mortar 8 courses all laid flat 6 courses 440 deep 2 courses 215 deep Pillars 2 meters...