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Brickie
Blocks
Block count for a wall area.
About 12.5 for a 390 x 190 block.
Blocks
263
Includes wastage5 %
Formula
blocks = area x blocks/m2, plus wastage
20 x 12.5 x 1.05 = 263
About 12.5 standard 390 x 190 blocks per m2 with 10 mm joints.