The work size for calcium silicate bricks is 215 X 102.5 X 65 mm, the same as for clay bricks, with a co-ordinating size of 225 X 112.5 X 75 mm, allowing
for 10 mm mortar joints. Generally, calcium silicate bricks are more accurate in form and size than fired clay bricks, which inevitably distort in the manufacturing process. The dimensional tolerances for calcium silicate bricks defined in the standard (BS EN 771-2: 2003) are generally ±2 mm on each dimension, except for thin layer mortar when a maximum of only ± 1 mm tolerance is permitted on the height.
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