Drill 12mm holes at horizontal centres no greater than 120mm.
Wall thickness 110mm hole centres 120mm, for 220mm wall thickness 220mm hole centres 120mm.
FLUID REQUIREMENT
For 4.5″ solid brick 3.35 metres = 5 litres or 10ft per gallon
For 9.0″ solid brick 1.65 metres = 5 litres or 5 ft per gallon



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