To ensure a level finish when laying foundations for brickwork. Insert a series of wooden pegs about 600 mm/2 ft apart into the earth at the base of the trench. Leave each peg protruding above the ground to the exact depth of the concrete foundation – this should normally be 100mm 4in for single-brick walls and 150mm 6 in for double-brick walls. Lay a straight-edge across the pegs, two at a time, and use a spirit level to check that they are all at the same height. Pour a mix of one part of cement, two parts of sand and four parts of aggregate – or one part of cement and six parts of all-in’ aggregate, obtainable from builders merchants – into the trench until it is level with the top of the pegs.
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