Paving slabs can be made with the aid of a simple wooden frame made from 50 mm/2 in deep strips of softwood laid on a level surface. Lay 12 mm of damp sand in the bottom of the frame and cover it with a mix of one part of cement to three parts of sand. Smooth off any surplus with a straight-edge. Leave the concrete for 1.5 hours and then cut through it with a trowel held firmly against a long straight-edge to cut the slabs to the size required. Leave the slabs to harden for a week; then remove the framework and lift them out with a spade.
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