Marking out your swimming pool

Marking out the pool involves drawing a picture of the pool on the garden in the exact position it will be when it’s built, so you know where to excavate. The pool and over dig are marked out with strings ensuring all dimensions are equal and it is perfectly square. A peg is also driven into the ground a short way back from the excavation area to mark the datum line, which denotes the top of the finished pool wall and the point from which all vertical dimensions are taken from. Once this done, the edges of the dig are marked out with builders’ sand, following the string lines.

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