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Recess covers are best fitted after most of the surrounding paving is laid, but, in the case of block or brick paving, before final compaction. The paving should be temporarily stopped around 250mm from the manhole or inspection chamber (IC) to allow room to work and enable the paving to be 'pieced-in' accurately once the cover is fitted.
Leaving the existing cover in place, to prevent spoil falling into the drain, dig out all the way around the IC about 250mm wide, and approximately 100mm deeper than the bedding layer level.