Coverage measured against exposed floor
A room described as thirty square metres will be invoiced and judged as thirty square metres, and if only ten are reachable then the arrangement is misaligned from the first attendance. Nobody set out to mislead anybody; the specification was simply written from a plan rather than from the room. Correcting it costs a sentence and it removes the most common source of dissatisfaction in small storage areas.
Once the exposed area is stated, the rotation follows naturally. The premises nominates a section to clear before each attendance, that section is cleaned properly, and over a stated cycle the whole floor is covered. It is more work for the occupier than doing nothing and considerably less than the alternative of never having a clean floor at all. Most premises find one section a fortnight is manageable alongside everything else.
