Used roof
Added to a building package with the building base fee; not sold on its own. For a used roof: its facilities and shades, and the unit is per roof.
The building base fee includes the roof among the common parts; this item is added for the facilities and shades of a roof in use. The engineer checks the numbers at the first visit: any excess is charged and any shortfall refunded.
Repairs and parts are not included; you get their price before any work.