Here, scaffolding is being used to either protect a large skylight or to provide access to that skylight for maintenance. Rental costs for scaffolding are not outrageously expensive, but neither are they cheap. In an earlier interview with the founder and president of Avontus Software, Brian Webb mentioned that a relatively large portion of the maintenance budget for oil refineries (one of his main clients) is spent on scaffolding - to access portions of the refinery that would otherwise be inaccessible.
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