To effectively navigate the law requires clearly defining the complex nomenclature. A few of the main terms from Chapter 15 of the Building Code, “Roof Assemblies and Rooftop Structures” are:
Roof Replacement: The process of removing the existing roof covering, repairing any damaged substrate and installing a new roof covering.
Roof Covering: The covering applied to the roof deck for weather resistance, fire classification or appearance.
Roof Deck: The flat or sloped surface not including its supporting members or vertical supports.
Roof Assembly: A system designed to provide weather protection and resistance to design loads. The system consists of a roof covering and roof deck or a single component serving as both the roof covering and the roof deck. A roof assembly includes the roof deck, substrate or thermal barrier, insulation, vapor retarder and roof covering.
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