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This addendum to ASHRAE Standard 105-2007 revises the definition of "Gross Floor Area" of a building. The definition chosen reflects a general agreement among a number of interested ASHRAE parties and the Standard Project Committee 105 for what will be referenced within a number of ASHRAE standards. This definition is for use in energy analysis work and does not necessarily reflect the exact definition used by other organizations.

During development, there was significant discussion concerning if and how to include parking garages. Although there are a number of enclosed and even semiheated parking garages, the decision was that permitting parking garage area to be included in the calculation of building floor area would skew the reporting of building energy use intensity when presented in terms of energy use per square foot of floor area. Alternatives for incorporating parking garage energy into the relevant equations are being examined by the committee.