Illustration Source: Summerhill

9.36.2.1. (2) The requirements of this Subsection also apply to components of a building envelope assembly that separate a conditioned space from an adjoining storage garage , even if the storage garage is intended to be heated.

A-9.36.2.1. (2) Wall or Floor between a Garage and a Conditional Space . A wall or a floor between conditioned space and a residential garage must be airtight and insulated because, even if the garage is equipped with space-heating equipment, it may in fact be kept unheated most of the time.