To supersede the requirements of Sentence 9.10.14.5.(1), which might otherwise require a higher fire-resistance rating, if certain conditions are met.
This is to limit the probability that an exposing building face will have insufficient fire resistance, which could lead to the spread of fire from the subject building to an adjacent building during the time required for emergency responders to perform their duties, which could lead to damage to the adjacent building.
To exempt the exterior cladding of certain detached garages or accessory buildings from the requirements of Sentences 9.10.14.5.(1) and 9.10.14.5.(2), which might otherwise require the cladding to be noncombustible, on the basis that the accessory buildings and garages serve one dwelling unit only and such structures are not expected to be normally occupied.