Junctions between vertical assemblies, and sloped
or horizontal assemblies, that are exposed to precipitation, in buildings
to which Part 5 applies [see Sentence
126.96.36.199.(1) of Division A
of Part 5].
To limit the probability of excessive moisture loading on
vertical assemblies, which could lead to precipitation ingress, which could
lead to deterioration, which could lead to compromised structural integrity
of the separators or of elements supported or protected by the separators,
which could lead to structural failure, which could lead to harm to persons.