To limit the probability of inadequate protection against water leakage through cutouts between shingle tabs in the bottom course of shingles, which could lead to precipitation or meltwater ingress, which could lead to deterioration, which could lead to the structural failure of roofs or walls or of assemblies protected by roofs or walls, which could lead to harm to persons.
To exempt constructions from the application of Sentence 9.26.7.2.(1), where the functions of starter strip and eave protection are combined.