To limit the probability of localized over-stressing and crushing of wood plates under concentrated roof or floor loads transmitted through framing elements, which could lead to inadequate load distribution, which could lead to over-stressing of hollow masonry units, which could lead to cracking of such units.
Where masonry construction is required to provide fire resistance, this is to limit the probability of compromised fire resistance of the assembly, which could lead to harm to persons.
To exempt situations where another means of distributing roof and floor loads is provided from the application of Sentence 9.20.8.1.(1).