To limit the probability of inadequate fastening of beam members, which could lead to inadequate load distribution between members, which could lead to inadequate bending or shear strength of the built-up beam, which could lead to an inability to resist expected gravity loads, which could lead to failure of the beam, which could lead to structural collapse, which could lead to harm to persons.
To exempt situations where another means of joining built-up wood beams is provided from the application of Sentence 9.23.8.3.(7).