To limit the probability that the calculation of snow load will not take into account all the factors that affect the accumulation and distribution of snow on roofs or other building surfaces subject to snow accumulation, which could lead to the excessive deformation of, or excessive stress in, structural elements, which could lead to damage to the building.
To limit the probability that the ground snow load and associated rain load values will not be compatible with the geographic characteristics by directing Code users to Sentence 1.1.3.1.(1) [Appendix C], which could lead to the excessive deformation of, or excessive stress in, structural elements, which could lead to damage to the building.
To limit the probability that the calculation of snow load used for the design will not take into account the level of reliability appropriate for deflection serviceability, which could lead to the excessive deformation of, or excessive stress in, structural elements, which could lead to damage to the building.