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Any structural element of an existing building subjected to additional loads from the effects of snow drift as a result of an addition shall comply with the International Building Code.
Exceptions:
  1. Structural elements whose stress is not increased by more than 5 percent.
  2. Buildings of Group R occupancy with no more than five dwelling units or sleeping units used solely for residential purposes where the existing building and the addition comply with the conventional light-frame construction methods of the International Building Code or the provisions of the International Residential Code.
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Related Code Sections

1103.4 Additions, Snow Drift Loads
Any structural element of an existing building subjected to additional loads from the effects of snow drift as a result of an addition shall comply ...
1603.1.3 Structural Design, Roof Snow Load Data
Snow exposure factor, Ce. Snow load importance factor, Is. Thermal factor, Ct. Drift surcharge load(s), Pd, where the sum of Pd and Pf ...
1603.1.3 Structural Design, Roof Snow Load Data
Snow exposure factor, Ce. Snow load importance factor, Is. Thermal factor, Ct. Slope factor(s), Cs. Drift surcharge load(s), pd, where the sum ...