A. Adoption Of Standards: All roofs and roofing systems, when first built or when remodeled, shall be constructed to carry a minimum snow load of eighty four (84) pounds per square foot. Builders shall be allowed to use the following coefficients:
1. Reduction For Slope: Snow loads in excess of twenty (20) pounds per square foot (0.96 kN/m2) may be reduced for each degree of pitch over twenty degrees (20°) by Rs as determined by the following formula:
Rs | = | S | - | 1 | |
40 | 2 | ||||
For S: | Rs | = | S | 0.024 | |
40 | |||||
Where: | |||
R
s | = | Snow load reduction in pounds per square foot (kN/m2). | |
S | = | Total snow load in pounds per square foot (kN/m2). | |
2. Values For Occupancy Importance Factor: The following multiplication factors shall be used to increase or decrease the minimum snow loading requirements for building roof systems depending on occupancy:
a. Essential facilities shall have a multiplication factor of 1.15.
b. Any building where the primary occupancy is for assembly use for more than three hundred (300) persons in one room shall have a multiplication factor of 1.15.
c. Agricultural buildings and production greenhouses shall have a multiplication factor of 0.9.
d. All others, including, but not limited to, residential and commercial shall have a multiplication factor of 1.0.
B. Drifting Requirements: All snow loading for roof system calculations shall include the requirements for drifting as set out in the building code.
C. Penalty: Any person violating any provision of this chapter shall be guilty of a misdemeanor and, upon conviction thereof, may be punished as provided in section 1-4-1 of this code. (1998 Code)