Where flat roof snow loads exceed 30 psf 1 44 kn m 2 20 percent shall be combined with seismic loads.
Minimum roof live load ibc.
Where uniform roof live loads are reduced to less than 20 psf 0 96 kn m2 in accordance with section 1607 12 2 1 and are applied to the design of structural members arranged so as to create continulty the reduced roof live load shall be applied to adjacent spans or to alternate spans whichever produces the most unfavorable load effect.
0 9d 1 0w a load factor of 1 6 when adding to load 7.
If none specified pf will be calculated per asce 7 ibc.
These elements are now required to be designed for 75psf if they happen to be less than 10 feet.
Prior to the 2012 ibc these roofs were designed for standard roof live loads or local ground snow loads typically in the range of 20 or 30 pounds per square foot.
1 2d 1 0e l 0 2s when h loads are present they shall have 6.
Where uniform roof live loads are reduced to less than 20 psf 0 96 kn m2 in accordance with section 1607 11 2 1 and are involved in the design of structural members arranged so as to create continuity the minimum applied loads shall be the full dead loads on all spans in combination with the roof live loads on adjacent spans or on alternate spans whichever produces the greatest effect.
According to ibc 2003 table 1607 1 the minimum uniformly distributed live loads and minimum concentrated live loads are as follow.
Calculated as per asce 7 16 based on the risk category.
Occupancy or use uniform psf concentrated lbs office building office lobbies and first floor corridors corridor above first floor 50 100 80 2000 2000.
Minimum uniformly distributed live loads adapted from sei asce 7 10.
Where flat roof snow loads exceed 30 psf 1 44 kn m 2 20 percent shall be combined with seismic loads.
Dead and live loads international building code 2003 ibc 1607 1.
The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.
The ibc allows non classified roof coverings to be used on residential group r 3 see ibc section 310 5 and group u see ibc section 312 buildings such as agricultural buildings barns carports if the separation between the leading edges of the adjacent roofs is less than 6 feet unless otherwise required by local requirements such as the international wildland urban interface code.
The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.
Section 1603 1 3 ground snow load pg minimum ground snow load shall be 30 psf county amendment minimum flat roof snow load pf if applicable.
Flat roof snow loads of 30 psf 1 44 kn m 2 or less and roof live loads of 30 psf 1 44 kn m 2 or less need not be combined with seismic loads.
Minimum roof live load is 30psf.
Minimum sloped roof snow load ps if applicable.
County amendment d snow loads.
