Climatic and Geographic Design Criteria
Minimum requirements for Casper, Wyoming, are as follows:
Ground and roof snow loads: 30# for all structures.
Wind speeds: 1 & 2 Family Dwellings - equivalent basic wind speed table 93 mph fastest mile Vfm and 115 mph, 3 second gust V3s.
All other structures - 2015 IBC, Chapter 16, Section 1609 wind speed conversion tables and maps.
Seismic Design: Category "B" Latitude 42.85 Longitude -106.32
Frost line depth: 3 feet to top of footing
Termite: none to slight[sw15] [c16]
Decay: none to slight
Winter design temperature: negative 10 degrees
Ice shield: no
Air freezing index: 3,000
Mean annual temperature: 44.5 degrees
Stormwater sizing: 3 inches of rainfall per hour
Programs for some foundation designs are available through the office