Design Criteria


The following load criteria are based on Chapter 16 of the 2015 Virginia Construction Code, and Chapter 3 of the 2015 Virginia Residential Code.

Load Criteria


Ground snow load 25 PSF (pounds per square foot)
Wind speed 115 miles per hour three second gust
 89 miles per hour fastest wind speed
Earthquake spectral response .16 at short periods
Residential seismic design category B
Weathering probability for concrete Severe
Termite infestation probability Moderate to heavy
Decay probability Moderate
Ice / water shield required Yes
Winter design temperature 17 degrees Fahrenheit
Air freezing index Less than or equal to 1,500 degrees Fahrenheit
Frost depth 24 inches
Mean annual temperature 50 degrees Fahrenheit