Note: Madison County has areas of suspected and-or areas of known Expansive (shrink-swell) soils. Please see the Expansive Soils Policy on the Document Center page/repository.
Note: per the Virginia Uniform Statewide Building Code:
- Duct Leakage (pressure) Testing is mandatory
- Building Envelope Leakage (blower door) Testing is mandatory
Virginia Residential Code Table R301.2 (1) CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA
| Frost Line Depth | 18 inches |
| Ground Snow Load | 30 PSF |
| Wind Speed (Vult) | 110 MPH |
| Special Wind Region | No |
| Windborne Debris Zone | No |
| Topographical Effects | Yes |
| Residential Seismic Design Category | B |
| Seismic MCER ground motion (period=0.2s) | 0.165 |
| Seismic MCER ground motion (period=1.0s) | 0.061 |
| Weather probability for concrete | Severe |
| Termite infestation probability | Moderate to severe |
| Decay probability | Moderate |
| Ice barrier required | Yes |
| Winter Design Temperature | 10 degrees (F) |
| Air Freezing Index | 500 |
| Mean Annual Temperature | 53 degrees (F) |
Flood Hazards (FEMA SFHA) Initial Entry into the NFIP Current effective date of FIS & FIRM | Yes: Zones A, AE & un-shaded-X April 3, 1989 September 18, 2020 |
The Madison County GIS has separate layers for Expansive (shrink-swell) Soils and FEMA designated special flood hazard areas (flood zones).