Adopted edition
Local adoption (no statewide residential code)
Inherits from IL state floor.
IL · County
Jefferson County, IL.
I-57/I-64 junction. Mount Vernon city has
Design wind speed
90 mph
ASCE 7 Risk Cat II, 3-second gust at 33 ft. Drives fastener spacing, hold-downs, and opening protection.
Climate zone (IECC)
4A
Drives R-value, fenestration U-factor, and air-leakage envelope rules.
Special zones
- HVHZ
- WBDR
- WUI
- FEMA SFHA possible
Permit office
Jefferson County County Building Department
Local conditions
- Ground snow load: 15-20 psf
- Frost depth: 30-36".
Working in Jefferson County?
Pull an address-level code packet for any property in Jefferson County. SkyCanvass resolves the parcel, looks up the adopted edition + the Jefferson County-specific amendments listed above, and emits a cited packet ready for permit submittal.
See the Illinois state overview for the broader context, or browse the state directory.
Pull a Jefferson County code packet.
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