Section 250.TABLE G Insulation/Building Perimeter

1) Zones for insulation/building perimeter requirements shall consist of the counties listed here.

Zone 1 includes the following counties:
Boone	Ford	Kane	Lee	Ogle	Tazewell
Bureau	Grundy	Kankakee	Livingston	Peoria	Warren
Carroll	Henderson	Kendall	Marshall	Putnam	Whiteside
Cook	Henry	Knox	McHenry	Rock Island	Will
DeKalb	Iroquois	Lake	McLean	Stark	Winnebago
DuPage	JoDaviess	LaSalle	Mercer	Stephenson	Woodford

Zone 2 includes the following counties:
Adams	Clark	Effingham	Jersey	McDonough	Pike
Bond	Coles	Fayette	Logan	Menard	Sangamon
Brown	Crawford	Fulton	Macon	Montgomery	Schuyler
Calhoun	Cumberland	Greene	Macoupin	Morgan	Scott
Cass	DeWitt	Hancock	Madison	Moultrie	Shelby
Champaign	Douglas	Jasper	Mason	Piatt	Vermilion
Christian	Edgar

Zone 3 includes the following counties:
Alexander	Gallatin	Johnson	Perry	St. Clair	Washington
Clay	Hamilton	Lawrence	Pope	Saline	Wayne
Clinton	Hardin	Marion	Pulaski	Union	White
Edwards	Jackson	Massac	Randolph	Wabash	Williamson
Franklin	Jefferson	Monroe	Richland

2) The following minimum building perimeter insulation R values shall be provided:

	Roof	Walls	Floors
Zone 1	R-20	R-17	R-19
Zone 2	R-18	R-17	R-19
Zone 3	R-15	R-12	R-11

3) All windows shall be glazed with double glazed insulating glass. All exterior windows and door frames shall be constructed of non-cold conducting materials such as wood or metal with a thermal break.

(Source: Amended at 12 Ill. Reg. 15080, effective October 1, 1988)