CODES

ADOPTS WITH AMENDMENTS:

International Energy Conservation Code 2012 (IECC 2012)

Climate zones from Figure C301.1 or Table C301.1 shall be used in determining the applicable requirements from Chapter 4. Locations not in Table C301.1 (outside the United States) shall be assigned a climate zone based on Section C301.3.

FIGURE C301.1
CLIMATE ZONES

TABLE C301.1 CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID
DESIGNATIONS BY STATE, COUNTY AND TERRITORY

Key: A – Moist, B – Dry, C – Marine. Absence of moisture designation indicates moisture regime is irrelevant. Asterisk (*) indicates a warm-humid location.
US STATES
ALABAMA3A Lee7 Kodiak Island3A Calhoun3A Monroe
3A Limestone7 Lake and Peninsula4A Carroll3A Montgomery
3A Autauga*3A Lowndes*7 Matanuska-Susitna3A Chicot3A Nevada
2A Baldwin*3A Macon*8 Nome3A Clark4A Newton
3A Barbour*3A Madison8 North Slope3A Clay3A Ouachita
3A Bibb3A Marengo*8 Northwest Arctic3A Cleburne3A Perry
3A Blount3A Marion7 Prince of Wales3A Cleveland3A Phillips
3A Bullock*3A MarshallOuter Ketchikan3A Columbia*3A Pike
3A Butler*2A Mobile*7 Sitka3A Conway3A Poinsett
3A Calhoun3A Monroe*7 Skagway-Hoonah3A Craighead3A Polk
3A Chambers3A Montgomery*Angoon3A Crawford3A Pope
3A Cherokee3A Morgan8 Southeast Fairbanks3A Crittenden3A Prairie
3A Chilton3A Perry*7 Valdez-Cordova3A Cross3A Pulaski
3A Choctaw*3A Pickens8 Wade Hampton3A Dallas3A Randolph
3A Clarke*3A Pike*7 Wrangell-Petersburg3A Desha3A Saline
3A Clay3A Randolph7 Yakutat3A Drew3A Scott
3A Cleburne3A Russell*8 Yukon-Koyukuk3A Faulkner4A Searcy
3A Coffee*3A ShelbyARIZONA3A Franklin3A Sebastian
3A Colbert3A St. Clair5B Apache4A Fulton3A Sevier*
3A Conecuh*3A Sumter3B Cochise3A Garland3A Sharp
3A Coosa3A Talladega5B Coconino3A Grant3A St. Francis
3A Covington*3A Tallapoosa4B Gila3A Greene4A Stone
3A Crenshaw*3A Tuscaloosa3B Graham3A Hempstead*3A Union*
3A Cullman3A Walker3B Greenlee3A Hot Spring3A Van Buren
3A Dale*3A Washington*2B La Paz3A Howard4A Washington
3A Dallas*3A Wilcox*2B Maricopa3A Independence3A White
3A DeKalb3A Winston3B Mohave4A Izard3A Woodruff
3A Elmore*ALASKA5B Navajo3A Jackson3A Yell
3A Escambia*2B Pima3A JeffersonCALIFORNIA
3A Etowah7 Aleutians East2B Pinal3A Johnson
3A Fayette7 Aleutians West3B Santa Cruz3A Lafayette*3C Alameda
3A Franklin7 Anchorage4B Yavapai3A Lawrence6B Alpine
3A Geneva*8 Bethel2B Yuma3A Lee4B Amador
3A Greene7 Bristol BayARKANSAS3A Lincoln3B Butte
3A Hale7 Denali3A Little River*4B Calaveras
3A Henry*8 Dillingham3A Arkansas3A Logan3B Colusa
3A Houston*8 Fairbanks North Star3A Ashley3A Lonoke3B Contra Costa
3A Jackson7 Haines4A Baxter4A Madison4C Del Norte
3A Jefferson7 Juneau4A Benton4A Marion4B El Dorado
3A Lamar7 Kenai Peninsula4A Boone3A Miller*3B Fresno
3A Lauderdale7 Ketchikan Gateway3A Bradley3A Mississippi3B Glenn
3A Lawrence

(continued)

TABLE C301.1—continued
CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID
DESIGNATIONS BY STATE, COUNTY AND TERRITORY

4C Humboldt3B Yuba5B Morgan2A Escambia*2A Taylor*
2B ImperialCOLORADO4B Otero2A Flagler*2A Union*
4B Inyo6B Ouray2A Franklin*2A Volusia*
3B Kern5B Adams7 Park2A Gadsden*2A Wakulla*
3B Kings6B Alamosa5B Phillips2A Gilchrist*2A Walton*
4B Lake5B Arapahoe7 Pitkin2A Glades*2A Washington*
5B Lassen6B Archuleta5B Prowers2A Gulf*GEORGIA
3B Los Angeles4B Baca5B Pueblo2A Hamilton*
3B Madera5B Bent6B Rio Blanco2A Hardee*2A Appling*
3C Marin5B Boulder7 Rio Grande2A Hendry*2A Atkinson*
4B Mariposa6B Chaffee7 Routt2A Hernando*2A Bacon*
3C Mendocino5B Cheyenne6B Saguache2A Highlands*2A Baker*
3B Merced7 Clear Creek7 San Juan2A Hillsborough*3A Baldwin
5B Modoc6B Conejos6B San Miguel2A Holmes*4A Banks
6B Mono6B Costilla5B Sedgwick2A Indian River*3A Barrow
3C Monterey5B Crowley7 Summit2A Jackson*3A Bartow
3C Napa6B Custer5B Teller2A Jefferson*3A Ben Hill*
5B Nevada5B Delta5B Washington2A Lafayette*2A Berrien*
3B Orange5B Denver5B Weld2A Lake*3A Bibb
3B Placer6B Dolores5B Yuma2A Lee*3A Bleckley*
5B Plumas5B DouglasCONNECTICUT2A Leon*2A Brantley*
3B Riverside6B Eagle2A Levy*2A Brooks*
3B Sacramento5B Elbert5A (all)2A Liberty*2A Bryan*
3C San Benito5B El PasoDELAWARE2A Madison*3A Bulloch*
3B San Bernardino5B Fremont2A Manatee*3A Burke
3B San Diego5B Garfield4A (all)2A Marion*3A Butts
3C San Francisco5B GilpinDISTRICT OF COLUMBIA2A Martin*3A Calhoun*
3B San Joaquin7 Grand1A Miami-Dade*2A Camden*
3C San Luis Obispo7 Gunnison4A (all)1A Monroe*3A Candler*
3C San Mateo7 HinsdaleFLORIDA2A Nassau*3A Carroll
3C Santa Barbara5B Huerfano2A Okaloosa*4A Catoosa
3C Santa Clara7 Jackson2A Alachua*2A Okeechobee*2A Charlton*
3C Santa Cruz5B Jefferson2A Baker*2A Orange*2A Chatham*
3B Shasta5B Kiowa2A Bay*2A Osceola*3A Chattahoochee*
5B Sierra5B Kit Carson2A Bradford*2A Palm Beach*4A Chattooga
5B Siskiyou7 Lake2A Brevard*2A Pasco*3A Cherokee
3B Solano5B La Plata1A Broward*2A Pinellas*3A Clarke
3C Sonoma5B Larimer2A Calhoun*2A Polk*3A Clay*
3B Stanislaus4B Las Animas2A Charlotte*2A Putnam*3A Clayton
3B Sutter5B Lincoln2A Citrus*2A Santa Rosa*2A Clinch*
3B Tehama5B Logan2A Clay*2A Sarasota*3A Cobb
4B Trinity5B Mesa2A Collier*2A Seminole*3A Coffee*
3B Tulare7 Mineral2A Columbia*2A St. Johns*2A Colquitt*
4B Tuolumne6B Moffat2A DeSoto*2A St. Lucie*3A Columbia
3C Ventura5B Montezuma2A Dixie*2A Sumter*2A Cook*
3B Yolo5B Montrose2A Duval*2A Suwannee*3A Coweta

(continued)

TABLE C301.1—continued
CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID
DESIGNATIONS BY STATE, COUNTY AND TERRITORY

3A Crawford2A Lanier*3A Taylor*5B Cassia4A Crawford
3A Crisp*3A Laurens*3A Telfair*6B Clark5A Cumberland
4A Dade3A Lee*3A Terrell*5B Clearwater5A DeKalb
4A Dawson2A Liberty*2A Thomas*6B Custer5A De Witt
2A Decatur*3A Lincoln3A Tift*5B Elmore5A Douglas
3A DeKalb2A Long*2A Toombs*6B Franklin5A DuPage
3A Dodge*2A Lowndes*4A Towns6B Fremont5A Edgar
3A Dooly*4A Lumpkin3A Treutlen*5B Gem4A Edwards
3A Dougherty*3A Macon*3A Troup5B Gooding4A Effingham
3A Douglas3A Madison3A Turner*5B Idaho4A Fayette
3A Early*3A Marion*3A Twiggs*6B Jefferson5A Ford
2A Echols*3A McDuffie4A Union5B Jerome4A Franklin
2A Effingham*2A McIntosh*3A Upson5B Kootenai5A Fulton
3A Elbert3A Meriwether4A Walker5B Latah4A Gallatin
3A Emanuel*2A Miller*3A Walton6B Lemhi5A Greene
2A Evans*2A Mitchell*2A Ware*5B Lewis5A Grundy
4A Fannin3A Monroe3A Warren5B Lincoln4A Hamilton
3A Fayette3A Montgomery*3A Washington6B Madison5A Hancock
4A Floyd3A Morgan2A Wayne*5B Minidoka4A Hardin
3A Forsyth4A Murray3A Webster*5B Nez Perce5A Henderson
4A Franklin3A Muscogee3A Wheeler*6B Oneida5A Henry
3A Fulton3A Newton4A White5B Owyhee5A Iroquois
4A Gilmer3A Oconee4A Whitfield5B Payette4A Jackson
3A Glascock3A Oglethorpe3A Wilcox*5B Power4A Jasper
2A Glynn*3A Paulding3A Wilkes5B Shoshone4A Jefferson
4A Gordon3A Peach*3A Wilkinson6B Teton5A Jersey
2A Grady*4A Pickens3A Worth*5B Twin Falls5A Jo Daviess
3A Greene2A Pierce*HAWAII6B Valley4A Johnson
3A Gwinnett3A Pike5B Washington5A Kane
4A Habersham3A Polk1A (all)*ILLINOIS5A Kankakee
4A Hall3A Pulaski*IDAHO5A Kendall
3A Hancock3A Putnam5A Adams5A Knox
3A Haralson3A Quitman*5B Ada4A Alexander5A Lake
3A Harris4A Rabun6B Adams4A Bond5A La Salle
3A Hart3A Randolph*6B Bannock5A Boone4A Lawrence
3A Heard3A Richmond6B Bear Lake5A Brown5A Lee
3A Henry3A Rockdale5B Benewah5A Bureau5A Livingston
3A Houston*3A Schley*6B Bingham5A Calhoun5A Logan
3A Irwin*3A Screven*6B Blaine5A Carroll5A Macon
3A Jackson2A Seminole*6B Boise5A Cass4A Macoupin
3A Jasper3A Spalding6B Bonner5A Champaign4A Madison
2A Jeff Davis*4A Stephens6B Bonneville4A Christian4A Marion
3A Jefferson3A Stewart*6B Boundary5A Clark5A Marshall
3A Jenkins*3A Sumter*6B Butte4A Clay5A Mason
3A Johnson*3A Talbot6B Camas4A Clinton4A Massac
3A Jones3A Taliaferro5B Canyon5A Coles5A McDonough
3A Lamar2A Tattnall*6B Caribou5A Cook5A McHenry

(continued)

TABLE C301.1—continued
CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID
DESIGNATIONS BY STATE, COUNTY AND TERRITORY

5A McLean5A Boone5A Miami5A Appanoose5A Jasper
5A Menard4A Brown4A Monroe5A Audubon5A Jefferson
5A Mercer5A Carroll5A Montgomery5A Benton5A Johnson
4A Monroe5A Cass5A Morgan6A Black Hawk5A Jones
4A Montgomery4A Clark5A Newton5A Boone5A Keokuk
5A Morgan5A Clay5A Noble6A Bremer6A Kossuth
5A Moultrie5A Clinton4A Ohio6A Buchanan5A Lee
5A Ogle4A Crawford4A Orange6A Buena Vista5A Linn
5A Peoria4A Daviess5A Owen6A Butler5A Louisa
4A Perry4A Dearborn5A Parke6A Calhoun5A Lucas
5A Piatt5A Decatur4A Perry5A Carroll6A Lyon
5A Pike5A De Kalb4A Pike5A Cass5A Madison
4A Pope5A Delaware5A Porter5A Cedar5A Mahaska
4A Pulaski4A Dubois4A Posey6A Cerro Gordo5A Marion
5A Putnam5A Elkhart5A Pulaski6A Cherokee5A Marshall
4A Randolph5A Fayette5A Putnam6A Chickasaw5A Mills
4A Richland4A Floyd5A Randolph5A Clarke6A Mitchell
5A Rock Island5A Fountain4A Ripley6A Clay5A Monona
4A Saline5A Franklin5A Rush6A Clayton5A Monroe
5A Sangamon5A Fulton4A Scott5A Clinton5A Montgomery
5A Schuyler4A Gibson5A Shelby5A Crawford5A Muscatine
5A Scott5A Grant4A Spencer5A Dallas6A O’Brien
4A Shelby4A Greene5A Starke5A Davis6A Osceola
5A Stark5A Hamilton5A Steuben5A Decatur5A Page
4A St. Clair5A Hancock5A St. Joseph6A Delaware6A Palo Alto
5A Stephenson4A Harrison4A Sullivan5A Des Moines6A Plymouth
5A Tazewell5A Hendricks4A Switzerland6A Dickinson6A Pocahontas
4A Union5A Henry5A Tippecanoe5A Dubuque5A Polk
5A Vermilion5A Howard5A Tipton6A Emmet5A Pottawattamie
4A Wabash5A Huntington5A Union6A Fayette5A Poweshiek
5A Warren4A Jackson4A Vanderburgh6A Floyd5A Ringgold
4A Washington5A Jasper5A Vermillion6A Franklin6A Sac
4A Wayne5A Jay5A Vigo5A Fremont5A Scott
4A White4A Jefferson5A Wabash5A Greene5A Shelby
5A Whiteside4A Jennings5A Warren6A Grundy6A Sioux
5A Will5A Johnson4A Warrick5A Guthrie5A Story
4A Williamson4A Knox4A Washington6A Hamilton5A Tama
5A Winnebago5A Kosciusko5A Wayne6A Hancock5A Taylor
5A Woodford5A Lagrange5A Wells6A Hardin5A Union
INDIANA5A Lake5A White5A Harrison5A Van Buren
5A La Porte5A Whitley5A Henry5A Wapello
5A Adams4A LawrenceIOWA6A Howard5A Warren
5A Allen5A Madison6A Humboldt5A Washington
5A Bartholomew5A Marion5A Adair6A Ida5A Wayne
5A Benton5A Marshall5A Adams5A Iowa6A Webster
5A Blackford4A Martin6A Allamakee5A Jackson6A Winnebago

(continued)

TABLE C301.1—continued
CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID
DESIGNATIONS BY STATE, COUNTY AND TERRITORY

6A Winneshiek4A Haskell4A Sedgwick2A Iberville*6A Cumberland
5A Woodbury4A Hodgeman4A Seward3A Jackson*6A Franklin
6A Worth4A Jackson4A Shawnee2A Jefferson*6A Hancock
6A Wright4A Jefferson5A Sheridan2A Jefferson Davis*6A Kennebec
KANSAS5A Jewell5A Sherman2A Lafayette*6A Knox
4A Johnson5A Smith2A Lafourche*6A Lincoln
4A Allen4A Kearny4A Stafford3A La Salle*6A Oxford
4A Anderson4A Kingman4A Stanton3A Lincoln*6A Penobscot
4A Atchison4A Kiowa4A Stevens2A Livingston*6A Piscataquis
4A Barber4A Labette4A Sumner3A Madison*6A Sagadahoc
4A Barton5A Lane5A Thomas3A Morehouse6A Somerset
4A Bourbon4A Leavenworth5A Trego3A Natchitoches*6A Waldo
4A Brown4A Lincoln4A Wabaunsee2A Orleans*6A Washington
4A Butler4A Linn5A Wallace3A Ouachita*6A York
4A Chase5A Logan4A Washington2A Plaquemines*MARYLAND
4A Chautauqua4A Lyon5A Wichita2A Pointe Coupee*
4A Cherokee4A Marion4A Wilson2A Rapides*4A Allegany
5A Cheyenne4A Marshall4A Woodson3A Red River*4A Anne Arundel
4A Clark4A McPherson4A Wyandotte3A Richland*4A Baltimore
4A Clay4A MeadeKENTUCKY3A Sabine*4A Baltimore (city)
5A Cloud4A Miami2A St. Bernard*4A Calvert
4A Coffey5A Mitchell4A (all)2A St. Charles*4A Caroline
4A Comanche4A MontgomeryLOUISIANA2A St. Helena*4A Carroll
4A Cowley4A Morris2A St. James*4A Cecil
4A Crawford4A Morton2A Acadia*2A St. John the4A Charles
5A Decatur4A Nemaha2A Allen*Baptist*4A Dorchester
4A Dickinson4A Neosho2A Ascension*2A St. Landry*4A Frederick
4A Doniphan5A Ness2A Assumption*2A St. Martin*5A Garrett
4A Douglas5A Norton2A Avoyelles*2A St. Mary*4A Harford
4A Edwards4A Osage2A Beauregard*2A St. Tammany*4A Howard
4A Elk5A Osborne3A Bienville*2A Tangipahoa*4A Kent
5A Ellis4A Ottawa3A Bossier*3A Tensas*4A Montgomery
4A Ellsworth4A Pawnee3A Caddo*2A Terrebonne*4A Prince George’s
4A Finney5A Phillips2A Calcasieu*3A Union*4A Queen Anne’s
4A Ford4A Pottawatomie3A Caldwell*2A Vermilion*4A Somerset
4A Franklin4A Pratt2A Cameron*3A Vernon*4A St. Mary’s
4A Geary5A Rawlins3A Catahoula*2A Washington*4A Talbot
5A Gove4A Reno3A Claiborne*3A Webster*4A Washington
5A Graham5A Republic3A Concordia*2A West Baton4A Wicomico
4A Grant4A Rice3A De Soto*Rouge*4A Worcester
4A Gray4A Riley2A East Baton Rouge*3A West CarrollMASSACHSETTS
5A Greeley5A Rooks3A East Carroll2A West Feliciana*
4A Greenwood4A Rush2A East Feliciana*3A Winn*5A (all)
5A Hamilton4A Russell2A Evangeline*MAINEMICHIGAN
4A Harper4A Saline3A Franklin*
4A Harvey5A Scott3A Grant*6A Androscoggin6A Alcona
2A Iberia*7 Aroostook6A Alger

(continued)

TABLE C301.1—continued
CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID
DESIGNATIONS BY STATE, COUNTY AND TERRITORY

5A Allegan7 Mackinac6A Carver7 Otter Tail3A Clarke
6A Alpena5A Macomb7 Cass7 Pennington3A Clay
6A Antrim6A Manistee6A Chippewa7 Pine3A Coahoma
6A Arenac6A Marquette6A Chisago6A Pipestone3A Copiah*
7 Baraga6A Mason7 Clay7 Polk3A Covington*
5A Barry6A Mecosta7 Clearwater6A Pope3A DeSoto
5A Bay6A Menominee7 Cook6A Ramsey3A Forrest*
6A Benzie5A Midland6A Cottonwood7 Red Lake3A Franklin*
5A Berrien6A Missaukee7 Crow Wing6A Redwood3A George*
5A Branch5A Monroe6A Dakota6A Renville3A Greene*
5A Calhoun5A Montcalm6A Dodge6A Rice3A Grenada
5A Cass6A Montmorency6A Douglas6A Rock2A Hancock*
6A Charlevoix5A Muskegon6A Faribault7 Roseau2A Harrison*
6A Cheboygan6A Newaygo6A Fillmore6A Scott3A Hinds*
7 Chippewa5A Oakland6A Freeborn6A Sherburne3A Holmes
6A Clare6A Oceana6A Goodhue6A Sibley3A Humphreys
5A Clinton6A Ogemaw7 Grant6A Stearns3A Issaquena
6A Crawford7 Ontonagon6A Hennepin6A Steele3A Itawamba
6A Delta6A Osceola6A Houston6A Stevens2A Jackson*
6A Dickinson6A Oscoda7 Hubbard7 St. Louis3A Jasper
5A Eaton6A Otsego6A Isanti6A Swift3A Jefferson*
6A Emmet5A Ottawa7 Itasca6A Todd3A Jefferson Davis*
5A Genesee6A Presque Isle6A Jackson6A Traverse3A Jones*
6A Gladwin6A Roscommon7 Kanabec6A Wabasha3A Kemper
7 Gogebic5A Saginaw6A Kandiyohi7 Wadena3A Lafayette
6A Grand Traverse6A Sanilac7 Kittson6A Waseca3A Lamar*
5A Gratiot7 Schoolcraft7 Koochiching6A Washington3A Lauderdale
5A Hillsdale5A Shiawassee6A Lac qui Parle6A Watonwan3A Lawrence*
7 Houghton5A St. Clair7 Lake7 Wilkin3A Leake
6A Huron5A St. Joseph7 Lake of the Woods6A Winona3A Lee
5A Ingham5A Tuscola6A Le Sueur6A Wright3A Leflore
5A Ionia5A Van Buren6A Lincoln6A Yellow3A Lincoln*
6A Iosco5A Washtenaw6A LyonMedicine3A Lowndes
7 Iron5A Wayne7 MahnomenMISSISSIPPI3A Madison
6A Isabella6A Wexford7 Marshall3A Marion*
5A JacksonMINNESOTA6A Martin3A Adams*3A Marshall
5A Kalamazoo6A McLeod3A Alcorn3A Monroe
6A Kalkaska7 Aitkin6A Meeker3A Amite*3A Montgomery
5A Kent6A Anoka7 Mille Lacs3A Attala3A Neshoba
7 Keweenaw7 Becker6A Morrison3A Benton3A Newton
6A Lake7 Beltrami6A Mower3A Bolivar3A Noxubee
5A Lapeer6A Benton6A Murray3A Calhoun3A Oktibbeha
6A Leelanau6A Big Stone6A Nicollet3A Carroll3A Panola
5A Lenawee6A Blue Earth6A Nobles3A Chickasaw2A Pearl River*
5A Livingston6A Brown7 Norman3A Choctaw3A Perry*
7 Luce7 Carlton6A Olmsted3A Claiborne*3A Pike*

(continued)

TABLE C301.1—continued
CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID
DESIGNATIONS BY STATE, COUNTY AND TERRITORY

3A Pontotoc5A Chariton4A Mississippi4A Webster4A Cumberland
3A Prentiss4A Christian4A Moniteau5A Worth4A Essex
3A Quitman5A Clark4A Monroe4A Wright4A Gloucester
3A Rankin*4A Clay4A MontgomeryMONTANA4A Hudson
3A Scott5A Clinton4A Morgan5A Hunterdon
3A Sharkey4A Cole4A New Madrid6B (all)5A Mercer
3A Simpson*4A Cooper4A NewtonNEBRASKA4A Middlesex
3A Smith*4A Crawford5A Nodaway4A Monmouth
2A Stone*4A Dade4A Oregon5A (all)5A Morris
3A Sunflower4A Dallas4A OsageNEVADA4A Ocean
3A Tallahatchie5A Daviess4A Ozark5A Passaic
3A Tate5A DeKalb4A Pemiscot5B Carson City (city)4A Salem
3A Tippah4A Dent4A Perry5B Churchill5A Somerset
3A Tishomingo4A Douglas4A Pettis3B Clark5A Sussex
3A Tunica4A Dunklin4A Phelps5B Douglas4A Union
3A Union4A Franklin5A Pike5B Elko5A Warren
3A Walthall*4A Gasconade4A Platte5B EsmeraldaNEW MEXICO
3A Warren*5A Gentry4A Polk5B Eureka
3A Washington4A Greene4A Pulaski5B Humboldt4B Bernalillo
3A Wayne*5A Grundy5A Putnam5B Lander5B Catron
3A Webster5A Harrison5A Ralls5B Lincoln3B Chaves
3A Wilkinson*4A Henry4A Randolph5B Lyon4B Cibola
3A Winston4A Hickory4A Ray5B Mineral5B Colfax
3A Yalobusha5A Holt4A Reynolds5B Nye4B Curry
3A Yazoo4A Howard4A Ripley5B Pershing4B DeBaca
MISSOURI4A Howell4A Saline5B Storey3B Dona Ana
4A Iron5A Schuyler5B Washoe3B Eddy
5A Adair4A Jackson5A Scotland5B White Pine4B Grant
5A Andrew4A Jasper4A ScottNEW HAMPSHIRE4B Guadalupe
5A Atchison4A Jefferson4A Shannon5B Harding
4A Audrain4A Johnson5A Shelby6A Belknap3B Hidalgo
4A Barry5A Knox4A St. Charles6A Carroll3B Lea
4A Barton4A Laclede4A St. Clair5A Cheshire4B Lincoln
4A Bates4A Lafayette4A Ste. Genevieve6A Coos5B Los Alamos
4A Benton4A Lawrence4A St. Francois6A Grafton3B Luna
4A Bollinger5A Lewis4A St. Louis5A Hillsborough5B McKinley
4A Boone4A Lincoln4A St. Louis (city)6A Merrimack5B Mora
5A Buchanan5A Linn4A Stoddard5A Rockingham3B Otero
4A Butler5A Livingston4A Stone5A Strafford4B Quay
5A Caldwell5A Macon5A Sullivan6A Sullivan5B Rio Arriba
4A Callaway4A Madison4A TaneyNEW JERSEY4B Roosevelt
4A Camden4A Maries4A Texas5B Sandoval
4A Cape Girardeau5A Marion4A Vernon4A Atlantic5B San Juan
4A Carroll4A McDonald4A Warren5A Bergen5B San Miguel
4A Carter5A Mercer4A Washington4A Burlington5B Santa Fe
4A Cass4A Miller4A Wayne4A Camden4B Sierra
4A Cedar4A Cape May4B Socorro

(continued)

TABLE C301.1—continued
CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID
DESIGNATIONS BY STATE, COUNTY AND TERRITORY

5B Taos4A Queens4A Clay4A Orange7 Divide
5B Torrance5A Rensselaer4A Cleveland3A Pamlico6A Dunn
4B Union4A Richmond3A Columbus*3A Pasquotank7 Eddy
4B Valencia5A Rockland3A Craven3A Pender*6A Emmons
NEW YORK5A Saratoga3A Cumberland3A Perquimans7 Foster
5A Albany5A Schenectady3A Currituck4A Person6A Golden Valley
6A Allegany6A Schoharie3A Dare3A Pitt7 Grand Forks
4A Bronx6A Schuyler3A Davidson4A Polk6A Grant
6A Broome5A Seneca4A Davie3A Randolph7 Griggs
6A Cattaraugus6A Steuben3A Duplin3A Richmond6A Hettinger
5A Cayuga6A St. Lawrence4A Durham3A Robeson7 Kidder
5A Chautauqua4A Suffolk3A Edgecombe4A Rockingham6A LaMoure
5A Chemung6A Sullivan4A Forsyth3A Rowan6A Logan
6A Chenango5A Tioga4A Franklin4A Rutherford7 McHenry
6A Clinton6A Tompkins3A Gaston3A Sampson6A McIntosh
5A Columbia6A Ulster4A Gates3A Scotland6A McKenzie
5A Cortland6A Warren4A Graham3A Stanly7 McLean
6A Delaware5A Washington4A Granville4A Stokes6A Mercer
5A Dutchess5A Wayne3A Greene4A Surry6A Morton
5A Erie4A Westchester4A Guilford4A Swain7 Mountrail
6A Essex6A Wyoming4A Halifax4A Transylvania7 Nelson
6A Franklin5A Yates4A Harnett3A Tyrrell6A Oliver
6A FultonNORTH
CAROLINA
4A Haywood3A Union7 Pembina
5A Genesee4A Henderson4A Vance7 Pierce
5A Greene4A Hertford4A Wake7 Ramsey
6A Hamilton4A Alamance3A Hoke4A Warren6A Ransom
6A Herkimer4A Alexander3A Hyde3A Washington7 Renville
6A Jefferson5A Alleghany4A Iredell5A Watauga6A Richland
4A Kings3A Anson4A Jackson3A Wayne7 Rolette
6A Lewis5A Ashe3A Johnston4A Wilkes6A Sargent
5A Livingston5A Avery3A Jones3A Wilson7 Sheridan
6A Madison3A Beaufort4A Lee4A Yadkin6A Sioux
5A Monroe4A Bertie3A Lenoir5A Yancey6A Slope
6A Montgomery3A Bladen4A LincolnNORTH DAKOTA6A Stark
4A Nassau3A Brunswick*4A Macon7 Steele
4A New York4A Buncombe4A Madison6A Adams7 Stutsman
5A Niagara4A Burke3A Martin7 Barnes7 Towner
6A Oneida3A Cabarrus4A McDowell7 Benson7 Traill
5A Onondaga4A Caldwell3A Mecklenburg6A Billings7 Walsh
5A Ontario3A Camden5A Mitchell7 Bottineau7 Ward
5A Orange3A Carteret*3A Montgomery6A Bowman7 Wells
5A Orleans4A Caswell3A Moore7 Burke7 Williams
5A Oswego4A Catawba4A Nash6A BurleighOHIO
6A Otsego4A Chatham3A New Hanover*7 Cass
5A Putnam4A Cherokee4A Northampton7 Cavalier4A Adams
3A Chowan3A Onslow*6A Dickey5A Allen

(continued)

TABLE C301.1—continued
CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID
DESIGNATIONS BY STATE, COUNTY AND TERRITORY

5A Ashland5A Mahoning3A Bryan3A Okfuskee4C Linn
5A Ashtabula5A Marion3A Caddo3A Oklahoma5B Malheur
5A Athens5A Medina3A Canadian3A Okmulgee4C Marion
5A Auglaize5A Meigs3A Carter3A Osage5B Morrow
5A Belmont5A Mercer3A Cherokee3A Ottawa4C Multnomah
4A Brown5A Miami3A Choctaw3A Pawnee4C Polk
5A Butler5A Monroe4B Cimarron3A Payne5B Sherman
5A Carroll5A Montgomery3A Cleveland3A Pittsburg4C Tillamook
5A Champaign5A Morgan3A Coal3A Pontotoc5B Umatilla
5A Clark5A Morrow3A Comanche3A Pottawatomie5B Union
4A Clermont5A Muskingum3A Cotton3A Pushmataha5B Wallowa
5A Clinton5A Noble3A Craig3A Roger Mills5B Wasco
5A Columbiana5A Ottawa3A Creek3A Rogers4C Washington
5A Coshocton5A Paulding3A Custer3A Seminole5B Wheeler
5A Crawford5A Perry3A Delaware3A Sequoyah4C Yamhill
5A Cuyahoga5A Pickaway3A Dewey3A StephensPENNSYLVANIA
5A Darke4A Pike3A Ellis4B Texas
5A Defiance5A Portage3A Garfield3A Tillman5A Adams
5A Delaware5A Preble3A Garvin3A Tulsa5A Allegheny
5A Erie5A Putnam3A Grady3A Wagoner5A Armstrong
5A Fairfield5A Richland3A Grant3A Washington5A Beaver
5A Fayette5A Ross3A Greer3A Washita5A Bedford
5A Franklin5A Sandusky3A Harmon3A Woods5A Berks
5A Fulton4A Scioto3A Harper3A Woodward5A Blair
4A Gallia5A Seneca3A HaskellOREGON5A Bradford
5A Geauga5A Shelby3A Hughes4A Bucks
5A Greene5A Stark3A Jackson5B Baker5A Butler
5A Guernsey5A Summit3A Jefferson4C Benton5A Cambria
4A Hamilton5A Trumbull3A Johnston4C Clackamas6A Cameron
5A Hancock5A Tuscarawas3A Kay4C Clatsop5A Carbon
5A Hardin5A Union3A Kingfisher4C Columbia5A Centre
5A Harrison5A Van Wert3A Kiowa4C Coos4A Chester
5A Henry5A Vinton3A Latimer5B Crook5A Clarion
5A Highland5A Warren3A Le Flore4C Curry6A Clearfield
5A Hocking4A Washington3A Lincoln5B Deschutes5A Clinton
5A Holmes5A Wayne3A Logan4C Douglas5A Columbia
5A Huron5A Williams3A Love5B Gilliam5A Crawford
5A Jackson5A Wood3A Major5B Grant5A Cumberland
5A Jefferson5A Wyandot3A Marshall5B Harney5A Dauphin
5A KnoxOKLAHOMA3A Mayes5B Hood River4A Delaware
5A Lake3A McClain4C Jackson6A Elk
4A Lawrence3A Adair3A McCurtain5B Jefferson5A Erie
5A Licking3A Alfalfa3A McIntosh4C Josephine5A Fayette
5A Logan3A Atoka3A Murray5B Klamath5A Forest
5A Lorain4B Beaver3A Muskogee5B Lake5A Franklin
5A Lucas3A Beckham3A Noble4C Lane5A Fulton
5A Madison3A Blaine3A Nowata4C Lincoln5A Greene

(continued)

TABLE C301.1—continued
CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID
DESIGNATIONS BY STATE, COUNTY AND TERRITORY

5A Huntingdon3A Bamberg*5A Bennett6A Minnehaha4A Gibson
5A Indiana3A Barnwell*5A Bon Homme6A Moody4A Giles
5A Jefferson3A Beaufort*6A Brookings6A Pennington4A Grainger
5A Juniata3A Berkeley*6A Brown6A Perkins4A Greene
5A Lackawanna3A Calhoun6A Brule6A Potter4A Grundy
5A Lancaster3A Charleston*6A Buffalo6A Roberts4A Hamblen
5A Lawrence3A Cherokee6A Butte6A Sanborn4A Hamilton
5A Lebanon3A Chester6A Campbell6A Shannon4A Hancock
5A Lehigh3A Chesterfield5A Charles Mix6A Spink3A Hardeman
5A Luzerne3A Clarendon6A Clark6A Stanley3A Hardin
5A Lycoming3A Colleton*5A Clay6A Sully4A Hawkins
6A McKean3A Darlington6A Codington5A Todd3A Haywood
5A Mercer3A Dillon6A Corson5A Tripp3A Henderson
5A Mifflin3A Dorchester*6A Custer6A Turner4A Henry
5A Monroe3A Edgefield6A Davison5A Union4A Hickman
4A Montgomery3A Fairfield6A Day6A Walworth4A Houston
5A Montour3A Florence6A Deuel5A Yankton4A Humphreys
5A Northampton3A Georgetown*6A Dewey6A Ziebach4A Jackson
5A Northumberland3A Greenville5A DouglasTENNESSEE4A Jefferson
5A Perry3A Greenwood6A Edmunds4A Johnson
4A Philadelphia3A Hampton*6A Fall River4A Anderson4A Knox
5A Pike3A Horry*6A Faulk4A Bedford3A Lake
6A Potter3A Jasper*6A Grant4A Benton3A Lauderdale
5A Schuylkill3A Kershaw5A Gregory4A Bledsoe4A Lawrence
5A Snyder3A Lancaster6A Haakon4A Blount4A Lewis
5A Somerset3A Laurens6A Hamlin4A Bradley4A Lincoln
5A Sullivan3A Lee6A Hand4A Campbell4A Loudon
6A Susquehanna3A Lexington6A Hanson4A Cannon4A Macon
6A Tioga3A Marion6A Harding4A Carroll3A Madison
5A Union3A Marlboro6A Hughes4A Carter4A Marion
5A Venango3A McCormick5A Hutchinson4A Cheatham4A Marshall
5A Warren3A Newberry6A Hyde3A Chester4A Maury
5A Washington3A Oconee5A Jackson4A Claiborne4A McMinn
6A Wayne3A Orangeburg6A Jerauld4A Clay3A McNairy
5A Westmoreland3A Pickens6A Jones4A Cocke4A Meigs
5A Wyoming3A Richland6A Kingsbury4A Coffee4A Monroe
4A York3A Saluda6A Lake3A Crockett4A Montgomery
RHODE ISLAND3A Spartanburg6A Lawrence4A Cumberland4A Moore
3A Sumter6A Lincoln4A Davidson4A Morgan
5A (all)3A Union6A Lyman4A Decatur4A Obion
SOUTH CAROLINA3A Williamsburg6A Marshall4A DeKalb4A Overton
3A York6A McCook4A Dickson4A Perry
3A AbbevilleSOUTH DAKOTA6A McPherson3A Dyer4A Pickett
3A Aiken6A Meade3A Fayette4A Polk
3A Allendale*6A Aurora5A Mellette4A Fentress4A Putnam
3A Anderson6A Beadle6A Miner4A Franklin4A Rhea

(continued)

TABLE C301.1—continued
CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID
DESIGNATIONS BY STATE, COUNTY AND TERRITORY

4A Roane3B Brewster3B Ector3B Howard3B McCulloch
4A Robertson4B Briscoe2B Edwards*3B Hudspeth2A McLennan*
4A Rutherford2A Brooks*3A Ellis*3A Hunt*2A McMullen*
4A Scott3A Brown*3B El Paso4B Hutchinson2B Medina*
4A Sequatchie2A Burleson*3A Erath*3B Irion3B Menard
4A Sevier3A Burnet*2A Falls*3A Jack3B Midland
3A Shelby2A Caldwell*3A Fannin2A Jackson*2A Milam*
4A Smith2A Calhoun*2A Fayette*2A Jasper*3A Mills*
4A Stewart3B Callahan3B Fisher3B Jeff Davis3B Mitchell
4A Sullivan2A Cameron*4B Floyd2A Jefferson*3A Montague
4A Sumner3A Camp*3B Foard2A Jim Hogg*2A Montgomery*
3A Tipton4B Carson2A Fort Bend*2A Jim Wells*4B Moore
4A Trousdale3A Cass*3A Franklin*3A Johnson*3A Morris*
4A Unicoi4B Castro2A Freestone*3B Jones3B Motley
4A Union2A Chambers*2B Frio*2A Karnes*3A Nacogdoches*
4A Van Buren2A Cherokee*3B Gaines3A Kaufman*3A Navarro*
4A Warren3B Childress2A Galveston*3A Kendall*2A Newton*
4A Washington3A Clay3B Garza2A Kenedy*3B Nolan
4A Wayne4B Cochran3A Gillespie*3B Kent2A Nueces*
4A Weakley3B Coke3B Glasscock3B Kerr4B Ochiltree
4A White3B Coleman2A Goliad*3B Kimble4B Oldham
4A Williamson3A Collin*2A Gonzales*3B King2A Orange*
4A Wilson3B Collingsworth4B Gray2B Kinney*3A Palo Pinto*
TEXAS2A Colorado*3A Grayson2A Kleberg*3A Panola*
2A Comal*3A Gregg*3B Knox3A Parker*
2A Anderson*3A Comanche*2A Grimes*3A Lamar*4B Parmer
3B Andrews3B Concho2A Guadalupe*4B Lamb3B Pecos
2A Angelina*3A Cooke4B Hale3A Lampasas*2A Polk*
2A Aransas*2A Coryell*3B Hall2B La Salle*4B Potter
3A Archer3B Cottle3A Hamilton*2A Lavaca*3B Presidio
4B Armstrong3B Crane4B Hansford2A Lee*3A Rains*
2A Atascosa*3B Crockett3B Hardeman2A Leon*4B Randall
2A Austin*3B Crosby2A Hardin*2A Liberty*3B Reagan
4B Bailey3B Culberson2A Harris*2A Limestone*2B Real*
2B Bandera*4B Dallam3A Harrison*4B Lipscomb3A Red River*
2A Bastrop*3A Dallas*4B Hartley2A Live Oak*3B Reeves
3B Baylor3B Dawson3B Haskell3A Llano*2A Refugio*
2A Bee*4B Deaf Smith2A Hays*3B Loving4B Roberts
2A Bell*3A Delta3B Hemphill3B Lubbock2A Robertson*
2A Bexar*3A Denton*3A Henderson*3B Lynn3A Rockwall*
3A Blanco*2A DeWitt*2A Hidalgo*2A Madison*3B Runnels
3B Borden3B Dickens2A Hill*3A Marion*3A Rusk*
2A Bosque*2B Dimmit*4B Hockley3B Martin3A Sabine*
3A Bowie*4B Donley3A Hood*3B Mason3A San Augustine*
2A Brazoria*2A Duval*3A Hopkins*2A Matagorda*2A San Jacinto*
2A Brazos*3A Eastland2A Houston*2B Maverick*2A San Patricio*

(continued)

TABLE C301.1—continued
CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID
DESIGNATIONS BY STATE, COUNTY AND TERRITORY

3A San Saba*3A Young4C Clark4A GilmerWISCONSIN
3B Schleicher2B Zapata*5B Columbia5A Grant
3B Scurry2B Zavala*4C Cowlitz5A Greenbrier6A Adams
3B ShackelfordUTAH5B Douglas5A Hampshire7 Ashland
3A Shelby*5B Beaver6B Ferry5A Hancock6A Barron
4B Sherman6B Box Elder5B Franklin5A Hardy7 Bayfield
3A Smith*6B Cache5B Garfield5A Harrison6A Brown
3A Somervell*6B Carbon5B Grant4A Jackson6A Buffalo
2A Starr*6B Daggett4C Grays Harbor4A Jefferson7 Burnett
3A Stephens5B Davis4C Island4A Kanawha6A Calumet
3B Sterling6B Duchesne4C Jefferson5A Lewis6A Chippewa
3B Stonewall5B Emery4C King4A Lincoln6A Clark
3B Sutton5B Garfield4C Kitsap4A Logan6A Columbia
4B Swisher5B Grand5B Kittitas5A Marion6A Crawford
3A Tarrant*5B Iron5B Klickitat5A Marshall6A Dane
3B Taylor5B Juab4C Lewis4A Mason6A Dodge
3B Terrell5B Kane5B Lincoln4A McDowell6A Door
3B Terry5B Millard4C Mason4A Mercer7 Douglas
3B Throckmorton6B Morgan6B Okanogan5A Mineral6A Dunn
3A Titus*5B Piute4C Pacific4A Mingo6A Eau Claire
3B Tom Green6B Rich6B Pend Oreille5A Monongalia7 Florence
2A Travis*5B Salt Lake4C Pierce4A Monroe6A Fond du Lac
2A Trinity*5B San Juan4C San Juan4A Morgan7 Forest
2A Tyler*5B Sanpete4C Skagit5A Nicholas6A Grant
3A Upshur*5B Sevier5B Skamania5A Ohio6A Green
3B Upton6B Summit4C Snohomish5A Pendleton6A Green Lake
2B Uvalde*5B Tooele5B Spokane4A Pleasants6A Iowa
2B Val Verde*6B Uintah6B Stevens5A Pocahontas7 Iron
3A Van Zandt*5B Utah4C Thurston5A Preston6A Jackson
2A Victoria*6B Wasatch4C Wahkiakum4A Putnam6A Jefferson
2A Walker*3B Washington5B Walla Walla5A Raleigh6A Juneau
2A Waller*5B Wayne4C Whatcom5A Randolph6A Kenosha
3B Ward5B Weber5B Whitman4A Ritchie6A Kewaunee
2A Washington*VERMONT5B Yakima4A Roane6A La Crosse
2B Webb*WEST VIRGINIA5A Summers6A Lafayette
2A Wharton*6A (all)5A Taylor7 Langlade
3B WheelerVIRGINIA5A Barbour5A Tucker7 Lincoln
3A Wichita4A Berkeley4A Tyler6A Manitowoc
3B Wilbarger4A (all)4A Boone5A Upshur6A Marathon
2A Willacy*WASHINGTON4A Braxton4A Wayne6A Marinette
2A Williamson*5A Brooke5A Webster6A Marquette
2A Wilson*5B Adams4A Cabell5A Wetzel6A Menominee
3B Winkler5B Asotin4A Calhoun4A Wirt6A Milwaukee
3A Wise5B Benton4A Clay4A Wood6A Monroe
3A Wood*5B Chelan5A Doddridge4A Wyoming6A Oconto
4B Yoakum4C Clallam5A Fayette7 Oneida
6A Outagamie

(continued)

TABLE C301.1—continued
CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID
DESIGNATIONS BY STATE, COUNTY AND TERRITORY

6A Ozaukee7 Taylor6B Big Horn6B SheridanNORTHERN MARIANA ISLANDS
6A Pepin6A Trempealeau6B Campbell7 Sublette
6A Pierce6A Vernon6B Carbon6B Sweetwater
6A Polk7 Vilas6B Converse7 Teton1A (all)*
6A Portage6A Walworth6B Crook6B UintaPUERTO RICO
7 Price7 Washburn6B Fremont6B Washakie
6A Racine6A Washington5B Goshen6B Weston1A (all)*
6A Richland6A Waukesha6B Hot SpringsUS TERRITORIESVIRGIN ISLANDS
6A Rock6A Waupaca6B Johnson
6A Rusk6A Waushara6B LaramieAMERICAN SAMOA1A (all)*
6A Sauk6A Winnebago7 Lincoln
7 Sawyer6A Wood6B Natrona1A (all)*
6A ShawanoWYOMING6B NiobraraGUAM
6A Sheboygan6B Park
6A St. Croix6B Albany5B Platte1A (all)*
Warm humid counties are identified in Table C301.1 by an asterisk.
The climate zone for any location outside the United States shall be determined by applying Table C301.3(1) and then Table C301.3(2).

TABLE C301.3(1) INTERNATIONAL CLIMATE ZONE DEFINITIONS

MAJOR CLIMATE TYPE DEFINITIONS
Marine (C) Definition—Locations meeting all four criteria:
1. Mean temperature of coldest month between -3°C (27°F) and 18°C (65°F).
2. Warmest month mean < 22°C (72°F).
3. At least four months with mean temperatures over 10°C (50°F).
4. Dry season in summer. The month with the heaviest precipitation in the cold season has at least three times as much precipitation as the month with the least precipitation in the rest of the year. The cold season is October through March in the Northern Hemisphere and April through September in the Southern Hemisphere.
Dry (B) Definition—Locations meeting the following criteria:
Not marine and Pin < 0.44 × (TF - 19.5) [Pcm < 2.0 × (TC + 7) in SI units]
where:
Pin = Annual precipitation in inches (cm)
T = Annual mean temperature in °F (°C)
Moist (A) Definition—Locations that are not marine and not dry.
Warm-humid Definition—Moist (A) locations where either of the following wet-bulb temperature conditions shall occur during the warmest six consecutive months of the year:
1. 67°F (19.4°C) or higher for 3,000 or more hours; or
2. 73°F (22.8°C) or higher for 1,500 or more hours.
For SI: °C = [(°F)-32]/1.8, 1 inch = 2.54 cm.

TABLE C301.3(2) INTERNATIONAL CLIMATE ZONE DEFINITIONS

ZONE
NUMBER
THERMAL CRITERIA
IP UnitsSI Units
19000 < CDD50°F5000 < CDD10°C
26300 < CDD50°F ? 90003500 < CDD10°C ? 5000
3A and 3B4500 < CDD50°F ? 6300 AND HDD65°F ? 54002500 < CDD10°C ? 3500 AND HDD18°C ? 3000
4A and 4BCDD50°F ? 4500 AND HDD65°F ? 5400CDD10°C ? 2500 AND HDD18°C ? 3000
3CHDD65°F ? 3600HDD18°C ? 2000
4C3600 < HDD65°F ? 54002000 < HDD18°C ? 3000
55400 < HDD65°F ? 72003000 < HDD18°C ? 4000
67200 < HDD65°F ? 90004000 < HDD18°C ? 5000
79000 < HDD65°F ? 126005000 < HDD18°C ? 7000
812600 < HDD65°F7000 < HDD18°C
For SI: °C = [(°F)-32]/1.8.
The interior design temperatures used for heating and cooling load calculations shall be a maximum of 72°F (22°C) for heating and minimum of 75°F (24°C) for cooling.
Materials, systems, and equipment shall be identified in a manner that will allow a determination of compliance with the applicable provisions of this code. Materials shall be designed for the intended use and installed in accordance with the manufacturer’s installation instructions, any listing, or certifications required. Subsections C303.1.1, C303.1.1.1, C303.1.2, C303.1.3, C303.1.4, and Tables C303.1.3(1), C303.1.3(2), and C303.1.3(3) are maintained without amendment.
An R-value identification mark shall be applied by the manufacturer to each piece of building thermal envelope insulation 12 inches (305 mm) or greater in width. Alternately, the insulation installers shall provide a certification listing the type, manufacturer and R-value of insulation installed in each element of the building thermal envelope. For blown or sprayed insulation (fiberglass and cellulose), the initial installed thickness, settled thickness, settled R-value, installed density, coverage area and number of bags installed shall be listed on the certification. For sprayed polyurethane foam (SPF) insulation, the installed thickness of the areas covered and R-value of installed thickness shall be listed on the certification. The insulation installer shall sign, date and post the certification in a conspicuous location on the job site.
The thickness of blown-in or sprayed roof/ceiling insulation (fiberglass or cellulose) shall be written in inches (mm) on markers that are installed at least one for every 300 square feet (28 m2) throughout the attic space. The markers shall be affixed to the trusses or joists and marked with the minimum initial installed thickness with numbers a minimum of 1 inch (25 mm) in height. Each marker shall face the attic access opening. Spray polyurethane foam thickness and installed R-value shall be listed on certification provided by the insulation installer.
Insulating materials shall be installed such that the manufacturer’s R-value mark is readily observable upon inspection.
U-factors of fenestration products (windows, doors and skylights) shall be determined in accordance with NFRC 100 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled U-factor shall be assigned a default U-factor from Table C303.1.3(1) or C303.1.3(2). The solar heat gain coefficient (SHGC) and visible transmittance (VT) of glazed fenestration products (windows, glazed doors and skylights) shall be determined in accordance with NFRC 200 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled SHGC or VT shall be assigned a default SHGC or VT from Table C303.1.3(3).

TABLE C303.1.3(1) DEFAULT GLAZED FENESTRATION U-FACTOR

FRAME TYPESINGLE
PANE
DOUBLE
PANE
SKYLIGHT
SingleDouble
Metal1.200.802.001.30
Metal with Thermal Break1.100.651.901.10
Nonmetal or Metal Clad0.950.551.751.05
Glazed Block0.60

TABLE C303.1.3(2) DEFAULT DOOR U-FACTORS

DOOR TYPEU-FACTOR
Uninsulated Metal1.20
Insulated Metal0.60
Wood0.50
Insulated, nonmetal edge, max 45% glazing, any glazing double pane0.35

TABLE C303.1.3(3) DEFAULT GLAZED FENESTRATION SHGC AND VT

SINGLE GLAZEDDOUBLE GLAZEDGLAZED
BLOCK
Clear TintedClear Tinted
SHGC0.80.70.70.60.6
VT0.60.30.60.30.6
The thermal resistance (R-value) of insulation shall be determined in accordance with the U.S. Federal Trade Commission R-value rule (CFR Title 16, Part 460) in units of h × ft2 × °F/Btu at a mean temperature of 75°F (24°C).
All materials, systems and equipment shall be installed in accordance with the manufacturer’s installation instructions and the International Building Code.
Insulation applied to the exterior of basement walls, crawlspace walls and the perimeter of slab-on-grade floors shall have a rigid, opaque and weather-resistant protective covering to prevent the degradation of the insulation’s thermal performance. The protective covering shall cover the exposed exterior insulation and extend a minimum of 6 inches (153 mm) below grade.
Maintenance instructions shall be furnished for equipment and systems that require preventive maintenance. Required regular maintenance actions shall be clearly stated and incorporated on a readily accessible label. The label shall include the title or publication number for the operation and maintenance manual for that particular model and type of product.
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