IECC Climate Zone 6 — Cold

Updated Mar 26, 2026

Cold northern climate covering northern states, Great Lakes, and northern New England. Heating-dominated with high insulation requirements. Air sealing critical — max 3 ACH50 per IECC.

TAGS

IECC cold northern heating air-sealing

DETAILS

hdd range

7,000-8,000

iecc zone

air tightness

3 ACH50 max

example cities

Minneapolis, Burlington VT, Duluth, Bangor ME

roof insulation

R-49 to R-60

wall insulation

R-20+R-5ci or R-13+R-10ci

RELATED KNOWLEDGE

📋 Code

IBC Section 1107 — Accessible Unit and Dwelling Unit Elements

Requires accessible common use elements within individual residential units.

📋 Code

IECC Section 603 — Energy Cost Budget Method

Provides performance-based alternative to prescriptive energy code requirements.

🌡️ Climate Zone

IECC Climate Zone 4A — Mixed-Humid (New York City, Philadelphia, Washington DC)

Mixed-humid climate with hot summers and cold winters. Heating degree days 3500-5500. Requires balanced envelope strategy: good insulation + solar heat gain management. Seismic Design Category B-C.

🌡️ Climate Zone

IECC Climate Zone 3B — Warm-Dry (Los Angeles, Las Vegas, Phoenix)

Warm-dry climate with mild winters and hot dry summers. Minimal heating needs. Primary concern is cooling load and solar heat gain. Seismic Design Category D-E in California. Wildfire risk zones.

📋 Code

NFPA 99 — Health Care Facilities Code

Comprehensive code for safety systems in hospitals and medical facilities.

🌿 certification

Fire Protection Engineer (FPE) Certification

Advanced certification for engineers specializing in fire safety systems.

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