Utah Building Climate Zone
Utah is mostly cold dry Zone 5 with colder mountain areas. State-level climate-zone pages are planning baselines; IECC climate zones are county based.
Planning baseline
- IECC climate zone: Zone 5B
- Climate type: Cold
- Wall planning target: R-20 + R-5 continuous insulation or R-13 + R-10 continuous insulation
- Attic planning target: R-60
- Floor planning target: R-30