International Energy Conservation Code
Section 402.1.1 Insulation and fenestration criteria
The building thermal envelope will meet the requirements of Table 402.1.1 based on the climate zone specified in Chapter 3 of the IECC.
This code implies that there are prescribed thermal R-values for residential ceilings. The R-value is based on the climate zones identified within the International Energy Conservation Code.
Climate Zone Ceiling R-Value
- 1 30
- 2 30
- 3 30
- 4 38
- 5 38
- 6 49
- 7 49
- 8 49
Note: 402.1.2 R-value computation indicates that R-value shall be based solely on insulating material and shall not include other building materials or air films.