Hawaii Administrative Rules
Title 3 - DEPARTMENT OF ACCOUNTING AND GENERAL SERVICES
Building Code Council
State Energy Conservation Code
Subchapter 2 - AMENDMENTS TO THE 2018 ICC INTERNATIONAL ENERGY CONSERVATION CODE
9 - Above-grade walls
Current through January, 2025
IECC Section C402.2.2 is amended to read as follows:
C402.2.2 Above Grade Walls. The minimum thermal resistance (R-value) of materials installed in the wall cavity between framing members and continuously on the walls shall be as specified in Table C402.1.3, based on framing type and construction materials used in the wall assembly.
Exceptions:
Continuous insulation for above grade walls and mass walls are not required when one of the following conditions are met:
1. Walls have a covering with a reflectance of = 0.64; or
2. Walls have overhangs with a projection factor equal to or greater than 0.3. The projection factor is the horizontal distance from the surface of the wall to the farthest most point of the overhang divided by the vertical distance from the first-floor level to the bottom most point of the overhang.
3. Concrete, CMU and similar mass walls are 6 inches or greater in thickness.