Applicable Building Type(s)

New residential

Policy Requirement Level

Mandatory

Policy Sequence

Governance

Development Authority: International Code Commission and Architectural Energy Corporation of Hawaii

Implementation Authority: Municipal or county governments

Verification Authority: Code officials

Prescriptive Compliance path

The horizontal projection of that portion of interior space which is contained within exterior walls and which is conditioned directly or indirectly by an energy-using system

Energy Requirements:

Insulation

U-Values (Btu/h.ft2)FloorRoofWallsWindows
Climate zone 1 0.064 0.035 0.197 1.2
Climate zone 2 0.064 0.035 0.165 0.75
Climate zone 3A and 3B 0.047 0.035 0.141 0.65
Climate zone 4A and 4B 0.047 0.03 0.141 0.35
Climate zone 4C 0.033 0.03 0.082 0.35
Climate zone 5 0.033 0.03 0.082 0.35
Climate zone 6 0.033 0.026 0.06 0.35
Climate zone 7 0.033 0.026 0.057 0.35
Climate zone 8 0.028 0.026 0.057 0.35

Windows

SHGC is 0.40 W/m2.k for zones 1 - 3 Up to 1.4m2 of glazed fenestration per dwelling unit shall be permitted to be exempt from U-factor and SHGC requirements

Skylights

Skylights individually are 0.75 W/m2.k zones 1-2, 0.65 W/m2.k zone 3 and 0.60 W/m2.k zones 4-8

Air Leakage

0.3 cubic feet per minute (CFM) per square foot of door area for sliding doors 0.5 cubic feet per minute (CFM) per square foot of door area for swinging doors. For residences without mechanical ventilation > 0.35 ACH (model based approach only) For residences with mechanical ventilation measured air exchange rate combined with the mechanical ventilation rate > 0.01 × conditioned floor area + 7.5 × (Nbedrooms+1)

Space Heating System

At least one thermostat shall be provided for each separate heating and cooling system. Specific requirements exist for ducts, piping, ventilation, pool systems and snow melt systems Requirements are relative to equipment size and building type.

Water Heating System

All circulating service hot water piping shall be insulated to at least R-2 and have automatic or accessible manual switches to turn off the pump when the system is not in use

Compliance Softwares:

End-uses considered:

Space heating, Space cooling, Water heating, Ventilation

Performance Compliance path

Not a requirement / performance based elements are based on a reference model and are relative to energy costs

Energy Requirements:

Resources

Notes

Climate zones