Mesa vs Phoenix
How do cool roof requirements rules compare between Mesa, AZ and Phoenix, AZ?
Mesa and Phoenix have similar restriction levels.
Mesa, AZ
Maricopa County
Mesa enforces the Arizona-adopted International Energy Conservation Code, which encourages reflective roofing in low-slope commercial construction. Climate zone 2B applies, prioritizing summer cooling load reduction over winter heat retention.
View full Mesa rules →Phoenix, AZ
Maricopa County
Phoenix Building Construction Code Chapter 11 (energy provisions) and amendments to the 2018 IECC require new low-slope roofs to meet cool-roof reflectance and emittance thresholds. Phoenix participates in the Cool Roof Coalition with ASU and EPA SmartGrowth.
View full Phoenix rules →Key Facts Comparison
| Fact | Mesa | Phoenix |
|---|---|---|
| Code basis | IECC Climate Zone 2B | - |
| Reflectance | 0.65 initial typical | - |
| Scope | Commercial low-slope new | - |
| Rebate partner | SRP, Mesa Utilities | - |
| Code citation | - | Phoenix Ch. 11 IECC amendments |
| Low-slope reflectance | - | Aged 0.55 minimum |
| Low-slope emittance | - | 0.75 minimum |
| Verifying body | - | Cool Roof Rating Council |
| Permitting agency | - | Phoenix Planning and Development |
Highlighted rows indicate differences between cities.
Mesa FAQ
Do I need a white roof on my house?
No. Residential roofs are not required to be reflective. Cool roof rules apply to new commercial low-slope construction; homeowners may qualify for utility rebates voluntarily.
What climate zone is Mesa?
Mesa is IECC climate zone 2B (hot-dry), which prioritizes cooling load reduction. This drives the higher reflectance thresholds compared to colder northern Arizona.
Phoenix FAQ
Does the cool-roof rule apply to my house?
Generally only to low-slope sections of new construction or major reroofs. Steep-slope shingled residential roofs are not required to meet cool-roof reflectance under Phoenix amendments to the 2018 IECC, though products are encouraged.
What products qualify?
Roofing materials labeled by the Cool Roof Rating Council with three-year aged solar reflectance of 0.55 or higher and thermal emittance of 0.75 or higher meet the Phoenix low-slope standard for plan-check approval.
Is there a rebate?
APS and SRP offer commercial cool-roof rebates through their energy-efficiency programs. Phoenix's Office of Sustainability publicizes seasonal incentive partnerships, especially through the Cool Roof Coalition with ASU and EPA.
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