Yavapai County's wildland-urban interface (WUI) map was last updated
November 2025. Class A roof rating + ember-resistant detailing are
now required for:
- All new construction in WUI zones
- Any re-roof exceeding 25% of the existing area in WUI zones
- Any addition or major remodel in WUI zones
Currently-classified WUI ZIP codes (Yavapai)
| ZIP | Area | Class A required? |
|-------|--------------------|--|
| 86301 | Prescott central | Partial (forest-interface lots) |
| 86303 | Prescott (Hassayampa, Granite Dells) | Yes |
| 86305 | Prescott (north) | Yes |
| 86314 | Prescott Valley | Partial |
| 86323 | Chino Valley | No |
| 86326 | Cottonwood | Partial |
| 86327 | Dewey-Humboldt | Yes (added 2025) |
| 86329 | Humboldt | Yes (added 2025) |
| 86333 | Mayer | Yes (added 2025) |
| 86334 | Paulden | No (open prairie) |
| 86322 | Camp Verde | Partial |
What "Class A" actually means
Class A is the highest fire rating per ASTM E108. It means the roof
assembly will resist:
- Severe fire exposure for 90+ minutes
- 12 lb burning brand impact
- Spread of flame at 6+ feet/min wind speed
Class A is achieved by:
- Architectural asphalt shingles with Class A rating (most
modern brands)
- Concrete or clay tile (inherently Class A)
- Standing-seam metal with Class A underlayment
- NOT wood shake (Class C even with treatment)
- NOT older 3-tab shingles without Class A spec
Ember-resistant detailing (the part most contractors miss)
Class A rating on the field shingles isn't enough. WUI code also
requires:
- Ember-resistant vents — use 1/8" mesh screens, not 1/4". Most
older roofs have 1/4" vents that pass embers through.
- Closed-eave construction — open-rafter eaves are an ember
trap. Soffit must be sealed.
- Fire-resistant gutters — non-combustible (metal, not vinyl).
Gutter guards required to keep needles out.
- Roof-edge ember stops — at every roof penetration + the rake
edge.
Cost adder
A Class A re-roof with full ember-resistant detailing runs ~$1,500-
$3,000 more than a basic asphalt re-roof on a 2,200 sq ft home.
Insurance discount typically: 5-15% on the wildfire-exposure
portion of your homeowners' premium.
What if your roof is non-conforming?
You're not required to retrofit unless you trigger a major-repair
threshold. But if you're in a newly-WUI'd ZIP (Dewey-Humboldt,
Humboldt, Mayer), plan for the upgrade at next re-roof.