Climate Zone 2

Climate Zone 2 Attic Insulation

Zone 2 still skews cooling-dominant, but homes also need enough attic depth to control shoulder-season heat flow.

Retrofit Target
R-38
New Build Target
R-49
Heating Days
1200
Cooling Days
3000

What Homeowners in Zone 2 Should Watch For

In Climate Zone 2, the main attic risk is summer heat load. Reduce attic radiant gain while keeping installation cost efficient.

Recommended Attic Upgrade Strategy

Most homeowners in this zone should treat attic upgrades as a combination of air sealing, insulation depth, and consistent coverage. Hitting the nominal R-value target is not enough if bypasses, hatch leaks, or wind washing are still present.

Good Material Fits for Zone 2

  • blown-in fiberglass
  • blown-in cellulose
  • spray foam for difficult roofline details

Attic Checklist Before You Buy More Insulation

  • Verify current depth before adding more loose-fill
  • Air-seal wiring and duct chases first
  • Check whether ducts in the attic need separate insulation attention

Recommended for Zone 2

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