Insulation R-values required in IECC climate zone 8 — attic, walls, and floor

What the 2021 IECC requires in climate zone 8: insulation for the attic, walls, and floor. A thicker layer means a higher R-value.

A house cross-section showing the 2021 IECC minimum insulation R-values for climate zone 8 (subarctic): the required R-value for the attic or ceiling, the exterior walls, and the floor, with each layer drawn thicker where a higher R-value is required. Climate zone 8 covers interior Alaska. Values are from IECC Table R402.1.3. — Source: 2021 IECC Table R402.1.3

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A house cross-section showing the 2021 IECC minimum insulation R-values for climate zone 8 (subarctic): the required R-value for the attic or ceiling, the exterior walls, and the floor, with each layer drawn thicker where a higher R-value is required. Climate zone 8 covers interior Alaska. Values are from IECC Table R402.1.3.

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