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ENERGY STAR says the minimum attic insulation in the northern U.S. is about what?

R-49, about 16 to 18 inches.

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  1. R-49 (about 16 to 18 inches) ✔
  2. R-19 (about 6 inches)
  3. R-11 (about 3 inches)

Why: In the Southern U.S. the minimum is R-38, about 13 to 14 inches. In the Northern U.S. it is R-49, about 16 to 18 inches. Subtract what you have from the target to see how much to add.

Huh, didn't know that: If your attic insulation is level with or below the floor joists, you probably need more.

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References

Answer: R-49 (about 16 to 18 inches). In the Southern U.S. the minimum is R-38, about 13 to 14 inches. In the Northern U.S. it is R-49, about 16 to 18 inches. Subtract what you have from the target to see how much to add.

  1. ENERGY STAR: Check your attic insulation www.energystar.gov/products/ask-the-experts/how-to-check-your-homes-attic-insulation-level
    If you live in the Northern part of the U.S., the recommended insulation level is a minimum of R-49 or about 16-18 inches of insulation.
    Checked 2026-10-10.

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