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Insulation depth and volume
How many inches of insulation to add to reach a target R-value.
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How this works
Depth = (target R − existing R) ÷ R-value per inch of the material. Volume = attic area × depth.
Related guide
Insulation & weatherization guide
Improve comfort and energy performance by choosing climate-appropriate insulation, air sealing, and moisture control for the whole home.