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    CalculatorsHome ImprovementAttic & Blown-In Insulation Calculator

    Attic & Blown-In Insulation Calculator

    Calculate cellulose & fiberglass blown-in bags, initial vs settled depths, DOE climate R-values, rafter baffles, and energy payback.

    Calculate
    Attic & Blown-In Insulation Calculator
    Calculate bags of blown-in cellulose or expanding fiberglass, initial overblow and settled depths, soffit rafter baffles, air sealing foam cans, and annual heating/cooling energy payback.
    1. Attic Dimensions & Target R-Value
    Enter attic floor dimensions, your climate zone target R-value, and existing insulation depth.

    Target R-49. Balanced heating and cooling seasons with freezing winter days.

    DOE Standard: R-38 (South), R-49 (Mid-US), R-60 (North)

    0" for empty attic; ~4" = R-13, ~6" = R-19, ~8" = R-25.

    Dense, excellent sound dampening & pest resistance. Requires ~18% overblow for settling.

    2. Air Sealing, Soffit Vents & Cost Modeling
    Configure ventilation baffles, expanding foam air sealing, and utility bill savings.

    Expanding spray foam cans for gaps

    Prevents insulation from clogging eave airflow

    Avg $15 - $20 / bag

    Foam proper-vent

    Great Stuff / FireBlock

    For payback period

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