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How do you work out the R-value of loose cellulose?

captainsolar | Posted in Energy Efficiency and Durability on

Have roof filled with Insulation and need to work out it’s R rating

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  1. GBA Editor
    Martin Holladay | | #1

    Cellulose has an R-value of about R-3.7 per inch.

    I don't know if your cellulose is on your attic floor or between your sloped rafters -- but if the insulation is between your sloped rafters, I hope that you have a ventilation gap between the top of the insulation and the roof sheathing.

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