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how do you measure r-factor in an attic

the builder of my house says i have r-38 insulation in my attic. i have measured and blown-in insulation is 17" thick (deep). what does that mean to me?

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it means you builder wasn't lying. r value of insulation is between 1.7 and 3.5 per inch for blown in insulation. the most common types are between 2 and 2.5 for the inexpensive insulation.

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