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What is R-value and how much R-value should I have in the attic?

April 26, 2017attic R-Value

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What is R-value and how much R-value should I have in the attic?

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R-value is the resistance of air to flow through the insulation. The greater the R-value, the greater insulating value. Code requires at least R30. Good cents standard recommends R38. The Department of Energy recommends a R49 for the Gulf Coast.