How Thick Is R30 Insulation?
Last Updated Mar 26, 2020 11:00:05 AM ET
Insulation thickness to reach the R-30 value depends on the insulation material, but fiberglass batts of R-30 insulation are 9 1/2 inches thick. Rigid foam insulation provides the same R-factor with approximately one-half the thickness.
Blown-in insulation conforms to irregular spaces and fills areas around pipes easily, but blown-in fiberglass insulation should be 12.3 inches thick. Blown-in cellulose requires 8.4 inches to provide the same amount of insulation.
In walls, the available space limits the amount of protection insulation provides. Standard 4-inch walls limit insulation to R-13 or R-15 batts, while 6-inch walls allow for installation of R-19 or R-21 products.
More From Reference
A Brief History of Insults: How Different Cultures Use Spoken and Written Verse to Mock and Mediate
Fact Check: How Accurate Are Farmers Almanac Weather Forecasts in Comparison to Weather Apps?
What Annual Income Is Considered Poverty Level & How Was the Federal Poverty Level Established?
Tokyo 2020: Here's How the First Modern Olympics Started 125 Years Ago
Why Do So Many Countries Celebrate Labour Day in May?
Tokyo 2020 Is Now Tokyo 2021: How Will the Postponed Olympic Games Unfold in Japan This July?