Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A measure of the capacity of a material, such as insulation, to impede heat flow, with increasing values indicating a greater capacity.
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
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Examples
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Install insulation with an R-value of at least 30 in your attic but install R-38 if affordable.
Alanna Zabel: I Am Green Alanna Zabel 2011
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That claim violated the FTC's R-value Rule and the FTC Act. The FTC complaint also alleged that Working Chemical Solutions and Smith were in violation of the R-value Rule because they lacked test results to back up their insulation claim.
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Indeed, most fiberglass and cellulose insulation has an R-value per inch of 3 to 5.
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Indeed, most fiberglass and cellulose insulation has an R-value per inch of 3 to 5.
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And the price of insulation typically rises as the R-value increases, so you want to be sure that you're getting the R-value you're paying for.
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According to the FTC complaint, Working Chemical Solutions claimed that PolyCell Chemical Additive could double the R-value of insulation to at least R-7. 1 per inch and up to R-8 per inch.
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(Standard cellulose insulation has an R-value of approximately R-4 per inch, says the FTC.)
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This means that a vacuum-insulated panel offers far greater thermal resistance (R-value) than conventional insulation.
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The effectiveness of home insulation grows as the material's R-value — its resistance to heat flow — climbs.
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The R-value per inch of a vacuum-insulated panel is at least 20 and can climb as high 100, according to U.S. Department of Energy data.
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