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TeachMeFinance.com - explain R-value R-value The term 'R-value' as it applies to the area of energy can be defined as ' A measure of a material's resistance to heat flow in units of Fahrenheit degrees x hours x square feet per Btu.The higher the R-value of a material, the greater its insulating capability. The R-value of some insulating materials is 3.7 per inch for fiber glass and cellulose,2.5 per inch for vermiculite, and more than 4per inch for foam. All building materials have some R-value. For example, a 4-inch brick has an R-value of 0.8, and half-inch plywood hasan R-value of 0.6. The table below converts the most common 'R' values to inches. For other 'R' values, divide the 'R' value by 3 to get the number of inches'. Previous 5 Terms: RUSLE russet Russophobia rutherford RVA Next 5 Terms: RVF RVI RVR RVS RW About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.