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R-value

 
Dictionary: R-val·ue   (är'văl')
n.
A measure of the capacity of a material, such as insulation, to impede heat flow, with increasing values indicating a greater capacity.

[r(esistance) value.]


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A measure of the heat conductivity of material. The higher the R value, the better the material serves as insulation from heat transfer. R value generally applies to insulating materials, roofs, exterior walls, and windows and doors.
Example: The walls in a building have an estimated R value of 20. Fiberglass insulation with an R value of 34 was installed in the walls to make the building more energy efficient.

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A measure of the thermal resistance of a material or component.


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R-value can refer to:

  • r-value, in computer science, a value that does not have an address in a computer language

 
 
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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
Real Estate Dictionary. Dictionary of Real Estate Terms. Copyright © 2004 by Barron's Educational Series, Inc. All rights reserved.  Read more
Architecture. McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved.  Read more
Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "R-value" Read more