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READ THESE ARTICLES# Definition of *R-value* in English:

## R-value

### noun

The capacity of an insulating material to resist heat flow. The higher the R-value, the greater the insulating power.

*‘So, where R-values rate how much heat loss the material resists from passing through it, U-values rate how much heat the component allows to pass through it.’**‘Manufacturers usually represent the energy efficiency of windows in terms of their U-values (conductance of heat) or their R-values (resistance to heat flow).’**‘Don't forget that R-values are determined by material type, thickness, and installed weight per square foot, not by thickness alone.’**‘Discuss the house plans with your builder, and make sure each of these spaces is insulated to the recommended R-values.’**‘Thermal characteristics mean the R-value of the material.’**‘Also note that the R-value only refers to heat transfer per unit time and does not take into account the flywheel effect of concrete's thermal mass.’**‘The R-value is the inverse of the U-value, so the higher the R-value, the more the window resists heat flow.’**‘Both products offer similar R-values to other fibrous insulation types (about R - 3.5 per inch of thickness.)’**‘It's more efficient to use insulation with higher R-values in the attic and in rooms with cathedral ceilings than in wood frame walls and basements or crawl spaces with walls.’**‘The next step is to compare the R-value of your insulation with the recommended R-values for your house and your type of space heating.’**‘You should consider the several forms of insulation available, their R-values, and the thickness needed.’**‘Water dampens and compresses wall and attic insulation, lowering R-values and increasing heating costs.’**‘For walls, this may mean looking at ways to reduce thermal bridging or increase insulation R-values.’**‘Insulation loses its R-value as it takes on moisture.’**‘This is done by taking the R-value you would like to achieve and dividing it by the R-value per inch of the insulation material you'd like to use.’**‘The cavity created by the added framing should be thick enough for the desired insulation R-value.’**‘For the best energy efficiency, select the proper R-value for your region, and insulate ceilings, walls and floors well.’**‘Check with your State Energy Commission, local power company, or local home center for the optimum R-value in your region.’**‘Thicker insulation does not necessarily mean higher R-value.’**‘When it comes to energy efficiency and insulation, the key issue is R-value cost per square foot.’*

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