R-value


Also found in: Dictionary, Legal, Financial, Acronyms, Wikipedia.

R-value

[′är ‚val·yü]
(engineering)
An index of the ability of a substance or material to retard the flow of heat; higher numerical values correspond to higher insulating ability.

R-value

A unit of thermal resistance. A material’s R-value is a measure of the effectiveness of the material in stopping the flow of heat through it. The higher a material’s Rvalue, the greater its insulating properties and the slower the heat flow through it. Examples of higher R-values for residential buildings: R-50 ceilings, R-21 walls, and R-30 floors.

R-value

A measure of the thermal resistance of a material or component.
References in periodicals archive ?
The first version of the current R-value Rule was adopted, according to FTC, in response to a variety of unfair or deceptive actions by the insulation industry.
For example, a 1-inch-thick sheet of extruded polystyrene has an approximate US R-value of 5 (1.
97 B 8408 Surfactant k-factor R-value % closed in polylol cells 1 % Tegostab 0.
For round ducts, the effective R-value is a function of the inner and outer radii [r.
Too expensive to be used as an insulator on its own, epoxy has a high R-value (7 to 9), high strength, and good chemical and moisture resistance.
Table 1 outlines the R-value requirements for a superinsulated home.
If you have roll- or blanket-type insulation, pull up a piece and look at the backing, which should have the R-value printed on it.
r-value is a Pearson product-moment correlation coefficient.
In addition, the rebuilt storefront is specifically designed to meet wind deflection, R-value insulating and UV reflection specifications given Warwick's climate and proximity to weather generated by the Atlantic Ocean.
In addition, the rebuilt storefront is designed to meet wind deflection, R-value insulating and UV reflection specifications given Warwick's climate and proximity to weather generated by the Atlantic Ocean.