R-value

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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 insulation value of the walls is R56 (typical new energy-efficient house is R30); the ceiling is R100 (typical new house is R20 to R40) and the basement floor is R30 (typical house has none).
The downside of using rubber padding is that it provides the least amount of insulation value.
Walls of pre-cast concrete panels have a higher insulation value than similar wall systems.
masonry wall system offers higher insulation value and thermal mass; solar hot water heat and domestic hot water
Ecomate is completely miscible with other blowing agents and is said to provide insulation value between that of HFC-245fa and pentanes.
They provide thermal mass with a high insulation value of R 40 as rated by the Canada Mortgage and Housing Corporation (CMHC).
Its insulation value would go up every year as the trees matured.
An insulation value of R-38 is now recommended, but even getting to R-30 would be great.
The "fiberglass and 2x4 stud" system is simple to construct and the walls are easy to run pipe and wire through, but they take up more space and fiberglass can lose its insulation value if it absorbs water from a burst washing machine hose or other unexpected catastrophe.
They also have five times the insulation value of wood and are generally less expensive.
Further increases will be constrained by slow residential construction activity and declines in single-unit housing starts, since the residential construction market accounts for more than 70 percent of overall fiberglass insulation value.