The thermal resistance of insulation or a glazing system. The R-value is the reciprocal of the U-value. The higher the R-value, the less heat is transmitted throughout the insulation or glazing materi [..]

  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 [..]

A unit of thermal resistance used for comparing insulating values of different material. It is basically a measure of the effectiveness of insulation in stopping heat flow. The higher the R-value numb [..]

The resistance a material has to heat flow. Higher numbers indicate greater insulating capabilities.

The ratio of the true width strain to the true thickness strain in a sheet tensile test, r = Eu/Ei. A high r-value indicates material with good drawing properties. Also called plastic strain ratio.

The thermal resistance of a glazing system. The R-value is the reciprocal of the U-value. The higher the R value, the less heat is transmitted throughout the glazing material.

Resistance to thermal transfer or heat flow. Higher R-value numbers indicate greater insulating value. R-value is frequently used by the insulation industry and is the reciprocal of U-factor, a value more generally used in the window industry.

The thermal resistance of a glazing system expressed ft2/hr/oF/Btu (m2/W/oC). The R-value is the reciprocal of the U-value. The higher the R-value, the less heat is transmitted throughout the glazing [..]

A measure of the thermal resistance of material, especially insulation.

A measure of the capacity of a material to resist heat transfer. The R-Value is the reciprocal of the conductivity of a material (U-Value). The larger the R-Value of a material, the greater its insula [..]

resistance value, used specifically for materials used for insulating structures. Three inches of fiberglass insulation has an R-value of 11.

A numeric way of expressing the resistance to the flow of heat through a certain thickness of material. The higher the number, the better the value for use as insulation.

R-value measures a substance's resistance to the flow of heat. It's most commonly used when discussing insulation products but is useful to understand when looking at windows because it' [..]

A measure (h ft2 °F/Btu) of thermal resistance, or how well a material or series of materials resists the flow of heat. The R-value is the reciprocal of the U-factor.

A measurement used to describe the resistance to temperature changes in insulation.

A measure of the ability of a substance or combination of substances (as building material or insulation) to retard the flow of heat, with higher numbers indicating better insulating properties.

Thermal resistance of a material. Expresses the ability of a particular thickness of the material to resist heat flow. The higher the number, the more thermal resistance the material has.

The measurement of resistance to heat transfer in a material. The higher the R-Value, the greater the insulation value.

Resistance to thermal transfer or heat flow. Higher R-value numbers indicate greater insulating value. R-value is reciprocal of U-factor (or rate of heat flow). Safety glass:

 A measure of resistance to heat flow; a higher value indicates better heat-insulating property. Rail

Thermal resistance, a measure of a material's or a construction's ability to retard heat flow. R-Values in a series of materials can be added to determine a construction's total thermal [..]

The thermal resistance of a given material.

A measure of the capacity of a material to resist heat transfer. The  R-Value is the reciprocal of the conductivity of a material (U-Value). The  larger the R-Value of a material, the greater its insulating properties.

Resistance a material has to heat flow. The higher the R-value, the greater the resistance.

The capacity of a material to resist the transmission of heat. The R-value is calculated by combining the lamda value (thermal conductivity) and the thickness of the material. Hence R=t/λ, where & [..]

Measure of resistance to heat flow; the higher the R-value, the lower the heat loss. The inverse of U-factor.

  The measured resistance of a material to heat transfer. Every material used for construction has an R-Value and the R-Value is the amount of resistance to heat flow through any given construction ma [..]

A measurement of thermal resistance, used to assess the effectiveness of insulating materials.

A measure of thermal resistance of a material, equal to the reciprocal of the U-Value. The R-Value is expressed in terms of degrees Fahrenheit times hours, times square feet per Btu.

Plastic strain ratio r is a measure of the ability of a sheet metal to resist thinning or thickening when subjected to a tensile or compressive force. It is typically advantageous if the material reduces in area a minimal amount when subject to this force, meaning a good drawing material has a high r value. Once the material is taken beyond its ela [..]

A term used to express the insulating values of a material or unit. A higher R-value results in a better insulating properties. R-value is the inverse of the materials U-value. (R=1/U).

A measurement of how much a material resists heat transfer. A higher R-Value means a greater insulating effect and a lower rate of heat flow out of the home.