In 2006, buildings consumed almost 40 percent of overall energy in the United States, according to a report from Massachussetts Institute of Technology. In today’s environmentallysensitive times, thermal insulation contributes to optimization of energy usage, ensuring that unwanted heat transfer between warm and cool areas is minimized. The thermal resistance, or Rvalue, of insulation material is a measure of its ability to prevent the flow of heat energy in either direction, and in the United States is usually measured in square feetdegrees Fhour per British thermal unit. Converting Rvalues to the equivalent thermal conductivity, Uvalues or to metric units is easily accomplished.
Things You'll Need
 Calculator
Convert RValue to UValue

Note the Rvalue that you wish to convert. This may be expressed in the form R19 or simply as a number. Check that it is given in square feetdegrees Fhour per Btu.

Divide the Rvalue into 1 and note the result. For example, if the Rvalue is 19, the result is 0.0526.

Check your calculation. Record the result, which is the Rvalue converted to the Uvalue in Btu per square footdegrees Fhour.
Convert Imperial to Metric

Note the Rvalue that you wish to convert. This may be expressed in the form R19 or simply as a number. Check that it is given in square feetdegrees Fhour per Btu.

Multiply the Rvalue by 0.1762 and note the result. For example, if the Rvalue is 19, the result is 3.348.

Check your work. Record the result, which is the Rvalue converted to square metersdegrees Celsius per watt.
Related Searches
References
 Photo Credit Jupiterimages/Photos.com/Getty Images