![]() The prescriptive requirements of the code for, say, opaque wall assemblies can be met in one of two ways. ![]() However, it is always advisable to verify such claims by a review of test data supporting the published values. R-values of many common building materials can be found in ASHRAE 90.1 in, for instance, Table A9.4.3-1, “R-values for Building Materials.” Manufacturers are also good sources for R-values of specific products. The reciprocal of a material’s R-value is its U-factor, or its tendency to transfer energy. ![]() Understanding thermal efficiency Eventually, high-efficiency detailing that cuts energy use will likely be mandated by code.Įvery material used in construction can resist the transfer of energy-this is its R-value.
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