NRCA: Roofing insulation performance, local climate keys to computing R-value

To minimize the loss of thermal resistance in design, the R-value of roof insulation should be computed based on the actual performance of the insulation material and the local climate, says the National Roofing Contractors Association.

July 19, 2012

To minimize the loss of thermal resistance in design, the R-value of roof insulation should be computed based on the actual performance of the insulation material and the local climate, says the National Roofing Contractors Association.

The long-term thermal resistance method of determination may generate an R-value required by the building code, but it does not take into account thermal resistance loss when metal fasteners are employed, according to a study.

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