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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| Aug 11, 2010
Best AEC Firms of 2011/12
Later this year, we will launch Best AEC Firms 2012. We’re looking for firms that create truly positive workplaces for their AEC professionals and support staff. Keep an eye on this page for entry information. +
