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Testing R-values


Professional Roofing


3/2015

14

Polyisocyanurate; r-value; long-term thermal resistance; lttr; test; results

In late 2014, NRCA conducted limited R-value testing of polyisocyanurate insulation products. The test results show R-values lower than the product manufacturers’ published long-term thermal resistance (LTTR) values.


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