Since the early 1980s, there has been an ongoing debate in the
U.S. roofing industry regarding the long-term thermal performances
of rigid board polyisocyanurate insulation used in low-slope roof
If you are involved in the design or installation of low-slope
roof assemblies using polyisocyanurate insulation, you should be
familiar with recent and upcoming developments regarding this
In November 1987, NRCA and the Midwest Roofing Contractors
Association issued a joint technical bulletin regarding the
in-service R-value for polyisocyanurate and polyurethane...
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