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Not quite measuring up


Professional Roofing


7/2017

24-25

Polyisocyanurate insulation thicknesses; length, width and thickness dimensions of polyisocyanurate insulation

NRCA has received a limited number of reports of faced, rigid board polyisocyanurate insulation with thicknesses less than what was specified and indicated on the insulation’s package labeling being delivered from manufacturers to distributors and job sites. Following is information about these reports, as well as information about recognized allowable thickness tolerances and NRCA’s recommendations to roofing contractors for monitoring this situation.


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