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Polyisocyanurate update

Midwest Roofer


7, 12

polyisocyanurate; ASTM C 1289-99; material standard

In March 2000, NRCA issued Technical Bulletin 2000-3, "Use of cover baords over polyisocyanurate insulation" which followed a letter to NRCA's members from NRCA's Technical Operations Committee in May, 1999. Both documents raised concerns regarding the performance of polyiso insulation used in low-slope membrane roof systems. Since the technical bulletin and letter were issued, there have been significant developments related to polyiso insulation, which follow in this article.

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