Phenolic Foam Product description

Based on research conducted for this book, the phenolic foam insu­lation board industry in both Canada and the United States declined rapidly and essentially disappeared in 1993-1994. Incidents of deck corrosion have been reported in cases where the insulation is in direct contact with steel roof decks and moisture is present.11

Phenolic foam board products were manufactured from phenol formaldehyde resin as an open – or closed-cell product. For several years, a high-R-value phenolic rigid insulation board was on the market. This closed-cell insulation had a typical R-value of 8.3 per inch. Because the foam boards often shrank, warped, or decom­posed, manufacturers stopped making them.12