Polyiso Manufacturers Turn Blind Eye to Problems at Cold Temperatures
R-values that fluctuate with temperature can be a serious problem with polyiso in some climates. New design guidance could help.
by Paula Melton
When word spread that the chemicals used to make high-performance foam insulation were actually massive contributors to global warming, polyisocyanurate (polyiso) manufacturers were among the first to reformulate. But it turns out that pentane, the new blowing agent, has a problem of its own: a potential 9%–28% drop in R-value at cold outdoor temperatures—just when insulation is most needed. And almost five years after this issue first came to light, polyiso manufacturers are still denying it’s a problem and haven’t taken action to improve performance at extreme temperatures.
Published December 1, 2014
Melton, P. (2014, December 1). Polyiso Manufacturers Turn Blind Eye to Problems at Cold Temperatures. Retrieved from https://www.buildinggreen.com/news-analysis/polyiso-manufacturers-turn-blind-eye-problems-cold-temperatures