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![Owens Corning says Polyiso at 15°F is R-2, a 66% drop. Energy Vanguard says the loss is 25%, so still R-4.5. Who's right? - GreenBuildingAdvisor Owens Corning says Polyiso at 15°F is R-2, a 66% drop. Energy Vanguard says the loss is 25%, so still R-4.5. Who's right? - GreenBuildingAdvisor](https://i1.wp.com/energyvanguard.com/wp-content/uploads/2013/04/insulation-r-value-temperature-dependence-polyiso-polyisocyanurate.png?resize=440%2C273&ssl=1)
Owens Corning says Polyiso at 15°F is R-2, a 66% drop. Energy Vanguard says the loss is 25%, so still R-4.5. Who's right? - GreenBuildingAdvisor
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