A non-halogenated polyiso insulation board can help contribute toward a sustainable building design. EnergyGuard™ NH Polyiso Roof Insulation maintains the same R-value when tested according to ASTM C1289 standard using the C518 test method at both a mean temperature of 40°F (4.4°C and 75°F (24°C) as well as improved R-values at 25°F (-3.9°C) over prior EnergyGuard™ NH Polyiso Roof Insulations.