Extruded Polystyrene the Best Roof Insulation

Insulation in roof/ceiling assemblies is typically designed for greater thermal resistance than wall systems. Therefore, roof insulation provides the greatest environmental impact.

Common low-slope roof insulations include: Isocyanurate, perlite, woodfiber, fiberglass, cellular glass, XPS, EPS, and composites. Your article stated that durability was important but devoted little time to this issue. Moisture resistance is the most important durability characteristic for roof insulation. Moisture-sensitive insulation should not be used in a dangerous environment (like a roof) because it risks compromising thermal resistance. Other important durability factors are resistance to:

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