SC Roofing Contractor Practice Questions - South Carolina General Contractor - Roofing Subclass Exam

Which insulation material provides the highest R-value per inch for commercial roofing applications?

Expanded polystyrene (EPS) Extruded polystyrene (XPS) Polyisocyanurate (polyiso) Perlite board

Correct Answer:

Polyisocyanurate (polyiso)

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