RI Roofing Contractor Practice Questions - Rhode Island Commercial Roofing Contractor Exam

Which roofing insulation material has the highest R-value per inch?

Expanded polystyrene (EPS) Extruded polystyrene (XPS) Polyisocyanurate (polyiso) Mineral wool (rock wool)

Correct Answer:

Polyisocyanurate (polyiso)

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