Polyisocyanurate (or polyiso) foam board insulation is more efficient than EPS foam board insulation. | | True | 53% | | False | 26% | | Not sure | 20% | | | | | Question: Polyisocyanurate (or polyiso) foam board insulation is more efficient than EPS foam board insulation. Top Answer (53% of 15 votes): True.
Answer: True
Explanation: Polyiso has a higher R-value per inch than EPS, which makes it more efficient at insulating in a smaller space. It’s often used in roofs and walls where performance matters and space is limited. EPS is still good, but polyiso usually insulates better.
| | Colorado Insulation Experts | Answer: False
Explanation: Both have the same R value, and both are not as good as Radiant Barrier | | USA Home Pro Services LLC | Answer: True
Explanation: Polyiso has an R value of 6.5 per inch of thickness, while expanded polystyrene (EPS) is 4 per inch. Extruded polystyrene (XPS) has an R value of 5 per inch. | | Progressive Energy Services | | | ProMatcher | Answer: True
Explanation: More efficient | | TLS Energy Savers |
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