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Polyisocyanurate (or polyiso) foam board insulation is more efficient than EPS foam board insulation.

True
58%
False
25%
Not sure
16%
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Question: Polyisocyanurate (or polyiso) foam board insulation is more efficient than EPS foam board insulation.
Top Answer (58% of 12 votes): True.

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
Answer: Not sure
Explanation: Both have different applications.
MetroNYInsulation.com
Answer: True
Explanation: More efficient
TLS Energy Savers
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