Where Can I Buy Foam Insulation Board May 2026

: Foil-faced boards (common in Polyiso) act as a radiant barrier and vapor retarder, while unfaced boards are more breathable.

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: Polyiso typically offers the highest R-value per inch (approx. R-6.0), followed by XPS (R-5.0), and EPS (R-3.6 to R-4.2). Moisture Resistance : Foil-faced boards (common in Polyiso) act as