Polyiso Insulation: Pros, Cons, and When to Use It
By Graham Mann | Published: 11/7/2025
Explore the benefits and drawbacks of polyiso insulation, including its thermal efficiency, installation tips, and best applications for energy-efficient building.
Polyiso Insulation: Pros, Cons, and When to Use It Polyiso insulation is a high-performance, rigid foam material widely used in construction for its high R-value per inch and slim profile. It’s ideal for maximizing energy efficiency in tight spaces and is often chosen for continuous insulation in walls, roofs, and retrofits. However, it comes with a higher upfront cost and reduced performance in very cold climates. Here’s a quick overview: - Strengths: High thermal efficiency (R-5.6 to R-7.0 per inch), fire resistance, moisture resistance (with the right facer), and durability. - Limitations: Higher cost compared to alternatives and lower effectiveness in temperatures below 50°F. - Best Uses: Exterior walls, roofs, and below-grade applications in moderate to warm climates. Polyiso is a strong choice for projects where space-saving insulation and long-term energy savings matter most. Proper installation and climate considerations are key to getting the best results. How to Install Polyi...
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