Polyiso vs EPS vs XPS: Which Foam Board Is Best for Energy Efficiency?
Explore the differences between Polyiso, EPS, and XPS foam boards to find the best insulation for energy efficiency based on climate and budget.
Polyiso vs EPS vs XPS: Which Foam Board Is Best for Energy Efficiency? When choosing between Polyiso(https://diyecohomes.com/blog/polyiso-insulation-pros-cons-when-to-use/), EPS, and XPS foam boards for insulation, your decision depends on climate, application, and budget. Here's a quick breakdown: - Polyiso: Offers the highest initial R-value (R-6.0 to R-6.8 per inch) but loses efficiency in cold temperatures. Best for roofs and walls in warmer climates or stable indoor conditions. - EPS: Affordable with consistent R-value (R-3.6 to R-4.2 per inch) across temperatures. Ideal for budget-friendly projects, interior walls, and below-grade insulation. - XPS: Excels in moisture resistance and compressive strength with a reliable R-value (R-5.0 to R-5.2 per inch). Perfect for basements, foundations, and wet environments, though it’s the most expensive option. Quick Comparison | Feature | Polyiso | EPS | XPS | |---| --- |---| --- | | Initial R-Value | R-6.0 to R-6.8 | R-3.6 to R-4.2 | R-5.0 ...