The rigid foam board R-value measures the material’s ability to resist heat transfer. Different foam materials provide different insulation performance levels. EPS rigid foam boards typically offer R-values between R-3.6 and R-4.2 per inch, while XPS boards provide around R-4.5 to R-5.0 per inch. PIR foam boards offer the highest thermal resistance, with R-values reaching approximately R-6.0 to R-6.5 per inch. Understanding the rigid foam board R-value is essential for architects and engineers when designing energy-efficient buildings because it determines how effectively the insulation reduces heat loss.
What is the typical rigid foam board R-value and why is it important?
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