How Do Polyiso, XPS, and Mineral Fiber Roof Insulation Compare?

The recommended insulation R-values for commercial roofing continue to increase and save energy costs. States adopt these recommendations at different speeds, but the bottom line is that insulation is becoming more important than ever.

The following table shows how ASHRAE (American Society for Heating, Refrigerating, and Air Conditioning Engineers) and the International Energy Conservation Code (IECC) have promoted greater insulation over the past decade. For example, back in 2004 in zone 5, the equivalent of 2.6 inches of polyiso insulation was recommended compared to 6.0 inches of polyiso in 2015.

Whatever your preferred choice of insulation board, it’s clear that the amount of insulation required by building codes is going to keep increasing. On balance, after reviewing the specifications and pros and cons of each material, polyiso foam is an excellent option.

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