What are the limitations or drawbacks of using XPS?

  • Cost: Higher initial cost compared to some other insulations like EPS.
  • Environmental Impact: Historically high GWP of blowing agents (though improving).
  • Sustainability: Recycling is difficult and not widely available.
  • Thermal Bridging: As a board insulation, it does not eliminate thermal bridging at framing members unless installed as a continuous exterior layer.
  • Vapor Retardancy: It is a vapor semi-impermeable to impermeable material, which requires careful consideration of wall/roof assembly drying potential to avoid moisture trapping.


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