- 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.

