ISO panels have the highest nominal R-value of the three most common types of rigid-foam insulation, R-5.7 to R-6. Its blowing agent is pentane, which has a very low global warming potential. Because ISO starts as liquid foam and has to be sprayed against a substrate to form a rigid panel, all ISO panels are faced. Foil-faced ISO panels are considered vapor impermeable. Paper and fiberglass facers are more permeable and can be used without creating a vapor barrier.  Although the nominal R-value of polyiso is the highest of the three major types of rigid foam, its cold weather performance is lower: As the temperature drops, so does the R-value. Polyiso is not rated for ground contact.

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Common Applications:

  • Pole Barns – walls, ceilings, roofs
  • Steel Buildings – walls, ceilings, roofs
  • Flat and Low Slope Roofs – commercial/industrial/institutional
  • Residential Housing – walls, attics, between studs
  • Garages – walls, ceilings, roofs
  • Timber Frame Houses – cathedral ceilings
  • Berm or Earth Houses

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