Benefit from the Best.

As one of the most widely used and readily available building products, Polyiso is a cost-effective insulation option for reducing building energy use and improving the overall service-life of roofs and walls

What are the benefits of Polyiso insulation?

  • High R-value per inch of thickness

  • Excellent fire test performance

  • Extensive building code approvals

  • Cost-effective continuous insulation (ci) solution

  • Compatible with most wall and roof systems

  • Dimensional stability

  • Compressive strength

  • Moisture resistance

  • Thinner walls and roofs with shorter fasteners

  • Long service life

  • Compatibility with most solvents used in construction adhesives

  • A wide range of service temperatures

  • Zero ozone depletion potential 

  • Recycled through reuse

  • Virtually no global warming potential

  • QualityMark certified LTTR values

Value Added Insulation.

Does Polyiso have a high R-value?

Polyiso has a high R-value per inch when compared to other insulation products, see chart below. This allows Polyiso products to deliver more energy savings potential for buildings than other materials of the same thickness.


Polyiso offers a R-6.5 and the highest R-value per inch when compared to other insulation.

What is LTTR?

Based on consensus standards in both the United States and Canada, Long Term Thermal Resistance (LTTR) is a scientifically supported method to calculate the 15-year, time-weighted average R-value of roof insulation. All Polyiso manufacturers of the Polyisocyanurate Insulation Manufacturers Association (PIMA) have adopted the LTTR method as the exclusive means to measure thermal performance of permeable-faced Polyiso roof insulation. PIMA Polyiso manufacturers have certified LTTR-value products verified by the QualityMarkcm Program. 

What is QualityMark?

The PIMA QualityMark Certification program is a voluntary program that allows Polyiso manufacturers to obtain independent, third-party certification for the Long Term Thermal Resistance (LTTR) values of their Polyiso insulation products. Polyiso is the only insulation to be certified by this unique program for its LTTR value. The program is administered by FM Global and was developed by the Polyisocyanurate Insulation Manufacturers Association (PIMA) based on work done at Oak Ridge National Laboratory and CAN/ULC- S770. Click here to view the QualityMark Brochure.

Looking for Polyiso Continuous Insulation?

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Rmax insulation has been designed and tested to provide homes with superior insulating protection, while meeting the newest codes and requirements.



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