A Short Guide To Polyisocyanurate Insulation

Polyiso also known as polyisocyanurate Insulation or PIR Insulation is getting a lot of attention today. It is one of the most widely used building material in the world. Polyiso Insulation is a rigid foam insulation accounts for more than 75 percent of insulation used in commercial and residential building construction in North America.  Polyisocyanurate insulation is a closed-cell, rigid foam board insulation that is bonded to facers on both sides of the board. Closed-cell foam states that the cells in the polyiso insulation materials are enclosed and are not connecting with other cells or are also not combined with air. Polyiso is composed of various inorganic and organic materials. To be Specific Polyiso has four major components like polyol, fire retardant, blowing agent and MDI (methylene diphenyl diisocyanate). 


 Polyiso foam cell structure

Polyiso is used in multiple places like roof, wall, floor, ceiling and specialty application with residential and commercial buildings. Polyiso is virtually equal to gypsum in all features like moisture resistance, fire resistance, and other uplift properties. But on the other hand, polyiso has the highest per inch of R-value among other insulation materials.


Benefits of Polyiso

  • Polyiso insulation provides a high R-value per inch when compared to other insulation products used in residential and commercial buildings.
  • Polyiso offers and exclusive third-party certification of thermal insulation.
  • Easy to transport and install. 
  • It is easy to lift and cut.
  • Economical cost per R-value of Polyiso insulation is more than any other insulation. 
  • Excellent performance in fireproof test.
  • Polyiso has low density and is designed for use in accordance with the code compliant application.
  • Polyiso insulation is stable over a high range of temperature range which is -100°F to +250°F. 
  • It offers a high strength, low water absorption, and less vapor transmission and is compatible with almost all construction adhesives.

Top brands and products of Polyiso insulation

  • Hunter
Hunter Insulation materials are designed to produce all-weather thermal protection. Hunter offers glass fiber infused impermeable foil facing material made form polyisocyanurate foam board core. This company is providing continuous insulation solutions from last 17 years. For rigid foam board insulation, you can rely on all the products offered by Hunter. Hunter panels are available for all application areas like walls, roof, floor, and base ceilings. 
  • XCI (Exterior Continuous insulation)
XCI ply is composed of closed cells polyisocyanurate foam and is a highly rigid insulation panel and is bonded to a premier glass facer on one side and fire treated plywood on the other. XCI is specially designed to be used in commercial wall applications as it provides a continuous insulation within the construction. Below are few XCI polyiso boards that Hunter offers:
  • Hunter XCI Foil Panels
  • Hunter XCI Class A Panels 
  • Hunter XCI Ply Panels
  • Hunter XCI CG Panels 


    • R-Max
    R-Max has been an innovator and manufacturer in building insulation solutions since 1978. All R-max Insulation materials are of high quality and designed in a way to deliver maximum R-value when installed properly. R-max insulation products have minimum environmental impact. Polyiso foam board insulation provides long term thermal resistance values over a period of 15 years. All R-Max insulation products are HCFC and CFC free. 
    • Rmax Thermasheath
    Thrmasheath is a rigid foam plastic thermal insulation board. Rmax thearsheath offers a great R-value per inch currently available in a rigid foam board. Rmax is installed to the exterior or the interior face of the metal studs or the wood, plates, sills and header construction. It also offers a vapor and moisture resistance in the above-grade application areas. Rmax also offers superior fire protection when compared to all other rigid foam insulation materials. 
    • R-max Thermasheath-XP
    R-max Thermasheath-XP is specially designed for residential insulation needs. It is engineered to provide optimal energy efficiency and ease of construction. Rmax Thermasheath-XP has a closed-cell polyiso foam core and is bonded with a highly durable aluminum facer on both sides. It is manufactured to use without a thermal barrier which in turn will provide an attractive interior finish. 
    • Ecomaxci
    R-max Ecomaxci offering enhanced durability and fire performance and has glass fiber reinforced aluminum foil facers on both sides. Polyiso boards offer optimum efficiency through multiple design, ease of installation and reduced energy usage. 
    • Thermax insulation

    Thermax insulation consists of glass fiber infused polyiso foam board core and is a non-structural, rigid board insulation. Thermax insulation board have reflective aluminum facers on both sides. The glass fiber infusion in polyiso foam board core increases the fire resistance and stability of the material. For maximum fire performance, it is advised to use Thermax sheathing in strict accordance instructions.  Go here for more info: https://www.insulation4us.com/



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