Polyisocyanrate, often referred to as “Polyiso,” is a rigid foam board insulation bonded to facers on both sides. Polyiso provides a higher R-value per inch compared to other insulations commonly used in commercial and residential construction.
Polyiso has four primary components: MDI (methylene diphenyl diisocyanate), polyol, flame retardant, and a blowing agent (pentane). When combined and catalyzed, a chemical reaction ensues which causes the blowing agent component to boil. The pentane vapors expand which creates gas-filled cells, generating the high R-value.
Common applications include roofing, walls, and ceiling insulation. The use of pentane as a blowing agent has a negligible global-warming potential. With the lowest global warming potential among insulation options, a high energy saving, and its contribution to building resilience, polyiso serves as the most sustainable option for the insulation of commercial and residential buildings.
Polyiso Quick Facts
- R value range of 5.9 to 6.5 per inch of foam
- Outstanding performance in fire tests
- cost-effective and sustainable
- minimizes space, material, and labor requirements
- improves service-life of roofs and walls
- Low density, good adhesion to facers, low water absorption, and low vapor transmission
- Not affected by oil-based waterproofing compounds, insecticides or fertilizers when properly protected
- Cold weather affects the R-value, as temperature decreases, R-value decreases as well