![]() ![]() Polyiso Foam Panel Insulation Conclusion: In real terms, using polyiso foam insulation panels is probably a poor choice if your winter temperatures dip below 50☏ or 10☌. ![]() The product also is designed to perform well with mechanical fasteners, possibly under Green Roof membranes. Polyiso products feature a facer for high strength and excellent absorption for both hot mopping and adhesive attachment methods. Polyiso insulation boards are the most widely used low slope, above-deck commercial roofing insulation. As a versatile choice for commercial roofing applications, polyiso is designed to be part of any modified bitumen, built-up, or single-ply roofing system. It won't offer nearly the thermal protection you think it will in the dead of winter, and it may cause moisture damage due to its lack of permeability. The news of Polyiso's R value petering out when you need it most still hasn't permeated entirely through the building industry, so you still see it being installed occasionally on the exterior of walls in cold climates. Polyisocyanurate rigid foam insulation board with aluminum foil facing © Ecohome It can be a great product to use as long as you keep it warm, which is a really odd thing to say about an insulation product. As of about 15☌ its performance starts to deteriorate, and badly. By the time you get down to the -20s Celsius it's nowhere near that. Thermal performance is rated at R6-6.5 per inch, but don't count on that if your winters are cold for the reasons we're about to explain. Most insulation products actually perform a bit better the colder it gets but polyisocyanurate breaks that rule. PIR, polyiso, or ISO, is a thermoset plastic product typically produced as a foam and used as rigid thermal insulation panel - most often with aluminum foil facing. Alternatively, depending on application and budget, you could always choose natural Green Insulation Products, Like Hemp Insulation panels or Batt Insulation or mineral wool - demonstrated here in roof insulation. These three products we're comparing here are all petroleum-based, but their characteristics, performance and ecological impacts vary significantly. When building or renovating a high-performance building envelope there are really three main kinds of rigid foam panels you are going to have to choose from - Polyisocyanurate known as Polyiso (PIR), Extruded Polystyrene (XPS) - often called Styrofoam - and Expanded Polystyrene (EPS).īefore choosing, you should know exactly what you expect these foam insulation panels to do, to make sure you buy and benefit from the right one. Polyisocyanurate (PIR), Extruded Polystyrene (XPS), Expanded Polystyrene (EPS) or Styrofoam? ![]()
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