It has some of the highest R-value out there, it lasts a long time, it's eco-friendly, and it can create a vapour barrier! A major source of heat loss from a house is through walls. All of the insulations listed above are petroleum-based products that require significant energy to manufacture resulting in a high-embodied carbon footprint. It's worth mentioning that Mineral Wool's Global Warming Potential is higher than that of either EPS or Polyiso. Grenfell is still in litigation, but from what I know, it was an improper combination of polyiso and a non-fire-rated ACM panel that was not approved by the code officials. “For example, when both products are used as wall sheathings, the ASHRAE Design R-value for 1” foil faced polyiso is higher per actual inch versus polystyrene, when tested at 75°F mean temperature,” as stated by the Polyisocyanurate Insulation Manufacturers Association . >Last I checked R value per dollar put polyisocyanurate and polystyrene >equal, the polyisocyanurate has foil both sides which has to account >for some radiant advantage. The permeability of EPS can be handy at times if you want to add insulation to an existing wall assembly but are worried about trapping moisture, like retrofitting the exterior of buildings with additional insulation. 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. This code consideration eliminates the requirement or inclusion of sprinkler systems. Note: 1 perm and 60 ng are U.S. and Canadian equivalent rates of permeability, below that rate of permeability classifies a material as a type II vapour retarder, suitable for residential construction. Just in case I'll post it here again. EPS vs. polyiso: A climate change for roof insulation. However, after doing some research  and reading on this site, I am now concerned with the off gassing that is occurring. Polystyrene has a typical R-value of approximately 4.4 per 1″ thickness of material. Our personal overall preference due to its recycled content and versatile applications is probably mineral wool, but as for the petroleum plastic rigid foam insulation products - polyisocyanurate gets top marks for being 'eco' if you are in a warmer climate and can handle its moody disposition. So our recommendation would be to find out what is specified in the regional Building Code (which is a bare minimum) and probably double it. Sponsored Links . Foil is great, but a taped poly membrane would do the exact same thing. An error occurred. Polyisocyanurate/ Polyurethane foam (PIR/PUR) Polyurethane (PUR and PU) is a polymer composed of organic units joined by carbamate (urethane) links. Expanded polystyrene insulation and polyisocyanurate foam polyiso are the two main insulation types used in EIFS in North America. Molded or expanded polystyrene is commonly called beadboard and has a lower R-value than extruded polystyrene. Rigid foam, on the other hand, is available as a pre-made foam panel that can be cut to fit particular spaces. Polyisocyanurate (polyiso) Insulation. This article says that PIR was used. Shouldn't the so called "building professionals" who recommended wrapping Grenfell in plastic have known this? It also provides better soundproofing, and being made with stone, it is fireproof. For reference sake, the traditional 6mil polyethylene vapour barrier has a permeability rating of 3.4 ng, making it about 18 times more vapour resistant than building codes allow. So I would say go for it. Hi Sam, I did remove the link since we don't allow outbound links to private companies in the comments sections, and, particularly not to pages full of nonsense like that one :). With EPS or XPS, once it starts burning, the whole thing is going up. Any recommendations  for this application? ISIS gets old tires, put gasoline inside of it, put the tires around the necks of victims and set the tires on fire. See for yourself the performance advantages of Extruded Polystyrene (XPS) vs. Here is the fun part - Since there is foil on either side of the panel, you end up with a harmless second vapour barrier, which is usually heresy in building design. At 2 inches thick, EPS is about 1 US perm which is the the defining point of being a suitable ‘vapor barrier’ in  residential constrution. As pressure builds, the beads are tightly fused together. Polyisocyanurate, more commonly referred to as polyiso insulation or ISO, is a closed-cell rigid foam board used in more than 70% of commercial roof construction. One potential negative characteristic to the use of polyisocyanurate is that, as it ages, it undergoes a process known as thermal drift. Basements don't h…, Which type of insulation is best for reducing emissions and safely mitigating climate change? For a Silicone Silicate render system with EPS of 100mm thickness the cost per pack of 6 sheets (Size: 1000mm x 500mm) is £8.33 while for mineral wool of 100mm the cost per pack of 2 sheets (Size: 1200mm x 600mm) is £14.58. This … Most insulation products actually perform a bit better the colder it gets but polyisocyanurate breaks that rule. FOAMULAR® EXTRUDED POLYSTYRENE (XPS) vs. POLYISOCYANURATE (POLYISO) FAQs. Mineral wool /Rockwool is completely unharmed by moisture, so in situations where there may be water or humidity concerns it can be a good failsafe choice. Any inward-bound moisture would be stopped at that inner layer of foil, which will be warmer than the foil on the other side, so you reduce your risk of summertime condensation. Calculate the rate of heat flux through a wall 3 m x 10 m in area (A = 30 m 2).The wall is 15 cm thick (L 1) and it is made of bricks with the thermal conductivity of k 1 = 1.0 W/m.K (poor thermal insulator). Either way, polyiso has been tested in over 100 different configurations for NFPA 285 compliance and can be used with a fire rated core ACM panel. 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