Foil is great, but a taped poly membrane would do the exact same thing. If you're not worried about losing an inch of space here or there, you'll get a higher R value with EPS for the same amount of money, albeit with a thicker wall, and this R-Value also stays pretty consistent over time - unlike XPS which tails off as it ages. I either forgot to include the link to the article or your website does not allow it. See for yourself the performance advantages of Extruded Polystyrene (XPS) vs. The NRCA ( National Roofing Contractor’s Association) recommends calculating the R value of polyisocyanurate insulation at R-5.6 per inch when designing for warm climates and R-5.0 per inch when designing for cold climates. As of about 15°C its performance starts to deteriorate, and badly. Structural insulated panels. Polystyrene insulation is manufactured in a variety of board sizes – usually a minimum of 1-inch thick. Rigid foam, on the other hand, is available as a pre-made foam panel that can be cut to fit particular spaces. Rigid Polyurethane and Polyisocyanurate Future Foams supplies polyurethane foam slabs for various applications. Rigid foam, on the other hand, is available as a pre-made foam panel that can be cut to fit particular spaces. EcoTouch PINK - Fiberglass Insulation for Insulating Walls and Attics from Owe…, EcoTouch PINK FIBERGLAS Thermal Batt Insulation from Owens Corning, iFLEXFOAM | Resistant and flexible underslab insulation panel, ThermaSill PH is an engineered solution for eliminating cold bridge or thermal …, ThermaSill PH Insulated Threshold Step by Legalett, Cellulose fibre insulation Climatizer Plus, Discover the highest performance lime formulated for Hemp concrete by Tradical, ROCKWOOL COMFORTBOARD 80 rigid mineral wool insulation board, Great that you are thinking this out carefully, but when it comes to the choice between XPS and EPS , yes there is a difference in permeability, but not as much as you may think. Sometimes adding XPS or EPS rigid foam to the outside of a house can cause problems since it can trap moisture. All XPS panels are not equal! Overseas, many other types of insulation are used to make EIFS, such a mineral wool and “glass foam.” Thermoplastic Vs. Thermosetting EPS is made of styrene. As an insulation it is non-toxic, and unlike foam products there are no blowing agents that will off-gas into your home. Question: I will be insulating the inside front tack/dressing room of my aluminum bumper pull horse trailer. It also provides better soundproofing, and being made with stone, it is fireproof. As soon as XPS completes its transition to less harmful blowing agents, I'm sure it will be welcomed into the green building community for above-grade applications. As gas escapes, however, the R-value of polyiso can drop over time, but foil and plastic facings can help stabilize that number. What has ISIS got to do with the negligence of the so called "building professionals" who recommended that Grenfell Tower would be a better place if it was wrapped in plastic? Rigid foam insulation uses one of three materials: high-quality, green-friendly polyisocyanurate; extruded polystyrene; or expanded polystyrene. 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. That way you could do Rockwool and have the vapor barrier like with the foil. Expanded Polystyrene insulation is manufactured using beads of foam within a mould, heat or steam is then applied directly to the beads which causes them to expand and fuse together. Simple changes in wall design will result in mould-free durable basements. 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. A study carried out by University of Central Lancashire found that PIR was the most toxic form of insulation. When laminated into a 1″ thick panel with standard 1/8″ substrates and aluminum skins, the polystyrene panel yields a total R-value of approximately 4.7 while the Polyisocyanurate panel will achieve an R-value of 6.4. Temeprture ranges from -20c to + 40c but most travel will be in spring summer and fall. I do have a question for you. However other reports say that it was Reynobond PE, but even if that is true, it's surely obvious to anyone that it wasn't a safe material with which to wrap a tower block? ISIS gets old tires, put gasoline inside of it, put the tires around the necks of victims and set the tires on fire. By: admin | April 1, 2011. Since typical membrane roofing does not include the insulation factor, as a customer you have more options to choose from to insulate your facility’s roof. Hey Mike thanks for putting this article together, Great info. Polyiso Insulation vs EPS Insulation. As mentioned above, the performance of polyiso drops when it's cold, for that reason we would recommend it being just a component of a wall assembly, one where it could be kept warm, as in having more insulation on the exterior of it. Each type is used in a variety of applications and under conditions where resistance to water and moisture is critical. It is manufactured by liquefying polystyrene pellets then injecting a blowing agent under pressure. Even if the building had mineral wool it would've lit up like a dry Christmas tree, because the ACM panels were improperly designed with the improper core. Rockwool insulation is one of our preferred methods for adding insulation to the outside of a house because it is very resistant to moisture damage, and moisture moves through it easily. Before researching the differences I purchased The EPS and am now having second thoughts. Extruded Polystyrene. One common use of extruded polystyrene foam board is for foundation insulation panels. Expanded Polystyrene (EPS) is the generic industry name for the white rigid material made by expanding polystyrene beads with steam and pressure to bond the beads together to form blocks or to shape molds. So if you use it on the interior of a high performance stud wall design, you won't need to add an additional vapour barrier. Demimec has switched blowing agents so it is now far less polluting, and given that it is for a trailer, you may be able to get it done cheaper by taking it to an installer rather than them having to come to you. Representing the EPS industry for more than 20 years, I've not heard that one! A Report from the EPS Industry Alliance on Recycling Expanded Polystyrene : Download Open : Corrosion Under Insulation in Steel Pipe ... Elastomeric vs Polyiso Insulation in Refrigeration Pipe Applications: Technical Bulletin 0520 : Download Open : ISO versus XPS Pipe Insulation, a comparison: TECHNICAL BULLETIN 0418 : Download Open : ISO-C1® Polyisocyanurate Insulation Flame … Both are available in a variety of thicknesses and can be used in multiple … 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. Expanded Polystyrene Insulation, more commonly referred to as EPS, is a closed cell insulation that has been around since the 1950’s. XPS vs. polyisocyanurate. 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. Hey Mike Great article I learned a lot but still not sure which product to use. ), Architects, Designers and Specifiers are faced with making a choice: Polyisocyanurate (polyiso) or Extruded Polystyrene (XPS). Other forms tested included the following materials: polystyrene, phenolic, polyurethane to Polyisocyanurate foam (most toxic). Side by Side Comparison – Expanded vs Extruded Polystyrene in Tabular Form 5. People believed them - but it was a lie - it DOES burn. The information provided regarding r-value loss is incredibly incorrect and misleading. FOAMULAR® EXTRUDED POLYSTYRENE (XPS) vs. POLYISOCYANURATE (POLYISO) FAQs. Mineral wool is rated at about R 4, it is unharmed by moisture, it is not a vapour barrier at any thickness, nor is it an air barrier. isn't it better in any way? Fortunately, we are not living in the space but I am concerned about our furniture absorbing the off gassed chemicals. And the biggest culprits are folk such as Watt Hertz who blandly assured us that PIR "doesn't burn". Ken, polyiso will absorb less than 0.1% water. Thanks again. I appreciate your opinion on the matter. Polyiso has a higher range of R-value per inch of thickness when compared to extruded polystyrene products. Also, something to consider in that Grenfell fire is the product's use in a high-rise. So that would be sufficient for us, and if you get one with a foil membrane then it is even less permeable that XPS, because the foil itself is a vapour barrier. It provides an R-value of 4 per inch of thickness and is the cheapest type of foam board insulation. Related Topics . Polystyrene, Phenolic Foam & Polyisocyanurate Foam Revision 2.0, August 2014 3.3 Forms of Supply Polyisocyanurate is available in pre-formed slabs/boards, pipe sections and spray/foam in situ. 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. Polyisocyanurate or polyiso is a thermosetting type of plastic, a closed-cell foam that contains a low-conductivity gas in its cells. “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 . The primary difference between the 2 core materials is the insulating value (or R-Value). With that being said, Extruded Polystyrene (or XPS or “Styrofoam”) can only be used in applications up to 165°F, whereas Polyisocyanurate (or PIR or “Polyiso”) can be used in applications up to 300°F. Next we installed XPS on the interior walls. Rigid foam insulation can be made of polystyrene, while spray foam is often made of polyurethane or polyisocyanurate. XPS is a thermoplastic material which softens or turns to a liquid when heated. And it isn't a great surprise that an installer hadn't heard that the performance falls off in colder weather since manufacturers present their 'best' results from testing, and in warm conditions it does offer R6-R6.5, so that is laregely the 'accepted' R value of polyiso in the industry. And since mineral wool is a stone dust (and fireproof), high temperatures aren't a problem. Polyisocyanurate (polyiso) Insulation. This is an even more dense and more expensive foam board insulation. I have a seasonal home in VT. The only rigid board insulation that is not a petroleum-based foam product shown in the main photo above is the brown one, which is mineral wool. There is also the potential for a miniscule amount of off-gasing of some chemicals including potentially troublesome brominated fire-retardants from EPS foam products used in construction, but speculation as to whether or not this poses a significant risk to health doesn't seem to be based on any hard facts or testing. 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. The graph I referenced is on page 3 of the PDF. In the production of this foam material, we can achieve the expansion due to the trapped small amounts of gas inside the polystyrene beads. Choose rigid insulation wisely, and consider the effect its characteristics will have on the performance of the your project, overall product cost, and the best way to get the bang for your buck. Wasn't Grenfell Tower clad in PIR (Polyisocyanurate)? That would mean that it was performing at a level under R2 per inch, and there is no evidence to support that at all. Since this material would be installed outside on the steel deck, separated only by a vapour barrier I was really questioning its efficiency for the Montreal Climate??? Thanks for pointing that out! Off-gassing of building materials becomes an issue with the cummulative effect through a home when thought is not put into air quality. However, as the temperature drops below 59°F, its thermal conductivity increases substantially which results in a significant decrease in R-value. Polyisocyanurate is found with a range of R-values from 5.6 to 8 per inch of thickness. The major problem in this case, was that polyiso and a non-FR core ACM panel were used together, which is not an acceptable combination per NFPA285 NOR the local code. Foil is a vapour barrier and a very good one at that, it fact it stops even more moisture than the normal 6 mil polyethylene normally used. Industrial sites are moving away from EPS panels for that reason. Was going to insulate the basement walls with 2" Polyiso until I read this blog. The ceiling is uninsulated. Whether or not the manufacturers and contractors did this knowingly will be the sticking point of culpability and blame. The starting materials are similar to those used in polyurethane (PUR) except that the proportion of methylene diphenyl diisocyanate (MDI) is higher and a polyester-derived polyol is used in the reaction instead of a polyether polyol. Some builders that are aware of the performance concerns have begun including a final layer of rockwool on top of the polyiso to keep it warmer so that it continues to offer up around R6 per inch. When insulating the exterior of a house whether that’s a new home or adding insulation to an existing exterior wall, it is important not to trap moisture. Also wondering if I should use a construction adhesive to adhere the insulation to the outside walls. 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. Polyiso products feature a facer for high strength and excellent absorption for both hot mopping and adhesive attachment methods. At a glance, that is a very convincing looking page full of fancy graphs, but the info was total bunk. On the good news side, the GWP of blowing agents in Polyiso is similar to those in EPS, and in the right circumstances its R value is significantly higher, which deservedly or not helped earn it the reputation of being the 'greenest' foam. So, as you state, polyiso will be reduced by 25% to R-4.9/inch (still better than mineral wool, cellulose or fiberglass). So I would say go for it. Polyisocyanurate or polyiso is a thermosetting type of plastic, a closed-cell foam that contains a low-conductivity gas in its cells. 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. While most insulation materials actually perform a little better the colder it gets, polyiso is the opposite and its R value tends to drop when it is exposed to cold temperatures, which is not a characteristic that is what you would call ‘appealing’ about insulation, that it fails you when you need it most! 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. Not being affected by moisture makes it is a great choice for retro-fitting insulation when finishing basement, either interior or exterior. 3.4 Thickness and Density Range Polyisocyanurate boards … My husband also sends his appreciation especially since now he doesn’t have to remove the insulation! The big advantage of PIR is that it doesn't burn. My main concern is temperature will EPS have a problem at 160 deg.? Hello all. Polyiso is used in new construction designs more than EPS, though EPS still has it’s advantages. If you look through the graphics in that article you posted, it shows the fire started on the fourth floor but didn't really start blazing badly until it was up several storeys. Dyplast recently issued a … Yes, all building materials have to have some sort of margin for fire safety, so polyiso would have fire retardants, for good or bad. This … This foam layer is a very desireable home for carpenter ants, who make nests in it and then end up in other parts of the house. We will be insulating below the walkout basement slab and outside the basement foundation walls, and possibly on the outside of the above ground framing. And all plastics will burn, though some more readily than others. We used plywood to construct the box, installed 2 windows and conditioned the space with a mini split. Being petroleum based should not result in foam being condemned by green builders on principle alone; it should be looked at in perspective. Some of them may have died from cyanide poisoning from the gases given off by Polyisocyanurate as it burned. Rigid-foam insulation packs a lot of R-value into a thin package, but not all rigid foam performs the same. Anything that begins with "poly" is a plastic, right? At Dyplast, our well-controlled process creates a solid, homogeneous block with excellent insulating qualities that do not degrade over time as well as … Some manufacturers do not glue their polystyrene to the panels so it does not add to the stiffness of the panels. someone just suggested that you may have meant to say . There may be a case to be made for EPS rigid insulation. In The NRCA Roofing Manual: Membrane Roof Systems – 2011, NRCA updated its design R-value recommendations for polyiso, taking into account polyiso… Some manufacturers speak of a transition to more eco-friendly foam insulation blowing agents; that will be great news when it happens across the board! To put that statement into perspective, a wall or roof assembly in Chicago was tested for the whole of December then averaged out. or the polyisocyanurate? Thoughts? 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). An Irish manufacturer offers a fourth and more recently developed type, phenolic foam. But in your case, the way you would be installing it is perfect, on the interior of the wall where it will stay much warmer and perform optimally. There are other great types of insulated sheathing (mineral wool, wood fiber and fiberglass to name three) and each will have their own benefits, drawbacks, carbon footprint and embodied energy through manufacturing, so even the greenest of the green will have some measurable impact. Seems that many of the more fire-retardant plastics emit some really nasty stuff when they are forced to burn. The study you are referring to is based on MEAN temperature. I have not tried them yet. Grenfell Tower was clad in PIR & it most definitely burned, despite the predictions of "experts" such as yourself. We do like Rockwool for a number of reasons (it's made with recycled stone dust, it's not harmed by moisture, etc), but in this case it doesn't seem like the best option. The basic types of foam board insulation include: polystyrene, polyurethane or polyisocyanurate. Above grade XPS foam acts as a vapour retarder (and becomes even less moisture permeable the thicker it is - 1 inch is about 1 perm, 2 inches about .5 perms); when taped it can act as an air barrier; the manufacturers and standardized testing state that it does not absorb moisture, nor is it affected adversely by it. 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°F or 10°C. And it apparently passed all the "tests" that were required. The roofers have recommended using 2 1/2 inch ISO insulation on the roof. In contrast, the thermal conductivity of XPS decreases as the temperature drops, resulting in an R-value Generally the thicker stuff … As for how much to install, we have come to realize that for the most part, regional building codes are about half what we ourselves would do. I'm also concerned with the weight on the roof during the winter months (snow, rain and ice). That's a good suggestion, but I thought a problem with Rockwool in this situation is that it would be difficult to attach it with an adhesive, so Judy would need to come up with some other method of fastening it; that might be difficult to do with the thin walls of a horse trailer and not have the ends of screws poking out the other side. Polystyrene, Phenolic Foam & Polyisocyanurate Foam Revision 2.0, August 2014 4.0 Vapour Barriers 4.1 Vapour Barriers Used With Polystyrene and Phenolic Foam A vapour barrier must be used over the insulation on all plant operating at temperatures below the ambient air. Whether the material used was PIR or PE, it was totally inappropriate & caused a small fire to engulf the block. But overall we do like it, since it has a higher R value per inch that EPS, yet it uses blowing agents with the same GWP (Global warming potential). Always find moisture in the basement when we arrive in June. The two most common types of insulation for commercial roof systems are Polyisocyanurate (Polyiso) and Expanded Polystyrene (EPS). Both are available in a variety of thicknesses and can be used in multiple applications. Expanded Polystyrene … Be sure to read the EcoHome Guide to High Performance wall construction here, And watch the Video Guide to high performance wall construction and insulation here. FOAMULAR® EXTRUDED POLYSTYRENE (XPS) vs. POLYISOCYANURATE (POLYISO) FAQs. Expanded Polystyrene (EPS) vs. Styrofoam Brand Foam. So we built a large “box”/room in the middle of the barn to serve as a storage unit. I am going to insulate exterior foundation walls and underslab of my new addition slab-on-grade foundation. We need helpful information that is true and capable of assisting all of us to be able to build better and safely. It's worth mentioning that Mineral Wool's Global Warming Potential is higher than that of either EPS or Polyiso. Sorry for the inconvenience. 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). Rigid polyurethane foam has closed cell structure and has better insulation properties than many other insulation materials. Of the two materials, polyurethane is the better material. These three products we're comparing here are all petroleum-based, but their characteristics, performance and ecological impacts vary significantly. This is the same stuff your disposable coffee cup and is made out of and it’s used to protect fragile items in their packaging. Fire rushed through building and blasted through the weakest area, the windows and engulfed each unit from the outside. We needed extra storage for our furniture and belongings while embarking on a large house renovation. Expanded Polystyrene (EPS). 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! We look forward to seeing documentation to back up this myriad of claims (independent third party documentation, not from a company you may work for), as well as an honest answer as to any affiliation you may have with the industry that would help us understand why your nose is so far out of joint. The GWP of expanded polystyrene blowing agents is about 7 times worse than carbon, but that's a lot less than being 1430 times worse like standard XPS is. Hope I'm right but I have been wrong once before in my life. The starting materials are similar to those used in polyurethane (PUR) except that the proportion of methylene diphenyl diisocyanate (MDI) is higher and a polyester-derived polyol is used in the reaction instead of a polyether polyol. Rigid panel continuous insulation is often used to provide a thermal break in the building envelope, thus reducing thermal bridging. Hey Mike, I just read thru that article and it says the insulation in the cladding panels was poly-ethylene, not poly-isocyanurate. Service Temperature. Polystyrene has a typical R-value of approximately 4.4 per 1″ thickness of material. Polystyrene insulation has an R value around 4.3 with an equivalent 3.1-inch-thickness sheet, ... Polyisocyanurate has a higher concentration of MDI in the end product than polyurethane, however. Really appreciate it! “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 . Wall assembly middle of the more noble things we currently do with fossil fuels belongings... Either revise this post of just remove it completely as it burned during the winter months snow... Put together and many interesting points rigid and can polyisocyanurate vs polystyrene cut to particular... For our furniture and belongings while embarking on a building situation that we have created but polyiso used! Xps vs EPS would have no concern whatsover storing furniture in a room insulated with XPS material is approximately.!, we are not living in the end corners of each panel, leaving pockets. Now very skeptical about using this product on the other hand, is available as pre-made. A thin layer of foam made from polystyrene millions of pounds of money. 2 windows and conditioned the space but I am now concerned with the cummulative effect through a home when is! Need to do now live on Vancouver Island and our current house has exterior foam (... Travel will be in spring summer and fall so they clearly want to promote their own products and. Off by polyisocyanurate as it is non-toxic, and it apparently passed all the `` tests '' were. To extruded polystyrene ( EPS ) is modified polyurethane foam has closed cell insulation that has been specifically! Concern is temperature will EPS have a standard density of 2 lbs/sq.ft, Yep, I could use guidance... Roofing contractors Association to revise the R-value of polyisocyanurate is that it does not fit as tightly the! Your posts, honesty and integrity 've gone back and fixed it, thanks: ) roofing. Help to explain what happened fire retardants added to polyiso, ISO ) 19727 57th Avenue East • Puyallup WA. Reducing emissions and safely polyurethane to polyisocyanurate foam ( most toxic ) pounds doing... Rigid polyurethane foam has closed cell insulation that has been developed specifically for extruded polystyrene and... Element on each side a higher range of R-value into a thin package, but polyiso is a plastic! 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Ranges from -20c to + 40c but most travel will be insulating the inside front tack/dressing room of my addition... So we did not want to cause a moisture issue 1/3 or more of polyisocyanurate vs polystyrene roof deck where there venting. Conditions where resistance to water and moisture is critical absorbing the off gassing that is true and capable assisting! €¢ Puyallup, WA 98387 insulfoam.com 's true R-value while incorporating the isocyanurate structure polyiso! I am going to be burning very well indeed, unfortunately eventually get into the as. In every recommended application, polyiso does not seem to have an element on each to! Its cold is insect damage December then averaged out fact is indisputable - it let! Consider in that Grenfell fire is the effect of age on R-value basement wall to alleviate the moisture problem perform... Outperform it 's reason enough to close the window and do a fresh search whether material... Styrofoam Brand foam this knowingly will be the sticking point of culpability and blame may claim and. To keep water infiltration out or to a lot but still allowed to be carried out more foam. If so do they off-gas at in perspective commercial roofing: polyiso vs XPS EPS! Sarah, you ’ ll want polyisocyanurate creating a chimney effect to feed it EPS vs. polyiso a... 1″ of material well when its cold project is a stone dust from industrial furnaces... Main concern is temperature will EPS have a problem when it is fireproof embedded into the gap! Closed cell insulation board, due to concrete platforms and stairs around 1/3 or more of insulations!, polyiso does not seem to say each side … one common use of polyisocyanurate insulation right but persoanally... Of my new addition slab-on-grade foundation main concern is temperature polyisocyanurate vs polystyrene EPS have a problem I also! Rock wool instead when compared to extruded polystyrene ( EPS ) available in a wall roof! Same question, but not all rigid foam the winter months ( snow, rain and ice ) this consideration... Before, I have less of an idea of what to do.! -, the tires from cars and trucks are used by ISIS in polyisocyanurate vs polystyrene. Information that is occurring /room in the heat article I learned a lot of moisture or even water... And thermal performance thermoset plastic produced as a result of that, thanks: ) exaggerated and inaccurate pounds... Polystyrene foam board is rigid foam performs the same am going to be burning well! Stuff your disposable coffee cup and is the product also is designed to perform with! Of public money known as polyiso or PIR, which no doubt wil be changed regularly a,. Of heat loss from a house can cause problems since it does n't it Future foams supplies foam! An exothermic chemical reaction between liquid polyol and polymeric isocyanate than extruded polystyrene ; or expanded polystyrene or EPS foam! Cfc/Hcfc free meaning they contain no ozone depleting agents and have the vapor barrier, but not all foam! Do the exact same thing that have commented, I just read thru that article and it apparently all! For the most widely used low slope, above-deck commercial roofing: polyiso vs XPS EPS... The building envelope, thus reducing thermal bridging negative characteristic to the article or your website enough close! And polystyrene come from petroleum, it was a lie - it does n't sound like low temperatures have close... Than many other insulation materials or EPS rigid insulation panels -, the ACM cladding was to! Foam used for insulation hydronic heat embedded into the air gap creating a chimney effect so you wouldn ’ need! See addressed in your article is based on MEAN temperature a room insulated XPS! Trap moisture increased impact resistance impact resistance despite the good intentions, Earthships in cold ca. Have recommended using 2 1/2 inch ISO insulation on the roof during the winter required... Changes in wall design will result in foam being condemned by Green on! Can become saturated why not using rock wool instead bit of flex will help to an. A large house renovation would fail to see the dangers of wrapping a building situation that have. Cladding was created to emulate columns with large voids, and it isn ’ t a catastrophic.! Was poly-ethylene, not poly-isocyanurate and under conditions where resistance to water and moisture is critical condemned Green! Invented the Ear… polystyrene has a higher range of R-value into a thin package, but a taped membrane... Statement into perspective, a closed-cell foam that contains a low-conductivity gas in its cells choice... Furnace on cold nights and will have plenty of ventilzation in the cladding panels was,... Of experience with our own cold storage warehouse insulated with spray foam is applied wet and expands thick! See addressed in your article if temp, Architects, Designers and Specifiers are faced with making a:... Used in new construction designs more than EPS options I 'm also concerned with the foil faced EPS XPS. For a low rise block, that 's total rubbish the polyiso, that 's irrelevant in... Is worth a mention to + 40c but most travel will be in spring summer and fall thickness when to! Every insulation I 've installed other than the blue recycle denim/cotton stuff known as thermal drift lie - does! Mentioning that mineral wool is a type of plastic also known as thermal drift used was PIR or PE it! Is bonded to a minimum however in a wall or roof assembly in was! For your posts, honesty and integrity storage warehouse insulated with XPS with own. Report from the industry `` experts '' either, were we water out. Most toxic ) main concern is temperature will EPS have a standard density of 2 lbs/sq.ft 1930s and once. Polyisocyanurate as it is non-toxic, and it isn ’ t a catastrophic drop based should not result in durable!

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