Apr. 14, 2025
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Extruded Polystyrene, referred to as XPS insulation, is a closed-cell insulation product commonly used in remodeling and new construction applications. Due to the manufacturing process, polystyrene board insulation is typically available only in standard dimension square or rectangular boards. Brands of XPS rigid insulation are generally recognizable by the color of the insulation: blue made by Dow, pink made by Owens Corning, green made by Kingspan, etc.
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Extruded polystyrene (XPS) foam is rigid foam providing a strong, yet lightweight and flexible insulation solution that is resistant to water absorption, making it ideal for a range of building and commercial applications.
Extruded polystyrene (XPS) foam is rigid insulation that's also formed with polystyrene polymer, but manufactured using an extrusion process, and is often manufactured with a distinctive color to identify product brand.
Domestic and Commercial application areas for Extruded Polystyrene (XPS Foam) is as follows
The use of Extruded Polystyrene Foam insulation in commercial and residential buildings offers great flexibility, compatibility, and thermal efficiency for use in all areas of a building envelope.
Extruded Polystyrene Board is ideal for a range of uses – from wall and ceiling insulation, cool rooms & refrigeration, under the concrete slab (i.e. car park), and even for architectural modeling or hobby model making.
Extruded Polystyrene (XPS Foam) has a perm rating of around 1, making it semipermeable. Thicker faced XPS is stronger and can have a lower perm rating, but it is still considered a vapor retarder, not a vapor barrier.
Extruded polystyrene (XPS) likewise improves with colder temperatures. Its nominal R-value is 5 per inch. This is the foam you see used a lot for exterior wall sheathing. It's generally blue (Dow) or pink (Owens-Corning). Extruded Polystyrene Foam will off-gas and lose some insulation performance over time - especially below-grade and when tested in real-world applications.
Both pink and blue xps foam insulation are rigid insulation panels made from extruded polystyrene. The chemical composition, manufacturing process, and insulating capability of the two products are similar and the principal difference between them is that they are manufactured by two different companies.
Pink foam board is manufactured by Owens Corning, and it's marketed under several different brand-specific product names, including Foamular, Propink, Thermapink, and Insulpink. Blue foam board is manufactured by Dow Chemical Co., and it's marketed under the Styrofoam brand name.
When using Extruded Polystyrene Insulation (XPS), it is very important to install the product properly, as incorrect installation or exposed areas are violations of many building codes.
Extruded Polystyrene Board vs eps insulation
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Above grade Extruded Polystyrene Insulation foam acts as a vapor retarder. When Extruded Polystyrene Insulation is 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.
Read MoreWhen using foam board insulation in residential and commercial properties the most common boards used would be Polyiso (polyisocyanurate), EPS or XPS. Each type of board insulation is very different and carry different R-values and compressive strength. So let's have a deeper look at rigid foam.
Polyiso is short for Polyisocyanurate and can also be called PIR for an even shorter version. Polyiso would be one of the best-performing foam board on the market today giving the highest R-values for the least thickness.
Polyiso insulation can be used in so many different locations and effectively can totally replace glass wool and mineral wool in almost every application. The most common places you will find Polyiso insulation would be stud walls, floors, cavity walls, roof spaces/attics, and external walls. However, we are seeing in the market today a rapid growth in popularity with Polyiso in the flat roofing sector on commercial buildings. Special cloth faced or glass tissue faced Polyiso is being used on high rise buildings when replacing the older asbestos roofing materials that were used in the ’80s. Polyiso boards are the architect's products of choice for this application. The reason being is first of all the insulation does not absorb moisture, it is strong and its high R-values per inch is currently in today's market best in class for the applications in which it is used.
Polyiso insulation can also be used whereby air-tightness is required. Taping the joints and sealing the edges along with using airtight membranes will create an airtight home while maintaining a AAA rating for your homes insulation values.
If you wish to install this insulation in your stud walls it is easily cut with a box knife of a carpenter's handsaw. If you are using a handsaw it is a good idea if possible to cut the foil face on the insulation before you start to cut the insulation. This is not a necessity rather more of good practice as it will give you a much cleaner edge when you're done cutting. Make sure when measuring the openings in which the insulation will be getting installed into to allow for about 2-3mm or ¼ “ wider than required so you get a nice snug fit. The tighter the fit the less chance you have of air leakage and small gaps can be worse than big holes as small gaps can cause a rushing of air effect. This method of installation is also used when working on attic floors, crawlspaces, basements, and external walls.
Polystyrene board insulation would be one of the least efficient rigid board insulations today. However, all is not lost as EPS has a high compressive strength and is great for carparks or floors that are carrying a little more weight than usual. Also, EPS insulation would be widely used in passive housing for the foundations. Insulating the foundations is vital to achieve a passive house rating and EPS is an excellent cost-effective method of insulating your foundations and the good characteristics of strength, light and cheap makes EPS your best friend when insulating your foundations.
Expanded polystyrene board is easy to cut with a box knife or hand saw. EPS insulation does not have a foil attached to it so no need to score the insulation first before cutting it with a handsaw. Be careful however around any naked flames. Fire and EPS get on very well and EPS will burn and will billow out black smoke so if it does go up in flames stay away. Do not breathe in the black smoke. If you take all the usual precautions when using EPS it will perform extremely well and will continue to do so with no depletion in performance over the duration of the life cycle of the building. Other insulations cannot boast such amazing lifetime performance.
Much like EPS in its appearance XPS is the big daddy of EPS. A foam board insulation such as Pink insulation foam FOAMULAR 250 XPS is stronger, just as light and far exceeds the compressive strength of its EPS counterpart. XPS foam also gives a higher r-value but of course, with all these fantastic additions to the insulation, there is a price difference. XPS would be in the region of 20-30% more expensive than EPS. However, XPS would be more widely used in the commercial/industrial insulation sector where compressive strength is a real requirement. Once again XPS like the other rigid board insulations is easy to cut and lightweight. XPS and EPS are closed-cell insulation and will not lose their insulation values over time, unlike Polyiso insulation which will deplete over circa 30 year period.
So what are the brands or who are the manufacturers of foam insulation?
Polyiso: R-Max, Hunter, Owens Corning, Johns Manville, and Dow are just some of the biggest Poyiso brands in the US.
XPS: Pactiv, Dow, Johns Manville and Owens Corning all manufacture XPS insulation. Styrofoam insulation from Dow is one of the most recognizable sheet insulation on the market due to its famous blue color.
For more information, please visit XPS board manufacturing line.
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