Styrofoam sheets1/6/2024 ![]() Polyurethane and polyisocyanurate are both closed-cell foams. The foil facing also makes it very easy to seal with good quality foil faced tapes.Ĭost = Polyiso is the most expensive of the foam board insulation products however it’s the highest R value. The reflective foil facing makes it an excellent insulation board when radiant heat is involved. Polyiso is typically used with a foil facing and it has an R value of 7.0 to 8.0 per inch of thickness. Polyisocyanurate also known as polyiso is seen in all kinds of commercial building applications and more recently with residential building projects. This product is also used to insulate the outside of foundation walls and even under slabs.Ĭost = This product is the middle of the road for these types of foam board insulation products. It’s reasonably priced, light weight and easy to use. This is the product that I typically use to insulate basement walls. ![]() XPS has an R value of 4.5 to 5.0 per inch of thickness. This insulation board is probably one of the most widely used foam board insulation products in the residential construction industry. ![]() Extruded Polystyrene FoamĮxtruded polystyrene foam (XPS) also known as blue board or pink board comes in many different thicknesses and edge profiles. It is also sometimes used on commercial buildings for roof and wall panel insulation which is typically sandwiched between light gauge metal.Ĭost = Cheapest of the foam insulation boards. Expanded polystyrene insulation is similar to the foam used for packing “peanuts” and it’s typically used for insulated concrete forms also knows as ICF’s. This product typically has an R value of 3.6 to 4.0 per inch of thickness. Expanded Polystyrene FoamĮxpanded polystyrene foam (EPS) is the cheapest and least used foam board product on the market. I also recommend you read a recent article about Open Cell Vs Closed Cell Foam products to understand the differences between the two product types. DOW products has lots of information on their site about different foam board products here. They include expanded polystyrene, extruded polystyrene, and polyisocyanurate unfaced or foil faced. The basic types of foam board insulation include: polystyrene, polyurethane or polyisocyanurate. There are three basic foam insulation board products on the market produced under several different manufacturer names. Because of this I often get questions about which type of foam board insulation to use and what R values these products provide. I’ve written several posts about how to insulation basement walls in which I promote the use of foam board insulation as the first line of defense against moisture and mold.
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