Rigid Foam insulation is usually made with one of these three materials: molded expanded polystyrene (MEPS), extruded expanded polystyrene (XEPS) or polyurethane. Rigid Foam is installed as a liquid while other varieties come as factory pre-made panels called rigid foam boards. This insulation is very effective in buildings where there are space limitations and where high R-values are needed. Foam insulation R-values usually range from R-4 to R-6.5 per inch of thickness, which is up to two times greater than other insulating materials of the same thickness. Rigid foam insulation is usually found only in high-end custom homes, where would be cost-prohibitive to hire people to spray foam in site-built homes.
Rigid foam insulation is best used in the crawl space insulation of interior walls. This kind of insulation is also commonly used for exterior and foundation applications. Foam class insulation has a top-rated value when it is installed correctly, especially when compared with other types of home insulation. Rigid foam insulation comes in a fixed form of rigid panels directly to the framing, where it is actually made from sheets of polystyrene and can be applied to the interior or exterior part of the wall.
Rigid foam insulation is ideal for very hot or very cold climates, and because it is suitable for use on the exterior side of metal framing, the thermal insulation of the wall is not limited by the depth of the stud. This insulation is typically used to insulate foundations and slabs, and it also is applied on exterior roofs and walls, and may substitute for loose-fill , roofs and floor cavities, however it must be tightly fitted to prevent air infiltration. This insulation is applied on the surface of the wall, and all other insulation is installed in the wall cavity.
Rigid foam insulation is also easy to install with nails or glue, but its cost per unit R is much higher than that of fiber. Although the price can be generally higher than fiber insulations, rigid foam works well in places where higher R-values are necessary, particularly in small spaces. This insulation is also usually applied when a new basement is being constructed, where it is placed on the outside of the concrete or cement foundation.
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