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EPS is a good insulator because its R-value stays consistent with no help from harmful chemical blowing agents. Depending on the density of the foam the R-value is usually around 4-R/inch. See Chart

Expanded Polystyrene rigid insulation is the best value on the market. EPS has the Lowest Cost/Published R-Value Inch. It becomes an even better value, when compared against other insulation over time that drop in R-value, where EPS stays very consistent. Read More

In field studies, EPS has been shown to absorb less moisture than previous considered. In Fact, EPS absorbed only 1/2 of a percent (.005) over 15 years in a below grade field study. Expanded Polystyrene has the great property of allowing moisture to expel out. EPS insulation exhibited drying potential under severe exposure conditions while other insulations like XPS, when exposed to the same conditions, did not. Read More

EPS has a variety of compressive strengths based on its density. This density is measured in the amount of EPS beads that are used in a cubic foot of finished product which are categorized into “Types.” . Compressive strengths can vary from 720 lbs. per sq. foot to 8,640 lbs. per sq. foot. See Chart

EPS does contain a flame retardant which help increase its resistance to fire. At 212 deg. F, EPS will begin to soften and finally melt. Although at lower temperature EPS is relatively hard to ignite. EPS does contain a fire retardant but yet is considered combustible and should not be exposed to direct flame and in certain construction applications does require a covering of a fire barrier material. Learn More

Unlike other rigid insulations, EPS does not suffer from thermal drift. EPS’s R-value stays consistent providing a huge financial benefit for years. When one pays more for a “higher R-value” rigid insulation and it losses much of its thermal residence over time, we do not believe that offers a good insulation investment or value. See Chart

Similar to aluminum can, EPS can be recycled. In fact, in 2013 - over 34% of post consumer EPS was recycled. Learn More

EPS is used in many application below grade or in/under soil. EPS does not leach harmful chemicals into the soil. In fact, when EPS is not recycled, many consider it to be very “Landfill Safe.” EPS actually helps the landfill by aerating the soil.

EPS is a closed cell foam which does not contain any ozone depleting CFCs (chlorofluorocarbons) or HCFCs (hydrochlorofluorocarbons) chemicals, asbestos or other harmful fibers.

EPS does not support a food source for molds to grow which in turn make it “mold resistant.” In fact ESP has been test to ASTM C1338 for “Fungi Resistance of Insulation Materials” and results show no mold growth over a test period time. See Report

EPS does have the advantage of being inert which means that it does undergo any biological, chemical, physical or radiological transformation. Unlike other materials that off-gas chemicals, EPS is inert.

Many insulations are limited to certain sizes like 4’ x 8’ or thickness of 4” thick. Plymouth Foam EPS can be made up to 18’ long and 48” thick. See Custom Sizes

Plymouth Foam EPS can manufacturing and fabrication dynamically foam to be used in many applications. EPS can be shaped to a certain size. It can be molded to exact part size. It can be glued with other EPS or materials. It can be melted to provide a void.

Sound deadening sound reduction occurs as a product of system design. EPS has effective properties when used with other products to reduce sound transmission. Three inch EPS insulation with two sided 1/4” drywall in a wall system can reduce sound transmission to approximately 36 DB. More Info STC Ratings and ASTM E-90

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