Building Insulation Products Plain EPS Insulation

Flat Sheets

Cellofoam plain expanded polystyrene (EPS) foam insulation significantly reduces energy costs by adding R-value to building walls and roofs. Cellofoam unlaminated EPS insulation is made of premium expanded polystyrene rigid insulation that meets or exceeds the requirements of ASTM C578, Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation. The EPS is composed of closed cells with excellent dimensional stability, compressive strength, and water resistance. EPS provides an excellent thermal savings per dollar cost. Composed of about 98% air, it has minimal weight, is easy to handle and install, and is UL approved.

stack of EPS foam insulation
Large Flat sheets of EPS Foam insulation shown in bags with Cellofoam logo on flatbed truck

Roofing Applications

Cellofoam plain, unlaminated, flat EPS insulation is generally used with an appropriate fire retarding cover board or overlay, such as Cellofoam’s FR Composite sheet, and may also serve as a leveling board for roofing re-cover jobs. In many cases, this insulation can provide contractors with significant cost savings versus commonly used Polyiso insulation, either as a direct replacement or in a hybrid EPS / Polyiso system under single-ply roof systems. Our plain, flat EPS insulation is UL classified TGFU.R7260 for fully adhered ballasted, and mechanically attached assemblies.


Cost Savings

EPS reduces energy costs and offers the highest R-value per dollar of any foam insulation board. It is lightweight and easy to install.

Code Approvals

Underwriters Laboratory Listed, UL ER7260, for interior and exterior walls. UL classified TGFU.R7260 for fully adhered ballasted, and mechanically attached roofing assemblies. Please consult local building codes for system requirements.

Stable R-value

The R-value of EPS is permanent because the only gas in EPS is air. Unlike Polyiso or XPS whose blowing agents outgas and therefore lose R-value, EPS R-values do not degrade over decades of use.

Moisture Resistant

Cellofoam EPS is quick drying and does not readily absorb moisture from the air. Its closed-cell structure reduces the absorption and migration of moisture; not a vapor barrier.

Premium Quality

Meets or exceeds ASTM C578 specs, with excellent dimensional stability & compressive strength. When properly installed it does not deteriorate with age, and is resistant to mildew, rot, fungus, and bacteria.

Environmentally Friendly

Cellofoam EPS contains no formaldehyde or ozone-depleting CFCs or HCFCs. It is 100% recyclable and may contain recycled material.

Manufactured to your Needs

Cellofoam plain, flat EPS insulation is available in a wide variety of board sizes, thicknesses of ½ - 6 inches, ASTM C578 nominal densities of 1.0, 1.25, 1.5, 2.0, 2.5, and 3.0 lb/ft3, and compressive strengths of 10 - 60 psi.


Protect your product. Protect your brand. Protect what matters most with Cellofoam

We’re dedicated to manufacturing products that meet the highest standards of quality and performance. Need to know if Cellofoam’s products are right for your next project? Reach out to our team.