• Low cost per R-value
  • Superior dimensional stability
  • Resistant to moisture
View Technical Data

Geofoam Projects

Finally, A Choice In Direct-to-Deck Roof Insulation

Adding a thermal barrier adds time and materials which increases cost. STYRO-STOP expanded polystyrene (EPS) roof insulation can be applied directly over steel roof decks without a thermal barrier.

Enjoy the benefits of permanent high R-values, superior dimensional stability, and resistance to moisture absorption and physical degradation at a substantial cost savings over other rigid insulation products.

Available in flat, tapered or compound tapered panels ranging from 1.00 – 2.00 pcf, STYRO-STOP is compatible with all major roofing materials and assemblies. It has also been thoroughly evaluated for fire safety performance. STYRO-STOP provides building owners, architectural specifiers and contractors the confidence that comes from its recognition by the nation’s most respected code authorities.

STYRO-STOP Direct-To-Deck Recognition

STYRO-STOP has undergone thorough evaluation by ICC-ES and UL for fire safety performance and can be installed directly over steel roof decks.

UL Evaluation Report ER13418 and UL Roof Deck Construction No. 458 recognize STYRO-STOP up to 10” being installed directly over steel roof decks along with a Class A, B or C roof covering of 80 mils or less in ballasted, mechanically fastened and fully-adhered roof assemblies.

Direct-To-Deck Assemblies

Steel Deck: Minimum 22 gauge, 1/2” deep, non-perforated, and maximum 6” flutes.

EPS Thickness: Refer to UL ER13418 or UL Roof Deck Construction No. 458 for various thickness and Types.

Accepted Membranes: Approved EPDM or thermoplastic single-ply that are ballasted, mechanically fastened and fully-adhered.

Cover Board (when required): Refer to UL Roof Deck Construction No. 458 for various cover board options.

For complete assembly information, refer to UL Roof Deck Construction No. 458 or UL Evaluation Report ER13418.

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Discover The Benefits Of STYRO-STOP Insulation

  • The lowest cost per R-Value of any rigid insulation board provides high insulating values that will not diminish over time.
  • Superior dimensional stability helps assure that your roof insulation system remains tight and energy-efficient, and your membrane fully supported.
  • Resistant to the effects of moisture, yet it breathes, is not a vapor barrier and needs no venting.
  • Compressive strengths ranging from 10 – 25 psi that can accommodate specific roof traffic and loads without deforming.
  • Sizes that offer more slope and dimension options than other insulations.
  • Independent test reports document superior in-situ performance in a wide variety of roof applications.

Product Specifications

7220 - Roof Deck Insulation: STYRO-STOP is available in tapered and flat panels and in a variety of slopes. Ideal for use in ballasted, mechanically fastened and fully-adhered roof assemblies.

Roof Assembly

Mechanically Fastened
Roof Assembly

Roof Assembly
Factory fabricated hip and valley panels eliminate time consuming field fabrication of mitered corners.

Product Dimensions

STYRO-STOP is available in a range of sizes to meet your specific application:
Thickness: Maximum insulation thickness varies per assembly and material density.
Width: 24 inches – 48 inches
Length: 48 inches – 96 inches

Environmental Assurance

STYRO-STOP does not contain ozone-depleting CFCs or HCFCs.

Technical Data

Styro-Flex Design Considerations

Styro-Flex Physical Properties ASTM C578

Styro-Flex Safety Data Sheet

UL Evaluation Report ER 13418

UL Flame Spread and Smoke Developed Data

UL Roof Deck Construction No. 458