• 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.

UL Roof Deck Construction No. 458 UL Roof Deck Construction No. 458
(143 KB)

UL Evaluation Report ER 13418 UL Evaluation Report ER 13418
(61 KB)

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.


Ballasted
Roof Assembly

Mechanically Fastened
Roof Assembly

Fully-Adhered
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 Design Considerations
(90 KB)

Styro-Flex Physical Properties ASTM C578 Styro-Flex Physical Properties ASTM C578
(85 KB)

Styro-Flex Safety Data Sheet Styro-Flex Safety Data Sheet
(603 KB)

UL Evaluation Report ER 13418 UL Evaluation Report ER 13418
(61 KB)

UL Flame Spread and Smoke Developed Data UL Flame Spread and Smoke Developed Data
(92 KB)

UL Roof Deck Construction No. 458 UL Roof Deck Construction No. 458
(143 KB)