Product Data Sheet Safety Data Sheet Show all documents
Sarnatherm® EPS tapered

Sarnatherm® EPS tapered

Rigid expanded polystyrene insulation board

Sarnatherm EPS is a sloped, rigid expanded polystyrene insulation board. Sarnatherm EPS  is installed directly on the substrate (depending on local code or FM requirements), over an approved thermal barrier, or directly on the existing roof surface prior to the application of the Sarnafil® membrane or Sikaplan® membrane.

  • Manufactured with no CFCs or HCFCs
  • Virtually no GWP (Global Warming Potential)
  • Zero ODP (Ozone Depletion Potential)
  • Recognized as resistant to mold growth
Product Data Sheet Safety Data Sheet Show all documents

Usage

Wherever insulation is required within a conventional roof assembly.    AREAS OF APPLICATION   
  • New Roofs
  • Recover Roofs
  • Mechanically Attached Systems
  • Adhered Systems
 

Advantages

  • Manufactured with no CFCs or HCFCs
  • Virtually no GWP (Global Warming Potential)
  • Zero ODP (Ozone Depletion Potential)
  • Recognized as resistant to mold growth

Packaging

  • 4 ft x 4 ft (1.2 m x 1.2 m)
  • Various Thicknesses

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

  • ASTM C 578 Type II (20 psi)
  • UL 1256, 790, 263
  • FM 4450, 4470
  • Miami‐Dade County
  • State of Florida
 
Product Information

Chemical Base

Polystyrene Foam Core

Shelf Life

N/A

Storage Conditions

When stored outdoors, the insulation should be stacked on pallets at least 4” (102 mm) above the surface level and protected from exposure to direct sunlight and weather using an opaque, light-colored tarpaulin. Do not use a dark colored tarpaulin. The factory applied packaging is intended only for protection during transit and should only be slit enough to prevent accumulation of condensation then removed prior to immediate use. Insulation that becomes wet or damaged should be removed and replaced with dry insulation.

Density

Type VIIIType IIType IX

Nominal

1.25 psf

1.5 psf2.0 psf

Minimum

1.15 psf1.35 psf1.8 psf
Technical Information

Compressive Strength

Type VIIIType IIType IX
13.0 psi (90 kPa)15.0 psi (104 kPa)25.0 psi (173 kPa)

Minimum values at yield or 10 % deformation, whichever occurs first.

Flexural Strength

Type VIIIType IIType IX
30 psi (208 kPa)35 psi (240 kPa)50 psi (345 kPa)

Minimum values

Dimensional Stability

Type VIIIType IIType IX
2%2%2%

Maximum values

Thermal Conductivity

C-value per inch, BTU/hr.ft2.°F


Type VIII

@25°F (-4°C)@40°F (5°C)@75°F (24°C)

0.22

0.24

0.26

 

Type II

@25°F (-4°C)@40°F (5°C)@75°F (24°C)

0.21

0.22

0.24

  

Type IX

@25°F (-4°C)@40°F (5°C)@75°F (24°C)

0.20

0.21

0.23

Thermal resistance

 R-value per inch, hr.ft2.°F/BTU

  

Type VIII

@25°F (-4°C)@40°F (5°C)@75°F (24°C)

4.5

4.3

3.9

Type II

@25°F (-4°C)@40°F (5°C)@75°F (24°C)

4.8

4.6

4.2

 Type IX

@25°F (-4°C)@40°F (5°C)@75°F (24°C)

5.0

4.8

4.4

Service Temperature

Maximum Use Temperature                                                                             

Type VIII

Type II

Type IX

165°F (74°C)

165°F (74°C)165°F (74°C)

  

Water Absorption

Type VIIIType IIType IX
332

Maximum values,% by volume

Permeability to Water Vapor

Type VIIIType IIType IX
3.5 perm3.5 perm2.5 perm

Maximum values, 1" thickness

Reaction to Fire

Oxygen index: 

Type VIIIType IIType IX
24.024.024.0

  

(ASTM D-2863)

Minimum Values, % by volume

  

Flame spread:

Type VIIIType IIType IX
252525

  

(ASTM E-84)

Maximum values

  

Smoke development:

Type VIIIType IIType IX
450450450

  

(ASTM E-84)

Maximum values

Application

Application steps

APPLICATION INSTRUCTIONS

Sarnatherm EPS is installed by a Sarnafil Authorized Applicator. Sarnatherm EPS may be installed either by mechanical‐attachment to the roof deck with Sarnafasteners and Sarnaplates, by full attachment with low rise sprayed urethane foam or partial attachment with foam adhesive (options depend on deck type and Sarnafil system to be installed). Contact Sika Corporation – Roofing Technical Department regarding alternative methods of attachment.

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