Product Data Sheet Show all documents

Sarnatherm® XPS tapered

Sarnatherm XPS is a rigid extruded polystyrene insulation board

Sarnatherm® XPS tapered is a rigid extruded polystyrene insulation board that can be used in either a Sika roofing or waterproofing application.

  • Low water absorption
Product Data Sheet Show all documents

Usage

Wherever insulation is required within a conventional roof assembly and waterproofing systems.    Areas of Application
  • New Roofs
  • Recover Roofs
  • Mechanically Attached Systems
  • Adhered Systems
  • Waterproofing Systems
 

Advantages

  • Low water absorption

Packaging

  • Various Thicknesses
  • Sarnatherm per bundle depends on thickness

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

  • ASTM C 578, Type VI, VII, V
  • CAN/ULC S701, Type 4
 
Product Information

Chemical Base

Polystyrene foam core with a smooth skin surface on the face and back surfaces

Shelf Life

N/A

Storage Conditions

Factory‐applied packaging is intended only for protection during transit. When stored outdoors or on the job site, the insulation should be stacked on pallets at least 4" (102 mm) above ground level and completely covered with a weatherproof covering such as a tarpaulin. The temporary factory‐applied packaging should be slit or removed to prevent accumulation of condensation. Refer to PIMA Technical Bulletin 109: Storage and Handling Recommendations for Polyiso Roof Insulation.

Thickness

Thermal Data*

Thickness

R-Value

C-Value

1.0" (25 mm)5.00.200
1.5" (38 mm)7.50.133
2.0" (51 mm)10.00.100
2.5" (64 mm)12.50.080
3.0" (76 mm)15.00.067
4.0" (102 mm)20.00.050

*Not all available thicknesses are listed.
Technical Information

Compressive Strength

40 psi (275 kPa)

(ASTM D-1621)

Flexural Strength

60 psi (480 kPa)

(ASTM C-203)

Dimensional Stability

1.5 %

(ASTM D-2126)

3.5 x 10‐5 in/(in∙°F) (6.3 x 10‐2 mm/(m∙°C))

Reaction to Fire

Flame Spread1: 5

Smoke Developed: 165

(ASTM E-84)

1 This numerical flame spread rating is not intended to reflect hazards presented by this or any other material under actual fire conditions.

Permeability to Water Vapor

1.5 perm (90 ng/(Pa∙s∙m2))

(ASTM E-96)

Water Absorption

0.1 %

(ASTM C-272)

Service Temperature

165°F (74°C)

Application

Application steps

APPLICATION INSTRUCTIONS

Sarnatherm® XPS tapered is installed either under or over the Sika roofing/waterproofing membrane depending on the system design. Overburden is utilized to hold the insulation in place in a waterproofing application. Polystyrene should not come in contact with PVC. Always place a separation layer such as Sarnafelt NWP between the Sarnatherm® XPS tapered and the membrane in both roofing and waterproofing applications. During installation in hot, sunny weather, protect the insulation with a white covering to prevent excessive heat build‐up and potential warping of the insulation boards.

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