Product Data Sheet Safety Data Sheet Show all documents

Sarnatherm® XPS tapered

Rigid extruded polystyrene insulation board

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

  • Low water absorption
Product Data Sheet Safety 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 XII, X, XIII, IV, 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

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

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

Type VIType VIIType V
40.0 psi (276 kPa)60.0 psi (414 kPa)100 psi (690 kPa)

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

Flexural Strength

Type VIType VIIType V
60.0 psi (414 kPa)75.0 psi (517 kPa)100 psi (690 kPa)

Minimum values

Dimensional Stability

Type VIType VIIType V
<2%<2%<2%

Thermal resistance

Type VIType VIIType V
5.05.05.0

Service Temperature

Maximum Use Temperature                                                                             

Type VI

Type VII

Type V

165°F (74°C)

165°F (74°C)165°F (74°C)

Water Absorption

Type VIType VIIType V
<0.3<0.3<0.3

Permeability to Water Vapor

Type VIType VIIType V
< 1.5 perm< 1.5 perm< 1.5 perm

*Water vapor permeance varies with product type and thickness. Values are based on the desiccant method and they apply to insulation 1" (25 mm) or greater in thickness

Reaction to Fire

Type VIType VIIType V
Oxygen Index Oxygen IndexOxygen Index
24.024.024.0

% by volume

Type VIType VIIType V
Flame spreadFlame spreadFlame spread
555

Type VIType VIIType V
Smoke DevelopedSmoke DevelopedSmoke Developed
165165165

*These values are not intended to reflect hazards presented by this or any other material under actual fire conditions

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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