SarnaTherm XPS

Extruded polystyrene CFC and HCFC free thermoset cellular plastic insulant, with a rigid closed cell structure.

SarnaTherm XPS is manufactured to BS EN 13164 'Thermal Insulation products for buildings - factory made extruded polystyrene foam (XPS)'.

General information

Uniclass 2015

Pr_25_71_63_29 Extruded polystyrene (XPS) boardsPrimary


J42/10 Warm deck roof covering

J42/415 Extruded polystyrene (XPS) warm deck roof insulation

J42/440 Inverted roof insulation

Specification data - Extruded polystyrene (XPS) boards

Product Reference

SarnaTherm XPS

Standard product features


  • Thermal conductivity: 0.029W/m2K (thicknesses < 120mm).
  • 0.031W/m2K (thicknesses > 120mm).
  • CFC/ HCFC free.
  • Zero ODP (Ozone Depletion Potential).
  • Typical Density of 33 kg/m³.
  • Compressive strength 300-500 kPa at 10% deformation.
  • Withstands freeze/ thaw cycling.
  • Closed cell structure minimises water absorption.

Product Options

Product reference:

SarnaTherm XPS: Unfaced extruded polystyrene insulation, suitable for use in mechanically fastened, adhered, warm ballasted, inverted ballasted and green roofing systems.


Consult Sika Sarnafil for recommendations and details.

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