Extruded polystyrene (XPS)

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Extruded polystyrene (XPS) is manufactured by combining polystyrene with a blowing agent under pressure. The release of pressure forces the material to expand into a foam, it is then shaped, cooled and cut to the desired specifications.

XPS should not be confused with EPS (expanded polystyrene)

Applications for XPS include wall, roof and floor insulation. XPS is particularly suitable for use below ground or for instances with additional loading requirements.


Floors and roofs


Closed cell rigid insulation
Low thermal conductivity
High strength and durability

PIR = Superior thermal performance

Because of its superior thermal performance PIR insulation offers optimal insulation value meaning a thinner layer will achieve the same insulation properties.  This has other benefits, as using thicker insulation will mean a larger building footprint or smaller internal dimensions for a property.

The diagram shows the typical thicknesses of different wall insulation materials needed to achieve an R value of 4.5.