EWI-450 XPS Insulation – 50mm (1m2)

£10.22 (incl VAT)

In stock (can be backordered)

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Extruded Polystyrene XPS is a modern insulating material with fantastic thermal properties, good moisture resistance and high strength. This extruded polystyrene (XPS) board is a high density board that can be used for various applications on buildings, including DPC insulation, extending concrete windowsills or providing insulation backing where EPS is not suitable to use. The material has a smooth closed-cell surface ready for use.

These XPS boards can be used on timber, masonry and system build properties, as well as for tile hanging and as the base for a wide range of rendering systems.

  • Closed-cell
  • Reduces the risk of water penetration
  • Compact and robust

Technical Specifications:

Composition: extruded polystyrene, silver boards

Thermal Conductivity: 0.031W/(m2K)

Reaction to Fire: Class F

Size of boards: 1000mm by 500mm

Coverage in pack: 1m2 (2 boards per pack)


Use a protection mat to prepare the property ready to apply the insulation to the DPC.

Try to use a hot knife or hot wire cutters to minimise excess residue of the boards.


The XPS insulation boards should be installed in accordance with a project plan or a brief prepared by the architect. The boards if being applied to the area below the DPC or if being used to attach to the substrate should be glued on with a quick drying mortal or adhesive (see EWI-220 EPS Basecoat).

After having been fixed to the area below the DPC or on the sills (when left to dry) the work area should be covered sufficiently to prevent water penetration or exposure to UV light.

When set and ready apply the basecoat or mortar ready to sink in the fibre glass mesh. Once this has been installed, the substrate is ready for the application of the top coat.


Easy to sweep up or can use industrial hoover for suction of residue


Multiple boards in a pack

50mm board – coverage 1m2 (2 boards per pack).


Shelf life: please see the manufacturers date of expiry. Keep in a dry place, in the original undamaged packaging, avoid excess heat or UV light exposure.

Safety Measures:

Wear eye protection, gloves and a mask. Take extra caution when using cutting equipment.

Compliance with Standards:

The product complies with the harmonized standard EN 13164:2013

SKU: EWI-450-50
Weight 35 kg


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