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Stylite Cavity Wall Bead Insulation is combined with a bonding agent to help the Expanded Polystyrene (EPS) to adhere to the shape of the cavity. It can be utilized in both new build and refurbishment projects. The hydrophobic and closed cell properties of EPS make it an ideal loose blown insulation for cavities as it won't hold water. As cavity insulation, it is cost effective both in material costs and time scales.

Expanded polystyrene is compatible with most chemicals and materials. It is rot proof and durable, and will remain effective as an insulation for the life of the construction; it is not affected by bacteria, moulds or fungi and will not provide nutrient value for insects or vermin.

Features and benefits:

  • Lambda from 0.030 W/m·K.
  • Available in grey or white bead.
  • Enhanced performance and reduces cold bridging.
  • Lightweight.
  • Quick and easy installation.
  • Used on commercial and residential projects.
  • No water absorption.
  • Minimal water permeability.
  • 100% recyclable.
  • No HFC’s, CFC’s or HCFC’s.
  • Global Warming Potential (GWP) and an Ozone Depletion Potential (ODP) of zero.
  • BRE green guide rating: A+.
  • CE marked.

Standard product features

Thermal conductivity (Lambda 90/90) to EN 13163:

  • Plustherm: 0.033 W/m·K.
  • White: 0.040 W/m·K.

Reaction to fire to EN 13051-1:

Euro class E.

Water absorption to EN 13163:

  • Plustherm: 0.009–0.020 (mg Pa-1 h-1 m-1).
  • White: 0.015–0.030 (mg Pa-1 h-1 m-1).



20 < 300 mm.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-55-45/320 Expanded polystyrene (EPS) bead insulation

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Styrene Packaging & Insulation


+44 (0)1274 691777

Product reference

Wall Bead Cavity Insulation




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Manufacturer details

Morley Carr Road,
Low Moor,
West Yorkshire, BD12 0RA
Tel +44 (0)1274 691777
Fax +44 (0)1274 693832
NBS Plus