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Stylite Partial Fill Cavity Wall Insulation is designed to be incorporated into a cavity of a new build masonry wall. The partial fill boards are designed to minimize any water penetration, protecting the inner leaf of the building, while providing high performance thermal properties. The added foil-face provides thermal radiation reflection, which is equivalent to an extra 20 mm of Stylite Plustherm. It also creates a watertight layer over the insulation which is sealed at joints.

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.
  • Tongue and groove or plain profiled edges.
  • Reduces cold bridging.
  • Lightweight.
  • Quick and easy installation.
  • Used in commercial and residential projects.
  • 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.

Related literature

The following content references this product:

Standard product features

Size (l x w):

1200 x 450 mm.

Compressive strength:

- At 10% to EN 826:

  • EPS 70: 70 kPa.
  • Plustherm: 100 kPa.
  • SD-VB-FRA: 70 kPa.

- At 1% to EN 13163:

  • EPS 70: 21 kPa.
  • Plustherm: 30 kPa.
  • SD-VB-FRA: 21 kPa.

Tensile strength to EN 1607:

  • EPS 70: TR100.
  • Plustherm: TR150.
  • SD-VB-FRA: TR100.

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

  • EPS 70: 0.038 W/m·K.
  • Plustherm: 0.030 W/m·K.
  • SD-VB-FRA: 0.038 W/m·K.

Reaction to fire to EN 13051-1:

  • EPS 70: Euro class F.
  • Plustherm: Euro class E.
  • SD-VB-FRA: Euro class E.

Bending strength to EN 12089:

  • EPS 70: 115 kPa.
  • Plustherm: 150 kPa.
  • SD-VB-FRA: 115 kPa.

Water absorption to EN 13163:

  • EPS 70: 0.015–0.030 (mg Pa-1 h-1 m-1).
  • Plustherm: 0.009–0.020 (mg Pa-1 h-1 m-1).
  • SD-VB-FRA: 0.015–0.030 (mg Pa-1 h-1 m-1).

Dimensional stability to EN 1603:

DS (N) 5.



More grades available upon request; consult manufacturer for details.

NBS Specification

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This product is associated with the following NBS Create clause:
45-45-65/380 Expanded polystyrene (EPS) board

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

Partial Fill Cavity Insulation Board


[EPS 70]


[ ______ ]


[Tongue and groove]

Manufacturer details

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