Home > Companies > Styrene Packaging & Insulation > External Wall Insulation Railboard

Stylite EWI rail boards are for use with all external wall applications, both domestic and industrial, to satisfy current Building Regulations. Often utilized with NHBC compliant build applications using lightweight frame walls with a 15 mm drainage and ventilation cavity. It is a quick and effective way to increase the thermal performance of any building and can be applied with almost any render or cladding system to produce a full EWI system. Suitable for fast construction of new builds, however are also used to upgrade existing buildings.

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.
  • With rail system edge profile.
  • Lightweight and applicable to any rail system.
  • Quick and easy installation.
  • Minimal water absorption and 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):

500 x 500 mm.

Compressive strength:

- At 10% to EN 826:

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

- At 1% to EN 13163:

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

Tensile strength to EN 1607:

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

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

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

Reaction to fire to EN 13051-1:

Euro class E.

Bending strength to EN 12089:

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

Water absorption to EN 13163:

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

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

NBS Specification

NBS Buliding logo
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

External Wall Insulation Railboard




[ ______ ]

Manufacturer details

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