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Stylite Perlite Roofing insulation board is expanded polystyrene insulation bonded to a perlite insulation board. Available in a plain board, bitumen covered board or tapered (cut to falls). The high density and fire resistant board can be used for both refurbishment and new build. Compatible with any new waterproofing layer.

The product is easily cut to form a tapered slope of a roof, this can be custom designed to specific requirements and dimensions. Utilizing a Perlite bonded tapered board allows control of the water drainage on the roofing system, whether it's new build or refurbishment to eliminate standing water.

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.
  • Resists heavy foot traffic.
  • Bituminous, PVC and asphalt compatible.
  • Lightweight and applicable to any wall substrate.
  • Quick and easy installation on single ply/ felt, ballasted or green roofs.
  • 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+ (Plustherm).
  • CE marked.

Related literature

The following content references this product:

Standard product features

Size (l x w):

600 x 1200 mm.


Plain edge.

Compressive strength:

- At 10% to EN 826:

  • Perlite board: <300 kPa.
  • Plustherm: 100 kPa.
  • SD-VB-FRA: 70 kPa.

- At 1% to EN 13163:

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

Thermal conductivity (Lambda 90/90) to EN 13163/ 13169:

  • Perlite board: 0.050 W/m·K.
  • Plustherm: 0.030 W/m·K.
  • SD-VB-FRA: 0.038 W/m·K.

Reaction to fire to EN 13051-1:

  • Perlite board: C-s1,d0.
  • Plustherm: Euro class E.
  • SD-VB-FRA: Euro class F.

Bending strength to EN 12089:

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

Water absorption to EN 13163/ 13169:

  • Perlite board: <0.07 (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/ 1604:

  • Perlite board: <0.5/ 1.0.
  • Plustherm: DS (N) 5.
  • SD-VB-FRA: DS (N) 5.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-45-65/380 Expanded polystyrene (EPS) board
45-45-50/340 Expanded perlite board

Product specification

An important note about specifying



Styrene Packaging & Insulation


+44 (0)1274 691777

Product reference

Perlite Bonded Roofing Insulation Board


[Perlite board, plain]
[Perlite board, bitumen covered]
[Perlite board, tapered]
Insert requirements.


[ ______ ]

Manufacturer details

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