Home > Companies > IKO PLC > Supertherm Plus Insulation

A CFC/ HCFC free, rigid polyisocyanurate foam insulation board, with a factory bonded 20 mm cork facing on the upper surface, and a glass tissue facing to the reverse.

Supertherm Plus is suitable for use beneath fully bitumen bonded reinforced bitumen membranes, and standard and polymer-modified mastic asphalt. The closed-cell foam core has a thermal conductivity of 0.027 W/mK and easily achieves required U-values with a minimum thickness, whilst the cork facing provides stability and a bonding surface.

Supertherm Plus is available in tapered format to improve roof drainage and a range of standard thicknesses to suit varying U-value requirements.


  • Totally CFC/ HCFC free (Zero Ozone Depletion).
  • Fire performance polyisocyanurate foam core.
  • For use with polymer modified or standard mastic asphalt, and fully-bonded reinforced bitumen membranes.
  • Industry standard PIR/ cork composite roofing board.
  • Full range of thicknesses to meet appropriate Building Regulations.
  • Lightweight and easy to handle.
  • Manufactured under quality assurance scheme BS ISO 9000: 2000.
  • High insulation value (PIR foam - aged thermal conductivity 0.027 W/mK).
  • Durable and maintenance free.

The product can be incorporated into a high performance waterproofing system, which if installed by a Permanite approved or registered contractor can be offered with a guarantee covering materials and workmanship for up to 20 years, depending on specification.


Boards should be laid with the cork face up on a suitable vapour control layer, and bonded with hot bitumen (optimum temperature 240°C) or adhesive, or mechanically fixed.

Standard product features

Board size:

1200 x 600 mm.

Compressive strength:

150 kPa.

Cork thickness:

20 mm.


  • Cork: 104–120 kg/m³.
  • Foam: 32 kg/m³.


Composite cork overlay with glass tissue to underside.



Other thicknesses and tapered schemes are available to order.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-20-00/320 Mastic asphalt (MA)

Product specification

An important note about specifying





+44 (0)1257 255 771

Product reference

Supertherm Plus Insulation


[50 mm]
[90 mm]
[100 mm]
[120 mm]
[___ mm]
[As drawing ___]
[Tapered as drawing ___]

Manufacturer details

Appley Lane North,
Appley Bridge,
Lancashire, WN6 9AB
Tel +44 (0)1257 255 771
Fax +44 (0)1257 252 514
NBS Plus
NBS National BIM Library