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Eurothane® Silver is a high performance rigid polyisocyanurate (PIR) foam board for use in warm flat roofs under mechanically fixed single-ply membrane waterproofing systems. It is a closed cell, CFC and HCFC-free (zero ozone depletion) rigid polyisocyanurate foam core, faced on both sides with a multi-layer coated aluminium foil. It has an exceptionally low thermal conductivity of 0.023 W/mK.

Features/ benefits:

  • Will assist in meeting the appropriate Building Regulation standard with any form of warm flat roof construction.
  • Outstanding product quality manufactured to ISO 9001 Quality Systems. All products carry the CE mark to show compliance with the harmonized European Standard BS EN 13165.
  • Zero ozone depletion potential.
  • All Recticel products have a global warming potential of below 5.
  • The declared thermal conductivity value of 0.023 W/mK is some 30% more efficient than most other insulation materials.
  • Eurothane® Silver has Factory Mutual (FM) approval. It achieves a Class 1 rating in approved FM systems. Eurothane Silver has LPCB LPS 1181 approval.
  • Fully compatible with most synthetic (PVC, EPDM) and bitumen based single-ply membrane waterproofing systems.
  • No requirement for roof ventilation and inherently safe from harmful interstitial condensation.
  • Condensation within the roof structure is avoided as it is maintained at the same temperature as the inside of the building.

Standard product features

Size (board):

2500 x 1200 mm.

Specific heat capacity:

1.4 kJ/kgK.



Other sizes available on request: Eurothane® Silver insulation is also available as a tapered board through specialist single layer tapered insulation division Gradient Insulation Limited.

Waterproofing systems:

Eurothane® Silver boards are compatible with most mechanically fixed and loose-laid and ballasted synthetic (PVC, EPDM) and bitumen-based single-ply membrane waterproofing systems.

- Condensation:

The requirement for a vapour control layer must be assessed with reference to BS 5250 and BS 6229. If required, a minimum 1000g polythene sheet should be used.

- Roof loading:

Eurothane® Silver boards are suitable for loads associated with the pedestrian maintenance traffic on the roof; for areas of heavier pedestrian traffic extra precautions should be taken such as the use of specially designed walkways (consult the membrane manufacturer for specific details). Care must be taken to avoid damage to boards by impact or by concentrated loads during installation. When using ballasted systems the roof structure must be designed to accept the additional dead load, minimum 80 kg/m².

- Roof drainage:

To ensure adequate drainage the roof should have a minimum finished fall of 1:80. This may mean designing for twice the minimum finished fall to account for building inaccuracies, roof deflection and building settlement.

- Thermal bridging:

With increasing levels of insulation it is vitally important to ensure continuity of the insulation at the junction of elements. At the junction of the roof and the wall packing the eaves with compressible insulation will both prevent thermal bridging and close the cavity. At upstands and parapets the cavity wall insulation should be continued above the level of the roof to ensure continuity of the wall and roof insulation.

- Wind uplift:

The wind uplift force exerted on the roof will vary according to geographical location, site location and building height. Reference should be made to BS 6399 and the membrane manufacturer’s recommendations for the number of fixings and the fixing pattern.

- Fire performance:

The fire performance depends upon the choice of waterproofing system. Generally, an external fire rating of FAB will be achieved with mechanically fixed systems, whilst ballasted systems are deemed to achieve a fire rating of FAA. Eurothane® Silver is FM Approved to FM standard 4450. The board achieves a Class 1 rating in these full scale fire tests – a performance comparable to that of mineral fibre. Has LPCB LPS 1181 approval.

Reaction to fire:

  • Euroclass F (BS EN 13501-1).
  • Class 1 (BS 476-7).
  • FM Approval Class 1 (FM Standard 4450).
  • LPCB LPS 1181 approval.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-45-65/430 Polyisocyanurate (PIR) foam board

NBS Specification

NBS Buliding logo
This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Recticel Insulation


+44 (0)1782 590470

Product reference

Eurothane® Silver


[30 mm]
[40 mm]
[50 mm]
[60 mm]
[70 mm]
[80 mm]
[90 mm]
[100 mm]
[110 mm]
[120 mm]
[130 mm]
[140 mm]
[150 mm]

Manufacturer details

Enterprise Way,
Meir Park,
Staffordshire, ST3 7UN
Tel +44 (0)1782 590470
Fax +44 (0)1782 590497
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