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Powerdeck® U - Insulation

Verified by manufacturer 5 months ago

150 mm

Recticel Insulation Variant:

Rigid PIR insulation for warm flat roofs under torch-on waterproofing systems.

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For use in warm flat roofs under bituminous torch-on waterproofing systems.


Powerdeck® U is a high performance rigid polyisocyanurate (PIR) foam board for use in warm flat roofs under bituminous torch-on waterproofing systems. It is faced with a bitumen glass fleece on both sides.

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. Powerdeck® U boards are also available for tapered insulation schemes.

Thermal bridging

With increasing levels of insulation it is important to ensure the continuity of insulation at the junction of elements.

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 6229 for adequate bonding of the vapour control layer to the deck. Calculations relating to the bonding of the insulation and any supplementary fixings should be made with reference to BS 6399.

Features and benefits:

  • Manufactured to ISO 9001 Quality and ISO 14001 Environmental Management Systems.
  • Manufactured using a blowing agent with zero ozone depletion potential (ODP) and low global warming potential (GWP).
  • Thermal conductivity as low as 0.024 W/m·K (depending on thickness).
  • Available in tapered format to assist roof drainage.
  • No requirement for roof ventilation and condensation within the roof is avoided as the structure is maintained at the internal temperature.
  • CE marked in accordance with harmonized European standard EN 13165.

General information





Polyisocyanurate (PIR)

Polyisocyanurate (PIR).




Other sizes available on request.

1200 mm


Other sizes available on request.

600 mm


30 mm

40 mm

50 mm

60 mm

70 mm

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Pr_25_71_63_66 Polyisocyanurate (PIR) foam boardsPrimary


J41/10 Reinforced bitumen membrane warm deck roof covering

J41/420 Rigid urethane foam insulation

Specification data - Polyisocyanurate (PIR) foam boards


To BS EN 13165.

Third-party certification

BBA certification.

Fire performance

Reaction to fire (product as such) - EN 13501-1 - Euroclass F.

The following system achieved a classification of BROOF(t4) in accordance with BS EN 13501-5 : 2005 and so is unrestricted by the national Building Regulations: an adhesively fixed system comprising an 18 mm plywood deck, a 2.0 mm polyester-reinforced foil IKO Systems SA VCL, a 150 mm thick insulation board, a torched-on SBS Standard Underlayer finished with a torched-on SBS Goldseal T/O cap sheet.

Thermal conductivity (maximum)

0.024 W/mK (≥120 mm), 0.025 W/mK (80 – 119 mm), 0.026 W/mK (≤79 mm).

Compressive strength at 10% deformation

Exceeds 150 kPa at yield.

Suitable for loads associated with maintenance traffic. For heavier traffic, extra precautions should be taken (consult the waterproofing manufacturer for appropriate details). Care must be taken to avoid damage to boards by impact or concentrated loads during installation.

Face size (length x width)

(Other sizes available on request).

1200 x 600 mm.


± 30 kg/m³.


Bituminous coated glass fleece on both sides.



Environmental information

Country of product manufacture

United Kingdom


Recticel Insulation Flat Roof Specification Guide V1.5

Recticel Insulation Flat Roof Specification Guide V1.5

Recticel Insulation Product Guide

Recticel Insulation Product Guide

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