Icopal Thermazone Roof Insulation Boards for Flat Roofs

Thermazone TorchTop Roof Insulation Boards

Thermazone TorchTop insulation board is suitable for use with Icopal Profiles and Total Torch waterproofing systems. It is suitable for use over all types of structural deck and must always be laid over a suitable vapour control layer.

Features & Benefits

  • Excellent thermal performance.
  • Dimensional stability.
  • High compressive strength.
  • Resistance to mould and microbial growth.
  • Resistant to most oils, greases and adhesives (except those containing ketones and esters).
  • Easy to handle, cut and install

Insulation Board Core & Facings

The Core: Thermazone Torch Top insulation board  is manufactured from a high performance CFC/HCFC– free polyisocyanurate (PIR) based formulation with a typical density of 32 kg/m3.

Thermazone Torch Top insulation board is manufactured without the use of CFCs/HCFCs and has zero Ozone Depletion Potential (ODP).

Insulation Board Facings: Thermazone Torch Top insulation board is faced on the upper surface with an autohesively bonded, 15mm thick perlite board, manufactured from expanded, milled, volcanic perlite rock particles formed into a board and treated during manufacture with a bitumen emulsion and finished on its upper surface with a thermofusible film.

The underside of the insulation core is faced with a perforated glass reinforced cellulose facing autohesively bonded to the insulation during manufacture.

Technical Details

Flat Board


Board Size  1200mm x 600mm
Perlite Conductivity (l-value) 0.055 W/m.K
PIR Conductivity (l-value) 0.027 W/m.K (<80mm);
0.026 W/m.K (>=80mm<120)
Thickness /mm 40, 65, 80, 105


Tapered Board


Board Size  1200mm x 1200mm
Thickness 25-45mm; 45-65mm; 65-85mm; 85-105mm

Jumper/Packer Board  


Board Size  1200mm x 1200mm
Thickness 80mm

Insulation Board Attachment

The insulation boards are bonded to the vapour control layer in accordance with the manufacturer’s recommendations and are dependent upon the waterproofing system specified.

When Thermazone TorchTop insulation is used over metal decks attention must be paid to the requirement of the insulation board to comply with the minimum thicknesses shown in the table below.


Trough Width (mm)  Minimum Board Thickness (mm)
< 75 25
76 - 100 30
101 - 125 35
126 - 150 40
151 - 175 45
176 - 200 50


Contact Icopal 0161 8654444

Find Local Support

To discuss your project in more detail please contact
Your Local Area Manager


Technical Support


0330 123 4585

Email: technical.uk@bmigroup.com


Sales Enquiries & Orders


0843 224 7400


0843 224 7401

Email: sales.admin@bmigroup.com

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